Hello new to the site and need a little advice on an 00 mounty

[yakkier]

Hello my name is James and i was curious if some one could help me out a little bit, i have a 2000 mountianeer with the SOHC 4.0 which i know about the issues with timing chain tensioner but so far all iv read has been that it rattles at a higher RPM. Mine rattles on the lower front of the engine only at idle and it seems as though it's idling way to low ( 500rpm ) iv replaced the TPS along with a full tune up IE plugs wires coil and iv replaced the lower manifold gasket. But to no avil it still does it and it's driving me nuts. Iv checked the belt tensioner along with idler pully and hermonic balancer to see if the pully was loose but nothing was found.

If any one has any idea's i would be greatful


thanks in advance.

 

[2000StreetRod]

Remove the belt

The fastest way to determine if the rattle is coming from the engine or the accessories is to remove the serpentine belt. After removing the belt, cold start the engine and let it run for a few seconds. Since the water pump will not be turning, don't get distracted and let it run more than a minute.

The primary (crankshaft to jackshaft) timing chain and tensioner are located in the lower front of the engine. If the tensioner has never been replaced it may have failed. It can be replaced without retiming the camshafts or removing the engine.

I don't remember if the 2001 SOHC V6 has a single or two piece intake manifold. If it is the two piece, then the upper gaskets could be leaking. The cold start rpm flare should be more noticeable now that the weather is getting cooler.

Low idle speed could be due to a defective IAC valve. You might try cleaning it.

 

[yakkier]

Thanks alot, i was considering doing that but never did, I will give it a shot and see if it's a bolt on issues instead of internal.