528 e39 enegine roughness pls help no error codes via inpa!!!!!!!!!!!!!!!

[Bmw528e39]

Hi there, thanks a lot for the reply, so u belive that is a vancum leak, i don t know as i have checked it and did not show anyyhing thats why i m thinking for other possibilities i have also changed th o2 sensors with ngk ntk in the intake manifold everything looks solit and good that is why i belive maybe maf sensor as i red somewere that ove 70k miles will be good to change mine has 220k km othewise i think to take everything appart again for visual check thing that i did a month ago, i don t know is it possible anyone to assist via posting resistance values of the maf i ve got 5wk9600

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Document 17.pdf

[dworthy]

The tell tail sign is the engine load numbers. When ever I have seen that maxed out, it is usually a vacuum leak. Go back with your smoke machine and check with 10psi of pressure in the intake. Also connect a vacuum gauge to the intake. Post the numbers at idle, off idle ect. Normally it should be reading steady at idle, when you rev it up to say 1.5k it should drop slightly but remain steady. If it is bouncing around or way low, there can show other issues.

[Bmw528e39]

ok guys back again
performed smoke test again, no leaks
tested fpr as per last entry all good steady at 3.5 bars while engine revs 1500 rpm
once again removed everything
changed all tubes (T) of purge valve coming from intake, fpr hose from intake pcv is new, but after market, o2 new ngk ntk, cam sensor,cps new, all washers of the valve cover and gaskets including the once under on the spark plucks as well new
inspect everything else all good
still 13kg air 100 plus mp engine load and high fuel trims
maf sensor resistance
1-4pins 0.08ohmsa
2-1 and 2-4 18.2kohms
pin 3-1,2,4 could not measure as my multimeter does not have m ohms and should be 5.56
icv
1-2pins comes up with 13.6ohms
2-3 results 12.5
1-3 pins results 24.3ohms
second test of icv connected turn ignition in position 2 sounds the zzzzzzz proof that it works and opens aa bit more than half i think should be half, when turn off the ignition is closing and opens just a little bit,

please let me know your thoughts

[dworthy]

I am still at loss, there has to be a leak. Any reading from a vacuum gauge yet? I would still be interesting to see where it is at for Idle and off idle say 2k.

[Bmw528e39]

hi there
thank you very much for your reply what do you mean ( where it is at for Idle and off idle say 2k.) 2k what

[bmwdirtracer]

That means he wants to know how much manifold vacuum you have at idle, and at 2000 rpm.

[Bmw528e39]

thanks a lot Chris could you pls advice how can i do that? were and how to connect the gauge as at all ports intake is pulling air ant not pushing.
pls advice

[dworthy]

I like to use the line that goes into the FPR, normally with any vacuum gauge kit it will come with tubing and a "T".

[Bmw528e39]

ok, thanks a lot chris i will check it and i will post results thank you very much

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One more question is it a special gauge which messure pulled air or an ordinary pressure gauge as the ordinary i have with t connection.

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i mean the results should be minust?

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http://www.ebay.com/itm/Actron-Mecha..._Tools&vxp=mtr

i mean something like this? and i should get minust readings? or the ordinary classic one which is just plus should be ok?

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also checked pin 3 to 1,2,4 pins resistance and i get 1.9 m ohms(i think should be 5.56 m ohms, correct me if i m wrong) on coils the 2 outlet pins 1 ohm should n t be between 4 and 7???
ok might be 2 different issues coils for engine roughness and maf or vacuum for the loads.

[Bmw528e39]

hi and sorry for the late reply i was just waiting to receive my gauge from ebay i finally boght that 1
http://www.ebay.com/itm/371152904744...%3AMEBIDX%3AIT
results:
car at idle about 750 rpm vac 47/50 cm hg
at 2/2.500 rpm 50
or:
on idle 19 hg
2/2.500 rpm 20 hg

pls let me know your thoghts
at all times steady not moving only when increase or decrease the rpm moves backwards instantly but not slow then gets back to what i wrote

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i also have this error


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[dworthy]

Vacuum looks normal, was looking to see if the needle bounced at idle or dropped to nothing when it is reved up.

Cannot see the photos, please re-post them.

