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Re: Horrible grinding noise at start-up Posted by Ari [Email] ![]() ![]() In Reply to: Horrible grinding noise at start-up, Bill Driver, Tue, 27 Sep 2005 17:21:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Unlikely it's the turbo - it barely spins at all, if any, at startup, and even if it were siezed, the engine would still idle fine.
An easy way to tell if it's the AC is to simply leave the AC button in the OFF position. The outer portion of the pulley will still turn, but the clutch won't pull in and the compressor won't be driven.
It wouldn't necessarily cause the engine to slow, but I'd check the harmonic balancer, also known as the main pulley. It's a sandwich of an inner and outer pulley, with rubber in the middle. If (when) the rubber fails, the pulley starts to come apart. They tend to squeal like mad when the engine first starts, then quiets. It is more of a squeal than a grind, but if the pulley drifts far enough, it starts chewing into the face of the oil pump. To check, crawl under the car at the firewall end, and find the main pulley (biggest, lowest). It's actually two pulleys. Draw a line across the top, where the two pieces meet. Then start the car a few times. Look for the line again. If the line is straight, the pulley is OK. If the line has shifted, the pulley is bad. Also, just look at the pulley for signs that it is blowing chunks of rubber. If the belts are badly misaligned, that would do it, too.
Other thoughts - with a cold engine, reach under the exhaust manifold and see if you can move the starter. I once had a started that got loose because the retaining bolts were backing out - it made some pretty impressive sounds. It also made noise going around corners one way.
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