SLOVED!!! ANY Ideas?? Spark / Ignition Cutting out

[FLG]

If you were closer you'd have a known good cps to test with Lol! Anytime.

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[ct3155]

No, not that I know of. Signal. Should just go thru the harness into the dme. Can you replicate the symptoms exactly with different cps 's?

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That's what I thought too. I have too CPSs. One plastic one metal, both ohm out in spec. Also have tried multiple dmes, the problem exists in every situation or combination of those switched around. So it would have to be something I'm not changing.... Or it's time to buy a third new metal CPS. Hahaha!

[FLG]

It be hard pressed to blame the cps if the issue is identical with both.

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[ct3155]

It be hard pressed to blame the cps if the issue is identical with both.

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That's why I get so mad at this problem. It seems as though I've chased everything three or four times now..

[ct3155]

What does that fact that it can idle fine once started and settled out tell us? Anything? Or even when driving. Like, I just know In between gear Changes it will have to hiccup for a second then I go on my way...

It just seems so intermittent.

[FLG]

Thats what the weird thing is, id expect either it to be fixed with a good cps or have slightly different symptoms if the swapped cps is also bad

A bad tps could cause startup issues and WOT issues, but no CEL and no tach drop off.

This is a long shot, but does your car have a 13 button obc?

[ct3155]

It does have 13 button obc. It's functions all work.

[FLG]

Did you check the air gap on the cps to the wheel is 1mm?

I know when i had this issue someone through out the idea that the OBC code relay control could be causing the issue. Didnt turn out to be, but was reasonable.

Also, did you make sure the harmonic wasnt bent or something and wobbling?

[ct3155]

I did check the gap. That was good for sure. Maybe I will take the harmonic off an inspect it real close and pay attention while putting it back on.

I saw in your thread, someone mentioned front main bearing could be bad.... Hope this isn't the case... I mean my engine has always seemed healthy.. But it's still old I guess.

[FLG]

Yeah Jim mentioned that.

Worth a look at.

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[ct3155]

Well shit. Lol.

[SpecM]

I am still having the exact same intermitant issue, MIL and ignition cut-out and tach drop when the throttle is released or when returning to idle

my car will go for a couple days and not act up... and then it will do it several times in one trip!

seems to act up more so when its a bit warmer

I have replaced DME (tried three, used), CPS (new from BMW), engine harness (used), all ignition parts (all new OE stuff), fix a couple little vac leaks

[SpecM]

anyone have any updates?

[ct3155]

I'm in the process of taking my front end apart and replacing with a real oem metal CPS. I've replaced multiple computers. I know that isn't it. I even tried the 90's 525 ECU. Engine ran normal but still cut out under load.

I'll keep this updated as my process thankfully it's a summer car.

[SpecM]

I've got a used harmonic balancer that I'm going to try this week. will keep posted