1999 Suburban Strange Sound
May 23rd, 2017, 11:02 PM
#1
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1999 Suburban Strange Sound
1999 k1500 Chevy Suburban LS 350 V8 4wd. Bought from a neighbor who has since moved. Started making a strange sound....thought it was belt or pulley related. Changed the belt, Alternator, idler pulley and tension pulley.....no change. Removed belt, sound still there....so it's not belt or pulley related.....strangest sound I ever heard.
Video link:
Any idea on what it could be?
Thanks.
Video link:
Any idea on what it could be?
Thanks.
May 24th, 2017, 4:30 PM
#3
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I'll have to go through the warmup process to where it makes the sound, then remove the belt and see if it changes when I hit the throttle.
Last edited by BLP; May 24th, 2017 at 6:00 PM.
May 24th, 2017, 10:23 PM
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Good point....the sound seems to go away when I give it some throttle, but this is when the belt is on and with the fan running so it's a bit hard to tell.
I'll have to go through the warmup process to where it makes the sound, then remove the belt and see if it changes when I hit the throttle.
I'll have to go through the warmup process to where it makes the sound, then remove the belt and see if it changes when I hit the throttle.
Video link:
Last edited by BLP; May 24th, 2017 at 10:34 PM. Reason: Added video link
May 25th, 2017, 7:26 AM
#5
Ok, so it's probably not a mechanical noise in the engine, since it doesn't change pitch with engine speed.
Are you sure it's coming from the engine bay? I'm almost inclined to guess fuel pump, since it goes away with some throttle.
Try turning on the ignition (turn it to "run"), but not starting the engine. See if you still hear the noise.
Are you sure it's coming from the engine bay? I'm almost inclined to guess fuel pump, since it goes away with some throttle.
Try turning on the ignition (turn it to "run"), but not starting the engine. See if you still hear the noise.
May 25th, 2017, 10:37 AM
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Ok, so it's probably not a mechanical noise in the engine, since it doesn't change pitch with engine speed.
Are you sure it's coming from the engine bay? I'm almost inclined to guess fuel pump, since it goes away with some throttle.
Try turning on the ignition (turn it to "run"), but not starting the engine. See if you still hear the noise.
Are you sure it's coming from the engine bay? I'm almost inclined to guess fuel pump, since it goes away with some throttle.
Try turning on the ignition (turn it to "run"), but not starting the engine. See if you still hear the noise.
May 25th, 2017, 12:23 PM
#7
When you figure this out be sure to update. Did you check to see if the crank pulley is rubbing on something? Does it have a mechanical fuel pump? An exhaust leak? Intake leak at the air cleaner etc..?
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May 27th, 2017, 9:37 PM
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Step in the right direction?
Noise changes/disappears when I open the oil cap or remove PCV .... replaced PCV about 6 months ago. Seems like there is too much pressure in the engine.....any ideas? Thanks.
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May 28th, 2017, 4:28 PM
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PCV valve connects to?
1999 k1500 Suburban 5.7 4x4......replaced the PCV VALVE, no change......strange noise seems to be related to the "gizmo" that the PCV Line connects to......Haynes manual no help.....any ideas? Thanks.
Video Link:
Video Link: