OBD1 E36 running rough / rich; no CEL - Bimmerfest - BMW Forums



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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 02-12-2018, 06:08 PM
zainathan zainathan is offline
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Mein Auto: 1995 BMW 325i M50
OBD1 E36 running rough / rich; no CEL

Bought a VERY rought e36 a while ago and had it running decent for a bit until an injector lost its cap/oring and i decided to get all new injectors, as id had injector issues earlier on.

Got the car back together and it starts and runs, but idles rough and spits a little gas out of the exhaust. Im not using a battery rated for this car (battery out of a 2.2 2000 camry) and was wondering if that could be the issue? Or if anyone has any other suggestions im very open, but basically out of money.

thanks!!

1995 BMW 325i Sedan (E36) Manual Trans
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  #2  
Old 02-12-2018, 07:48 PM
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hornhospital hornhospital is offline
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Battery will make no difference in running quality unless the alternator isn't working. My guess is the replacement injectors you got are wrong for the car.
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Old 02-12-2018, 08:12 PM
zainathan zainathan is offline
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i forgot to mention that the car begins its idle kind of rough and takes a minute to find a solid idle. Could i be looking at a vacuum leak? would that cause the imbalance thats making the car run rich?
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Old 02-13-2018, 03:24 PM
M-technik-3 M-technik-3 is offline
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How long was the car down for? Gas could be crap. WEre the injectors rebuilt or just used units? Last fuel Filter change?

I would look for a vacuum leak as a start and go from there. How did you know you lost an o ring and a pintle cap?
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Old 02-14-2018, 09:21 PM
zainathan zainathan is offline
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When i pulled the fuel rail, the injector cap/ oring fell into my hands. Im thinking its a vacuum leak of some sort. I recently pulled apart the ICV but it was giving me the same symptoms before pulling the injectors/ icv (obviously was worse pre injector replacement) The injectors are reman. The gas shouldnt be too bad, its been sitting maybe 2-3 months (or could it?) as for the fuel filter im not sure.
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Old 02-15-2018, 11:20 PM
Stallion13 Stallion13 is offline
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Sounds like you may have found the issue but maybe it is worth checking the O2 sensor?
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Old 02-16-2018, 02:06 AM
zainathan zainathan is offline
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i definitely can give it a look. However, I have no CEL. when the injector was bad i got a 1253 (injector 3 bad) so i figure it would throw a 1212 or a 1221 code if the o2 was bad.
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Old 02-16-2018, 03:26 AM
M-technik-3 M-technik-3 is offline
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OBD I is not as sensitive as OBD II. I would continue on the vacuum search.
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Old 02-24-2018, 04:54 PM
anubiz84 anubiz84 is offline
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U have mentioned its getting solid after sometime. If its a vacuum leak idle should go high due to the lean mixture.

Check the O2 sensor relay which is powering the heater element.

If you can replace the O2 sensor that would be better. When you are not receiving (Failed sensor) the signal from O2 sensor ur DME orders a fix mixture (Open loop). So in cold condition idle can be rough due to that rich mixture.

And in my car I had a bad idle due to out of tuned (man made) air flow meter. Check it and adjust if it needs an adjustment. But for this u need a exhaust gas analyzer.

Last edited by anubiz84; 02-24-2018 at 05:12 PM.
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fuel, gas, misfire, rough, running rich


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