- #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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- #53 of 105
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1998 jimmy sle buzzing noise
by pinfish
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Apr 14, 2007 (7:49 pm)
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i own a 1998 jimmy sle and i hear a buzzing noise coming from it sounds like under my vehicle.any ideals on what it might be,its driving me crazy.thanks for the info.
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- #54 of 105
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Re: 1998 jimmy sle buzzing noise [pinfish]
by repairdog
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Apr 15, 2007 (3:37 am)
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Replying to: pinfish (Apr 14, 2007 7:49 pm)
3 common things are the hazard/flasher relay behind the glove box, the heat shield on the cat converter, and the most common is the PCV on the drivers side valve cover. The PCV may be dirty so replace it or the throttle cable has a broken plastic tie on the rear of the upper intake so it now contacts or rests against the PCV so resesure with a plastic zip tie to the little bracket on the intake (was a push pin type on the cable) - common after any work on the intakes and really annoying. Good time to check the vac lines that T off the PCV area and run over to the drivers side - 5/32" vac hose and always rot out - your hands will be very dirty when you touch them (heat destroys them).
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- #55 of 105
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Re: 1998 jimmy sle buzzing noise [pinfish]
by angieandrohan
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May 05, 2007 (11:54 am)
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Replying to: pinfish (Apr 14, 2007 7:49 pm)
You said the buzzing sound comes from under the truck but you did not mentioned if it was under the hood or under the truck itself, if it's under the truck close to the rear wheel on the driver side that is the fuel pump if it's making an horrible buzzing sound maybe it's time to change it, if it's under the hood, then check all vacuums hose and PCV Valves, also check every relays. 
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