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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 03-17-2012, 02:05 AM
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E36 m50 ICV vs E34 m50 ICV

I could've posted this in OT thread for a quick answer, but I felt like I haven't made a thread in a long time so i had the itch to make a whole thread about it

Soo since day one of the m50 swap, i've been running an idle control valve from an e34 (from the junkyard), and the motor has always had this stupid rev-hang issue which im almost starting to think is impossible to get rid of .. Well a buddy told me it might be just a dirty/stuck ICV so i took out the ICV and cleaned it out thoroughly (was dirty as hell). Put everything back together and for some reason, engine feels/sounds weak, and CEL came on.

A buddy of mine whos s50 is apart currently let me borrow his ICV to see if my whole piece is the problem. I compared ICV's and the tunnel for the ICV where the air ENTERS is significantly different between the two. Aside from the e34 ICV being a little more stubborn to loosen up, would the size of the entrance cause my engine to hang? The part numbers are different from both valves

I installed the e36 one just a few minutes ago, but didnt start the car yet because it was 1:30 am by the time I buttoned everything up . Tomorrow i'll start her up, hoping it makes a difference.

Anyway, here's the difference.. Notice how the e36 (fat silver one) icv tapers on the inside.. The e34 one, which is half closed in the pic, is just as big as the outer diameter..



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Last edited by cmybimmer; 03-17-2012 at 02:13 AM. Reason: Bigger pichurrz
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  #2  
Old 03-17-2012, 06:33 AM
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I hope it fixes your problem. The rev hang was kinda annoying
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  #3  
Old 03-17-2012, 07:05 AM
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You have noooo idea! Try driving like that for 7 months plus lol

Thx man, I hope it works too
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  #4  
Old 03-17-2012, 07:06 AM
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sama go start it now!!!!
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  #5  
Old 03-17-2012, 07:16 AM
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Too cold outside, and I'm feeling real cozy under the blankets! Plus its 7:15, should be illegal being up this early
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  #6  
Old 03-17-2012, 09:04 AM
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Internesting...

I have a feeling (in my pants, nohamed) this is the rev hang culprit
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  #7  
Old 03-17-2012, 10:15 AM
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That's interesting. I went to BAV auto and plugged in a 93 325 and a 93 525 (just chose a random year) and the ICV parts numbers were the same

Do you think it makes any difference if one came from a Vanos M50 and the other one did not?
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  #8  
Old 03-17-2012, 10:34 AM
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Both engines had vanos.. One was from e34, and other from e36 m3...


And the e36 icv fixed the CEL and hesitation problem.. But now we're back to square one. I swear this shiit is near impossible to fix
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  #9  
Old 03-17-2012, 12:46 PM
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Well that blows... =/


At least you can drive your car again!
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  #10  
Old 03-17-2012, 01:48 PM
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Yeah.. With a slow coolant leak

And still a hanging engine
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  #11  
Old 03-17-2012, 03:16 PM
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You should buy an e36. At least when something breaks you can fix it and move on.

With an e30 you "think" you fix it but end up creating a whole new problem.
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  #12  
Old 03-17-2012, 04:21 PM
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What about the throttle body? Does it hang when its reved while parked? Have randy rev up the motor and watch the tb to make sure it closes right after he lets off the pedal...
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  #13  
Old 03-17-2012, 04:30 PM
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Yes, it does hang while the car is parked. When I rev from the engine, i even make sure the butterfly is completely closed and it still hangs =/
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  #14  
Old 03-17-2012, 04:34 PM
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What DME are you running?
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  #15  
Old 03-17-2012, 04:36 PM
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413 red label from an auto e34 with vanos m50.. Shouldn't make a difference though :/

I even tried the ecu from my brothers e36 which is also a 413 red label and the hang was even worse
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Old 03-17-2012, 04:39 PM
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What about TPS? I had mine go out on me (when I was down there last time)..
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  #17  
Old 03-17-2012, 04:43 PM
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Do those often go out?

talking about this piece?



what were the symptoms on your car when it went out?
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  #18  
Old 03-17-2012, 05:14 PM
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TPS mounts right on the side of the TB. The car would buck/stumble really hard after the CEL would go on. The idle would also be pretty high, like 1200
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1995 BG M3 2000 TiAg 4.4l X5

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  #19  
Old 03-17-2012, 05:39 PM
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its worth a try.. Ill have to check it out somehow because I don't want to buy a whole new unit at ~$50 to find out it didnt do the trick ya know? Might make a trip to picknpull to see if there are any there to try out.
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  #20  
Old 03-17-2012, 05:43 PM
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You can check the resistance, or swap the one from the bro's car
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  #21  
Old 03-17-2012, 05:47 PM
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This is true

Ill probably do that since I dont have a multimeter ... Im too fat to do it now though so it'll have to wait lol.. Would I need to disconnect the battery upon switching them out or can I switch em with the battery on without damaging anything?
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  #22  
Old 03-17-2012, 05:54 PM
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Its pretty simple, I didn't unhook the battery. Remove the connector, pull the TB off, then remove 2 screws holding the TPS. You have a free swap motor, I would just try changing things out to see if either your car or bro's car change at all.
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  #23  
Old 03-17-2012, 05:57 PM
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Shall do this! Might do it in a few minutes depending on how motivated I am..

Oh... nvm just looked outside and still raining
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Old 03-17-2012, 06:00 PM
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Its better than snowing (like here)
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1995 BG M3 2000 TiAg 4.4l X5

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  #25  
Old 03-17-2012, 06:08 PM
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I hate rain bro, in every way possible. The only plus to it is it makes our grass greener in the front yard

anddd before anyone hops in here to argue how we need the rain because of drought and whatnots, save it.. Im just exaggerating a little
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