Top 20 1997 Jeep Wrangler - Page 5 Questions & Answers

my problem was misfiring after 20 cool down then ran fine, due to bad exhaust O2 sensor. Also during certain driving conditions jeep would back fires/lurch/misfire and sputter. What I discovered was battery was sliding into computer wiring harness, disrupting sensor input/output signals. I place a 1" spacer on rear battery clamp to push battery forever forward and this forever cured the problem.

my problem related to ASD (automatic shutdown relay) wiring not tight on terminals (fuse box under hood). I traced this to a mechanic (national chain) repeatedly kept dislodging the ASD wiring (while supposedly tracking down fuel pump problem). This act eventually caused the computer to fry.

google wrangler forums im sure theres at least 10 of them join a few and post youre ques there, and all future questions as well

Check wires for spark, also check make shure its getting fuel if getting bouth it should run.

bought a used 97 jeep that apparently had the same problem and had a low temp thermostat installed in attempt to cure the problem. I noticed when draining the radiator that only 1/2 of fluid came out. I jumped up/down on bumper and dislodged sludge and other half of fluid. Flushed system twice and then noticed temp gauge was now registering low, out of specs. Placed in correct thermostat and all problems solved.

It is computer controlled and any attempt to adjust will get you no where. Check the entire engine intake system for vacuum leaks. Use a can of carburetor cleaner and carefully spry it all over the intake and hoses, if you hit a leak the engine idle will change. You can also do this with a bottle of propane gas. DO NOT GET CARB SPARY ON THE CARS PAINT.

I have a 4cyl 97 jeep wrangler. My fuel economy went from 75-80 miles per 1/4 tank to 55-60 miles per 1/4 tank of gas. I traced this to a bad coolant temp sensor (replace twice), and fouled O2 sensors believed caused by my self by placing too much oil on spector air filter (now wipe off excess and let dry in sun), and using carb cleaner and or gas treatment (stopped using). fuel economy went back up to 75-85 miles per 1/4 tank. (also disruption of sensor input/output signals didn't help from battery sliding into computer wiring harness, which I cured by placing a 1" spacer on rear clamp to keep battery away from computer.)

Check for ruptured hose or loose clamps. If they look ok your waterpump may need to be replaced.

You have separate fuses for high/low beams. Check that.

My used 97 jeep wrangler fuel / economy problems: My vacuum canister was completely full with crud (replace). also my coolant temp sensor was bad (twice replaced), effects fuel mixture. and O2 sensors were bad (effect fuel mixture) due to being fouled by spraying too much oil on spector air filter (now wipe off excess and let dry in sun), also carb cleaner appeared to foul O2 sensors (stopped using). Also sensor input/output signals were constantly being interrupted by battery sliding into computer harness, which I cured by placing a 1" spacer on rear battery clamp to push battery away from computer. After curing these problems my fuel economy went from 55-60 miles per 1/4 tank to 75-80+ miles per 1/4 tank.

Sounds like the starter has worn out. The brushes could be worn out or it could have a dead spot in the armature.

6 or 4 cylinder?

Could be a faulty connection with the battery cables, a bad ground, or any number of things. What do you have to do to get it started again ??

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

SOUNDS LIKE YOU HAVE BURNED OUT BULBS, ESP. THE BLINKER REPLACE LEFT FRONT BULB SHOULD FIX IT

#6 Fuse is the Auto Shutdown RelayThere is a short somewhere

The horn should be behind the grille or on one of the fenders in the engine compartment. If you unplug it and the fuse does not blow I would say the horn is done.

rich,101 this is a MAP , speed density EFI fueling system,,,, not misfiring. in no order,

1. map reads, low all the time cause rich, (low means low vacuum that is real) the ECU sees that and adds huge fueling.
2. fuel pressure way too high bad PFR.
3. injector leaking i do an injector leakdown test, or balance test, like the book shows. (and has 3 causes)
4. front 02 sensors struck lean , forced ECU to go RICH. Any exhaust (its air sucking in) leaks, cause the 02 to go nuts or stick at 0v all the time. and RICH will happen. unplug it , get better?

we use simple tools to find this. is vacuum at 19 inches HG at idle.? hot? sealevel #s/ ???? clean the map yet?

is it connected?

Did u check fuel pump.