Author Topic: Cranks but won't start (Read 4566 times)

e30arm · « **on:** January 09, 2010, 06:34:21 PM »

Hello everyone!
I am a new and proud owner of E30 318.
I had this car for over a year now. The car was running fine, until alternator died.
The car was sitting in my garage for over 6 months, couple of days ago I installed new (reman) alternator.
Not it cranks but wont start, and I can't hear the fuel pump running, so I bought new fuel pump off ebay, and still the same problem.
Any ideas what could be wrong? Is there any relay or fuse for the fuel pump?

e30arm · « **Reply #1 on:** January 09, 2010, 08:04:02 PM »

plz somebody help

dj91318is · « **Reply #2 on:** January 09, 2010, 09:34:41 PM »

Hello e30arm - Wish I could be more specific and help you besides telling you to search on here. Look in the Engine and Drive line section you will fined all your answers. There is a lot of threads that has been written about this. Do you have a Service Manual? GL

DesktopDave · « **Reply #3 on:** January 09, 2010, 10:15:48 PM »

First do the stomp test to see if you have stored codes. If you get a 1444, I'd figure it's the crank position sensor, fuel pump relay, or associated wiring.

Pull & test the fuel pump relay (it's mounted on a small 3-relay block under the firewall plastic). It'll click if you put 12v on pins 85 & 86. While it's out, short pins 30 & 87 on the socket with a bit of wire & see if that wakes up your pump.

Check the resistance of the crank position sensor. Should be 'round 600 ohms. The ECU/DME won't turn on the pump until the crank position sensor sends a signal.

e30arm · « **Reply #4 on:** January 10, 2010, 02:22:06 PM »

thanks for your responses.
I just did stomp test and came up with 1 1 2 1 code.
I am checking the relay now

e30arm · « **Reply #5 on:** January 10, 2010, 02:48:40 PM »

Pull & test the fuel pump relay (it's mounted on a small 3-relay block under the firewall plastic). It'll click if you put 12v on pins 85 & 86. While it's out, short pins 30 & 87 on the socket with a bit of wire & see if that wakes up your pump.

when I did this, the pump turned on, and didnt turn off is it normal?

i tried to start it but it didnt

e30arm · « **Reply #6 on:** January 10, 2010, 02:59:39 PM »

I found the problem.
When i replaced the valve cover gasket, i didnt put the spark plug wires in order.
Thanks to this thread http://m42club.com/forums/showthread.php?t=10414

carlos318is · « **Reply #7 on:** January 10, 2010, 03:05:57 PM »

Glad you got it sorted mate

e30arm · « **Reply #8 on:** January 10, 2010, 03:21:57 PM »

thanks to all of you

DesktopDave · « **Reply #9 on:** January 10, 2010, 03:46:48 PM »

Quote from: e30arm;84348

Pull & test the fuel pump relay (it's mounted on a small 3-relay block under the firewall plastic). It'll click if you put 12v on pins 85 & 86. While it's out, short pins 30 & 87 on the socket with a bit of wire & see if that wakes up your pump.

when I did this, the pump turned on, and didnt turn off is it normal?

i tried to start it but it didnt

Glad you got her back on the road. FYI the pump will stay on if you do this test.