1997 tj 4 cyclinder cuts out sometimes - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-01-2007, 02:32 PM
jeduffy
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1997 tj 4 cyclinder cuts out sometimes

was wondering if anybody had any ideas what could be wrong with my 1997 tj . the gas gauge will start acting up like showing half full or empty and then it will start to rough idle untill you give it gas and rev engine everthing starts working again. seem like it cuts out more when your going at a lower rpm but when you give it gas it will rev up all through it. any ideas . thanks johnny
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post #2 of (permalink) Old 06-01-2007, 08:27 PM
 
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Check your fuel pump and filter. If the filter has never been replaced, replace it, it shouldn't be more than $20 to do so. Run some good fuel system cleaner in it after you do that and see if that clears it up. If it doesn't, I would guess it's either a bad fuel pump or a clogged fuel line.
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post #3 of (permalink) Old 06-02-2007, 08:05 AM
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A 4cyl 97 doesn't have a fuel filter. it only has a screen in the tank. Why jeep did that I have no Idea..

Ya only go around once, best to enjoy it the first trip.
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post #4 of (permalink) Old 06-02-2007, 08:11 AM
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How many miles on the Jeep?

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post #5 of (permalink) Old 06-02-2007, 09:25 AM
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Before you start throwing parts at the Jeep, sit down and figure out what's wrong.

Is it an electric problem, a fuel pressure problem, or a problem with the ignition system. Some of the things you'll look at are:
  • Wiring harness,
  • Fuel Regulator,
  • Fuel pump,
  • CPS sensor,
  • ASD realy
  • Ignition system
Don't confuse the fuel gauge problem with the way it runs, you may have two problems. They may be related with the same cause, or not. Here's what I'd do, in order:
  • Run Seafoam fuel treatment through a tank of fuel.
  • Have the fuel pressure checked
  • Check the condition of the ASD relay (pull it open and look at the contacts)
  • Check the fuel pump relay (again, pull it apart and look at the contacts)
  • Check the CPS senor and it's wiring harness
  • If the engine doesn't restart quickly, carry a spare plug and wire to check for spark, or
  • Carry a multimeter to check if the Positive side of the coil has voltage,
  • When it's missing/loping at idle do the propane trick (Use the search function). or,
  • Use a little starting fluid in the air intake
I'll be looking froward to what others add.
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post #6 of (permalink) Old 06-02-2007, 11:08 PM
 
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Quote:
Originally Posted by Rio_Grande View Post
A 4cyl 97 doesn't have a fuel filter. it only has a screen in the tank. Why jeep did that I have no Idea..
Dang, didn't know that. What a bunch of retards.
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post #7 of (permalink) Old 06-02-2007, 11:32 PM
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What LEVE said - all good!

Gad gauge and runs rough, then you rev it a bit, and it works fine again.

Try running a new ground wire directly from battery (-) to something solid metal under the dash. Make sure it's an integral part of the dash structure.
TJ's seem to have a ground problem - and it's very hard to find - sometimes a whole new dash harness helps, sometimes not.
The easy way I've found was just drag a new wire.
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