My endeavor has recently started making a rattling / pinging kind of noise when accellerating between 20 and 40 mph. It is NOT coming from the engine the noise sounds like it is coming from under the vehicle. It only makes this noise while driving. When I put it in neutral and rev the engine, there is NO rattle or ping noise. Is this an Exhaust issue (catalytic converter) a Transmission issue what? I don't believe this to be spark knock. Please Advise!!!
I had the same problem! I crawled underneath the car and discovered that a heat shield on the exhaust header pipe was corroded and rattling against the exhaust pipe. (Before the muffler) I removed the portion and clamps and solved the problem. Give it a try.
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All I can suggest is to make sure the tires are properly inflated, the tread wear is even (could be out of alignment). I doubt it has anything to do with tire balancing from what you described. If that's not the problem, it could be anything from damaged tie rods to worn out wheel bearings. If you want to check these yourself, jack up each wheel (one at a time) until it's not touching the ground at all, and give the wheel a few kicks. There should be very little or no movement and listen for rattling. Side to side movement makes me think steering issues, grinding or rattling noises, maybe bearings. It's not very expensive to have a mechanic give it a quick inspection. In fact "Multi-Point Inspections" are free at a lot of shops when you get an oil change or tire rotation etc. You should call a few and find out. Better safe than sorry. Good luck and safe travels.
DO NOT USE ANY OTHER FLUID OTHER THAN MITSUBISHI FLUID!!!! Any other fluid other than Mitsubishi fluid will blow the torque converter these transmission are very picky. Have a COMPLETE fluid tranny flush with Mitsubishi ATF Fluid. If your truck is an AWD that had a recall on the drive shaft, if you have an AWD and did not experience this before you have just been lucky and now had your luck run out at 160K. I would however put my money on the use of non-Mitsubishi transmission fluid.