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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

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 12-02-2011, 03:52 PM
floptop318i floptop318i is offline
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Rough idle only in park

97 318IC M44 150k runs great in drive but has a (loping or chugging) rough Idle in park only. I Have cleaned ICV, TB, Injectors, replaced plugs, etc. Any Ideas?
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  #2  
Old 12-02-2011, 03:54 PM
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ZeGerman ZeGerman is online now
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I'd start the process of looking for a vacuum leak.
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Old 12-02-2011, 07:52 PM
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drivinfaster drivinfaster is offline
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^this.

what sort of equipment do you have?? a vacuum guage would be nice. a scan tool to read o2 sensor voltages would be really helpful to do the propane trick as well.

the propane trick is an unlit tank of gas with a torch tip utilizing a (fuel grade)rubber hose extension to pipe the fuel along intake manifold gaskets, and enywhere else unmetered air could get into the engine creating a rough idle. open the tank about 1/4 turn and move slowly and avoid the maf.

watch for o2 sensor voltage spikes indicating the leak has been found. move away, voltage starts cycling normal again. move back, voltage should spike again.

repair leak.



df
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  #4  
Old 12-03-2011, 07:32 AM
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TheFinanceGuy TheFinanceGuy is offline
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Where is your idle at?

Mine was just plain to low... At about 600 it was rough and bounced around (well after repairing lots, and I mean lots of vacuum leaks). Had BMW turn up the idle to about 850, all is well now!
Of course the higher speed. Old just be masking another leak, but it works.

I'd be willing to bet you have cracked rubber hoses under your upper intake manifold.
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Old 12-03-2011, 02:30 PM
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ZeGerman ZeGerman is online now
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^Normal idle is about 650rpm. 850rpm on a warmed up engine is a bit high.
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  #6  
Old 12-04-2011, 06:09 AM
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TheFinanceGuy TheFinanceGuy is offline
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Quote:
Originally Posted by ZeGerman View Post
^Normal idle is about 650rpm. 850rpm on a warmed up engine is a bit high.
good point, I guess it would have helped if I said that was the cold idle speed. sorry!

It does idle about 700ish when warm. which I know is high, but it helped the roughness that I couldn't solve.
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Old 12-04-2011, 06:31 AM
floptop318i floptop318i is offline
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Propane test? haven't tried that!

The propane test is interesting, I have the propane but I don't have a scanner. I have carsoft, but I don't know if I can read 02 voltage with that.
The Idle is smooth when the engine is cold.
Idle speed is normal (800). if I raise the engine speed to 1000, I still have some roughness.
I have sprayed B12 around the intake and vacuum hoses without seeing a change.
I will hook up the vacuum gauge and see what that looks like.
I will try all of these ideas.
Thanks everyone!
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Old 12-04-2011, 09:51 AM
floptop318i floptop318i is offline
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What type of scan tool do you recommend to read the 02 sensor voltages?
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Old 12-04-2011, 12:11 PM
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drivinfaster drivinfaster is offline
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any one that has a high sample and display rate. (baud, iirc) an easyway to check this is to snap the throttle and watch the rpm. the faster that mirrors the actual rpm the better. this should also equate to a similarly faster o2 voltage display.

then just watch for the voltage spike and hold when you locate the leak (if present) along the manifold and ports.

just watch the maf.


df
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  #10  
Old 12-04-2011, 12:57 PM
Eight Thirty Eight Thirty is offline
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my idles under 600 id say.... its pretty low
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