Hunting for idle when coasting, VSS related?

[trackjunkie21]

Hmm, well a friend of mine drove the car and he described it as the car has lean spots in the powerband, it would make sense, but what's causing it is beyond me. I have a new fuel filter I'm installing tomorrow as well as a new CTS, IAT sensor and intake manifold gaskets.

[Beej '86 325es]

Do you not have the locking clips installed?

I'm talking about on the injector itself. The plastic tip can "snaps" in and out of place on a few of mine. I'm not sure if it has any affect on it working or not, but it sure doesn't seem right.

[trackjunkie21]

Those secure it to the rail, not the manifold iirc

[Adrian_Visser]

I've got a fuel related theory on my car too. I pulled my fuel rail off and I just pushed on an injector to see if it was firmly attached to the rail and the tip "snapped" into place. I found that on 2 more injectors too.
They are rebuilt injectors, so I'm a little upset that they do that, so just to rule that out, I ordered another set.

Do you not have the locking clips installed?

[lolcantturn]

Guys I put an E34 harness in to replace my E36 one and my car has been working perfectly fine and amazing ever since. Perfect idle, great gas mileage, no hesitation, nothing, ever. 500 miles since replacing and its perfect. So..........:)

[trackjunkie21]

Hmm, now that you mention it, mine don't sit quite flush either.

[Beej '86 325es]

I've got a fuel related theory on my car too. I pulled my fuel rail off and I just pushed on an injector to see if it was firmly attached to the rail and the tip "snapped" into place. I found that on 2 more injectors too.
They are rebuilt injectors, so I'm a little upset that they do that, so just to rule that out, I ordered another set.

[trackjunkie21]

I think my culprit is a clogged fuel filter. The reason being the car leans out more and more the higher up I get in the rev-range. It's more of a gradual change so that would hint more towards a fuel related issue rather than something with the ignition/electronic.

[Beej '86 325es]

What about using the CCV hose? the smaller one?

I think that's on the PCV side of the system, which should be a different reading right? I'm learning as I go, but I believe you should get 3-5 inHg on the PCV side and 17-22 inHg in the manifold.
Someone correct me if I'm wrong.

[trackjunkie21]

I bought a gauge tonight and started to hook it up to the hose connecting the fuel pressure regulator to the bottom of the manifold. It's a bitch of a hose to get loose, and I accidentally pulled off the end connected to the regulator.
So tomorrow I get to remove the strut bar and fuel rail to reconnect the hose...hopefully not the wire harness...God that would suck.

What about using the CCV hose? the smaller one?

[Beej '86 325es]

Also to add, I know have rev hang when car is cold. That sounds like a vacuum leak to me. Hooked up a vacuum gauge and it read within spec so not sure if it is a vacuum leak anymore.

I bought a gauge tonight and started to hook it up to the hose connecting the fuel pressure regulator to the bottom of the manifold. It's a bitch of a hose to get loose, and I accidentally pulled off the end connected to the regulator.
So tomorrow I get to remove the strut bar and fuel rail to reconnect the hose...hopefully not the wire harness...God that would suck.

[trackjunkie21]

Also to add, I know have rev hang when car is cold. That sounds like a vacuum leak to me. Hooked up a vacuum gauge and it read within spec so not sure if it is a vacuum leak anymore.

[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.

[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.

[trackjunkie21]

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