E32 750IL only 1-6 cylinder running and smoking badly

[rizal.harsa]

Hello, im rizal from indonesia, anyone can help me to fixed my e32 750IL prod date 1990-05-11

When i bought this e32 the condition was smoking badly and cannot rev above 3000 rpm

What my mechanic do :
1. Change distributor cap
2. Clean the injector

Result :
1. Still smoking badly
2. Engine more stable and smooth
3. Cannot rev more than 3000rpm
4. Cluster information display suddenly off darkmode
5. Only 1-6 cylinder running (scan result)
6. Right throttle cannot open

And then i read your article about e32
And i done this thing :

Step 1
1. Buy a new pvc or crankcase ventilation and replace the old pvc
2. Clean DK throttle

Result :
1. Smoking is gone or not much
2. Cannot rev more than 3500rpm
3. Right throttle now can move when the ignition on.. but still cannot open when engine is running
3. Still running on 1-6 cylinder


Step 2
1. Change cluster, i find new fact that my e32 use a cluster for 735 so i borrow my friend cluster 750 in good and working condition all lights on
2. Also Change EML module

Result :
1. Can rev up to 4500rpm
2. But now smoking again
3. The cluster eml light information light all off
4. Still running in 1-6 cylinder and right throttle cannot open when engine running

Do you have any idea what should i do?

If you dont mind You can also reply to my email : rizal.harsatanaya@gmail.com

Thanks for your attention and help

[shogun]

Hi Rizal, first of all check both crankshaft position sensors and the 2 cylinder identification sensors on cyl. 6 and 12 https://www.bimmerforums.com/forum/s...&highlight=cps
Are both fuel pumps running and have enough pressure? To test, use a wire and hold it onto B+ pole in engine bay left side, engine off, then touch briefly fuse 23 and then fue 24 in the fuse box, you should then hear the fuel pump run
wiring diagrams are here http://shark.armchair.mb.ca/~dave/BMW/e32/
did you change both distributors and rotors? You mention only one. Check if sparks are coming on both sides, especially on cylinder 6 and 12.

you mention:
The cluster eml light information light all off
Still running in 1-6 cylinder and right throttle cannot open when engine running

check the wiring to the cluster, the cluster must work properly, otherwise the engine will run in limp mode. It could be a wiring problem to the cluster, you need the cluster working so that the EML light goes briefly on and then disaappears. Without EML light at all, then engine will always run in limpmode

example http://www.bimmerboard.com/forums/posts/644209/

[rizal.harsa]

@shogun i check the fuse for cluster, and fuse no 20 is off and after i change the fuse now the cluster in working condition, but the eml light always on
And the car i think still on limp mode.
What should i do now?

[shogun]

did you change both distributors and rotors?
If so, then check the crankshaft position sensors and the cylinder identification sensors. see above link. Using digital multimeter, check resistance between terminals 1 and 2 in crankshaft position/rpm sensor connector.
Crankshaft Position/rpm Sensor Specifications Coil resistance (approx.) @ 20°C . . . . . . 540 ± 10% Ω , Air gap (sensor distance from toothed wheel) . . . . . . . 1.0 ± 0.3 mm (0.04 ± 0.01 in.)

https://wiki.bentleypublishers.com/d...=1306522675840

Check if both fuel pumps are running: open the fuse box left side engine bay, use a short cable, engine/ignition off, touch the large B+ post there and with the other side briefly touch fuse 23, then 24, then should each fuel pump running for a moment. Before that squeeze both fuel hoses coming up there and connect to the engine, after testing, squeeze the 2 fuel hoses again and see if they have more pressure, that would be a good sign that both fuel pumps run.

You can also swop the ignition coil from one side to the other, same step by step with the MAF, if the fault goes to the other side, then you know which part is defective. Also the Motronic 1 and 2 in the e-box right side engine bay you could swop for a test from one side to the other. The location of DME I and DME II is shown in the wiring diagrams I posted above, scroll almost to the end, there are component location views, do not mix up with the EML control unit.
Testing the ignition coils and ignition wires I have posted in this thread https://www.bimmerforums.com/forum/s...and-M73-engine
What color is the smoke from exhaust?

