Hunting for idle when coasting, VSS related?

[trackjunkie21]

no, mine idles smooth as silk and never hunts for idle.

I go back to asking about the vacuum hoses. Are they new? or are you all re-using old ones? I used all new hoses. How is the ICV clip where it goes to the intake? I know those are notorious for breaking.
All my vacuum lines along with my ICV are brand new, the clip is brand new and for reassurance, I zip tied it to the manifold so it doesn't back out, there is a bit of oil residue on the manifold from it though

what about the adjustment screw on the throttle body? fiddled with that at all?
I was under the impression that their is no adjustment on the throttlebody.
mine did idle rough with the stock S50 chip but that's pretty much because of the lightweight flywheel. I now have a TRM chip and it's perfect.

Here is a video of me testing the said pin 30. Once the car is on the light appears to look green, it is actually red which tells me there is power at pin 30.

[trackjunkie21]

tested my tps, readings within spec:(

[trackjunkie21]

A lot of people are telling me that a bad TPS causes similar symptoms to what I have, even thought I tested the TPS which showed .5v at 0% throttle and 4.3V at WOT, with readings fluctuating in between. Could I still have a faulty sensor?

[Beej '86 325es]

Possibly...but man I think we would be throwing codes if it was something that obvious, right?

[Highway1]

When I got new cats put in I changed my 02 sensor and new spark plugs and my car no longer hunts. I occasionally coast to a stop to test it and every time the rpm is solid.

coincidence

[trackjunkie21]

I think not, i replaced my 02 sensor three times. And i have brand new spark plugs and coils which were then tested for resistance

[trackjunkie21]

well I had a really loud backfire last time, I went WOT from idle in neutral and it felt like it didn't want to rev up intil 2,500-3,000 when it backfired and then revved freely. tried it again and didn't backfire. hmm.

[trackjunkie21]

bump =/

[Beej '86 325es]

I've done a lot of reading on Bimmerforums' E36 M3 forum, and it seems like I've read about rough warm idle issues on there somewhere.

[trackjunkie21]

Any links? Would be most appreciated!

[trackjunkie21]

Did a compression today and all cylinders were exactly the same. After 3 cranks they reached 175psi as alldata specified. Here is a picture of the condition of the plugs. What say ye?

[matthugie]

I've been having a hunting for idle issue intermittently as well, been frustrating as shit. Pretty much all new hoses (with a couple exceptions, but smoke tested fine), 3.5" intake and boot (which was tuned for). Concurrently, the car would throw a CEL when redline was hit. The codes were run and there was a MAF code, which, when cleared, made the car run a shit ton better. Though, after some time driving, it comes back.

My current thought is FPR under the intake manifold coming unplugged, but that remains to be corroborated.

[trackjunkie21]

Also forgot to mention that I replaced the FPR with no effects.

[jahnaboi]

I've had this problem for a while but three things came to mind.

1) Purge valve / evap (I've read if you drive your car immediately from starting [mostly from warm] it would be vacuum locked causing hunting idle).

2) PCV

3) ICV

To eliminate / make my hunting idle at a minimal I used a larger ICV from a s52 with a custom hose to the intake boot as the newer ICV has a larger inlet and bought a new PCV valve. That got my hunting idle almost non existent.

[Beej '86 325es]

I drove mine yesterday for the first time this year and it does both of the things you mentioned below. When coasting to a stop, it goes to idle just as it would if I were parked. I turned it off and restarted it when it was only partially warmed up and it just reluctantly comes to idle revs.

Anyway i know it is still vss related because now the car doesn't rev up to 1,000 when coastong or driving down my driveway.

Another thing I've noticed is that when the car is full warmed up and I try to start it, it kinda slowly reluctantly revs to idle instead of revving up to about 2,000 as it should.