Question about 2004 GMC Envoy

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To keep my car running efficiently when should I replace the timing belt?

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If your vehicle has the 4.2 liter engine, it has a timing chain, not a belt. if you keep up on your oil changes, it shouldn't require service. make sure to look after this engine well, if there is ever a timing chain issue in this truck, it is a very very large and expensive job.

Posted on May 13, 2010

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SOURCE: wont stay running

Could be get the specs and reset the timing. If it contiues then try working on the fuel filter or idle speed.

Posted on Apr 11, 2009

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How do I repair a broken timing belt?


This is a questioin with a few diffferent answers, but I will try to include as much info as possible.....you did not state which make.model or engine type you have...so the first and main thing to work out is ---- is this engine an interference type ??? this is to work out if the timing belt broke, would the valves hit pistons......if yes, then you might be loking at an enigne overhaul and repair $$$$$$$$......but if not, you might get anway with just replacing the timing belt......

If just replacing timing belt...again you ned to make sure you have capable and comprehensive instructions to set the belt up properly...the reason it is called a timing belt, is that it goverbs the timing of the pistons (crankshaft) according to the valve opening (camshaft) and spark timing.....get this wrong and the engine will not start/run or be efficient as it once was.......

First things first......work out what engine you have, and if it is just a timing belt replacement...and then go from there

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1 Answer

Cost of complete engine overhaul service


You might be better to get a used engine and have it installed. It would be more cost efficient. Labor to replace(with a new timing belt installed) is based on shop labor times about 5-6 hours. A lot of places who will sell engines often offer a warranty to go with it. An overhaul may run you in excess of $2000.

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I assume that you replaced the belt at 60,000 because that was the recommendation in the owner's manual. It needs to be done every 60,000 to keep the engine running fine so you should be giving serious thought to getting it done soon. Hope this helps.

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Could be get the specs and reset the timing. If it contiues then try working on the fuel filter or idle speed.

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Accelerating


once you change fuel octane it may run sluggish because the car is used to running at a better octane to run more efficient. go back to 93 and see if that may change it back to normal (note that it may take your car a few runs to get back to normal)

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Timing belt tension


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