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 Post subject: 1979 Engine missing?
PostPosted: Wed Aug 04, 2010 11:31 pm 
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Joined: Wed Aug 04, 2010 10:20 pm
Posts: 6
Year and Trim: 1979 Pontiac Bonneville
My 79 Bonne is acting up it has started loping, kinda like it has a racing cam in it, or like it is missing on a cylinder maybe.

while i am idleing with the AC off it is fine it doesnt lope. if i have the AC on while idleing it is rough, shaking the whole car.
while im driving if i am acelerating it is fine, if i try to maintain a constant speed, it will run rough.

So far i have replaces the distributor cap, rotary button, wires, plugs. the fuel filter near the carberator, rebuilt the carberator, stripped it down to the block and cleaned everything. Replaced all the vacuum hoses.

i have also used a timing light to check timing, it is ok

any advice or suggestions would be appreciated.

and also does anyone know if there is a fuel filter near the tank on the frame? someone suggested checking this, havent had time to put it on ramps to look under it


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 Post subject: Re: 1979 Engine missing?
PostPosted: Thu Aug 05, 2010 12:02 am 
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Posts like an L67
Posts like an L67

Joined: Mon Mar 30, 2009 11:18 pm
Posts: 1254
Location: Zimmerman, MN
Year and Trim: before cars
I would suggest a compression test. Not to scare you, but V8's can hide a weak cylinder very well untill there is a load on it (lots of moving weight in there).


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