Close
QUESTIONS

RepairPal is your advocate for car care advice and guidance

Q: I have a 1999 Gmc s-15 sonoma with a mild engine knock on cyl #3 on 1999 GMC Sonoma

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When the engine is fully warmed up the noise almost goes away! We have pulled the motor and dis-assembled, all wrist pins are a little loose but #3 isnt any worse than the other 3.Also all rod bearings look good, and the main bearings on each side of the #3 rod look ok. All pistons mic to be standard size. Are there any odd causes for this type of noise in this year model motor? Please HELP!!!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
Why do you say #3 is the problem? How did you test,pull
Plug wire while running? Or something else.
1st answer ask about a rebuild,i missed that part.
Pulled plug wire also stethoscope test its Def coming from 3 no rebuilde yet just diagnosis at this poi.
This is a puzzle,i have been doing this a long time.Most noise gets worse in a warm engine.
I know a machinest/motor builder, been doing this a long time too.I'll ask this wizzard and get back
if can help.Something is expanding and then fits better.
Didn't find what you were looking for?