Question about 1998 GMC Jimmy

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2000 4.3 small ticking sound

Bought it used, with almost 200k and it has a small ticking sound, steady. Sounds like a piston slap, however, on a longer trip yesterday (one of the coldest days of the year) under moderate acceleration it became noticeably worse (louder, almost more violent) and continued the rest of the trip home, where i parked it and have not moved it since.

In the past three days we've had single digit and negitive temperatures (in F)

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Well from what you dicribed it could be piston slop or rist pin slop, if it is i wouldent worry about it. it could also be a wore out rocker or lifter, with that many miles it could be most anything, but what bothers me the most is it got noisier when under acelaration witch could mean rod or maine. what about oil pressure? did you happend to chk. it as this was happening. you could try a heavyer oil like 10w40 with some additive like lucas or something along that line and see if it will quite down. your only out the price of a oil chg. if it were me i chg. oil like i said, and if it did not make any differance i would drive it until it blew, and then put a engine in it. but thats me. your cercomstances might be differant. start it up and listen, see if you can diterman if its comming from the top end or bottom end. heres a little trick you can use for listening to engine. get a long screw driver hold handel end to your ear and flat end to whatever you want to listen to, you will be surprised at howmuch you can hear and iscalate noises. hope i've been some help. OLD SCHOOL.

Posted on Jan 15, 2009

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