[Bmw528e39]

No at idle is teady at the numbers i have post not moving at all (this 100 % sure)
when reved up if i remeber well it drops between 10 and 15 hg fast not slowand when gets back to idle normal 19,20 hg ( but this i will need to double check 2day )

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No at idle is steady at the numbers i have post not moving at all (this 100 % sure)
when reved up if i remeber well it drops between 10 and 15 hg fast not slowand when gets back to idle normal 19,20 hg ( but this i will need to double check 2day )

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Hi
ok just double checked
at idle is steady at 19,20 hg
when reved up it drupes to 0 then when leave the throtle and gets to idle back to 19,20 hg

[dworthy]

At 2k, you should be seeing 10 HG, there has to be a some vacuum pressure left in the manifold. Next I would look at your brake booster, how many times can you pump it before loosing power assist?

[dworthy]

Also as a after though, get an exhaust back pressure completed, your cat or other part of your exhaust maybe clogged.

[Bmw528e39]

Hi there thanksa lot for your replies the thing is that i have changed the intake manifoldboot(the 1 between the throttle and the maf) as is an old and hard just installa new one and when i pump 2,3 times and keep the pedal pressed the rpm drops almost650, were i believe it should be
btw sometimes the break light comes up after a few kms goes away, alsosometimes gives error check break linings
today i will check again the vacuum pressure by closing the break hose on theintake with my finger and i will post
by the way there is not another way to check if the exhaust if is clocked? imean diy


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Please check this link http://www.youtube.com/watch?v=d-jp1IIJVVk‏
you are saying that in 2k i should see 10
or is bmw diferent
please advice

[dworthy]

Between 2-3k you should see about the same or at a minimum 18 hg. If it is less than that, I would look at getting a back pressure check.

[Bmw528e39]

Hi yes double checked again is the same at 2.5k is 20 same as idle kept it at 2.5k for like 20 seconds still 20 hg needle does n t drop so i guess no vacuum leak and exhaust, cat looks ok so what else could cost this readings in inpa and the car to run lean? please help as this issue drives me crazy i could sort out so many issues on this car fast and this i m hunting it for so long and nothing.

[Bmw528e39]

any updates?

[dworthy]

Other lean running issues can be cause by injectors sticking or oxygen sensors slow to re-act.

[Bmw528e39]

thanks a lot for your reply
ok if sticky injectors, how can i check?
oxygen sensors both new ngk. could be possible aas there no Siemens? in inpa the voltage it change every second between 0.1 up to 5 volts
couldn t be the maf sensor as between pin 3 and 1,2,4 i have red somewhere that it should be 5.56 mohms and i ve got only 1.9 mohms
i have the 5wk9600 if any1 could help me by measuring his maf.............
waiting for your feedabcks

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another thing is that i don t think could be the injectors as when engine is cold i get misfire on cylinder 1 and 4 and minimum at 6 when worm 1,4,6 ok aand all the rest but at all times is changing
let pls know your thoughts

[dworthy]

I cannot think of anything else it can be, as you have already tested the coils and they were good.

[Bmw528e39]

ok but here we might talk for 2 diferent issues
one the missfire, engine roughness
second that the engine uses more air than what it should
i want to focus to the air, mixture actually
so next i think to do is remove injectors clean and rebuild them
also about the coils how can i test them by resistance? do resistance between pins 1 and 3 can tell if they are good, if i remeber well they were like under 1 ohm but i will check again when i get home and i will post

[dworthy]

Yes, test the coils between the outer two connectors. IIRC it is 1 and 15. They should be .4 to .8 ohms, anything outside of that means they are bad.

[Bmw528e39]

hi there is between 1 and 1.5 ohms
so i guess i will have to replace them
what do u think, if that s the case will the readings in inpa get back to normal i men engine load feul trims and air use in icv?
i will also do injectors rebuild (hat, micro basket filter, o rings and professional cleaning)
and which coils you suggest, if not bosch or bremi?
BERU B3-ZS302
ERA ERA880045
HÜCO HC133804
MOBILETROn MBCE89

MEAT&DORIA-HOFFER MED8010454

[dworthy]

Bosch or Bremi are both OEM coils. Just make sure you get all of the same and don't mix. I have used both in M5x motor, and cannot say if one was better than the other. Best to just grab some out of a junk yard, tested of course, slap them in and see what changes.