Question about 1995 Ford Mustang

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Detonation problem with a 1995 Mustang 5.0

It accelerates fine under full throttle until it shifts into Drive and then it starts to ping hard. I've set the timing back to 10 degree's from 14 and it hasn't made any difference. I put a new 155 Lph fuel pump in a year and half ago but almosts seems like its gone again since it cranks over for a time before it starts. If I turn the key 3 times to prime the fuel pump then it starts right away. Wondered if you could confirm my fears that new fuel pump is gone already or is it a knock sensor or o2 sensor out of calibration. Look forward to your reply . Thanks Phil

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Hmm the 2 situations are related 4 degrees should have made alot of difference including bad starting it is a classic case of pre ignition is your fuel the correct octane value and unleaded
can you check the total advance of the dizzy as it appears you have full auto advance to early /weak or broken springs would cause this
when you have more than 1 problem as in this case it is vital that you correct the pre ignition first as the 2 problems will feed off each other chris (merlinv12)

Posted on Jul 11, 2008


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