Engine noise diag..

Help...

http://www.youtube.com/watch?v=FUCrZ...JPP5PEpkt1Zkyg
http://www.youtube.com/watch?v=jetiS...JPP5PEpkt1Zkyg

I thought it was the flex plate, but I checked that all the bolts were tight and didn't notice any cracks..

Sounds like a rod but its not RPM dependent right? Its to deep of a sound for a going lifter.. does it make the noise if you change gears?

I can't hear it when I'm on the gas and driving. As soon as I get off the gas it's there again, doesn't matter what speed I'm going at the time.

Sent video linkto my dad, he knows these Jeeps like the back of his hand.. Sounds dumb but check you cat to make sure its not that rattling around and sending noise through dp

Pick one of these up. It'll help you pinpoint where the noise is coming from:

https://theultimatejeep.com/images/i...ge_18203-1.jpg

Third video with some engine revving.. seems like it doesn't go away when you gas it, just speeds up and seems to get quieter..

http://www.youtube.com/watch?v=U6vfJbAzaWI


I pulled spark plug wires 4/5/6 individually and the noise didn't change.

Is it more noticeable on the top of the engine?? Doesn't take long to pull that valve cover off and take a peak to see if its something obvious.

I wouldn't say it's more noticeable top or bottom, but for sure towards the back.

My dad said the he thinks its the flex plate, it cracks from the inside out youll have to pull the transmission and converter to do it.. 2-3 hrs to do but it will tell you for sure.. Since it didnt change with plugs out he knows for sure its mechanical on the outside. What happens is the crankshaft starts dancing inside when its got some miles on it and the converter wont move so the flex plate does exactly that, flexs. Id say its probably that..

I'm thinking along the lines of what Andrew said.

I bought a stethoscope today and I'm pretty sure it's the flexplate now also..

I'm going to outsource the repair though, and have to sit out RC this weekend.

Those scopes come in handy. Hope it gets fixed up quick man!

Took it to a guy who does repairs out of his house, seems legit, he's pretty sure it's the flexplate too, and quoted me $425 (including the $100 part) which doesn't seem to bad to me.. so hopefully I'll be dropping it off tomorrow so he can get it knocked out over the next few days.

That's not a bad price considering the transmission needs to come out.

Yea it was the flexplate..

https://theultimatejeep.com/images/i...950309_o-1.jpg

All fixed now?

Pretty!

Well that noise is all fixed :p It's an XJ it always makes noise.

I had him do the flexplate, and the rear main seal $550 including parts so not that I really wanted to spend the cash but it's still a good deal since it was about $150 in parts alone.