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Jeep Wrangler, Scheduled Maintenance, Steering, Suspension, Tires, SUV
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#1328 of 1888 Idle speed for 1999 TJ Auto - Too high?
Aug 26, 2008 (10:16 am)
I recently completed a training course on the Rubicon Trail with a 1999 Wrangler TJ provided by the trainer. His website lists the specs as:
I-6 4.0L fuel injected engine, automatic transmission, 3 speed, 300 transfer case, low range 4:1, axle ratio 4.88:1, BFGoodrich Mud Terrain T/A 35x12.50 R 15, 131:1 / 54:1 crawl ratio.
The idle speed stayed around 750RPM. At that speed, the Jeep would crawl at a fast walking speed on flat ground when in 4LO and first gear. Going downhill, there would be little engine braking because it would be already going too fast and I had to ride the brakes most of the time. The owner said this is how it was supposed to run, but I have rented Jeep automatics in the past and found they barely creeped in 4LO and low gear and they provided reasonable downhill engine braking.
The idle is not adjustable, but the specs I have found for the 4.0L engine say 600 RPM +/-70RPM, so 670 should be the upper limit. To me, 750 was too high and was causing my problem. The owner disagrees.
So, you Jeep automatic owners, what do you think? Is 750RPM too high? Should an auto in 4LO and low gear creep that fast? Shouldn't you be able to go down moderate grades on engine braking alone? Let me hear your take on this.
#1329 of 1888 Re: Torque Steering!! [wxyzach]
Aug 26, 2008 (11:39 am)
Are your control arms adjustable? My guess would not be torque steer, but more likely your axles are lined up to go right OR your steering wheel needs to be adjusted to be 'recentered'. THAT is something you can do yourself following the writeup here:
#1330 of 1888 Short time Wobble 2006 Jeep Wrangler X
Aug 27, 2008 (5:58 am)
I hit a man-hole cover at low speed, around 30mi and hour, and for a few feet my Jeep seemed like it was way out of alignment, it wobbled badly. It stopped after I drove about 50ft. It does not happen every time I hit a bump but it does happen now and then. Never been off-road and it only has 16,000 miles on it. All required maintenance has been done including tire rotation etc. What could it be? Also when I start slowing to a stop I hear a clicking noise. This does happen often. When you drive a vehicle for a while you get to know what is a normal sound and what isn't. The clicking noise slows as I slow.
#1331 of 1888 Re: Short time Wobble 2006 Jeep Wrangler X [skyking49]
Aug 27, 2008 (6:51 am)
For obvious reasons I can only be very non-specific, but you would appear to have a front suspension component that can change position or orientation under a momentary load before returning to it's original configuration.
It could be an upper or lower knuckle joint, maybe a softening control arm bushing, or possibly one of the many steering joints.
As for the clicking, it's probably either the brakes or a dry 'U' joint. You have 'U' joints on both the front and rear propeller shafts and the front half shafts.
#1332 of 1888 Re: Short time Wobble 2006 Jeep Wrangler X [skyking49]
Aug 27, 2008 (6:55 am)
It kind of sounds like something in the steering geometry came loose. Perhaps check the tie rod ends, track bar ends (especially the axle end). As for the clicking noise, it could possibly be one of the u-joints that goes from the axle shaft to the hub that turns at either front wheel. Mine clicks too, but I have a front auto-locker that I installed a few years ago.
#1333 of 1888 Re: Torque Steering!! [erickpl]
Aug 27, 2008 (8:05 am)
Unfortunately I am not mechanically inclined and I have a bad hand. I have not made any modifications to my Jeep. Why would this happen...all of a sudden? Why doesn't this happen with other vehicles? If it happened to mine shouldn't it be a problem with other 06 jeeps or jeeps in general. As I said, I only have 16,000 mi on it and it has been well taken care of. It is just hard to believe that normal driving would cause this problem...not saying it is not the problem. What would make this happen?
How can I prevent it from happening since I do not abuse my Jeep?
#1334 of 1888 Re: Short time Wobble 2006 Jeep Wrangler X [erickpl]
Aug 27, 2008 (8:08 am)
Would this be a warranty issue? It seems that Jeeps have a lot of problems that regular vehicles do not have. I am not mechanically inclined and have a bad hand so I cannot do any of the work myself. Thanks for your reply.
#1335 of 1888 Re: Short time Wobble 2006 Jeep Wrangler X [skyking49]
Aug 27, 2008 (11:57 am)
I's start by checking the steering damper. A bad damper will allow your front tires to go into a wobble oscillation when prompted by a bump.
#1336 of 1888 Re: Short time Wobble 2006 Jeep Wrangler X [skyking49]
Aug 27, 2008 (3:45 pm)
Your JEEP wants to leave the road. Your JEEP needs to leave the road. Your JEEP was built to go to the dirt. The shaking is much like a delirium tremor that an old alky will experience when deprived of his much needed booze. When your JEEP hits an bump it's off road soul is awakened and the deep seated need for dirt and mud and dust makes it veer towards the green and brown world where it belongs. Take your JEEP to the woods at least once a week and JEEP will serve you well the rest of the week.
#1337 of 1888 Re: Torque Steering!! [wxyzach]
Aug 27, 2008 (11:48 pm)
you might have a bent control arm, thats what happened to mine when i hit a ditch and now it veers to the left. my tire and rim and coil and shock and all that stuff is fine but the control arm is bent, thats all.