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#1
10-20-2022, 08:25 AM
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Engine vibration
I have the above symptoms on my 01 4.4 and I’ve narrowed it down to either the AC compressor, belt or tensioner as when I turn off the climate control it smooths out. I plan to have both belts, tensioners and ac compressor replaced soon anyway but just wanted to know if anyone else has had ‘auxiliary belt vibration’. I did find a post on a LandRover forum where a guy had mentioned the same thing. Interesting. 
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#2
10-20-2022, 09:46 AM
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I recall reading more than a few posts about AC compressor bearings failing, and since it goes away when you turn the AC off, I'm betting that is your culprit. I've had tensioner pulleys and bearings fail over the years and mine tended to go out spectacularly, followed very quickly by a belt departure.
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Current Original owner 2002 E53 X5 4.4i to 4.6i swap 2026 G80 M3 6 spd 2025 G06 X5 50e Former 1972 Audi Fox 1986 Saab 900S 1996 BMW Z3 1998 BMW E36 M3 Sedan 2004 BMW E46 M3 2006 Audi A3 Quatro 1993 Mopar 318 Jeep Grand Cherokee 2015 V6 Jeep Grand Cherokee
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#3
10-20-2022, 11:10 AM
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Check motors mounts as every vibration will loose its isolation as the mounts deteriorate.
__________________
 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green
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#6
10-21-2022, 04:19 PM
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Well the AC cannot be on if the climate control is not on. So the noise is present anytime the climate control is on regardless of whether the AC is on?
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2003 3.0 5MT Topasblau Purchased in 2016 and sold in 2024 2012 35d Platingrau
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#7
10-21-2022, 11:33 PM
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If I switch off the ac it smooths out. If I use the fan speed control to turn the fan off (and ac) it smooths out.
Even the wife said the other week that the engine was 'racing' at idle. And she hasn't got a clue about cars.. The AC compressor must be putting more load on than normal even though it idles at the correct rpm with it on. When it's off the idle speed drops a bit and feels better. When the compressor is off I'm going to take a look inside it I think.
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#8
10-23-2022, 05:03 AM
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I can imagine the AC compressor gets shut off if you turn the fan off... My guess would be your AC compressor has a problem.
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