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Author Topic: 2001 Pontiac Aztek 3.4 Strange knocking noise?  (Read 2347 times)
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« on: May 22, 2018, 09:12:35 PM »

So I recently purchased a 2001 Aztek with 131k and for some reason out of nowhere it started making some bad knocking noises almost like a ping and I can't tell if its bearings or maybe something top end?
Any advice would be appreciated

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Any car gets great mileage when you ride your bike

« Reply #1 on: May 25, 2018, 10:54:37 PM »

Well it sounds a lot like lifters.  Geez, that engine is dirty inside.. 

Here's the old fashioned repair, and this worked for me on mine when it started making that noise at 180K..  change the oil, and substitute one of the quarts of oil with Dexron ATF.  Drive it around for a couple hundred miles, then pour in a can of Seafoam.  Yes, pour it right into the crankcase.  Drive it around for a couple hundred more miles, then again change the oil.  It should stop making the noise at some point during this procedure-mine did.  This is the old fashioned way to free up a sticking lifter, which you hope is the source of that noise :-)

Be sure you are using Mobil-1 synthetic 5w30 oil.  And if this fixes the problem, again pour in a can of Seafoam just a few hundred miles before the 3000 mile engine oil change.  Which you should do if you want another 100K out of that engine.
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Mermaid with an Aztek

« Reply #2 on: May 26, 2018, 09:12:58 PM »

We've always put in a quart of ATF in place of a quart of oil in all our engines, particularly high mile engines. Our 200,000 mile minivan's 3800 is super clean inside.

2001 Steel Blue Metallic GT 1 of 1956 FWD blue GTs.
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