Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: BigJea on July 16, 2013, 12:59:06 PM

Title: '98 Wrangler TJ
Post by: BigJea on July 16, 2013, 12:59:06 PM

Hi Guys

Bit of a weird one - does anyone know what would cause a loud clunk when the foot is taken of the gas?

Less likely to make noise under very gentle deceleration.

J

Title: Re: '98 Wrangler TJ
Post by: gazjeep on July 16, 2013, 01:13:49 PM

Manual or Auto ?

Modded or standard ?

Could be propshaft UJ's or something as daft as a loose exhaust ...... more info needed  :icon_winkle:

Title: Re: '98 Wrangler TJ
Post by: wildwood on July 16, 2013, 01:23:26 PM

 :iagree: And most likely to be the axle end.... :icon_twisted:

Title: Re: '98 Wrangler TJ
Post by: eastryjeep on July 16, 2013, 06:51:26 PM

 :jump_125:

Hey, I know.... It's a bowling ball in the boot!

Please tell me I'm right, I'm desperate to start collecting loyalty points!

 :hysterical:

Seriously though, did it start suddenly, do you get thumps from the front when turning the steering, have you checked for worn or collapsed steering and suspension bushings, engine and gearbox mounts all present and correct?
Chock the wheels and go exploring underneath, it may be really obvious.
Grab the propshafts (4WD engaged) and twist by hand, shouldn't be any slack, slop or rattles.
Then hoick the front up onto axle stands and check the steering isn't all sloppy, check for broken springs, mounts etc, just put your common sense hat on and have a good look see, it may save you a fortune.
It's easy from an armchair but without more to go on we could send you on many a wild goose chase.

Title: Re: '98 Wrangler TJ
Post by: eastryjeep on July 17, 2013, 05:39:14 PM

Ah, great!
My first brownie point, just curious though, was the problem the bowling ball or summat else?

 :lol_hitting:

Title: Re: '98 Wrangler TJ
Post by: Bubba on July 17, 2013, 06:01:18 PM

Any vibes ?

Title: Re: '98 Wrangler TJ
Post by: isle of man on July 17, 2013, 08:06:36 PM

It's a prop UJ.

Title: Re: '98 Wrangler TJ
Post by: Bubba on July 17, 2013, 09:40:38 PM

That is my bet too

Title: Re: '98 Wrangler TJ
Post by: BigJea on July 19, 2013, 04:13:41 PM

Checked all u joints. All seem good. Mounts and bushings all fairly tight. Have recently replaced a load of them with heavy duty ones.

U joints on front shafts replaced a few months back.


Not likely to be a bowling ball as I haven't played in ages  :hysterical:


Just can't get my head around what it is and kinda of difficult to get underneath when it only happens under fairly rapid deceleration to pin it down...

J

Title: Re: '98 Wrangler TJ
Post by: BigJea on July 19, 2013, 04:15:41 PM

No desernable vibes except when stereo is up loud... :icon_biggrin:

Title: Re: '98 Wrangler TJ
Post by: wildwood on July 19, 2013, 04:35:32 PM

OK so UJs OK but if you have a small lift???? Then prop angle will have changed....... This will cause a vibe or a whine......either on acceleration OR on lift off........

Title: Re: '98 Wrangler TJ
Post by: Cockney Boy on July 19, 2013, 06:26:56 PM

Get an action camera stick it under, go drive and make said clunk, go home and review footage and report back