Hunting for idle when coasting, VSS related?

[trackjunkie21]

I checked mine at the engine side of the O2 plug (peel back the boot). Check for voltage at between the BRN and GRN wires.

You can also check for voltage at the socket for the 30 prong of the relay. I'm not sure if it matters if the relay is plugged in or not though. I guess you could jam in a wire with the relay plugged in like I have at times for testing.

Was going to check today but I forgot I did install a new ICV and that did nothing :(

[Beej '86 325es]

I should check my 02 sensor, should I check at the 02 sensor plug? Or at the relay?

I checked mine at the engine side of the O2 plug (peel back the boot). Check for voltage at between the BRN and GRN wires.

You can also check for voltage at the socket for the 30 prong of the relay. I'm not sure if it matters if the relay is plugged in or not though. I guess you could jam in a wire with the relay plugged in like I have at times for testing.

[trackjunkie21]

I should check my 02 sensor, should I check at the 02 sensor plug? Or at the relay?

[Beej '86 325es]

Being that I've timed the issue on my car to start running correctly after 8:45 to 9:00 minutes 5 times, this leads me to believe it's a sensor problem somewhere.
...too coincidental for vacuum leaks or burnt up wiring...UNLESS the DME is programmed to ignore the problem after a certain time.

[trackjunkie21]

I find it hard to believe it's because of using the e36 harness, maybe coincidence?

[328ijunkie]

I always use E36 harnesses....

[lolcantturn]

87 325i/e34 harness/413 red DME

Mine runs like a fucking champ, never hunts for idle. Pin 42 gets its speed signal from the green plug on the back of the cluster.


I know you guys don't have a C104 but maybe this will help to get your econometer working (although it won't be accurate)
DME Pin 24 on mine goes to the c104
DME Pin 14 on mine goes to the black wire of the c104

Hear that folks? E34 harness! All us guys with problems have E36 harness's! Im not going crazy! Never had this issue with my last swap car and it was exactly the same setup and pinout chart as my current one which has an E36 harness!
Econogaug did work on my last swap car too :(

[328ijunkie]

Ive also never had this issue on any of my or my customer cars...

[e30rapidic]

87 325i/e34 harness/413 red DME

Mine runs like a fucking champ, never hunts for idle. Pin 42 gets its speed signal from the green plug on the back of the cluster.


I know you guys don't have a C104 but maybe this will help to get your econometer working (although it won't be accurate)
DME Pin 24 on mine goes to the c104
DME Pin 14 on mine goes to the black wire of the c104

plus - how old are your vacuum hoses???? reusing old hoses is like reusing gaskets....may work but probably won't

[lolcantturn]

bump

[trackjunkie21]

Is this what makes the gauge actually work? Mines working and reading well it seems.

[lolcantturn]

I'll have to check and see if mine does that too.

I noticed the fuel consumption wire that feeds the economy gauge also goes through the DME. I found that mine was not connected at all.
Any chance that would affect engine running?

mine no worky either.

[Beej '86 325es]

I'll have to check and see if mine does that too.

I noticed the fuel consumption wire that feeds the economy gauge also goes through the DME. I found that mine was not connected at all.
Any chance that would affect engine running?

[trackjunkie21]

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.

[trackjunkie21]

I don't want to jinx it, but are you sure it wasn't just the O2 clicking on?
Once mine clicks on, A/F ratio returns to normal and the car runs fine, but it takes a while.

Well you jinxed it :D, just kidding but the problem has come back. It actually works opposite to yours. The fluctuation happens once the car warms up. 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. About to run a wire from
The cluster to the dme.