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99 GMC Suburban, Clunk and Hesitation at 43-45 mph
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Barbara62572
Anonymous Poster
barbara62572@yahoo.com
May 5, 2009, 2:22 PM
Post #1 of 5
(2734 views)
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99 GMC Suburban, Clunk and Hesitation at 43-45 mph
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Hi, I have a 99 GMC Suburban that I'm hearing a clunk and feeling a hesitation as I accelerate from 43-45 mph. Sometimes the clunk and hesitating lasts from 40 all the way to 50 mph. The clunk is coming from under the hood in front of the drivers side.
I'm not sure if it's engine or transmission, so sorry if I posted this in the wrong place. I recently started taking it on the beach 4 wheeling. Not sure if that helps. Any help would be appreciated 
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 5, 2009, 6:43 PM
Post #2 of 5
(2724 views)
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Re: 99 GMC Suburban, Clunk and Hesitation at 43-45 mph
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Hi,
This place is fine. It's a tough call as to what that might be? That's about the area it would be locking the transmission for overdrive and that could be the issue. Doesn't usually happen at higher speeds but driver's side motor mount comes to mind too as the engine should have a lifting force on that side with power applied.
This may need to be witnessed by a tech to nail down. Rule out anything loose underhood for now - chiefly I'm lost as what else to suggest,
T
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Guest
Anonymous Poster
May 6, 2009, 4:03 PM
Post #3 of 5
(2719 views)
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Re: 99 GMC Suburban, Clunk and Hesitation at 43-45 mph
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Thanks for the response! The motor mount is fine. I think this is sand related. I lost my break lights today, and my husband is out their fixing it right now. Somehow sand managed to get into the break switch area. Unfortunately this has prevented him from checking out the other problem as he was going over the wires till he found the sand in the break switch, and it was time consuming.
As for the original problem that I posted about; now I'm starting to feel that bump and hesitation at all different speeds. Something tells me it's also sand related. I'll bring it to the mechanic tomorrow, and I'll post whatever the problem was in case anyone else ever encounters something similar.
Thanks again :)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 6, 2009, 6:24 PM
Post #4 of 5
(2710 views)
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Re: 99 GMC Suburban, Clunk and Hesitation at 43-45 mph
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Just tweaked my curiosity - was this car ever submerged in water? Generally sand or real dirt doesn't get near a brake switch!
T
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bikergman
Anonymous Poster
bikergman@hotmail.com
May 13, 2009, 10:54 AM
Post #5 of 5
(2693 views)
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Re: 99 GMC Suburban, Clunk and Hesitation at 43-45 mph
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I was wondering what the mechanic told you on the hesitation issue. I have exactly the same issue, and cannot get a good answer thanks Paul
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