Please help me diagnose my dieseling problem
08-12-2008, 06:31 PM
#1
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Please help me diagnose my dieseling problem So, here is the deal:
New 383 lt1 - all new components - see details in sig.
I have an intermittent dieseling problem.
I have read some other threads - they suggest the root cause could be timing, bad injector, or a bad fuel pressure regulator.
My injectors are new. My aeromotive FPR has about 10k miles on it.
My timing is not that aggressive, about 2 degrees above stock, so i don't think that is the problem.
Here are my symptoms:
1. Smell fuel at time car is shut off (but no sign of fuel leak)
2. Dieseling is intermittent - maybe 1 out of 10 times i shut off car. A little more frequently if car is hot (~210), but not always, and not only if car is hot.
3. Fuel pressure control is fine - except when i have less than 4 gallons gas - then, going around corners, fuel pressure will drop very low (from 42lbs to ~20lbs). >4 gallons in tank, fuel pressure is solid.
I am leaning towards a bad fuel injector, but would love some input before I get to fix'n..........
New 383 lt1 - all new components - see details in sig.
I have an intermittent dieseling problem.
I have read some other threads - they suggest the root cause could be timing, bad injector, or a bad fuel pressure regulator.
My injectors are new. My aeromotive FPR has about 10k miles on it.
My timing is not that aggressive, about 2 degrees above stock, so i don't think that is the problem.
Here are my symptoms:
1. Smell fuel at time car is shut off (but no sign of fuel leak)
2. Dieseling is intermittent - maybe 1 out of 10 times i shut off car. A little more frequently if car is hot (~210), but not always, and not only if car is hot.
3. Fuel pressure control is fine - except when i have less than 4 gallons gas - then, going around corners, fuel pressure will drop very low (from 42lbs to ~20lbs). >4 gallons in tank, fuel pressure is solid.
I am leaning towards a bad fuel injector, but would love some input before I get to fix'n..........
08-13-2008, 02:56 PM
#2
Pull the rail with the injectors in tact and pressurize the system (turn the key to on) and see if any injectors leak) this really sounds like a leaky injector leaving gas in the motor after turn off. Also have you had it tuned for the injectors as you sound as if you are running really rich.
08-16-2008, 08:33 PM
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Pull the rail with the injectors in tact and pressurize the system (turn the key to on) and see if any injectors leak) this really sounds like a leaky injector leaving gas in the motor after turn off. Also have you had it tuned for the injectors as you sound as if you are running really rich.
