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07-05-2008, 09:48 AM
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Misfire and CEL issues
My 07 has started to have CEL misfires showing up, power is robbed w cylinders down. Only 4000 miles on this car. Took the car to the dealer, they replace the plug in Cyl 08, and after 20 miles, back again.
In checking out threads on other sites, this appears to be a wide spread problem. Anyone else had to deal with it and what is the cure?
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2007 Roush Mustang Convertible, Stainless Works Headers, H Pipe, Procharger and Hurst Shifter  2006 Pontiac GTO, Automatic w CAI 
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07-07-2008, 08:05 AM
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I had a miss with 1450 miles. Dealer checked everything and ended up changing all the plugs. As with yours, the miss came back the day after I picked it up. This time they had it three weeks. They could not identify any problem. Finally, Roush sent a new pcm. Haven't had a problem since, about 350 miles since I picked it up. Keeping my fingers crossed
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 ARH longtubes and x pipe, Roush O/R's, 73mm pulley, WebElectric sequential taillights
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07-07-2008, 12:26 PM
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Plug shorting due to damage (improper installation/shipping damage causing a crack) or additive fouling have been a commonly discovered issue with these special 3v plugs in supercharged use.
Using well checked plugs at a reduced gap with clean gasoline is a solution.
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07-07-2008, 07:39 PM
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I threw a lean fuel bank,misfire and 0x2 code today. Taking to dealer in the morning.
__________________
2007 Roush Mustang Convertible, Stainless Works Headers, H Pipe, Procharger and Hurst Shifter 2006 Pontiac GTO, Automatic w CAI
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