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Bad Mileage and Fouled Plugs
"bob" > wrote in message ... > Looking for advice. Having problems with 1970 Coougar w/351c. It is hard > to start and uses lots of gas (<9.something mpg in city, used to 12 or so). > When strarting cold, it appears to flood easy as you can smell gas at tail > pipe. Recently put kit in carb trying to fix this and found float orings > pretty much gone (crumbled when removing) but can't say much improved. > > Changing the plugs helps with the starting for a while but not long. Pulled > plugs and the front 4 (1, 2, 5 and 6) are black with soot but other 4 are > ok. This is after about 500 miles on new plugs. The motor was rebuilt > about 10 years ago with a used alum edlebrock dual plane intake and 600 cmf > Holley 4bbl. There are no vacuum leaks to the outside along the intake to > head seams. Don't think there are any other vacuum leaks. > > What would cause the front 4 plugs to run rich but the back 4 be OK? I'm > 99% sure cylinders 1,2,5 and 6 are not on the same side of the dual plane > intake so does that elimnate the carb having a problem left to right? I'm > tempted to get a new carb but would like some confidence that will solve the > problem. Since the carb rebuild, there is a flat spot in the throttle when > you accelerate hard. Probably just the accel pump not set right but maybe > another symptom. > > Any advice appreciated. I will try to post pictures of the 8 plugs later. > thanks, bobby > bbusselmanCoyote at hotmail dot com (remove the dog to send email) > Forgot to add that I have opened the choke wide open a month or so ago and still floods easy. thanks bobby |
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