Question about 2002 Jeep Wrangler
No vibration, no change in rpm or speed, intermitent- just load noise in cab
Dash knocks. 2002 wrangler.
that\'s a good one but id do this.
1: kill the whole HVAC system power, (FUSE pulls) under stand how.
if this is not clear, ask or read the FSM page on HVAC.
it might be a berserk damper motor (device)
this car is TJ
using 2 persons to find noise works best and at 55 that big time danger. no? so do that, one drives. other uses a rubber hose to his
ear to find LOCATION, like in real estate, location is every thing, LOL.
its not a bad speedo cable, there is no such ani-mule on this car.
electronic end to end.
before working on any car, 96\' to now, defeat the air bags per FSM
first or get broken neck or worse at 55mph. really... RTM.
DO not ever work on cars with no FSM or find your self, playing harp.
I put my bet on HVAC
and using a real scan tool not autozoned junk, and see if you
have HVAC DTC errors.
i use a Innova 3160 and it shows them all. (so do others)
the $29 code readers are pure junk, on newer cars.
ok on 1996, but not newer cars with CAN buss or advanced electronics like ours.
SCAN IT FIRSTS ! THEN ASK QUESTIONS.
fooling around air bags at 55mph is fool hardy.
Posted on Apr 23, 2014
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Posted on Jan 02, 2017
Sounds a lot like a wheel balance problem, Does vibration go away over 55? In checking driveshaft joints...If you looked at them with the vehicle in park with the wheels on the ground, the shaft is "loaded" and cannot be correctly checked. To do this properly, vehicle should be in neutral with both rear wheels off the ground. Sometimes a joint can appear to be tight but still be bad. Check for traces of powdered rust around the rubber boots right where the end caps meet the cross on the inside. Any rust there indicates lack of grease and the likelyhood that the joint is frozen.
Check both balance and joints. Good luck.
Don't forget to rate my answer after you find the problem.
Posted on Mar 27, 2009
SOURCE: 2003 Jeep Grand Cherokee Quadra
Vibrations usually don't make noise BUT, a bad hub bearing or a differential that is severely worn can.
Bearings generally don't both fail at the same time so if you hear the noise on one side more than the other, likely that one has failed. You should also check the diff fluid level. (low lube level will quickly destroy the gear set) I'd go as far as removing the cover and checking the gears and looking at the lube itself to see if it has any metal in it.
I could tell you much more by driving it but obviously I can't do that!!
Posted on May 07, 2011
Tips for a great answer:
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To help differentiate a potential drivetrain problem from other common sources of noise or vibration, it is important to note the speed and driving conditions at which the problem occurs. Unfortunately, it is often difficult to accurately pinpoint drivetrain problems with only a road test. Expand the undercar investigation by putting the vehicle up on the lift, where it is possible to get a good view of what is going on underneath.
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