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Old 12-25-2016, 09:41 PM   #1
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2001 Silverado 5.3ltr shudder


Hello all, I have a 2001 5.3ltr that has begun to shudder while under low load, and in overdrive any speed, about 1100-1200 rpm. cleaned my throttle body of carbon from reg fuel, installed a new TPS about a month ago. any ideas guys ??

thx in advance
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Old 12-25-2016, 09:45 PM   #2
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Re: 2001 Silverado 5.3ltr shudder


What kind of shudder is it?
Engine, transmission, wheels, body?
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Old 12-26-2016, 06:27 AM   #3
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Re: 2001 Silverado 5.3ltr shudder


Every time I've developed a "shudder", it's been that it was running on seven cylinders.

Hold it, I lied, once a chunk of fan blade broke off and gave it a good shudder.

Out of balance condition.

Whoops, lied again, the other time was the rubber bushing in the drive shaft, hanger bearing, was toast and the drive shaft was jumping around.
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Old 12-26-2016, 08:34 AM   #4
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Re: 2001 Silverado 5.3ltr shudder


Yeah, and idler/Pitman/end links/hub bearing/locking caliper/slipping transmission.
So, back to my question?
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Old 12-26-2016, 10:37 AM   #5
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Re: 2001 Silverado 5.3ltr shudder


feels like an engine shudder gang. but, I take really good care of 30-40k priced vehicles. this one has 376k on it. 2 trannys, 1 rear dif, new throttle body, lubed religiously every 3k, sat radio (lol) When I'm on level ground cruising and press throttle lightly, it shudders. When I release throttle it stops. If I put it under heavy load,(passing gear) it doesn't shudder. could it be the throttle body again ? I still use regular fuel. Last cleaned in SEPT.

P.S. just got up here in TN was up really late. Mr. George Dickel and I had a wonderful time last night !!!
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Old 12-26-2016, 11:23 AM   #6
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Re: 2001 Silverado 5.3ltr shudder


Throttle body is not like a carb that needs to be kept almost spotless.
It's just a big air valve.

Check your spark plugs/wires.
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Old 12-26-2016, 11:24 AM   #7
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Re: 2001 Silverado 5.3ltr shudder


Quote:
Originally Posted by ukrkoz View Post
Yeah, and idler/Pitman/end links/hub bearing/locking caliper/slipping transmission.
So, back to my question?
Never seen half the things mentioned above shudder. Interesting.
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Old 12-26-2016, 11:27 AM   #8
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Re: 2001 Silverado 5.3ltr shudder


Does it do the same thing if you drop it out of overdrive (either by button or pulling selector down a notch). It might be your torque converter trying to lock up like it should but can't. How's your transmission fluid level?
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Old 12-26-2016, 11:41 AM   #9
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Re: 2001 Silverado 5.3ltr shudder


Quote:
Originally Posted by 123pugsy View Post
Never seen half the things mentioned above shudder. Interesting.
Yeah, you just read about GM truck death wobble. Took 3 inter related suspension and steering parts to fix it. On, surprise, 2000 Silverado with 5.3L Vortech - which is basically his car. So I sort of have 1st hand on this, you know.
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Old 12-26-2016, 11:45 AM   #10
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Re: 2001 Silverado 5.3ltr shudder


Quote:
Originally Posted by 123pugsy View Post

Check your spark plugs/wires.

Second this. You do not tell how many miles on your car. 2001? 15 yo, 15 x 12000=180 000?
Get truck some dark place, pop hood open, spray soapy water onto wires. Hear any crackling? There you are. Leaking wires will give you hell of shudder.
Next. If it's consistent with speed, I'd go for hub test. Is it tracking straight or snaking on the road?
Next. Power train mounts.
Fuel supply.
Can you reproduce that shudder with truck NOT MOVING? Simply held at those rpms? If yes, it's engine/transmission. If no, It's drive train. Hubs, all the good stuff I mentioned.
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Old 12-26-2016, 11:46 AM   #11
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Re: 2001 Silverado 5.3ltr shudder


thx lenaitch, Fluid level full and no burnt smell at warm idle pard. thought that might be prob, but not an issue. actually haven't used selector to test yet. great idea though !! thx get back to ya soon And, thx ukrkoz doesn't appear when not in gear.
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Old 12-26-2016, 12:08 PM   #12
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Re: 2001 Silverado 5.3ltr shudder


I think it might be important to determine if the shudder is related to vehicle speed, engine speed or drivetrain speed. I'm little help in providing answers to the answer but others no doubt will.
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Old 12-26-2016, 12:10 PM   #13
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Re: 2001 Silverado 5.3ltr shudder


UKRKOZ feels like an engine shudder gang. but, I take really good care of 30-40k priced vehicles. this one has 376k on it. 2 trannys, 1 rear dif, new throttle body, lubed religiously every 3k, sat radio (lol) When I'm on level ground cruising and press throttle lightly, it shudders. When I release throttle it stops. If I put it under heavy load,(passing gear) it doesn't shudder. could it be the throttle body again ? I still use regular fuel. Last cleaned in SEPT.
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Old 12-26-2016, 01:51 PM   #14
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Re: 2001 Silverado 5.3ltr shudder


Ayuh,.... If ya think it's the motor skippin',.....

How long has it been since the spark plugs have been changed,..??
Do a compression test while yer changin' the spark plugs,....

A compression test is a Great way to determine the motor's general overall health,.....
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Old 12-26-2016, 04:13 PM   #15
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Re: 2001 Silverado 5.3ltr shudder


If you can avoid the clutter and get to the individual exhaust manifold connections, take their temperatures at lo idle and again at hi idle to see if one or more cyls may be sick with low temperature.
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