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Oldsmobile Forum: Engine knocking noise during a cold start
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Old November 28th, 2014
gnx547 gnx547 is offline
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Engine knocking noise during a cold start

I bought a 95 Ciera with the 3.1 and the engine knocks during a cold start up. It sounds like lifter noise or piston slap but the noise does go away after it is warmed up. Is this normal?
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Old December 22nd, 2014
gnx547 gnx547 is offline
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No one here has this problem with the 3.1?
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Old February 7th, 2015
crash55 crash55 is offline
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if it shuts up after warm up it will last don't beat it & warm up before you drive. I have had motors go for quite awhile that way
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Old February 8th, 2015
1970cs 1970cs is offline
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Is the a new noise that just arose? Because those 3.1 injectors can hammer pretty when they pulse. I can hear my neighbors century from across the street on cold start up's.

Pat
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Old March 5th, 2015
Jacklane21 Jacklane21 is offline
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Very common to be piston slap in 3.1 engines. NORMALLY doesn't cause damage. Drain a quart of oil and put in a quart of DEXRON. I like walmarts brand, they even have Dexron VI for $4.50 or so. Doesn't need to be a fancy label, they all do the same thing: clean!!!

This will pump up weak lifter, and clean them if dirty. If the noise eventually goes away, you've done it! If not, piston slap.

The two sounds are very different though. Lifters are more tinny sounding, and slap is more of a knock.

GM indicates that this is not a reason for alarm, and will not do any warrenty work on such a sound under most conditions.
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Old December 7th, 2018
woodyBR549 woodyBR549 is offline
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Yes it is completely normal. One of mine does this and has for eight years. It has almost 392,000 miles on it. Back when these cars were new and under warranty, GM had a tech bulletin out on this very subject. If at any point in the test procedure the noise was still occurring after the prescribed time limit, GM would either repair the engine, or replace the engine. At NO cost to the owner. This information is out there, so feel free to look it up.
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