M42 Full Rebuild now won't start

[theTBLACK]

Last night I installed 4 rebuilt injectors.

Hooked up the rail - covered the injectors with ziploc bags.

When cranking, all of them were firing fuel. So the old injectors somehow all went bad at once - or something weird is going on.

Either way, i'm dropped it off at a trusted shop and i'm let them figure it out.

I've dumped many hours and too much money into this 4 cylinder motor, hopefully they can figure it out relatively quickly.

I'll keep you posted!

[bmwman91]

Weird. Maybe the old ones had some bad fuel in them or something and got varnished shut when they were sitting. It sounds like you should have a working vehicle soon!

[theTBLACK]

IT RUNS!

The exhaust was clogged and it needs a new catalytic converter. The engine couldn't breathe.

[bmwman91]

Lol

Holy hell, that was unexpected!

[Gkwan]

I think you owe us a video of it actually running!

Congrats on getting it running!

[jpod999]

Damn, that's backpressure for you! I wasn't far off in my kink in the line suggestion a few pages back, I just had the wrong system!

[Dj Buttchug]

holy ballssssessss

[theTBLACK]

Quick update - After taking off the exhaust, the car did in fact run. We didn't rev the motor very high as we couldn't hear the valve train. Anyway, we had a new cat welded in at the exhaust shop.

On the way back from the exhaust shop with the exhaust back on - we encountered an issue that we were experiencing before the rebuild.

When I first got the car it would run, and idle fine. But upon giving it gas and accelerating up around 3rpm, it would lose power and die.

This same problem is now occurring - i'm thinking that the exhaust may be clogged somewhere other than the CAT now as the whole system is aftermarket -

I'm going to take off the exhaust tomorrow and see if that solves the problem.

I'll get a video tomorrow and share it here!

[Cephas]

Quick update - After taking off the exhaust, the car did in fact run. We didn't rev the motor very high as we couldn't hear the valve train. Anyway, we had a new cat welded in at the exhaust shop.

On the way back from the exhaust shop with the exhaust back on - we encountered an issue that we were experiencing before the rebuild.

When I first got the car it would run, and idle fine. But upon giving it gas and accelerating up around 3rpm, it would lose power and die.

This same problem is now occurring - i'm thinking that the exhaust may be clogged somewhere other than the CAT now as the whole system is aftermarket -

I'm going to take off the exhaust tomorrow and see if that solves the problem.

I'll get a video tomorrow and share it here!

Looking forward to the video.

Also for others chasing down similar issues: my 89i track car will not prime the pump with the key in the "On" position. Only during cranking. Also, for what it's worth, it will not prime the fuel pump even if I jump it.

Good luck with your car!

[theTBLACK]

Anyone still subbed to this thread?

The car runs and idles great, but starts to sputter around 2.5 rpm.

If you let it warm up for 20 minutes, it revs just fine all the way up.

Any thoughts?

Thanks guys!

[bmwman91]

I forget, did you replace the coil packs? They can do weird stuff like not fire if they are failing, depending on if they are hot yet.

Otherwise, it sounds like the carbon track on the AFM is going bad. Can you borrow a known good one and try it?

[theTBLACK]

I forget, did you replace the coil packs? They can do weird stuff like not fire if they are failing, depending on if they are hot yet.

Otherwise, it sounds like the carbon track on the AFM is going bad. Can you borrow a known good one and try it?

Yup. Coil packs have been replaced. The AFM I replaced it with was a known working one - i'll see if I can get my hands on another one.

[Dj Buttchug]

running right now?

[theTBLACK]

running right now?

Yes sir.

[theTBLACK]

Anyone still here?

R3v facebook has convinced me to keep going and figure this out - even though i'm on mechanic number 3.

Current status -

Starts and idles perfectly.

Upon cold start, won't really rev above 2.5 - Starts to sputter and bounce back like its being limited.

Once it warms up for 20 minutes - revs all the way up.

Ideas?