Car Dies at Light

[Est817]

I got an 86' 325es back in February. Since I drove it I discovered what all the hype was about. It's had a lot of work done from:
885 head, wiring harness, gasket kit
Rebuild fuel injectors
270 regrind cam
ect...

It recently died on me while waiting at the light, and wouldn't restart. I noticed after about 30min, it restarted and drove fine for about 15/20 min and then the problem would occur again.

After doing some research I came to a few conclusions.
1.My main fuel pump relays
2. Distributor rotor + cap

If i'm overlooking anything, please let me know. Any other suggestions are welcomed.

[2mAn]

If i'm overlooking anything, please let me know. Any other suggestions are welcomed.

you suck.

Will the car idle at all?

If it starts then dies, can you r3v it and will it fight you or will it smooth out?

Can you do a burnout?

Do you know how to post pics?

[Est817]

you suck.

Will the car idle at all?

If it starts then dies, can you r3v it and will it fight you or will it smooth out?

Can you do a burnout?

Do you know how to post pics?

Car struggles a bit when idling.

When I rev it, it does fight.

[IMG][/IMG]

[ELVA164]

I would suggest not stopping at any lights until the issue is resolved.

Do you know if/how the ECU is tuned for the different head and cam? Rebuilt OEM injectors or something else? Is it a "soft" or a "hard" miss? Soft meaning the car loses a bit of power, but still runs somewhat, and hard meaning a total loss of power, even momentarily.

[2mAn]

I would suggest not stopping at any lights until the issue is resolved.

Do you know if/how the ECU is tuned for the different head and cam? Rebuilt OEM injectors or something else? Is it a "soft" or a "hard" miss? Soft meaning the car loses a bit of power, but still runs somewhat, and hard meaning a total loss of power, even momentarily.

I helped him with the 2.7i build, though it was assembled by a knowledgeable friend. ECU & wiring harness is the 173 & Motronic 1.3. Injectors are M20B25 blues that were rebuilt by MEPEH. The tune is a no-name cam (that I dont think he's installed yet). Its temp fix until we can get the correct chip, but now its trying to get the car to a reliable point.

Not sure about the other stuff, I havent seen the car lately

[ELVA164]

I helped him with the 2.7i build, though it was assembled by a knowledgeable friend. ECU & wiring harness is the 173 & Motronic 1.3. Injectors are M20B25 blues that were rebuilt by MEPEH. The tune is a no-name cam (that I dont think he's installed yet). Its temp fix until we can get the correct chip, but now its trying to get the car to a reliable point.

Not sure about the other stuff, I havent seen the car lately

I see. I'm not super well-read on the swap, but a soft miss would suggest a fuel delivery issue and a hard miss would suggest electrical. OP, you may want to look into that as a next diagnostic step.

[Das Delfin]

sounds like a fuel pressure issue.. either your fuel pressure regulator or there's a check valve as part of the fuel pump. Does your fuel pump(s) make a loud grainy sound?

[e30onBBSs]

It only dies at idle? Once it dies it will just crank and not start until 30 minutes later?

[Est817]

It completely dies at the idle. and then has troubles restarting/staying on.
after a good 15 - 30 min wait, it'll start back up no problem, and stay on for a bit before dying again. fuel pump does make a grainy sound. I'm thinking it's a fuel pressure issue. after looking into it, it seems to point to that more and more.

[ELVA164]

Maybe also a fuel tank vent issue? Fuel pressure goes negative because the vent isn't letting any/enough air in, then it slowly equalizes while sitting.

[2mAn]

updates?