i took the heads off a nearly stock 91 mustang with 95,000 miles and all the exhaust valves are white as a ghost. the car seemed to run ok until you got past 4000 rpm and than it seemed to quit making power. some of the plugs were pretty white also. i know its a lean condition but wonder what caused it. i just started a h/c/i swap with this car and im just trying to figure out why it was running so lean
should have put a FP gauge on it and see if it lost FP with rpm's, could have been pump or regulator.
Fuel pressure? My valves were red as a crayon. HAHAHAH
Rob
1 Monte SS. White.
Banned dates
11/27/08
4/25/11
3/28/12
12/1/12
There are more but that's all that was logged!!!
Yep check for the proper fuel pressure under load. It would also be a great idea to check the WOT A/F ratio as well and report back or take it to a good dyno shop once you install the h/c/i etc!
Mark
LeMans Blue Z06
A buddies car wouldn't pull past 4grand and the fuel pump was going out. He changed pump and the car runs fine now.
they look a little red in the centersOriginally Posted by wick
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