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Incomplete combustion
does it try to start?? backfire?? anything?? need more info..........
The timing of the engine is off or the spark plug wires have been hooked up incorrectly.
try haynes
Its either too much fuel coming from the carbeuator and causing it to backfire or it could be spark plugs wired wrong. try to be more specific on where backfire is coming from. either out of the carbeuator or the tailpipes.
Does it backfire? Check timing. as well as Check that which controls the idle. Does it backfire when you try to start it after it dies? check the computer for coades and check all vavume lines and wire conections Control module and coil are the common ones.
bad compression
Like if you and your girlfriend or boyfriend break up then they going to try to find somebody like your friend and try to backfire you and say now look who I got she's prettier he handsome than you and then that's not going to be right cuz it's going to be really rude and stuff so that's a definition of backfire.
Either the timing or firing sequence is wrong. Go back and check everything.
I'm assuming since you say backfire it's carbed, so I'll also assume it's not computer controlled and has a standard hei or points distibutor. Hard starting and back firing are probably caused by over advanced timing. Try rotating the distributor.
hi , try www.crazyleds.co.uk, Ive got mine dash on 03 vectra done nicely ;-) chers
try some dry gas