Cold start engine shakes and sputters

[bearsbmw]

did not solve the problem

[roundel318]

Dang, at least we can put it on the list of things that are checked off.
:rolleyes:

[bearsbmw]

I take it back it was fuel presure regulator all the way!!! GOD DAMN !!

Problem is fixed! thank everyone so much for the imput and help

[roundel318]

Nice!
We will have to hit up a few others and have them see if they can replicate the fix!

[bearsbmw]

Nice!
We will have to hit up a few others and have them see if they can replicate the fix!

I forgot to reset the ecu after I messed around with the regulator and after I did the reset it was like magic!! I suggest everyone take a look at there's and or replace it

[roundel318]

So it was the regulator, you resetting the ECU, or both?

[bearsbmw]

both !

[AcSchnitzer318is]

How did you get the regulator off the rail?  I was going to replace mine some time ago but gave up after struggling for a half hour or so.  Damnit this could have been fixed months ago.  Oh well at least you found the cultprit in your case.  I hope it fixes mine as well.

I wonder why it only has an effect on initial start?  I'm all excited now...

[roundel318]

It was the one back at the tank, not the one on the engine.

[KyleTaylor]

So did you do the retro fitted check valve or replace the factory one... which I assume requires a the entire pump...... or what?

[roundel318]

Bearsbmw will have to post, I provided the reference car.
Take your back seat out and take a peek.

[bearsbmw]

On my car it was the one at the fuel rail but on your e30's it is wise to replace the regulator at the rail and the check valve at the fuel pump under the seat and then reset your ecu...for some reason the ecu would not learn that I fixed the regulator and after the reset it worked like the day I got the car... If my 1995 OEM orginal was sticking I can't imagine what your's is doing

[AcSchnitzer318is]

I bet mine is the one at the tank... since it did it post engine swap... oooohhhh the excitement grows....

Anyone have a realoem diagram of that tank regulator?  I haven't looked under that seat in awhile and want to know what to look for.

[bearsbmw]

I bet mine is the one at the tank... since it did it post engine swap... oooohhhh the excitement grows....

Anyone have a realoem diagram of that tank regulator?  I haven't looked under that seat in awhile and want to know what to look for.

Photo taken from another thread on this site

[JP 91iS]

I can't find one on realoem. :confused:

From the "warm start problems" thread that dark islight posted, it looks like he added a check valve where there was not one previously.

Maybe the E30 fuel pump has a built in mechanism that is supposed to do what the check valve does: retain pressure on the fuel supply lines when the car is off?



EDIT:  ^yeah thats the one I think he added.  I couldn't find a part on realoem with that PN.