White smoke: This smoke is created when the engine is burning excessive amounts of coolant or water. This smoke can be created by condensation in the internal areas of the motor or if there is a leak where the coolant is entering the piston. The white smoke may also be due to the leakage of anti-freeze or transmission fluid. Remedy: Check for any leakage in coolant or transmission fluid and ensure that all fluid levels are at their recommended optimum.

Black smoke: This occurs when the combustion of the fuel is not burnt completely. In other words there was too much fuel and it continued burning into the exhaust side of the engine. This is why black smoke is emitted with a powerful fuel odor. Or there is no spark/ignition

Blue smoke: This is created when oil is burned in the cylinder that occurs generally when the engine is idling or running at high speeds. Oil can leak from many sources and when it reaches the cylinders it is burned off during the combustion stroke of the motor. The oil smoke carries a telltale odor.

other items to check https://www.bimmerforums.com/forum/s...power+ultimate
good tech info also on this site for the M70 http://bmwe32.masscom.net/
So you have a lot of work to do now for testing, please reply as detailed as possible after that testing, so that we can then try to help more.

[shogun]

Got a PM from rizal.harsa , here copied, better all can read and help, M70 experts to the front, thanks:
quote
Thanks for your help. I just scanned my e32 using GT 1 and the result is :

Diagnosis DME Fault survey :
Cylinder 1.....6
43 idle CO potentiometer
Troubleshooting by means of perceptible symptoms

And :
5 tank venting valve,
16 fuel injectors: Cylinder 1 3 5
17 fuel injectors: Cylinder 2 4 6
23 relay , oxygen sensor heater

May be you have a clue for the error, thanks
unquote

my comment, maybe the people using a scanner can offer more help:

idle potentiometer could be the throttle valve? Did you clean the throttle valve already and test them?
tank venting valves are going from each throttle valve to the front of the engine and then near washwater tank to the charcoal filter. See here http://bmwfans.info/parts-catalog/E3...ration_system/
both must be connected with a electrical plug, usually the old hoses are cracked and then uncontrolled air is sucked into the engine thru the throttle valves, because the MAF is before the throttle valve.
fuel injectors on bank 1 = passenger side, check the connections of the wiring if they get power. Looks like they do not get any power at all. Swop the Motronic DME relays , see drawing in wiring diagrams.
23 relay oxygen sensor heater: can be solved later, that is only to heat up the catalysator oxygen sensor
throttle body cleaning http://bmwe32.masscom.net/moswald/75...ies/index.html
fuel pump relay and DME location http://bmwe32.masscom.net/sean750/fu...t/Fuelpump.htm
important remark added by Sean: the location of the fuel pump relays can differ from model to model when it comes to the relay box near the right strut tower. At the picture above you see the orange relays. That are my fuel pump relays. Later models can have the fuel pump relays at the rightmost position. In that case they are usually black and have 'fuel pump relay' stamped into the surface (well, in German language obviously). Make sure which relays are your fuel pumps relays (check by pulling pump fuses and measure voltage at terminals) and which are the main relays. My main relays are the white ones, later models have them in the center. This means the Bentley Book is showing the correct position of the relays for most models (but not all). The blue relay is the lambda sensors heating relay.

Here you have all relays by built year http://www.e32-schrauber.de/bmw/s-relaisbelegung.htm
here location of K210,211,212,213, 214, X6400 , fuel pump relays, DME relays etc http://www.e32-schrauber.de/bmw/date...8_88-07_94.pdf

In case the Motronic is the M1.7 with Bosch end no. -352, here is something from the TIS with regards to faults:
Fault codeDecimal code Fault location/type
01 M1.7 (M70), M1.7.1: TR signal/ EKP relay
03 M1.7 (M70), M1.7.1: Fuel injectors, cylinders 2+4+6 and 8+10+12
08 Warning lamp (only US)
16 Only M1.7 (M70), M1.7.1: Ignition
32 M1.7 (M70), M1.7.1: Fuel injectors, cylinders 1+3+5 and 7+9+11
36 Tank vent valve
37 Oxygen sensor heater relay
41 Air mass flow sensor
54 Control unit power supply
64 Ignition timing intervention
70 Oxygen sensor
73 Speed signal
76 Idle speed CO potentiometer
77 Intake air temperature sensor
78 Coolant temperature sensor (engine)
82 Only M1.7 (M70), M1.7.1: Engine drag torque control intervention (MSR)
83 Only M1.7 (M70), M1.7.1: Automatic stability control intervention (ASC)
100 Output stage
201 Oxygen sensor emissions control
333 M1.7 (M40, M42, M70), M1.7.1: DME control unit

