"MontanaRodeo": I have a 98 Rodeo 4WD with a 3.2 V6 w/120,000 miles that started making a noise about a year ago.....likely 'risk pins', and that it could go at anytime......
After reading these forums, I get the impression this noise could be one of any number of problems (e.g. dirty valves, the timing belt tensioner, etc.) .....
Is my mechanic likely right or could it be some other problem? What are "risk pins"
....If not the risk pins, what should my first step be in diagnosing the problem? ....
Let me describe the noise: It is a tapping or perhaps even a rattle. It occurs when accelerating or going uphill or going over 70 mph when the engine is at about 2500 rpm. The noise is either there or isn't. In other words, it doesn't get softer or louder or change in tempo. If it has gotten worse over the past year that I have been driving it, I haven't really notice.
I'm not a mechanic. .
well, it's a little hard to tell. what's missing from your description is how loud
a hard, loud rap rap rap that says (to even non-mechanics)
"oh-my-god-the-rods-are-going" is probably the timing belt tensioner you've been reading about. the solution is change the timing belt, the timing belt tensioner and the water pump while you're there.
a little tap tap tap louder than you'd like and kind of like a diesel is probably the excessive valve tappets noise you've been reading about.
a kind of rattle you describe above could be pinging which is associated often with octane issues and other factors, including lugging the engine, etc.
i don't think
a mechanic would confuse 2.) and 3.) above with serious rod noise, or with *wrist pins* (which attach the connecting rod to the piston).
he could, would make that leap if it were 1.) and he wasn't familiar with this common problem with isuzu's.
so, i, for one, am looking forward to more info on the volume and description of this problem.
1992 trooper 3.2L sohc automatic . . . as is