2007 Aveo5: Cylinder 2 Misfire

[jonelledge]

mine just gave me a multiple cylinder misfire, but seamed to loose quite a bit of power, while it was making a clanking noise. decided to find the noise. after 30 min of tearing the car down to expose the timing belt, turns out that it jumped time 1 tooth causing it to loose power. but the automatic tentioner broke (from what i hear it is fairly common) causing some slack, but the belt was replaced 20,000 miles before. but among other problems the mechanic that my mother-in-law (her car at the time) she took it to decided to some how to strip the threads on 2 of the bolts that holds the tentioner on, (3 holds it on) and the other 2 were loose causung it to move. and i guess break? anyways i replaced the belt and tentioner, making sure it was back in time right, threw the car back together in about 30 min or so and started up, ran just like it did before all that happen. one of the bolts that backed out was vibrating against the belt(slowly shredding it) while making all kinds of clanking noise when it was accelerating. but if you tentioner is broke, it might not be making noise. just something to check, if it is what it is it could save you a motor replacement. hope this helps you. ( im changing the timing belt my self from now on)

[avguy]

mine just gave me a multiple cylinder misfire, but seamed to loose quite a bit of power, while it was making a clanking noise. decided to find the noise. after 30 min of tearing the car down to expose the timing belt, turns out that it jumped time 1 tooth causing it to loose power. but the automatic tentioner broke (from what i hear it is fairly common) causing some slack, but the belt was replaced 20,000 miles before. but among other problems the mechanic that my mother-in-law (her car at the time) she took it to decided to some how to strip the threads on 2 of the bolts that holds the tentioner on, (3 holds it on) and the other 2 were loose causung it to move. and i guess break? anyways i replaced the belt and tentioner, making sure it was back in time right, threw the car back together in about 30 min or so and started up, ran just like it did before all that happen. one of the bolts that backed out was vibrating against the belt(slowly shredding it) while making all kinds of clanking noise when it was accelerating. but if you tentioner is broke, it might not be making noise. just something to check, if it is what it is it could save you a motor replacement. hope this helps you. ( im changing the timing belt my self from now on)

Got me scratching my head there jonelledge. If 2 out of the 3 tensioner bolts were stripped (spinning), how the heck did it manage to go 20K miles with only 1 bolt torqued down solid? The parts outfits who ship the timing belt kits include a warning about getting the tensioning procedure exactly right, so it's hard to imagine how it could even run at all with a tensioner moving around. And how in the world does a professional mechanic strip TWO bolts? Stripping just one would make me want to wet my pants, so I can't imagine anyone making this mistake twice. Maybe I'm just not understanding what you're saying. How did you fix the stripped bolts - cut new threads for the next larger bolt, helicoils, or some other way?

[jonelledge]

im not sure the belt nearly fell off when we removed the cover it was that loose. and yeah it says to go all the way tight, the let the tention of slowly untill it reaches the center mark. (not sure they did that). live in a town with just under 2,000 people and youll understand """""professional mechanic"""". im a small engine mechanic, utv atv golf carts go carts weedeaters chain saws dirt bikes and mowers, so im aware of how things work, i could maybe understand 1 bolt, MAYBE! but 2!?!?!?! NO!! but anyways i drilled the 2 holes on the tentioner bigger to fit a bigger bolt, and i tapped the block to take the bigger bolt and the A LOT of LOCK TIGHT!!!! ive got just a little over 6k on it since i have done that, so its getting about time for me to check and make sure everything is nice and tight.

guess im just lucky that the belt didsnt come off, one of the bolts was rubbing the belt, slowly shredding the belt, and it was so bad that litterly half of the bolt head was gone!
dont trust anyone but yourself, its sad that thats what the world has gone to.