91 won’t stay running once it warms up
07-14-2018, 05:49 PM
#1
6th Gear
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Member Since: Jul 2018
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91 won’t stay running once it warms up
i have a 91 12k miles took it out for the first time in a year ran fine and would not start after trip to store
buddy towed it we changed fuel filter died once it got hot again
change fuel sending unit
same result it will start once it comes off of high idle it starts cutting out and dies it is not MPS
any help would be appreciated
buddy towed it we changed fuel filter died once it got hot again
change fuel sending unit
same result it will start once it comes off of high idle it starts cutting out and dies it is not MPS
any help would be appreciated
07-15-2018, 02:50 AM
#2
Intermediate
Fuel filter and sender unit isn´t affected by engine heat.
Is the ignition system in good condition?
It might be a worn out ignition coil. How old is it?
And the ignition module inside the distributor?
12k miles? Haven´t you used it?
My -90 is in the 120k range.
Is the ignition system in good condition?
It might be a worn out ignition coil. How old is it?
And the ignition module inside the distributor?
12k miles? Haven´t you used it?
My -90 is in the 120k range.
07-15-2018, 10:03 AM
#3
6th Gear
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filter and sending unit were replaced when issue first came up months ago
he heat isssue was not relized until recent attempts to drive
evertthing is original
07-18-2018, 03:14 PM
#4
Get an ice pack ready. When the car gets warm and dies ice the ECM down to cool it while the engine is still hot. If it starts after icing it could need an ECM rebuild. That's what my 93 was. Mine wouldn't ever die it just wouldn't restart while it was hot. Also sometimes when it was cold it wouldn't start and tapping on the ECM top would make it start. The solder joints shrink over the years. I had mine rebuilt last year for 160ish dollars and it hasn't died or not started since. Worth a try testing it.
Last edited by Natrlone93; 07-18-2018 at 03:15 PM.
07-18-2018, 10:07 PM
#5
Team Owner
How about you stop changing things and start diagnosing. When it happens, it is spark or fuel related. Can you restart it? If not, it is a perfect situation. You can check spark and fuel pressure and injector pulse.
07-27-2018, 07:51 PM
#6
Racer
Had a similar problem with a different car, cranksenor, spray it with eletronic cleaner n see if starts
07-27-2018, 10:21 PM
#7
Team Owner
07-27-2018, 10:48 PM
#8
Racer
Google for the location, no FRM?
07-27-2018, 10:52 PM
#9
Team Owner
07-27-2018, 10:53 PM
#10
Racer
Factory Repair Manual
07-27-2018, 11:03 PM
#11
Team Owner
07-27-2018, 11:55 PM
#12
Racer
Read the next thread, look at rockauto, but better yet look at the engine wiring diagram or forget it.
07-28-2018, 08:38 AM
#13
Team Owner
Sensors
07-28-2018, 09:20 AM
#14
Racer
I dont have the FSM, but if you google ,there is a diagram showing it at the flywheel end, I have a nissan frontier with the same setup, optispark n cranksensor, the senor on it times the fuel.
07-28-2018, 09:24 AM
#15
Intermediate
There´s no crank sensor in any of the C4:s (maybe exept for the ZR-1 engine, which I know very little about).
Edit: At least there´s no crank sensor on the L98 and I doubt that there´s one on the LT1 engine. //Edit.
The ignition and fuel injection has all the triggers it needs in the distributor.
And then there´s some senders such as throttle position, intake and coolant temp, MAP or MAF etc.
Edit: At least there´s no crank sensor on the L98 and I doubt that there´s one on the LT1 engine. //Edit.
The ignition and fuel injection has all the triggers it needs in the distributor.
And then there´s some senders such as throttle position, intake and coolant temp, MAP or MAF etc.
Last edited by Robban_C; 07-28-2018 at 09:27 AM.
07-28-2018, 10:55 AM
#16
Team Owner
Optispark is on the LT1 which is 92 to 96. Optispark is mounted on the front of the motor not the flywheel at the rear.
Last edited by aklim; 07-28-2018 at 11:04 AM.
07-28-2018, 06:36 PM
#18
Racer
07-28-2018, 08:03 PM
#19
Team Owner
07-28-2018, 08:05 PM
#20
Team Owner