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1991 buick engine knock

The engine knocks and is most noticeable when warm and idling. The knock sounds like it's coming from the lower part of the engine.

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  • 74 Answers

Sounds like connecting rod bearings i wouldnt suggest fixing it

Posted on Oct 30, 2012

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Posted on Jan 02, 2017

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SOURCE: 2000 jeep cherokee engine knock additional info

This could be a piston rod or, crank shaft issue considering the location of the sound.

Posted on Feb 15, 2009

husni_g2002
  • 112 Answers

SOURCE: 2001 Grand Caravan Loud Knocking Noise

big end or main bearing.

Posted on Jan 25, 2009

  • 7 Answers

SOURCE: 97 Honda Accord, 2.7L Engine Knock

you need to get your valve adjust by the dealer

Posted on Feb 09, 2009

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SOURCE: low oil pressure at idle

how low does the oil pressure drop?? is it below 40?

Posted on Mar 05, 2009

  • 1 Answer

SOURCE: engine knocking noise in 2000 saab 9-3 SE?

It's a common problem with these cars i am actually fixing mine as of now. That car is all about oil pressure and when it is low you'll start to get a tap and or what sounds like a knock due to the lifters not having enough pressure. Try taking your oil pan off and check your oil pick up line going from the oil pan to the turbo. A lot of times it gets a lot of sludge build up and makes the pressure little to none. If that looks clear check the slump inside the oil pan and see if that has sludge build up. Well hope this helped

Posted on Jul 23, 2011

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2 Answers

I have a 1991 gmc sierra and my oil pressure is dropping down to zero and it has began to knock it was not knocking or anything until i noticed my brake light was flashing now i reset the computer but


These symptoms usually mean you have a failed main or big end bearing in the engine. If it gets more noticeable as the engine warms up, that type of failure is even more likely. If the knocking varies with revs it is more likely a big end. You may be able to get the sump off without pulling out the engine, and do an inspection.

I can't think what the brake warning light would have to do with all that.

Jan 13, 2015 | 1991 GMC Sierra

1 Answer

1999 Firebird knocking then stall


Well CB....a knocking noise coming from the engine is never good news.

Typically any real ugly noise that stops an engine from running is catastrophic. With the info you provided...low oil pressure, excess oil in the pan, knocking engine sounds and a motor that will now, not turn over...sounds like a bent con rod caused by a failed main bearing.

1999 v6 pontiac exploded dia-homgkn40kjilovpbxhhmhqzq-1-0.jpg
The engine overheated so the first suspect is the cooling system, some engine designs require that the thermostat be installed with the vent or bypass hole in a certain position. Failure to position the thermostat properly can cause engine overheating.

Another cause of the dreaded knock is "Knocking and pinging" caused by a low fuel octane rating, carbon deposits on cylinder walls or incorrect spark plugs... all not good. I think you would have noticed if your motor was knocking and pinging for any extended period of time.

Excess oil in the pan gets frothed up by the crankshaft slapping it around and aerates the oil which decreases its shear strength, which is what keeps metal parts from contacting directly together.
This could ruin the main crankshaft bearings.

First thing I would do is remove all the spark plugs (to reduce engine compression) and place a socket on the crank pulley bolt and try to turn the engine over...you should be able to spin the crank....if you can't get the motor spinning..it's seized up.

Good luck !

Mar 07, 2017 | 1999 Pontiac Firebird

1 Answer

Continued knocking while driving. Seems to knock faster as I accelerate, but does not knock at idle in neutral, starts to knock when reviving at 2200 rpms


Well lift the car up and put it on drive wile you can hear what the knock is. See if is your engine or the transmission. And if ok check your spark plugs make sure you getting fire to them

Feb 26, 2013 | 2001 Volvo C70

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Sounds like a diesel on a cold day


could be a knock sensor or rockers knocking until oil warms up and oil pressure seals the lifters

Sep 27, 2012 | 1995 Chevrolet Silverado 2500

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Engine kept on stalling and blew oil all over the engine and leaking oil of the filter and now knocking sound when it cranks and shakes crazy? how can this fixed on a 1991 Buick riviera


Sounds like you have a front or rear oil seal gone.......A loss of oil will cause knocking and your crank bearings to go which will really knock....Hope this helps.

Jul 04, 2012 | Cars & Trucks

1 Answer

Knoke in motor @ high idle has no power. motor drags when try to crank warm


Would not be surprised you have found the answer before you read this.
Believe you have a bearing failed on your crankshaft. If it's a piston rod bearing, it won't be very long in your future before you find pieces of your lower engine block blown out and strewn on the ground. That's the worst case scenario. What makes the engine drag? Too much friction. But a warm engine should have less friction than a cold engine. Just the opposite in your case, and that's significant.. Have someone listen to the knock. Anyone who ever had that knock in their engine before the rod busted or the engine seized up will remember it. Good luck.

Jun 16, 2012 | 2006 Dodge Dakota

1 Answer

NOISE WHEN COLD THEN GOES AWAY WHEN WARMS UP,SOMEONE SAID MAIN BEARINGS GOING BAD


Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

Jun 14, 2011 | 1994 Pontiac Grand Prix

2 Answers

My car has a slight knocking sound coming from the lower portion of the engine, i think. It only does it when you hit the gas but not while cruising or in idle. However when the car is in park and i rev...


Sounds like the beginning of a rod/crank bearing problem. Clearances there are in the thousandths of an inch. At first, engine temp will cause clearances to close back up after it's warm but later on, clearances will become greater and this will become worse. Some shops will change your oil pump to increase pressure. This will not give anything but very short term relief as they are correcting the symptom, not the cause.

Aug 31, 2009 | 1992 Acura Integra Hatchback

1 Answer

I have a 2006 Dodge Durango. At 27,000 miles, it started stalling in traffic and the dealer replaced several sensors. The cam sensor was the last one to be replaced. Now at 72,000 miles, it has began to...


if there is a knocking sound the computer will start retarding the timing to get rid of engine knock thru the knock sensor. Make sure you are using the correct grade of fuel. it will be listed in your owners manual. the improper grade of fuel can cause detonation in your engine. giving a knocking sound. if the change in fuel doesn't help you may be looking at mechanical repairs. hope this helps. mike

Jun 16, 2009 | 2006 Dodge Durango

1 Answer

Engine knock


The idle issue is normal. The idle is controlled by the ECU. There are no adjustments for the idle. Regarding the knocking noise, that could be several things, and I am hesitant to comment without hearing it. Take it to a Toyota Dealer & have a tech listen to it. We are very good at identifying noises on the service drive.

Sep 08, 2008 | 2000 Toyota Corolla

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