- #43 of 105
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Re: 00 GMC JIMMY Alternator & Humming Noise Issues [mikesmith06]
by repairdog
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Aug 20, 2006 (1:20 pm)
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Replying to: mikesmith06 (Aug 20, 2006 11:06 am)
If you just replaced the alternator check the 2 pulley up front - the fixed idler and the spring loaded tensioner - all go by 100k so remove the belt and spin them and that should tell you.
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- #44 of 105
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Re: 00 GMC JIMMY Alternator & Humming Noise Issues [mikesmith06]
by repairdog
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Aug 20, 2006 (1:23 pm)
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Replying to: mikesmith06 (Aug 20, 2006 11:09 am)
If it did not do it before could be. Did you install it yourself and connect the main positive cable before the plug in connector so its polarized right. Is your battery good. 12.6 volts with engine off then 13.5 to 14 at idle from alternator.
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- #46 of 105
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Re: 00 GMC JIMMY Alternator & Humming Noise Issues [mikesmith06]
by weems2k
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May 02, 2007 (1:56 pm)
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Replying to: mikesmith06 (Aug 20, 2006 11:06 am)
Hey there. I have a 1998 Jimmy with the exact same problem. I had the battery replaced about a month ago, then about 2 weeks after that the same humming noise started. Along with the 12V at startup, then going up to 14 when I accelerate. I put on about 170000 miles on it before this started happening. Did you ever figure out what the fix for this was before I plunk down a bunch of $$$$. Thanks
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- #47 of 105
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Re: 00 GMC JIMMY Alternator & Humming Noise Issues [weems2k]
by jlflemmons
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May 02, 2007 (7:02 pm)
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Replying to: weems2k (May 02, 2007 1:56 pm)
Pull the alternator and have it checked. Sounds like a bad diode bridge which can take out the voltage regulator. These two things combined can take out a battery, too. An alternator with 100K should be considered a maintenance item. Bearings, brushes both will not be in good shape.
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- #48 of 105
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97 Jimmy rumbling/clunking upon acc
by 97jimmyco
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May 07, 2007 (7:39 pm)
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- #49 of 105
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97 Jimmy rumbling/clunking upon acc
by 97jimmyco
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Apr 18, 2007 (8:38 am)
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For the first 20 minutes of driving, everything appears fine. After that, when I acclerate from a stop light there is a rumbling/clunking noise possibly from the rear, its hard to tell, transfer case maybe? I have no idea. It makes no difference whether I'm turning, and appears to go away when i get up to speed. The longer I drive the worse it gets. Not so much around town, but highway for a period and then when i'm back in town its very evident. Any clues?
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- #50 of 105
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Re: 97 Jimmy rumbling/clunking upon acc [97jimmyco]
by repairdog
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Apr 18, 2007 (9:09 am)
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Replying to: 97jimmyco (Apr 18, 2007 8:38 am)
Got to pin it down closer. Rear could be calipers hanging up, rear diff (check gear oil level), u-joints, and then check trans fluid and front transfer case fluid, then the engine and front end open up many possibilities.
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- #51 of 105
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Re: 97 Jimmy rumbling/clunking upon acc [repairdog]
by 97jimmyco
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May 07, 2007 (7:39 pm)
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Replying to: repairdog (Apr 18, 2007 9:09 am)
Alright, the u-joints are fine, all fluids are topped off, the brakes are all good, just replaced the upper and lower ball joints, pitman and idler arms, tie rods are fine, fresh alignment, tires are a bit worn(but unrelated), could it be wheel bearings? Its not in the first 20-30 minutes of operation, but then after that its consistent after any stop and feels like the rear wheels just want to stop turning, like they want to catch and seize. The rear diff was low, but i did top it off. Help! I have to drive it to Oregon on Thursday!
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- #52 of 105
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1998 jimmy sle buzzing noise
by pinfish
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May 12, 2007 (3:55 pm)
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