Thread: what is a burnt valve?

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Originally Posted by Don Shillady

Thanks DennyW! I would never have thought of the Cat but I know we need to check the fuel pressure. Maybe replacing the FI pump is a good idea anyway with 85,000 miles on the car. Any body else have an idea? DennyW usually has it dialed in and he may be the smartest guy in Illinois! I wish he was closer!

Don Shillady
Retired Scientist/teen rodder

Don, I agree with Denny. Put the vacuum gauge on it and go for a ride down the highway. If vacuum slowly moves lower and lower I think you'll find your problem in the exhaust system. The 2 things I've seen most are a failed (plugged) converter and more rare but it happens, a collapsed pipe. I've seen a few pipes that have a inner pipe and it expands inside the outer pipe, without any room to expand, it collapses into the pipe interior, effectively blocking off any flow. No flow out = No fuel in.... I think you'll find your problem by measuring the vacuum. My 2 Cents! LOL