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Old 05-03-2015, 11:50 PM   #1
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Low compression

I have a 2000 mustang gt ,I bought some pi heads and mild cams . I had it sent out to a machine shop to get some work done had it installed and it had a code for random misfire that wouldn't go away. I did a compression test and in cylinders 5-8
It had 100-110 on 1-4 I had 170 all across and it's running really rich . Anyone know what it could be ?

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Old 05-04-2015, 12:14 PM   #2
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Did you do a "by the book", accurate, compression test?

Can you go into a little more detail as to the work that you had done and any codes that you have?
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Old 05-09-2015, 12:56 PM   #3
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Any cylinder below 90 psi is bad , means your engine is more than likely gone , 100 psi is fairly normal but anything over 100 psi means your engine is ok

1998 GT, Edelbrock Victor Jr. Ford 4.6L SOHC, Edelbrock Fuel Rails, 1999 Gt Engine w/ PI Heads,Accufab 70mm TB & Plenum,Fuel Pressure Regulator 515 Series Inline Return Style, 25-90 psi, Underdrive Pulleys,MSD ignition coils ,4.10 gears,Diablo Sport Predator Tuner

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Old 05-10-2015, 02:47 PM   #4
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Low compression

Sounds like they didn't deck 5-8 or something... That's assuming of course you had it done.

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