Question about 1996 GMC Jimmy
The knocking or ticking is going to determine if it is in the top end, lifters, push-rod or rocker arm issue or the bottom end that would include pistons or bearings.
If it is a ticking noise, it will more than likely be a valve train issue.
If a knocking noise, piston or crankshaft related problem.
Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Posted on Apr 19, 2009
I just got a 2000 blazer with the 4.3L vortec (262) it sounds as if u r experiencing the same sound i was. i took it to a machnic because i thought it was the lifters. after having those replaced the sound was still there. i searched for months for answers and was finally tok it was the counter-balance shaft bushing. this was an annoying sound but i learned i could run it for a while with it like this. just make sure ur oil pressure is stable and put 1 quart of lucas oil and the rest a synthetic blend. let me know how it works.
Posted on May 04, 2009
I wanted to add my recent experience to this thread...I recently purchased a 94 Silverado with the 4.3L balance shaft design. 139k miles and 180psi on all cylinders. Loud rattling noise just over 1K rpms. After tearing down motor.. inspected anything that would create this noise. Upon removal of intake and inspecting balance shaft.. I could grab shaft and rock it back and forth almost duplicating the noise. Then when timing chain was removed and balance shaft gears inspected.. the balance shaft drive gear behind cam sprocket had hollowed out bolt holes and dowel pin holes! After numerous new parts.. oil pump.. rod bearings.. balance shaft front bearing.. balance shaft gears.. timing chain/gears.. heads redone.. new push rods.. all new gaskets. it still makes the noise however its not as loud. There is a fix for the newer motors with a new timing chain tensioner kit but is not available for first gen years!. The new balance shaft gear was clearly tight on the dowel pin now and it made a difference but not completely. Read that.. GM indicated that this was not an issue.. well if the cam bolts broke from the cheap balance shaft gear metal banging away on them it will be an issue!.
Posted on Dec 06, 2014
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