1994 Isuzu Trooper Q&A
1994 Isuzu Trooper Question: Tapping noise from engine
Could be an exhaust leak, or something internal. You'll need to have someone look at it and isolate the noise, then determine the cause. That is almost impossible without hearing the noise. Hope this helps, even though I can't offer any solution! - munkyrench
I can almost guarantee it is a sticky hydraulic lifter or three...this is an inherent issue with the Isuzu 3.2L engine. Mine, a 92, has been tapping away for 125K...recommend an oil change and some oil additive like SeaFoam to quiet it down until the next change. Or you could spend the money to have them replaced. - imcja
A ticking noise may be noted from the engine valve train area. This is commonly caused by varnish build up in the hydraulic lash adjusters (HLA). Our technicians tell us that using Mobil 1 synthe...