[rizal.harsa]

A week ago i cleaned the throttle body (the right side) and follow masscom instruction and after i cleaned it the throttle is moving when the ignition on (both throttle moving) but when the engine is on and i pushed the accelerator pedal only the left throttle moving, the right throttle not moving at all. So the right throttle still need to be repair or not?

Fuel relays

When i pulled out the fuel relay K210 (cyl 1-6) i still can turn on the engine but when i pulled out the relay k211 i cannot turn on the engine. Then i tried to swop the fuel relay K210 for K211 and let the k210 without relay, i still can turn on the engine
What do you think about this case?

I Swop the Motronic 1 and 2 and also the MAF but the fault not goes to the other side

The exhaust smoke color is blue

Tomorrow i will check the distributor and rotors
a week ago i replaced the distributor both side but with used part

[tsmcg161]

I just replaced an engine because of blue smoke. I would pull all the plugs to check for oil foul. I would also disconnect the battery to reset electronics systems.

[shogun]

A week ago i cleaned the throttle body (the right side) and follow masscom instruction and after i cleaned it the throttle is moving when the ignition on (both throttle moving) but when the engine is on and i pushed the accelerator pedal only the left throttle moving, the right throttle not moving at all. So the right throttle still need to be repair or not?

Fuel relays: When i pulled out the fuel relay K210 (cyl 1-6) i still can turn on the engine but when i pulled out the relay k211 i cannot turn on the engine. Then i tried to swop the fuel relay K210 for K211 and let the k210 without relay, i still can turn on the engine

Clean up the throttle body of both sides.
To eliminate a fault of the fuel pump relays, you could jumper them, see here, position might be different on your built year, see the comments in this link http://bmwe32.masscom.net/sean750/fu...t/Fuelpump.htm
Test the fuel pumps as I described before.
Also swap the DME relays next to the fuel pumps.

[rizal.harsa]

Thanks shogun for helping me to find out the problem

Today i swop the throttle body, but the problem still the same.. so i think its not about the throttle body problem .. because the right throttle now can be working when i moved it to the left side.

Is it possible if the problem came from a lose cable of the connectors on the throttle valves or broken cables ? How to test the broken cable connectors?

And how about accelerators pedal sensor? Is it possible causing the problem?

About the fuel pump, i think both fuel pump still in working condition, because when i removed the fuel hose the fuel came out from both hose

tomorrow i will clean both throttle body Just make sure

[shogun]

It could be a broken cable somewhere, above I gave you the wiring diagrams and that includes the wires between the EML control unit in the e-box and then throttle bodies/valves.
There in the ETM is a diagram which shows you the pinout of the EML module. Here is another link which shows you the function diagram of the EML unit, the EML unit has 55 pins https://www.europeantransmissions.co...MW/EML-BMW.pdf
Here I posted all the pins of the EML https://www.bimmerforums.com/forum/s...frence-pin-out
example of broken wires from e-box to throttle bodies http://www.bimmerboard.com/forums/posts/644209/

Accelerator I do assume that is no problem, but you can test it, see also the Bentley Repair Manual which you have, it is all in there, spend some hours time for reading in it for EML testing etc.

from my website under reference data throttle body details, you can test that, DK input details : small PDF file http://twrite.org/shogunnew/menu/datatop.html
But here are the details
Bentley Repair Manual says:


Throttle position actuator check:
Pin 8 and ground 0 ohm (approx)
Pin 7 and 8 5.0 VDC (approx).
Pin 2 and 9 (M30 engine only): 5.0 VDC (approx)

If test fails check wiring and connectors. Turn ignition off. Disconnect air intake boot from EML throttle housing. Disconnect harness connector from EML actuator and remove 4 bolts and remove EML throttle housing assy.

