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I have a 98 cutlass oldmoblie and when I turn on my car the motor or something is knocking what causes that?

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Need to find the spot where the knock is coming from..could be anything from a bad engine to a broken flexplate..(flywheel between the engine and the transmission..) repost findings..

Posted on Jan 21, 2013

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Posted on Jan 02, 2017

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My 98 jeep wrangler has a knocking coming from the motor. I have had some people tell me I need a motor and some say it something simple. And ideas, sure can't afford a new motor.


Very first thing you need to do is verify the actual oil pressure using a mechanical gauge. Lowest pressure at idle, with a warmed up engine would be 20psi. I'd rather see it at 30.
If the pressure is good, then you could have a valve lifter or rocker arm that has worn. Those cause tapping noise, not knocking. Knocking is usually caused by a worn rod or main engine bearing. When either wear, oil pressure gets lower (why I said to check that) Knocking can also be caused by an undersized piston or a cracked flywheel (common on automatics). Piston noise generally only happens cold and is much less common than it use to be in Jeep engines.
So, everyone that gave you info on your problem may be right...The only way to know for sure would be to have someone that is experienced and honest check it out for you. How expensive the repair is will entirely depend upon what the actual diagnosis is.

Jul 28, 2011 | 1998 Jeep Wrangler

1 Answer

Just had left/right struts replaced and now I hear this loud knocking noise (like something jumping around in the trunk) when I go over bumps or make a turn. What causes this?


Possible bushings (sway bar and suspension) if struts check out. Alot of times when you replace struts it amplifies existing worn bushings. Have struts rechecked and have bushings inspected.

Mar 02, 2011 | 1997 Oldsmobile Cutlass

3 Answers

I found a 1987 Oldsmobile cutlass supreme it has over 248000 miles on the car and i think has the original 307 motor in it. the motor sounds like it is knocking after you let the car warm up for a wile....


The car has near zero value,didn't you
check the blue book

Why would you need or even consider that,
or better yet ,you know what our anwer would
be

FORGET IT

You couldn't even do a ground up resto on that car

Feb 16, 2011 | 1987 Oldsmobile Cutlass Supreme

2 Answers

I pulled the motor in my 92 Oldsmobile Cutlass Supreme .It will not start. The trouble code is stuck on code 12.All the fuses have power .It turns over but there is no spark and the injectors do not open?I...


I have a 98 Chevy Astro but I'm guessing that you may have fried the computer because in the 90's that was how they were stopping car theft if you didn't remove the engine the exact way it was put in it could have fried the Computer (ECM)

Jun 22, 2009 | 1992 Oldsmobile Cutlass Supreme

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