Having some engine trouble.

[kowalski]

i read somwhere about the fuel systems having trouble on E30's when its below half a tank some times, the pump can't hold the presure cause of less fuel, top it off or clamp the return line and see if she winds up, also im more partial to the chevron gas... anywho sounds fuel related, i have that problem as well but its only when i first start the car and its at the low RPM's not the the high... anywho good luck to ya

[Jand3rson]

n00b question: What is the CPS?

crank position sensor

That's what I was thinking, thanks for the confirmation.

Sounds and looks like the definite cause of your M20 woes, Jordan.

[e30sd]

n00b question: What is the CPS?

crank position sensor

[Jand3rson]

n00b question: What is the CPS?

[e30sd]

http://www.bmaparts.com/epcksoap.epc...entid=bmaparts

why are there 2 on 9/87-up?

[Jordan]

I think my CPS packed up and went home.

I took it out to have a good look at it, its definately toast.

The big yellow and black wires look fine. The 2 small black wires, the shielding, and the rubber cord are wasted.

pic:

http://www.r3vlimited.com/Media/e30theproject/Pictures/February2005/022105-001.jpg

Looks like I need to hit Patrick up for one of these tomorrow.

[nando]

I would test all your sensors (CPS comes to mind, should be about 540ohms of resistance), coil, etc.

electrical problems suck, I still haven't fixed my TPS. gotta rewire the whole damn thing too... yeah, make sure your TB isn't leaking coolant :P

[rs4pro3]

Ya I looked at mine in the attic and it is, always wondered why the manual talked about adjusting it untill I got the m30 one. But check's it's wires and make sure there good and the sensor is snugged down tight. Only other idea I have is to check out the fuel pressure.

[Jordan]

can't remeber if the e30 one is adjustable or not.

Pretty sure its a fixed position.

[Jordan]

clogged fuel filter?

<9k miles, tank was opened and flushed, so I'm sure its clean.

Bad injector?

<9k milesCleaned and flow matched remanned injector set

Bad Spark Plug?

<9k

ECU needs resetting?

I disconnected the battery, will reconnect after dinner.

air leak of some sort?

I doubt it.... but I will look over the obvious.

[rs4pro3]

Ya I was going to mention the Crank sensor, I know the m30 motronic 1.3 one you can adjust the distance of it from the gear, can't remeber if the e30 one is adjustable or not.

[Jordan]

I will check the harmonic balancer teeth and CPS for cleanliness.

[Skafrog]

clogged fuel filter?
Bad injector?
Bad Spark Plug?
ECU needs resetting?
air leak of some sort?

I know your motor is basically brand new, so I would check all the external conenctions etc.

[UNHCLL]

tried adding some octane booster?

chance there is crap in your crank teeth giving a mis-trigger?

[Jordan]

Nope, 2 different Shells, about 80 miles apart.