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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / December 2007timing belt?
can a stretched timing belt with 140,000 miles on it cause a car to backfire or pop at the tailpipe,even though the timing marks line up? also can this cause the timing on a scan tool to jump around? is there a sure way of telling if i have a bad computer,timing belt or distributor? thanks > can a stretched timing belt with 140,000 miles on it cause a car to backfire > or pop at the tailpipe,even though the timing marks line up? No, but it can cause a newsgroup participant to wonder what the HELL you're doing running a timing belt for 140,000 miles.  SignatureDec. 6 (Bloomberg) -- Government officials and activists flying to Bali, Indonesia, for the United Nations meeting on climate change will cause as much pollution as 20,000 cars in a year. well the car was running great until the fuel pump went. i am getting it changed because you are correct with your ? :-) >> can a stretched timing belt with 140,000 miles on it cause a car to >> backfire [quoted text clipped - 3 lines] > you're > doing running a timing belt for 140,000 miles. > well the car was running great until the fuel pump went. i am getting it > changed because you are correct with your ? :-) Might I ask where in Wisconsin you are? (my e-mail is valid) >well the car was running great until the fuel pump went. i am getting it >changed because you are correct with your ? :-) Okay, so think to yourself. What could the collateral damage from a bad fuel pump be? You could have dumped some debris from the fuel pump into the regulator. You could have stretched a marginal timing belt from the engine bucking. You could have damaged an engine mount and torn a sensor cable loose from the engine bucking. When you replaced the pump, did you check the rail pressure at idle with the new pump? I'd do that next, after changing the belt. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." check the compression. Poor compression in all cylinders would indicate a jumped timing chain. I guess it would indicate the same for a timing belt. Also if you just replaced the fuel pump maybe that's it. i think there are a lot of bad ones straight from the factory. check your fuel pressure. >can a stretched timing belt with 140,000 miles on it cause a car to backfire >or pop at the tailpipe,even though the timing marks line up? Yes, sure. >also can this >cause the timing on a scan tool to jump around? Sure. >is there a sure way of >telling if i have a bad computer,timing belt or distributor? thanks Not without replacing the timing belt, which you know is bad just from the fact that it has 140,000 miles on it. Fix that and you'll be able to start diagnosing anything else that might be wrong. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." thanks for the replies guy's. i had a bosch fuel pump put in because the parts house recommended it over a cheaper brand. i got this car back from a garage after a week and the owner said he ran all kinds of tests on sensors,cat converter, used a scan tool, etc. fuel pressure test, and all he found was the timing seemed to jump a bit on his scan tool. this has been going on for a month now and i don't know where to take it anymore. :-( >>can a stretched timing belt with 140,000 miles on it cause a car to >>backfire [quoted text clipped - 14 lines] > to start diagnosing anything else that might be wrong. > --scott >thanks for the replies guy's. i had a bosch fuel pump put in because the >parts house recommended it over a cheaper brand. That's probably good. >i got this car back from a >garage after a week and the owner said he ran all kinds of tests on >sensors,cat converter, used a scan tool, etc. fuel pressure test, and all he >found was the timing seemed to jump a bit on his scan tool. this has been >going on for a month now and i don't know where to take it anymore. :-( You could try the dealer. But what worries me is that if you have gone 140,000 miles without even changing the timing belt, what OTHER maintenance have you been putting off? --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis."
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