Last week my water pump went out so I replaced the pump and the timing belt. Now I hear a knocking or bearing noise. At first I could hear it mainly when I ran the ac. Now I hear it all the time. I cant tell where it is coming from, it seems to be from the front of the engine.

clayton

did you replace the timing belt tensor? If not, that is probably what is knocking.
-Ryan

I read the old posts and figured thats what it probally is. I didnt replace the tensor and I think I bent it a bit.thanks
clayton

Hi there!

I noticed that my Isuzu also does the same bearing, orl valves noise.
It happens MORE when I use the cheaper gas (89), but sometimes with 93 sporadically do the same. A mechanic told me are the lifters. The engine has only 37,000 miles, I am the ONLY owner since new, I changed the oil every 255-3000 miles including filter...no leaks and spend oil too.
SOmeone knows about this sound on the engine?
The sound is ONLY when I try to put more accerleration in some cases...not always...
Thanks for any comment..!!!

I also experienced that the dashboard showed me that I was in NEUTRAL and my shift display in DIRECT...and was really direct....
now stop to do that.