"Play" (tolerance) between throttle pedal and the stopper underneath 3 mm.

EML connector pedal position test pin:
M70 Motor (DME 1.2) brown/violett pin 1
M70 Motor (DME 1.7) blue/brown pin 20

pedal at idle position..............0.34-0.43 VDC
automatic transmission:......... 0.35-0.45 VDC

Pedal at full throttle:
automatic transmission: 3.7-3.8 VDC
http://www.bimmerboard.com/forums/posts/565036/

also read this complete thread, limp mode M70 http://www.bimmerboard.com/forums/posts/415901

Did you meanwhile check the crankshaft position sensors and the cylinder identification sensor and the other items I listed above?

[rizal.harsa]

i checked the crankshaft position sensor by disconnecting CPS on right bank and the engine still can be running, but when i disconnecting CPS on left bank the engine wont start or running but im not checking using digital voltmeter, i will do that tomorrow

sorry shogun for asking this question, im trying to read and learn all your instruction, because lack of knowledge about electrical thing i confused how to do this :

Throttle position actuator check:
Pin 8 and ground 0 ohm (approx)
Pin 7 and 8 5.0 VDC (approx).
Pin 2 and 9 (M30 engine only): 5.0 VDC (approx)

do you have an actual pic of the the pic 7 and 8 location? is it on eml unit or on throttle?



Measure DK voltages
When turning the key to position 2 - before engine start - measured with DK disconnected
7-12 (the good side) receives 12v to pin3 and 6 v to pin 5. then both pins go to zero
6-12 (the bad side) receives 7.2v to pin3 and 4.2v to pin5. These values remain.
The only differences between the throttles are on pins 3 and 5. All the other pins give matching readings.
SO wiring looks good on 6-12 bank -- Power is being delivered -- maybe plug
OR problem is with DK output circuit of EML

where's the location of PIN 3 and 5 ?

EML connector pedal position test pin:
M70 Motor (DME 1.2) brown/violett pin 1
M70 Motor (DME 1.7) blue/brown pin 20

is it PIN no 1 on EML Unit?

[shogun]

That is the most important, without CPS the bank will not start. Test the two CPS for ohm as I described before : Crankshaft Position/rpm Sensor Specifications Coil resistance (approx.) @ 20°C . . . . . . 540 ± 10% Ω , Air gap (sensor distance from toothed wheel) . . . . . . . 1.0 ± 0.3 mm (0.04 ± 0.01 in.) ,see the link to Bentley repair manual details for CPS testing in my post # 4.

I am also not very good with electr. stuff, so I hope more experienced members will chime in. Here is what I can tell you what I know or what I assume:
As for the different measurements of the 2 throttle valves someone with experience has to chime in. But on the throttle valve you can see the pin numbers, I just checked on my car. When you remove the wire loom plug from the throttle valve, you can see on the throttle valve the female connectors embedded in a brown plastic, on the outer circle of that plastic all the pin numbers are embossed, use a magnifying glass then you can see it better. Here on the last picture you can see the numbers
http://bmwe32.masscom.net/moswald/75...ies/index.html

