318i intermittent idle and acceleration problem - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 06-29-2010, 04:46 AM
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318i intermittent idle and acceleration problem

Hey guys

After fixing my startor motor issue my 94 e36 318i ran perfectly fine up until a few days ago.

So i was driving along and i suddenly lost the power to accelerate, if i pushed the accelerator to the floor the revs did not go up at all, however if i pumped the accelerator 4 or 5 times the revs would go up to about 3000. So i pulled over onto the side of the road and the revs dropped to about 200-300 and fluctuated around there and the car was barely turning over.

However this issue is very intermittent as i can start the car when cold, and drive for a few kms and then have the issue occur. Or i can drive for a 100m and have the issue occur. I can then turn the car off for a few minutes, turn it back on and it will be idling perfectly fine and drive fine but then have the issue occur again a few minutes later if its still cold.

One thing to note is that this only happens when the car is cold, when it warms up it is perfectly fine. Which leads me to believe that it is a sensor of some sort, perhaps the O2 sensor or maybe the MAF sensor. I replaced the fuel filter so it was not a blocked fuel filter.


This video is showing the idle problem and you can hear me pump the accelerator all the way to the floor about 5 times and yet the revs only go up to about 3000. If i don't touch the accelerator then it fluctuates at the very low rpms and eventually just stalls out.

Any help with this issue would be much appreciated.

Thanks guys.
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#2 (permalink) Old 06-29-2010, 09:30 AM
OMFG another one!?
 
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Have you checked/cleaned the MAF (intake airflow sensor)?

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#3 (permalink) Old 06-30-2010, 12:35 AM
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Thanks for the reply

I took a look at the AFM however it looked to be pretty clean anyway. No junk and no build up of carbon in it. Maybe the sensor itself is just faulty? I might clean it anyway just to be on the safe side.

Thanks again
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#4 (permalink) Old 06-30-2010, 09:32 AM
OMFG another one!?
 
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How about the fuel system?

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#5 (permalink) Old 06-30-2010, 11:31 PM
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you might wanna pop the hood at night and look for some arcing from the plug wires. i had a very similar problem and it was just plug wires lol

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#6 (permalink) Old 07-01-2010, 02:04 AM
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I can't say I've checked the fuel system all that much, perhaps i should do that

Alright I'll have a look at the plug wires tonight

I went to the mechanic to get the error codes read, and it spat out error 36: fuel tank evaporation valve and error 70 and 201 which are both o2 sensor related.
He cleared the errors and I'm going back again soon as some of these errors may have been from a long time ago, even though i heard the DME clears the errors after 60 successful starts?
However i think the main culprit from this is the oxygen sensor.
cheers
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#7 (permalink) Old 07-02-2010, 03:36 AM
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once you find out tell us and let us know what was wron

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#8 (permalink) Old 07-02-2010, 11:44 PM
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it turned out to be a faulty o2 sensor
cars running perfectly fine now
thanks for the replys
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#9 (permalink) Old 07-03-2010, 12:01 AM
OMFG another one!?
 
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Sweet that it's sorted!

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#10 (permalink) Old 07-03-2010, 12:05 AM
You Can Has A Custom Title!!
 
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reading the thread the o2 sensor was the first thingi would have looked at. good to know it will remain on the road.

R.I.P fast 6


Two wheels or Four, I'm happy as long as the throttle is pinned.
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