4.0 SOHC Engine Noise
#1
4.0 SOHC Engine Noise
Hi all. Bought my 2001 4.0 4x4 in 2009 with 90K. Upon cold start up, the engine would always tick in a rythmic fashion, until it warmed up. Now at 115K, the engine is noisy at all RPMs, in Neutral, and whether or not the clutch is in or not. The noise gets progressively louder as RPMs increase. I replaced the rear timing chain tensioner and no improvement. I will do the front soon. Do you think one of the guides have gone? However, before the constant noise, there was no noise specifically between 2-3K RPMs that I could hear. Suggestions are welcome. Thanks.
#4
I will try to get a video later. It is primarily located on the underside, from what I can tell it is near the engine/trans connection. I can hear the noise through the shift boot and also outside of the cab if I am outside. The noise seems to get quieter as I walk away from the door towards the front. The noise is not random, it is a pattern that increases as RPM increases.
#8
#12
Runs great, no loss of power. I think the MPG is going down. I have only done only fillup since the problem emerged. I used to get 16-17 in the winter and last fillup I only got 14.5. No misfires, I can't hear anything from engine specifically. It is loudest if you step out of the cab and kneel down. If you move away from the cab it is not as noticeable. I just replaced throw out bearing, clutch, pressure plate, and slave two weeks ago just after this problem started. The truck shifts fine, no issues and the gears are smooth. I don't think its the tranny.
#14
#16
#17
#25
or in the dark.Also you can remove one plugwire at a time while running to see which one changes the idling of the engine in the least.If you pull one and the engine doesn't stumble,bingo.