"where's the location of PIN 3 and 5 ? EML connector pedal position test pin: M70 Motor (DME 1.2) brown/violett pin 1, M70 Motor (DME 1.7) blue/brown pin 20. is it PIN no 1 on EML Unit?
Here I am not sure, on the older M1.2 DME with total 55 pins pin 1 ignition pulse , see here under 750 iL pinout information https://www.europeantransmissions.co...MWtechinfo.htm
and here more in detail on my site http://twrite.org/shogunnew/data/electrical.html
In case your car has the newer DME M1.7 with Bosch end number -352 and the pins are 88, see the wiring diagram or the Bentley repair manual page 130-61 ECM pin assignments DME M1.7
the plug on top of the EML control module has a cover which can be removed, then you have access to the pins with the plug installed on the EML unit.
The EML control unit has these pins, German language, use google translate: Der Anschlussstecker EML hat die Bezeichnung X6004.
Steckerbelegung = pinout
Pin 1 EML Pedalwertgeber = EML pedal potentiometer value
Pin 2 EML Pedalwertgeber = EML pedal potentiometer value
Pin 3 frei
Pin 4 ABS/ASC/ASC+T Steuergerät
Pin 5 DME Steuergerät 1
Pin 6 EML Pedalwertgeber / DME Steuergerät 1
Pin 7 EML Pedalwertgeber
Pin 8 Instrumentenkombi
Pin 9 EML Pedalwertgeber
Pin 10 EML Stellmotor 2
Pin 11 EML Stellmotor 2
Pin 12 EML Stellmotor 1
Pin 13 RXD Datenleitung
Pin 14 Masse
Pin 15 EML Leuchte Instrumentenkombi
Pin 16 EML Stellmotor 2
Pin 17 EML Stellmotor 1
Pin 18 Hauptrelais 2
Pin 19 Masse
Pin 20 EGS Steuergerät / EGS automatic transmission control unit
Pin 21 frei
Pin 22 Steuergerät ABS/ASC/ASC+T
Pin 23 Steuergerät ABS/ASC/ASC+T
Pin 24 frei
Pin 25 frei
Pin 26 EML Stellmotor 1
Pin 27 EML Stellmotor 1
Pin 28 EML Stellmotor 2
Pin 29 frei
Pin 30 Masse
Pin 31 Kühlwassertemperaturfühler
Pin 32 EML Pedalwertgeber/DME Steuergerät 2
Pin 33 DME Steuergerät 2
Pin 34 EML Stellmotor 2
Pin 35 EML Stellmotor 1
Pin 36 Hauptrelais 2
Pin 37 Hauptrelais 2
Pin 38 EML Stellmotor 1
Pin 39 frei
Pin 40 EML Stellmotor 2
Pin 41 Klimaanlagenrelais
Pin 42 Getriebewählschalter
Pin 43 Schalter Geschwindigkeitsregelung
Pin 44 Steuergerät Lock Sensor
Pin 45 Kühlwassertemperaturfühler
Pin 46 EML Pedalwertgeber
Pin 47 DME Steuergerät 1
Pin 48 frei
Pin 49 DME Steuergerät 1
Pin 50 DME Steuergerät 2
Pin 51 frei
Pin 52 EGS Steuergerät
Pin 53 ABS/ASC/ASC+T Steuergerät
Pin 54 frei
Pin 55 TXD Datenleitung

check once more in your Bentley repair manual which you have, that should be explained there.

You mentioned that the EML control unit might be defective, I just remember this case and he solved the problem with a new used EML control unit I sent him from Japan https://www.bimmerforums.com/forum/s...l+unit+shipped
of course, one of the possible causes, you have to check more.

[rizal.harsa]

@shogun todays update
1. Clean up both Throttle body
2. Checked fuel pump by put a wire from b+ to fuse 23 and 24 and all pumps working
3. Measured DK voltage and the result i think its good.. because both pins go to zero after receiving volt but i torgot the number (pin 3 is bigger volt than pin 5 )
4. Measured CPS terminal resistance but both cps shown different number : 550 and 1500 ohm (is it bad CPS??)
5 reset ECU by disconnecting the battery and connecting + -
6. EML light still on and engine limp mode

May be you have opinion for todays update

[tsmcg161]

Is that 1500 ohm reading on bank 1-6? If it is, replace it. 1500 ohms is too high. You can swap the CPS'S and see if your problem moves to bank #2

[shogun]

1500 ohm is completely out of tolerance. Check once more to double check to make sure that you did not mix up the pins, here is a drwg of the connector with the 3 pins http://www.e32-schrauber.de/bmw/date...or_Stecker.png
here the positions of the 2 CPS, for bank 1 and bank 2 http://www.e32-schrauber.de/bmw/date...Sensor_M70.png
check resistance between terminals 1 + 2 in crankshaft position connector. Crankshaft Position Sensor Specs: Coil resistance (approx.) @ 20°C . . . . . . 540 ± 10% Ω , Air gap (sensor distance from toothed wheel) . . . . . . . 1.0 ± 0.3 mm (0.04 ± 0.01 in.)
An infinitely large resistance is measured between PIN 3 and 1 or 2.

