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Registered
Join Date: Jul 2006
Location: Corona
Posts: 18
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erratic idle
I recently replaced my timing belt and now the car idles erradically. I dosent over heat or seam to fire wrong but there is a definite vibration through out the car. Its worst at its lowset idle point and seams to be most smooth out at about 3000-3500 RPM (but not completely). The manual Im reading says I need to take the car to a dealer to get the belt correctly tentioned. If the belt was not at the right tention or the balance shafts were incorrectly placed could this bring out a nasty vibration? Will having the belt professionally tentioned fix the problem? To get the belt tight all I did was release the belt tentioner completely till the belt was really tight, and TDC is right on.
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86 Ford Bronco 87 Porsche 924S 98 BMW 318ti 01 VW Turbo Bug |
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09-07-2006, 10:42 AM
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Registered
Join Date: Sep 2005
Location: Royal Oak, MI
Posts: 1,305
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Yes, if the balance shafts are not correctly timed you can have some ugly vibrations. When I got my 924S, they were off; didn't know till I went in and replaced the belts. I re-zeroed the balance shafts, and was completely blown away by how much smoother the engine ran! Not just idle, but at the higher speeds too.
You might try re-timing the balance shafts only; that's what I'd recommend.
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Vaughan Scott http://www.vaughanscott.com http://www.924.org |
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09-07-2006, 10:49 AM
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Cars & Coffee Killer
Join Date: Sep 2004
Location: State of Failure
Posts: 32,246
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Could be balance shafts, idle stablizer, or bad engine mounts...
Considering that the balance shaft belt was removed to do the timing belt, this is probably the culprit.
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Some Porsches long ago...then a wankle... 5 liters of VVT fury now -Chris "There is freedom in risk, just as there is oppression in security." |
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09-07-2006, 11:27 AM
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