Question about 1996 Audi A4

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I have a 1996 a4 that has lost compression. The Timing Belt looks to be intact although I have not fully checked it to see if any grooves are worn off. Do you have any suggestions as where or what to look for?

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1996 was the year that audi had mega trouble with cambelt tensioners,the belt and tensioner should be replaced EVERY 60k
to avoid VERY large bills,(the engine WILL seize)if you have lost a tooth off the belt DO NOT DRIVE IT.GET IT FIXED,like, YESTERDAY....

Posted on Sep 02, 2010


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Why is there no compression in engine on my 1991 mitsubishi pajerno

This has to be because of a mechanical problem in the engine. Possible sources are the timing belt is broken (one indication is the starter spins the engine faster than normal, because the camshaft that opens and closes valves is not turning with the crankshaft), or the head gasket has failed (from overheating as the most likely cause), or badly worn piston rings and/or valves not sealing well (common on high mileage engines).
Compression is built up in the upper part of the cylinder where combustion occurs, so leaks or lost compression are due to valves not sealing, or head gasket that seals the cylinder head to the engine block-sometimes the aluminum cylinder head can warp due to overheating, and the head gasket no longer can maintain a seal. Or also the piston rings are worn so bad that compression will leak past them into the crankcase. For valves or head gasket, the cylinder head has to be removed and repaired. For the rings, the engine has to be rebuilt entirely.
First check if the timing belt is still intact.

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Well, During this time when you replaced the cam sensor and stuff did you check to see if the timing belt was still intact? Do a compression check to see if you've lost compression on any cylinders. If the timing belt broke this will be the case. Chrysler typically has a plastic cover that goes over the cam pulley end of the timing belt that can be removed, it also has a check hole, to check the timing belt as well.

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I have an Audi A4 that will not start. It cranks, it has spark, and there is fuel getting to the fuel injectors. For some reason, I do not think that they are firing. Any ideas. The spark plugs are...

jumped timing belt even by 1 or 2 teeth can cause this, try a compression test - if bad on all cyls then the belt may have jumped, or the v v t tensioner on the rear of the cams is jammed and not coming up under oil pressure while cranking, this throws the valve timing out also.

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1 Answer

96 Audi A4 Power Steering Problem

Hi Ya
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1 Answer

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It really does sound like the timing went out of whack. The timing belt should be replaced periodically, according to your owner's manual. It may have worn and stretched just enough to slip over a cog a bit. Remove the timing belt covers and check the alignment of your cam and crank. There should be subtle marks on the cogs and the rear cover or casting. The compression will be good during a cranking test, but will not be ok during a running compression check. Replace the timing belt and check the pulleys. If your timing belt did not slip, the timing chain tensioner or guide shoes may be worn and will require replacement.

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