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Car back fires a lot when accelerating, change the plugs and is good for 2 weeks
1999 Chevrolet Cavalier

Car back fires a lot when accelerating, change the plugs and is good for 2 weeks

(1999 Chevrolet Cavalier)
Plug change will let car run great for about 2 or 3 weeks then starts to Miss and back fire again, have gone through 24 plugs in the last six months, they are the correct plug for the car, have tried others as well and do not get as long of use out of them. Have changed wires and coils as well, am at point plugs are more expensive Than the fuel to run it. Car is serviced regular,
1 answer & 3 comments
Popular Answer
of Greg's Orange Auto on October 10, 2012
have you done a compression test
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on October 10, 2012
No I have not done a compression test! May be that's what in need to try next it's just weird how it works fine for when the plugs are new for a couple weeks. It also runs fine on gas when I am having the issues with the back firing, if I remove the fuse to shut the CNG off it runs fine.
of Greg's Orange Auto on October 11, 2012
you may have a heat exchanger issue or and elect issue to cng system
on October 16, 2012
I can remove the fuse that controls the cng and start the car and let it run for a minute or so then turn the car off and then put the fuse back in and it will run fine on natural gas, it does sound like it has a miss when first starting it on gas but clear up.
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of Greg's Orange Auto on October 10, 2012
have you done a compression test
Sign in to reply
on October 10, 2012
No I have not done a compression test! May be that's what in need to try next it's just weird how it works fine for when the plugs are new for a couple weeks. It also runs fine on gas when I am having the issues with the back firing, if I remove the fuse to shut the CNG off it runs fine.
of Greg's Orange Auto on October 11, 2012
you may have a heat exchanger issue or and elect issue to cng system
on October 16, 2012
I can remove the fuse that controls the cng and start the car and let it run for a minute or so then turn the car off and then put the fuse back in and it will run fine on natural gas, it does sound like it has a miss when first starting it on gas but clear up.

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