I am going to be helping Braveheart61 diagnose one of his 850i's over the weekend (1991). As it says in the title it starts, idles for a second, then dies. The plan is to go through it as follows:
- Stomp test
- Visual inspection of intake / vacuum system for leaks
- Fuses
- Unplug MAFs and see if it goes into limp home mode (though now that I think about it, those don't usually go out at the same time do they?)
- Camshaft position sensors
Does anything else immediately come to mind for you V12 guys? I drive a lowly V8, so I'm probably 4-short on ideas.
The usual cause of running for a few seconds and then stopping is the lack of cylinder identification signals. These are provided by the inductive sensors on HT leads 6 and 12.
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
fuel pump
Current:
- 09 335i MSport, FBO.
- 98 Euro M3, Estoril Blue
- 04 M3, Carbon Black, 6 Speed Coupe
- 06 M5, Black on Black, Full Leather.
- 73 3.0CS, Tagia Green, 5 speed M30b35 converted
Ex's: 1984 325e, 1988 325IX, 1992 525I, 1995 540i/6, 2002 330i, 2005 330xi, 1992 850i, 2003 330i #1, 2003 330i #2, 2002 330ci, 2004 330ci, 2007 328CI, 2007 335i, 2001 M3, 2006 M5 6 speed
Fuel Pressure Regulator!!
I will swap the leads off his parts car and see if it makes a difference, thanks for the info.
Need to know which relay to bridge for this and where it's located.
Will check.
Sure, I'll run the red exhaust tip idea up the flagpole while I'm there.
- - - Updated - - -
Update; INPA stored errors:
Ti-signal 7-12th cyl
Throttle valve servo motor 1-6th cyl
Any ideas what the ti signal is? I assume throttle servo is idle control.
ti-signal is the injection time signal, the base timing is derived from the cylinder identification signal.
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
Roger that, thanks Timm
- - - Updated - - -
Replaced throttle body on bank 1-6 with known good one, replaced cyl 12 wire with known good one, no dice.
Is it still running for a second or so and then fizzling out?
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
We had the same problem this weekend on an 850. Exactly as Timm said: lack of cylinder identification signals. In our case the ignition wire boot of cylinder 12 was lose/not connected to the spark plug.
Before we checked the usually subjects like fuel pumps, fuel pressure, ignition = distributors+rotors, crankshaft position sensors.
Shogun tricks and tips for the E32 series are HERE!
Problem solved - bad fuel pump. And the tank was full... Thanks for the help guys!
That's good news!
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
No tea around here, so time for a cup of beer.
Don't you V12 boys have a fuel pump per-cylinder-bank as the 750 boys do?
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
same symptoms I experienced on my 93 850ci. my car went nto lhm then died... car would start then die.. changed my fuel pump assy (passenger side $400+) . car started but still on LHM. stomp test gave me 2247. was thinking it was sensor but trned out to be a bad plug wires (#7 and #9)
daryl
Last edited by chinito03; 11-23-2013 at 07:06 PM.
1993 e31 850ci Diamond Black
1996 Mitsubishi 3000gt VR4 Pearl green
1997 Mitsubishi Pajero LS Intercooler Grey
1993 Nissan z32 300zx Twin Turbo Pearl White
1991 Nissan Sentra GXE (Sedan) Pearl blue
Shogun tricks and tips for the E32 series are HERE!
Damned car has been giving me the kinds of ulcers that only 8 owners can really understand; doing the exact same thing as initial subject, fires, runs for a couple seconds if that then dies.
Thanks to this forum and all of it's threads, I was able to summize that it is quite likely the fuel pumps. Wasn't really looking there as it smells horribly of fuel and I had already replaced them just a couple years ago, good friggen reliability there for sure, NOT,
A special thank you to the forum member who suggested jumping a wire (with car off) from fuse 23 to 30amp fuse 25, then 24 to fuse 25 to see what's what with factory fuel pump wiring and what not. Very helpful diagnosis tool, very helpful indeed, makes perfect sense and a guy's thinking, shit why didn't I think of that; alas, one cannot think when all they want to do is put a stick of dynamite underneath a car and a piece of crap Peake Tool that's........ well,... that's another rant.
Thanks Gents
hi
i need help please
my car 850i manual 1991 run really rough and it die checked the fuel pumps and both working replaced 2 cid sensors 2 crank sensors cap , rotors and spark plugs and i still have the same issue ?
my codes are 16 CAMSHAFT POTION SENSOR for both sides and when ever i clear the codes and start the car the codes come back at ones ?? and the car die ?
sometimes the car start normal like V12 but it start to stall then die and some time passenger side work and drive side shut off and when i turn it off and start it again the problem go to passenger side ?
please i need help
what i am missing here
i order 2 coils still waiting
do i have to order new spark plug wires ?? ecu , dme , wire harness ????
i love the car and i want it back to be normal
please any advice
thanks
ryan
the car is telling you what's wrong, the CID sensors...
You sure you have them plugged into the right plugs?
You sure they are actually any good? Bad "donuts" have been a common problem with some replacements...
Bookmarks