Engine squeals when started

Tiny
MONZA642000
  • MEMBER
  • MITSUBISHI
Ok, im extremely frustrated, I have a 1993 mitsu 3000gt non-turbo, 3.0 liter dohc front wheel drive with now 115000 miles. Recently I have updated the ac compressor and clutch, both accessory belts and serpentine about a month ago, also the acadjuster pulley and alternator idler pulley this is all brand new, for the first two weeks the engine ran without a squeal, then the ac compressor blew a seal and lost all oil so its been replaced again, and now the squeal is back. Its very constant and an odd matter is that is will go away after the engine has run for about ten or fifteen minutes a friend of mine is a mechanic and told me the alternator idler is bad its can be moved slightly side to side and its near impossible to figure which pulley is actually the problem, and the tension has been adjusted like 10 times in both directions. Nothing changes it one bit. My main question is how can I pin point it and how do you tell the difference in a belt squeal and a bad pulley, and if it is a bad pulley, why does the squeal disappear after ten minutes? If it was bad wouldnt it be all the time. And is it possible the a/c clutch is the problem? Please help its already costed me over 1000 dollars in upgrades and its still there. Oh and also, is it possible the timing belts could be the problem, cause as far as I know they are stock.
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Thursday, August 30th, 2007 AT 10:07 PM

3 Replies

Tiny
JACK42
  • MEMBER
They are probably seperate things, but at that mileage, I would have the t-belt replaced, that is an interference engine and if the rpm's are up when it goes it WILL be catastrophic. Try another belt, could be when the a/c oil blew out it contaminated the belt, but when it gets hot it grips again
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Friday, August 31st, 2007 AT 7:44 AM
Tiny
MONZA642000
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O. Kay then t belt is a sure thing then to come and also I have switched the accessory belt to test that, but the squeal is the same it seems to really sound like metal rubbing, and ive checked the mounting bolts and everything, because the longer you drive the squeal slowly disappears becoming slower and more infrequent. And I cleaned all the pulley surfaces with cleaner to remove any oil, is there a trick to testing a pulley for a squeal, and could a ac compressor clutch do this?
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Saturday, September 1st, 2007 AT 9:45 PM
Tiny
JACK42
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Removing the belt and turning the pulleys by hand is usually how you would find a bad bearing. Try removing the drive belt and see if the noise is still there, just to eliminate the possibility of it being a t-belt idler or tensioner
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Sunday, September 2nd, 2007 AT 6:57 AM

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