Question about 2000 Pontiac Bonneville
Car coded yesterday p0303 which said misfire in cylinder 3. if you cold start car it runs fine. But if you stop and restart it idles rough, runs crummy and then the check engine light flashes. recently replaced plugs, wires and coil packs..All help appreciated.Thanks.
The only thing left is the injector or a vacuum leak on the manifold gasket sucking air in and causing a lean condition. Thats is its the only common issue providing you dont have a head gasket issue leaking coolant on that cylinder and the compression and valves are not leaking. The old spark plug should show a coolant issue if present. The white part will be shiney if you have a coolant loss. If the coolant is looking real dark you should have the cooling system checked for gas being pushed into the cooling system on compression stroke thru the head gasket.
Posted on Nov 12, 2009
Try checking the knock sensor and clean the throttle plate inside and out and also the back of the throttle plae, many times the plate sticks from back firing that you can't detect by ear or feel. Also could have a plugged cay.
Posted on Nov 12, 2009
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Posted on Jan 02, 2017
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