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Any body ever dealt with a mexican jumping gas gauge, my gauge keeps bouncing around after fill up ? Drops past empty then back to full and sometimes the low fuel light will turn at half a tank is this the sending unit on its way out or a gauge problem
It wont happen all the time but its becoming more of a problem lately.
98 xj 4.0
It wont happen all the time but its becoming more of a problem lately.
98 xj 4.0
CF Veteran
Joined: Apr 2011
Posts: 4,825
Likes: 2
From: Indianapolis
Year: '99 and '91
Model: Cherokee
I used this "feature" to warm up the DD the other day. Drove my GF to work and back with no keys in. Got home and couldn't shut it off. I was like wtf is wrong with my ignition? I then realized my keys were on my belt loop. Lol
Senior Member
Joined: Apr 2009
Posts: 791
Likes: 0
From: Houston Texas
Year: 1996
Model: Cherokee
Engine: I6
Any body ever dealt with a mexican jumping gas gauge, my gauge keeps bouncing around after fill up ? Drops past empty then back to full and sometimes the low fuel light will turn at half a tank is this the sending unit on its way out or a gauge problem
It wont happen all the time but its becoming more of a problem lately.
98 xj 4.0
It wont happen all the time but its becoming more of a problem lately.
98 xj 4.0
Junior Member
Joined: May 2008
Posts: 15,016
Likes: 11
From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
Engine: 4.0
There's a spacer between the gear box and the frame. It's known to crack and cause popping.
OR the frame rail is known to crack there and cause popping. Just make sure the gear box isn't moving around.
OR the frame rail is known to crack there and cause popping. Just make sure the gear box isn't moving around.
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Not necessarily. There are a few codes for hard faults with them but if the numbers are just whacked then the PCM has no real way of telling. On OBD-I the rear O2 I don't believe is involved in setting fuel trim (unlike OBD-II). If your forward O2 sensor is original, go ahead and get an NTK replacement. They only last about 80k




