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Bad Mileage and Fouled Plugs



 
 
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Old March 11th 05, 04:03 AM
bob
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Default 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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