1999 Ford F-150 Repair Question
Mileage: 205,000 miles.
Why engine does not fire?
Asked by StokesAnswer
did youcheck for fuel pressure??
Roy
Yes.There is little or no fuel pressure but there is no fire going to the fuel pump>>>There is just no fire. I have disconnected clean/sprayed the main harness on the firewall with no positive results.
when you turn the key on, it will activate the pump for only 2 seconds. after that, it will turn on when the motor starts.
check the interia switch behind the right lower kick panel especially if had it towed.
Roy
Thanks>>>Have not been towed>>>But would the fuel pump being inoperable prevent getting fire at the coil and spark wires?
which motor do you have??
did you crank it long enough with a good ground on the plug to check it.??
Roy
The vehicle has a 4.6 engine and yes to the length of cranks.
it is rare for a no spark condition on the 4.6/5.4 series.
i would verify fuel pressure first with a gauge.
Roy
But there is NO spark, so what else? Could it be the cam sensor?
yes, it could but it would throw a code if it was. is there any codes?? if not, i am still going to refer back to fuel pressure as it is the first check in a diag after compression test.
Roy
Nothing is showing up on the codemachine. However I did put a live wire from a battery directly to the fuel pump wire leading to the fuel pump and did not hear the pump engage. If the pump is working would that generate fire/spark?
But my unlining question is why isnt there's fire from the coil and leading into the coil? Even if there is fuel would the vehicle start w/o spark? I am very thankful in your help>>>>Semper FI