lovemyp-car
02-20-2010, 08:42 PM
I can't seem to figure this one out guys...so i'm looking for some help. the 948 developed an intermittent problem, where the car would die and not restart (would crank but not fire) for about 10 minutes...then would restart and run fine until it would do it again. I haven't been able to fix it yet...i've tried replacing several things and reworking some wiring.
so far i've done this:
replaced Ignition Control Module
replaced Ignition Coil
rewired all of my computer/engine grounds
After i did all of this work, the car seemed to be fine, but i didn't get to take it for a drive, it was idling and revving beautifully, i drove it up and down our long driveway a few times, got it real warm...let it cool off, then got it warm again and it never really died. it did however conk out, but immediately restart by giving it some gas and cranking it for a few seconds...seemed odd.
the other day my dad started it and let it warm up, and it died and wouldn't restart just cranking it, he didn't try giving it gas while he cranked it, so i don't know if that would have worked.
what do you guys think this could be? i know i have pressure at the rail (not confirmed by a gauge, just by the "push the little button and see if it sprays" test)...i know i have a working fuel pump (i can hear it run...i have the fuel pump hardwired so it comes on when the key is in the on position). I also know that i'm getting spark on by the old "pull a plug and crank it with the side of the plug grounded" test. so what the hell is going on???
My initial ideas are...fuel pump could be bad (just makes noise, doesn't actually push enough fuel)...fuel filter (this probably needs to be replaced anyway, so it's first). Other than that i don't really know...maybe bad fuel?
thanks for reading the long post!
Ethan
P.S. for those that didn't see my introduction...i have a 1987 Porsche 944 that i swapped a 1997 Pontiac Firebird Formula LT1 into...it's got a few aftermarket parts...throttle body, intake, LT4 cam...but other than that mostly stock
here's a link to my intro for those of you who want to read a little more/see some pictures
http://www.ls1lt1.com/forum/showthread.php?t=33968&highlight=944
so far i've done this:
replaced Ignition Control Module
replaced Ignition Coil
rewired all of my computer/engine grounds
After i did all of this work, the car seemed to be fine, but i didn't get to take it for a drive, it was idling and revving beautifully, i drove it up and down our long driveway a few times, got it real warm...let it cool off, then got it warm again and it never really died. it did however conk out, but immediately restart by giving it some gas and cranking it for a few seconds...seemed odd.
the other day my dad started it and let it warm up, and it died and wouldn't restart just cranking it, he didn't try giving it gas while he cranked it, so i don't know if that would have worked.
what do you guys think this could be? i know i have pressure at the rail (not confirmed by a gauge, just by the "push the little button and see if it sprays" test)...i know i have a working fuel pump (i can hear it run...i have the fuel pump hardwired so it comes on when the key is in the on position). I also know that i'm getting spark on by the old "pull a plug and crank it with the side of the plug grounded" test. so what the hell is going on???
My initial ideas are...fuel pump could be bad (just makes noise, doesn't actually push enough fuel)...fuel filter (this probably needs to be replaced anyway, so it's first). Other than that i don't really know...maybe bad fuel?
thanks for reading the long post!
Ethan
P.S. for those that didn't see my introduction...i have a 1987 Porsche 944 that i swapped a 1997 Pontiac Firebird Formula LT1 into...it's got a few aftermarket parts...throttle body, intake, LT4 cam...but other than that mostly stock
here's a link to my intro for those of you who want to read a little more/see some pictures
http://www.ls1lt1.com/forum/showthread.php?t=33968&highlight=944