4.2L 95 RRC
starts totally fine when cold. Once at operating temp if I shut it off and even immediately then restart- a second or less, will crank sometimes for 2-3 seconds, sometimes for 10-15 secs. Sometimes tries to stumble a little bit and eventually starts after sometimes 1 or 2 tries. Acts like it is fuel.
Fuel Pressure: 37psi on the nose. 1 psi drop after 5 minutes
Spark: Big and fat white spark when cranking with no start
Fuel Temp sensor: 515 ohms at 140*- in spec
Coolant Temp Sensor: 500 ohms at 160* - in spec
AFM brand new - old AFM did the same.
IACV: 58 ohms: in spec
TPS: no dead spots - voltage in spec in range.
Injectors: rail off with injectors for 5 minutes with pressure zero drips. Spray pattern good.
If I floor the gas while cranking it seems to start a little more quickly which leads me to believe it is too rich, which would make sense that it will be hard to crank so quickly after shut down as opposed to a few minutes like a dripping injector.
There is also a very slight hesitation, seems more ignition related perhaps a bad amp. Under light throttle accel there are tiny hesitations that can occur.
Brand new OEM cap and rotor, STI plugs and Champion coppers. Replaced amp, but not brand new anymore.
Grounds seems good, distributor ground is new. If I spray the amp with compressed liquid air, it does not improve anything.
Medium or full throttle no hesistations and pulls hard and smooth
Any direction on either? Ignition - I have had more than a few new OEM rotors and caps act up, and I don't mind throwing a new amp on, so keeps me up a little less. The long crank has me baffled.
starts totally fine when cold. Once at operating temp if I shut it off and even immediately then restart- a second or less, will crank sometimes for 2-3 seconds, sometimes for 10-15 secs. Sometimes tries to stumble a little bit and eventually starts after sometimes 1 or 2 tries. Acts like it is fuel.
Fuel Pressure: 37psi on the nose. 1 psi drop after 5 minutes
Spark: Big and fat white spark when cranking with no start
Fuel Temp sensor: 515 ohms at 140*- in spec
Coolant Temp Sensor: 500 ohms at 160* - in spec
AFM brand new - old AFM did the same.
IACV: 58 ohms: in spec
TPS: no dead spots - voltage in spec in range.
Injectors: rail off with injectors for 5 minutes with pressure zero drips. Spray pattern good.
If I floor the gas while cranking it seems to start a little more quickly which leads me to believe it is too rich, which would make sense that it will be hard to crank so quickly after shut down as opposed to a few minutes like a dripping injector.
There is also a very slight hesitation, seems more ignition related perhaps a bad amp. Under light throttle accel there are tiny hesitations that can occur.
Brand new OEM cap and rotor, STI plugs and Champion coppers. Replaced amp, but not brand new anymore.
Grounds seems good, distributor ground is new. If I spray the amp with compressed liquid air, it does not improve anything.
Medium or full throttle no hesistations and pulls hard and smooth
Any direction on either? Ignition - I have had more than a few new OEM rotors and caps act up, and I don't mind throwing a new amp on, so keeps me up a little less. The long crank has me baffled.