- #31 of 105
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Re: undercarage noises [firstshirt1sg]
by lincoln6echo
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Jan 27, 2007 (12:04 pm)
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Replying to: firstshirt1sg (Jan 27, 2007 9:12 am)
maybe check to see if there is a heat shield on the cat. convertor. that maybe loose...and when you first start it up, the heat shieled may be rattling off of the catalytic convertor. It's happened to me like that. Try checking that maybe.
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- #32 of 105
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Re: Humming Noise [lincoln6echo]
by repairdog
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Jan 28, 2007 (4:43 am)
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Replying to: lincoln6echo (Jan 25, 2007 12:33 pm)
3 years/36,000 miles etc.
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- #33 of 105
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Re: undercarage noises [firstshirt1sg]
by repairdog
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Jan 28, 2007 (4:50 am)
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Replying to: firstshirt1sg (Jan 27, 2007 9:12 am)
Could be exhaust or you are lucky you have one of the 99-01 Blazers with secondary air injection that has a pump under the radiator that blows air into the exhaust each start for about 1 minute. Also has check valves on the exh manifolds that always internally fall apart and the L hoses (dealer only) burn thru. Look there. Then if a rattle/humming sound open the hood and look at the PCV on drivers side behind the air intake on the valve cover and feel the hose and see if its vibrating - due to throttle cable mount broken, clogged PCV, or vac leak. Next if lifter tap then after oil pressure comes up it stops - change filter and oil and see if that stops it and check the coolant levels cause this often is the first signal that the lower intake gasket is leaking Dex cool into the top of the engine. Hope that helps.
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- #34 of 105
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Hear sound when I turn wheel on my 97 jimmy
by 97jimmy3
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Mar 20, 2007 (12:42 pm)
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- #35 of 105
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Hear sound when I turn wheel on my 97 jimmy
by 97jimmy3
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Mar 15, 2007 (9:59 am)
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Hello, I am new to this forum. I just purchased a 97 GMC JImmy SLT and when I back out of my driveway and turn the wheel to cut my back end in the direction I wanna go, or if I am just making a random turn on a street, I get a bang or thump under the truck?? Any Ideas??
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- #36 of 105
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Re: Hear sound when I turn wheel on my 97 jimmy [97jimmy3]
by jlflemmons
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Mar 15, 2007 (7:25 pm)
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Replying to: 97jimmy3 (Mar 15, 2007 9:59 am)
Mileage would help here, but I will start the list with an idler arm in the steering.
2wd or 4wd?
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- #37 of 105
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Re: Hear sound when I turn wheel on my 97 jimmy [jlflemmons]
by 97jimmy3
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Mar 16, 2007 (4:12 am)
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Replying to: jlflemmons (Mar 15, 2007 7:25 pm)
Sorry about that. The truck is 4WD and has 71,000 miles on it.
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- #38 of 105
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Re: Hear sound when I turn wheel on my 97 jimmy [97jimmy3]
by jlflemmons
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Mar 16, 2007 (5:01 pm)
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Replying to: 97jimmy3 (Mar 16, 2007 4:12 am)
There are others here with more 4WD experience than myself, but if it is a constant sound while turning, check the CV joints. If a single clunk or bang type sound, go with idler arm, steering links, or possibly even ball joints. All of the above are pretty obvious when bad. I like to tell folks that if you can grab one wheel and move it without moving the other, something is hinky in the steering!
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- #39 of 105
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Re: Hear sound when I turn wheel on my 97 jimmy [jlflemmons]
by repairdog
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Mar 20, 2007 (12:42 pm)
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Replying to: jlflemmons (Mar 16, 2007 5:01 pm)
Normal thing is lower ball joints are bad. Then sometimes its the hubs going if more noise on a turn (jack up to determine). Then the hood hinge bolts can move and pop - gm has a little washer to add that fixes. Could be front stablizer bar mounts also.
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- #40 of 105
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00 GMC JIMMY Alternator & Humming Noise Issues
by mikesmith06
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May 02, 2007 (7:02 pm)
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