91 318is 1500rpm IDLE

[Crummy Cream]

Question: Why does my car idle at 1500 to 2k RPM?

New part list (things I have done)
1. MAF
2. ICV
3. ICV Upper & Lower Hose
4. TPS
5. spark plugs
6. intake boot

I've tried spraying brake cleaner on other vacuum lines, but i cant find if its a vacuum leak or something else.

[monty23psk]

2 possible reasons, throttle cable is calibrate to having it more open or it getting caught. The other is the wrong coding plug connected into the instrument cluster. Of course everything you swapped can be directly related to it.

so first, was this issue happening before you replaced all of this? if not, it would be related to the work you did or the cable which is in the area.

[Crummy Cream]

@monty23psk

I havnt domt anything to the throttle cable but i can tell u why i replaced all of that
Answer to your question is no

When i first got the car 6 months ago the car would idle from 800-500 rpms, but would even out after the car warmed up (but wouldnt have a high idle) i assuming a vacuum leak i found the icv vacuum hoses were shot so i replaced them. this made no change in the car... then i replaces the maf and icv. Still no change at all, but now even after the car warmed up the problem still existed . then i replaced the tps aye the car no longer changes idle like that, but it stays at a steady 1500. Now i did remove the instrument cluster to try and fix my speedo but gave up i no nothing about elecrtonics, ill have to check on the throttle cable, but how can i test the cluster.

[monty23psk]

You can't really test the cluster. I am assuming the cluster is back in the car. Did you remove the cluster after the RPM issue started? if you replace a and b and your issue starts after that, it normally means its because of that.  The ICV  or an not connected ICV can give you an idle issue. Just take a systematic approach and you should find it because it wasnt happening before.

[Crummy Cream]

I have not taken the cluster back out in a while ill check my the icv cause it was not east to get in

[Crummy Cream]

Okay so i just fixed a small vacuum leak that i found and now the car is idling very steady but at 2k exactly... omg sometimes i love this car but rn im frustrated

[monty23psk]

what happens if you leave the ICV unplugged?

[Crummy Cream]

When i unplug the icv the car will start to creep up to 3-4k rpm

[Crummy Cream]

Im starting to think maybe my tac is just reading the rpms incorrectly

[monty23psk]

That would be the coding plug. It is specific to the engine. You can get to it without remove cluster, just need to remove the 2 from covers. Bottom right under the temp gauge. check out my member thread.

[Crummy Cream]

Okay ill try that i work at a dodge dealer and one of the guys said there that the tps might be adjustable does anyone know this to be true?

[colin86325]

I was goiung to suggest adjusting the TPS.
http://www.m42club.com/forum/index.php?topic=16521.0

[Crummy Cream]

Yea i just have no idea whatsoever on how to calibrate it

[monty23psk]

Funny, that TPS thread is mine. I forgot about that. The adjustment is very little if any. You can try to move it to see if there is a difference.

[Crummy Cream]

okay so can you guys give me the dummy version on how to adjust this tps I can't figure it out because the holes are not oval shaped to allow for movement of the tps...   Here is a video of the car at idle on a cold start You can see how I went to the throttle cable to show it's not being pulled or anything at idle..

https://drive.google.com/file/d/0B0EwhfdQoPi2NnN4LVBVTlUwZE0/view?usp=sharing

so if you click that you'll be able to see that the idle is kinda high I'm just so confused, but it's a lot better than the car stalling on me all the time...