old p/n 12141720307
new p/n 12141720291 original BMW https://www.fcpeuro.com/products/bmw...si-12141720291
autohausaz has Facet aftermarket CPS for $32.79 , Facet Crankshaft Position Sensor P/N: 12141720291 Facet Cross References: 12141720307 90057 , BMW 750iL, 850Ci, 850CSi https://www.autohausaz.com/pn/FC-12141720291
Schmiedmann has Vemo : V20-72-0422 for EURO 51, they also ship worldwide https://www.schmiedmann.com/en/produ...ct=12141720291
cheapest one in AliExpress China for $15.80 incl. shipping https://www.aliexpress.com/item/4000148094995.html
but as the CPS is very important I personally would by original BMW

[rizal.harsa]

@tsmcg16 and shogun
Which one is the right diagram for cps and cis ? Because i see two version of it :

https://wiki.bentleypublishers.com/d...=1306522675840

And This version

https://www.bimmerforums.com/forum/a...5&d=1367940683

I will check the cps once more tomorrow

[tsmcg161]

Neither one are correct. The CPS in the blue square, bank 2 should plug into red square on the plug cluster. The CPS in the red square, bank 1 should plug into the blue square on the plug cluster. The CIS purple and green are correct.

- - - Updated - - -

What I described above is how my 12/88 750il is.

[shogun]

take these pics, also there is a pic from the workshop manual, that is very clear
https://www.bimmerforums.com/forum/s...6#post27839606
here we discussed the location of the 2 CPS with pics , Crank and Cylinder Index Sensors M70 https://www.bimmerforums.com/forum/s...&highlight=CPS

Both CPS sensors have the same part number and same design, but the installation location on the crankshaft is different, so you will see on top where the plugs are which one goes where by length too.

[rizal.harsa]

@shogun :
I removed the CPS and and found a bad plug see pic below

https://ibb.co/9H5KZhB

This is the cps with 1200 ohm

[shogun]

Very good find, that is completely ripped apart.Most probably you found the problem, get a new one, and install it, then report back. In case original BMW CPS 12141720291 is too expensive for you or difficult to get locally, try Facet 9.0057 or Vemo V20-72-0422
That p/n is only used on E32 M70 and E31 M70 and S70, maybe you find one in the online auction shops, best is to buy 2 of them, so you have 1 spare. As a temporary solution you could try to solder the pieces together, not sure if that will work.
Till the parts arrive, you can make more testing, for example all 12 ignition wires. spark plug ends 5.0+/- 10% kohm, shielded plugs 1.0 +/- 20% kohm, spark plug wires 0 ohm (approx.), rotor 1.1 +/- 10% kohm
so in total from end to end 6 kohm +/-...

In case you need new ignition wires for M70 / S70 , I have stock in Japan and can send to Indonesia.

[tsmcg161]

Happiness is a V12 that fires on all 12 cylinders. Good find!

[rizal.harsa]

i will look for facet crankshaft sensor, hope that will solve my problem
thanks shogun and tsmcg161, will update after i got the facet

[rizal.harsa]

Hello
finally i got 2 pcs brand new CPS original from BMW, but after install it the problem still remain
the EML light still lights on and car still on limp mode
any suggestion or what else should i check?

[shogun]

Do you still have access to the GT1 scanner for another fault code test?

[rizal.harsa]

i check the ignition coil on LHS Bank and its broken, i swop the ignition coil with RHS bank (good coil) but nothing happened, engine cannot running LHS bank completely off.
and i swop the the DME
I pull out the DME 2, engine can start only with DME 1
DME 2 the bad one, i swop it to the DME1 (Slot DME 2 emty) engine cannot running (i think DME 2 is broken)
DME 1 (good one) i swop to DME 2 (Slot DME 1 emty) engine cannot running i think DME 2 have a bad plug wiring)

when (ignition on position) i used voltmeter to check the pin out plug on DME 1 the result is :
pin number : 1,6,13,18,27,32,36,42 (have pulse)

DME 2 result :
pin number : 1,13,18,27,32,36,42 (have pulse) and pin 6 have no reaction (is it bad wiring?)

im not checking the ECU plug on EML 55 pin

any idea?