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#1
02-09-2010, 06:21 AM
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74 Grandville running rough
I have a 74 Grandville with a 455 with a Rochester Quadrajet carb. The car has 120K miles and it runs great "EXCEPT" after I have drove it long enough for it to get warmed up it runs rough, it loses power, backfires, won't idle and acts like the choke has stuck closed. I assume the problem is in the carb which was rebuilt July 1997 at 107K miles I just installed a new fuel pump and fuel filter but it didn't help. The plugs are clean and pulling off plug wires while the engine is running does not cause it to run rough like when I am driving it.
Do you have any suggestions what the problem might be? Is it an expensive fix? 
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#2
02-09-2010, 08:12 AM
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Re: 74 Grandville running rough
It COULD be the carb. "Backfire" is usually a lean condition, though, not a rich one.
A compression or leakage test is called for to determine exactly the condition of the engine. With that many miles, it's possible there's a problem with the valves. Not uncommon for a high-miles EGR engine to "burn" an exhaust valve. Do the tests and report back. Jim
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