1986 944 intermittent no spark or fuel
10-13-2017, 07:23 PM
#1
Intermediate
Thread Starter
1986 944 intermittent no spark or fuel
Hi, everyone, I am stumped here. I’ve read tons of forum posts and changed everything they’ve recommended. What I have is a problem that only happens intermittently. If whatever it is happens when the car is off, the car turns over but I am getting no spark or fuel. If the car is running and it happens, it will stall or run very rough. I checked the AFM is working and its wiring on the inside looks like New. Here’s a list of everything that’s been changed:
Starter
New Crank sensors (twice, from original to aftermarket, them to Bosch)
rewired the speed sensors plugs with new connectors
new spark plug wires
new distributor cap
DME
new dme relay(twice)
fuse box
new ignition coil
new fuel pump
fuel filter
fuel pump lines
Any ideas? It seems to be getting worse. Thanks for reading!
Starter
New Crank sensors (twice, from original to aftermarket, them to Bosch)
rewired the speed sensors plugs with new connectors
new spark plug wires
new distributor cap
DME
new dme relay(twice)
fuse box
new ignition coil
new fuel pump
fuel filter
fuel pump lines
Any ideas? It seems to be getting worse. Thanks for reading!
10-15-2017, 03:45 PM
#2
Pro
I chased the same issue for a long time, only having recently fixed it. Intermittent stalling/hard start that eventually progressed to a no start. Like you, I replaced both S/R sensors. Installed a new sensor harness to confirm all new continuity from sensors to the DME.
After a LOT of methodical trouble shooting, I traced my issue to a failed DME. Replaced it with the new unit from Focus9, and it’s been running beautifully since.
You list DME in your list of attempted fix actions already. Whats the nature of this attempted fix? New? “Known good” replacement? I came to the conclusion that even a “known/tested good” DME is in the neighborhood of 3 decades old and, to me, not worth the gamble.
Not a cheap fix, but a fix backed up by peace of mind knowing that there’s a lot of new equipment in there now, to include an updated, brand new DME.
My $.02 worth.
After a LOT of methodical trouble shooting, I traced my issue to a failed DME. Replaced it with the new unit from Focus9, and it’s been running beautifully since.
You list DME in your list of attempted fix actions already. Whats the nature of this attempted fix? New? “Known good” replacement? I came to the conclusion that even a “known/tested good” DME is in the neighborhood of 3 decades old and, to me, not worth the gamble.
Not a cheap fix, but a fix backed up by peace of mind knowing that there’s a lot of new equipment in there now, to include an updated, brand new DME.
My $.02 worth.
10-16-2017, 01:37 AM
#3
When u crank, does the rpm jump at all? If not, you should look into the SR sensor. I cleaned mine with degreaser and contact cleaner. Car started right up.
Just fixed mine today. Took 2 days and I replaced plugs, coil, dist cap. Was going to test the starter as next step too.
Just fixed mine today. Took 2 days and I replaced plugs, coil, dist cap. Was going to test the starter as next step too.
10-16-2017, 05:32 PM
#4
Intermediate
Thread Starter
I chased the same issue for a long time, only having recently fixed it. Intermittent stalling/hard start that eventually progressed to a no start. Like you, I replaced both S/R sensors. Installed a new sensor harness to confirm all new continuity from sensors to the DME.
After a LOT of methodical trouble shooting, I traced my issue to a failed DME. Replaced it with the new unit from Focus9, and it’s been running beautifully since.
You list DME in your list of attempted fix actions already. Whats the nature of this attempted fix? New? “Known good” replacement? I came to the conclusion that even a “known/tested good” DME is in the neighborhood of 3 decades old and, to me, not worth the gamble.
Not a cheap fix, but a fix backed up by peace of mind knowing that there’s a lot of new equipment in there now, to include an updated, brand new DME.
My $.02 worth.
After a LOT of methodical trouble shooting, I traced my issue to a failed DME. Replaced it with the new unit from Focus9, and it’s been running beautifully since.
You list DME in your list of attempted fix actions already. Whats the nature of this attempted fix? New? “Known good” replacement? I came to the conclusion that even a “known/tested good” DME is in the neighborhood of 3 decades old and, to me, not worth the gamble.
Not a cheap fix, but a fix backed up by peace of mind knowing that there’s a lot of new equipment in there now, to include an updated, brand new DME.
My $.02 worth.
10-16-2017, 05:34 PM
#5
Intermediate
Thread Starter
When u crank, does the rpm jump at all? If not, you should look into the SR sensor. I cleaned mine with degreaser and contact cleaner. Car started right up.
Just fixed mine today. Took 2 days and I replaced plugs, coil, dist cap. Was going to test the starter as next step too.
Just fixed mine today. Took 2 days and I replaced plugs, coil, dist cap. Was going to test the starter as next step too.