Help me diagnose, videos

[Lof8]

sometimes it idles fine, others it bounces all around. I will clean the icv soon. that is not my main problem.

I have spliced a number of videos into one to show how its cutting out hard at about 3.5 or 4k rpms. It will not accept full throttle - only up to about 3/4. It generally runs shitty and stalls a lot.

Help me out.
Thanks

I got a 1222 code today as well - oxygen sensor control (o2 sensor is brand new)

[e30s52]

Seems to me that it is the ICV is having some sort of vac leak.

[Lof8]

The video doesn't do a super job of showing it, but the car is hitting a brick wall at about 4k rpms - just cuts out.

Also doesn't respond to wot at all.

Then near the end of the video, you see it will idle fine.

[e30s52]

The reason why I said it might be the ICV is because I had a vac leak and it was causing the same problem.

[e30trooper]

DB look clean on you car

[Yage30]

So, I've looked at some different charts on OBD1 error codes, and I've gotten conflicting results between code 1222 and code 1221.

Some say 1222 is the O2 sensor circuit, and some say the code is thrown when the DME detects an improper fuel/air mixture ratio for more than ten seconds, which can be caused by low fuel pressure in the rail, an air leak past the MAF, etc. etc.

I've also heard that running an exhaust without a cat will throw the code for the O2 sensor circuit as well.

Just throwing my 2 cents in.

[KU Roo]

It sounds to me like you have a fuel starvation problem. ICV only takes care of the idle, I don't think that's the problem. Your bigger issue is that the car hits a wall at 3.5k - 4.0k. I had a similar issue back when I had the M20 still in the car.

Get a fuel pressure gauge, some hose, and a "T" fitting then put the guage "in-line" on the fuel line (delivery side, not return line). Check the bentley for the correct pressure at idle, then rev the engine while in neutral. You should see the pressure spike briefly as you rev the engine. The pressure regulator should do it's job and bring the pressure back down quickly. If you don't see the pressure rise when you rev the engine, the pump is weak. Of course a clogged fuel filter would cause similar problems. Good luck.

Andrew

[325issguy]

+1 on huge vaccume leak on the icv or something. My car idled the exact same and even worse when I had the hose on the icv fall off.

[gregslow318i]

vac leak, bad maf or a fuel problem. is the maf in the right direction?

[lennon]

i agree with these guys, its gotta be a big vacuum leak or fuel starvation. perhaps a hose is routed incorrectly or disconnected and you havent noticed? have you checked fuel pressure? has it run this way since you got in running? good luck man i hope you figure it out soon. mines still not even in the car but is now a 3.2 liter hahaha. these swaps...

[Lof8]

Well, I've been all over the intake side looking for a vacuum leak with no finds. There really aren't many sources for a leak. I replaced the icv to intake mani clip with slight improvement.

My next try will be a crank positions sensor - I've read about some similar symptoms for this.

I'm also a little concerned my catalytic converter may have clogged up - I'll look into this further if a cps does nothing.

There was one day where it ran decent (not perfect). Its been like this ever since.

Thanks for the help guys.

[gregslow318i]

dont bother with the cps if it was bad the car would not run, does you fuel rail have a fpr on it? is the maf installed correctly with the arrow pointing in the direction of air flow?

Well, I've been all over the intake side looking for a vacuum leak with no finds. There really aren't many sources for a leak. I replaced the icv to intake mani clip with slight improvement.

My next try will be a crank positions sensor - I've read about some similar symptoms for this.

I'm also a little concerned my catalytic converter may have clogged up - I'll look into this further if a cps does nothing.

There was one day where it ran decent (not perfect). Its been like this ever since.

Thanks for the help guys.

[Lof8]

dont bother with the cps if it was bad the car would not run, does you fuel rail have a fpr on it? is the maf installed correctly with the arrow pointing in the direction of air flow?

Thats what I thought too, but Jordan has a thread on bimmerforums with the same symptoms - his prob was a cps. He also thought the cps was all or nothing.

rail has the factory fpr on it.

Arrow is pointing direction of airflow on the maf.

[jahnaboi]

Thats what I thought too, but Jordan has a thread on bimmerforums with the same symptoms - his prob was a cps. He also thought the cps was all or nothing.

rail has the factory fpr on it.

Arrow is pointing direction of airflow on the maf.

Have you tried unplugging the maf and to see if the car would run better?

Also, could it be that you are hitting the soft rev limiter?

[jrdeamicis]

dont bother with the cps if it was bad the car would not run, does you fuel rail have a fpr on it? is the maf installed correctly with the arrow pointing in the direction of air flow?

That is wrong.

What sometimes happens with the CPS is that the signal is fine for low RPM 0-3000 but it starts to get broken up after that. Proven with an oscilloscope. Sounds EXACTLY like what happened to me. But the WOT sympton is a little different.