Another Bogging down issue

[Caperix]

I thought I made some progress on mine. My cat had a bit of a rattle to it so I disconnected the exhaust at the manifolds & the misfire seemed to stop. So I thought that bad rocker arm had melted the cat. So today I cut the cat off the car so I could run with the o2 sensor connected. The cat was hallow, so the cat had melted but had been pushed out the exhaust. Unfortunately once the engine warmed up the misfire was still present. So either the o2 sensor was damaged or I did not let it run long enough with the exhaust disconnected for the issue to occur.

[Caperix]

I thought I made some progress on mine. My cat had a bit of a rattle to it so I disconnected the exhaust at the manifolds & the misfire seemed to stop. So I thought that bad rocker arm had melted the cat. So today I cut the cat off the car so I could run with the o2 sensor connected. The cat was hallow, so the cat had melted but had been pushed out the exhaust. Unfortunately once the engine warmed up the misfire was still present. So either the o2 sensor was damaged or I did not let it run long enough with the exhaust disconnected for the issue to occur.

[Caperix]

Going through this myself on my car. We sent it out for paint, when we got it back the car would not start due to a bad crank sensor. Put a crank sensor in it & it ran rough from a broken intake rocker. Replaced the rocker arms now I have a hot misfire when accelerating. Same issue as you with the plugs looking white & lean.
I read some older posts about the vibration damper getting play in it & losing crank signal. Mine felt tight & does not seam to move when the engine is running. It would be worth checking on yours. I need to check the cps gap on mine to make sure the aftermarket one is not sitting wrong. I have a scan tool that will read signals from the dme but nothing seems off, it is a very slow stream though.
update this with your finding & ill update if I find anything on mine as we could be chasing the same problem.

[Tom Galloway]

Do you have a Bentley book ? In 3-19 they say it may be coolant temp, oxygen sensor, charcoal canister purge valve, clogged injectors. Idle air valve , intake leaks, , and a couple more . IMHO try some "Sea Foam" cleaner in the fuel. You can pour it in the gas and / or use the spray can by drilling a small hole in the boot and inject directly into the running motor - seal the boot with silicone.

Very frustrating, I've been there. E 30's are so tough that I think the main problems could be reduced to either dirt or leaks. Good luck

tg

[It's Soda Not Pop]

No worries

[completelyrevlimited]

Hell at this point I would at least try it

Will take a look at that when I get the chance as well. Especially if it only stops fuel. Thanks!

[It's Soda Not Pop]

Hell at this point I would at least try it

[It's Soda Not Pop]

https://www.r3vlimited.com/board/forum/e30-technical-forums/general-technical/49808-obc-immobilizer-bypass

[It's Soda Not Pop]

I think it only stops the fuel.

[completelyrevlimited]

I meant to ask do you have a 13 button obc?

I do, I thought the code feature might be causing it, but theoretically it would stop both spark and fuel, or am I wrong?

[It's Soda Not Pop]

I meant to ask do you have a 13 button obc?

[completelyrevlimited]

Check TPS idle switch resistance while throttle is in the middle if there is a smaller value the idle switch stuck due to oil in it.

Try disconnecting TPS and see if it revs smoother.

No change on it unplugged, heard it was suppose to be in limp mode, couldn't even rev open throttle. Also tested it, seems working.

[ADEN]

Check TPS idle switch resistance while throttle is in the middle if there is a smaller value the idle switch stuck due to oil in it.

Try disconnecting TPS and see if it revs smoother.

[completelyrevlimited]

Things to check:

CPS gap
fuel pressure
air hose between throttle & airflow meter

CPS gap is at .40

Fuel pressure is stated in first post.

Is the air hose for the ICV, or the smaller L from ICV to throttle? or the whole elbow in itself, and if you mean by leaks, first post also, eliminated air leaks through by blowing smoke.

[hasa]

Things to check:

CPS gap
fuel pressure
air hose between throttle & airflow meter