TRUCK HAS 240,000 MILES BEEN A GOOD TRUCK STILL RUNS STRONG JUST A LITTLE OIL AROUND VALVE COVERS DOES NOT SMOKE OR CONSUME OIL. NEEDS SOME SPARK PLUGS AND WIRES HENCE THE CODES IT GAVE ME. WONDER IF I SHOULD START BY REPLACING BELT TENSIONER PULLY AND IF THAT DOESNT WORK TAKE OIL PAN OFF AND SEE WHAT MIGHT BE GOING WRONG ?? OR BITE THE BULLET AND BUY A NEW TRUCK (CANT AFFORD)
Engine noises are hard to diagnose when following a description.
Have you tried a stethoscope or a socket extension pressed against the pan to isolate the location?
It is possible a crankshaft bearing or a connecting rod bearing has spun or is scored. If you can confirm the noise is in the bottom end of the engine and its approximate position it's time to remove the caps looking for a failed bearing.
The block transmits noises very efficiently so be sure the noise is not being transferred from a different location.
Here some info on the bottom end:
King Engine Bearing Crankshaft Installation Guide Feat XP Bearings
SOURCE: Engine replacement 1996 Chevy Blazer
I just replaced my engine in my 1996 blazer myself. Body need not come off, but what an ordeal if its a 4 X 4.
SOURCE: Chevy Aveo 1.6 Engine, Timing Belt Broke, Replaced,Runs Rough?
Did you have the dealer change the belt because it broke ?
If this is the case they should know if it is an interfearance engine and if it is in fact an interference engine they should have checked the valves. If you had the belt changed just because you were scared it was going to break on you then I am sure the car ran fine when you took it in.
The explanation you gave sounds to me like they have the belt a tooth off and they need to re do it because the timing is out.
I hope this helps
Regards
Sam
SOURCE: Knocking sound coming from around the oil pan.
This is a big sign that you might have a spun rod bearing if it's coming form your oil pan. Use a screwdriver and put the flat tip end on the oil pan and the plastic end near your ear like a stethascope and if you hear a knocking it's probaly a spun rod bearing or a bent or warped wrist pin on the bottom of your piston. So some good advice is to not run it anymore until you get it a mechanic to fix it. If you want to do it yourself you have a job ahead of you but refer to an Haynes Auto Repair Manual and you will have fun doing a job by yourself. I hoped this help!
SOURCE: 2004 chevy suburban flex fuel misefire
Compression Test the Cylinders. We had one doing the same thing. It was a warped valve on #4.
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