Pearl Sutton wrote:Q: Did the sound build up slowly or sudden onset?
thomas rubino wrote:So Jordan;
Hows that engine run at speed?
Loss of power maybe?
Any hiccups or stuttering?
As a 2002 it has the OBD2 check engine system.
Is the check engine light on?
Do you know what codes it is sending?
thomas rubino wrote:OK;
How about an EGR valve or pipe?
...maybe Joylynn Hardesty has been taught something by the infamous Saab that may yield an enlightened guess, lol!
Joylynn Hardesty wrote:
It does sound to me like it's spitting air somewhere. Are all the exhaust hoses, connections in good shape?
John C Daley wrote:Geez, I have to go with the Valve as suggested earlier.
Low on oil or stuck / slow lifter.
Have you tried with a stethoscope, IE long bit of narrow timber placed between ear and different spots on the engine?
You will locate the noise and have it separated from most other noises.
Robert Ray wrote:My guess is a cracked exhaust manifold. I keep one on the shelf, it's a common component that is prone to failure on that vintage jeep.
thomas rubino wrote:I would suggest removing the valve cover next and taking a look.
Something may be obvious or you may need to start the motor to see/hear the problem.
Is this an overhead cam motor or an overhead valve?
Performance should be affected if the valve train is wonky.
I have seen overhead cams be broken and still run...
Better yet just run it over and we will put it in the shop, it's not a Subaru but for a fellow Permies I can fit it in, just don't tell anyone...
thomas rubino wrote:Let's see;
Broken wrist pin...
Timing chain ...
Sorry, but it's not looking good for an easy fix.
Let us hope you can get this figured out!
As you say at least it's not below zero or over 100 outside!
randal cranor wrote:Howdy,
I like this photo, very "artsy" coloring etc., especially the reflection in bottom of oil pan.
Will Wit wrote:I'm a little out of my element here but..
Same cracks forming, same side, across several cylinders.
wobble would place stress on the same side of the rotation, possibly across the entire crank.... bearings