20 Most Recent 1997 Jeep Wrangler - Page 2 Questions & Answers

similar problems: After 20min cool down jeep was bucking/lurching that I traced to bad o2 sensor in exhaust manifold (which you've replaced is seems). The second problem of bucking/lurching, backfiring under certain driving conditions I traced to the battery sliding into the computer wiring harness, disrupting sensor input / output signals. I cured this problem by placing a 1" spacer on rear battery clamp, pushing the battery forward. Been years and no return of problem.

change the spark plugs and wires

try new spark parts yet, called a tuneup. ? on this old, wires and spark plugs. i pay no attention to the CEL, i scan them all you do know that the CEL does not come on for all fails. and in canada, lots more. missing. scan it , and do so when it messes up in WIN. my guess,no full tuneup for last decade. right>?

double posted, now adds rich but not the actual DTC number sadly. why not post real numbers. we work best with hard facts not interpretations. ... case in pont mike uses ford book to look up jeep DTCs. he fails.

related problem with disrupted sensor input/output caused by battery sliding into computer wiring harness. cured by placing 1" spacer on rear clamp pushing battery away from wiring harness and computer.

My problem bucking/backfiring after 20min cool down was due to bad O2 exhaust sensor. Also discovered same during certain driving conditions was due to battery sliding into computer wiring harness disrupting sensor input/output signals. Cured problem by placing 1" spacer on rear battery clamp to push battery forward away from computer wiring harness. This cured the problem from ever reoccurring.

Replace the pump fuel solinoid.That only allows fuel through when the ignition is swiched on and its that is the fault good luck.

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.)

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.

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.

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.

Similar problem due to wiring on ASD (automatic shutdown relay) not connected tight to terminals on underside (fuse box under hood). I encountered this problem repeatedly after a mechanic (national chain) kept removing this wire for some reason (eventually causing computer to fry). Also related problem misfiring/backfiring/bogging down under certain driving conditions I traced to the battery sliding into computer wiring harness and disrupting sensor input/output signals. Placed 1" spacer on rear clamp to push battery forward, which cured this problem.

my horn problem seems related to a bad horn connection, and a bad clockspring, (shorting out and energizing horn relay, causing battery to drain dead over weeks).

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 used 4 cyl jeep radiator would only drain 1/2 of the fluid. jumped up and down on bumper and this dislodged the sludge in radiator and/or engine. flushed twice, then now notice low temp reading on gauge (out of specs) due to a low temp thermostat that someone installed due to previous over heating (sludge). Replace with factor spec thermostat and everything is fine.

my similar problem on 4 cyl jeep was cured by replacing both O2 sensors and coolant temp sensor (for second time). Also problem seemed to be related to putting too much oil on spector air filter and using carb cleaner which appeared to foul O2 sensors (a second time). replace sensors O2 sensors a 2nd time, stopped carb cleaner and now wipe off excess air filter oil and let dry in sun, and fuel economy went back up to 75-80+ miles per 1/4 tank of gas (vs. 55-60 miles per 1/4 tank of gas with fouled sensors).

Check for intake leaks, intake hose leaks, check mass air flow sensor. 02 sensors will keep setting off a lean code until the air problem is fixed.

Heater blowing cold air,indicates towards low or no coolant or the coolant flow is getting obstructed or the heater core is clogged or hot to cold moving flap/ door is stuck in cold mode. There are many possibilities, that needs to be checked. Click the link below for step by step details:--- http://technoanswers.blogspot.com/2011/10/heater-blows-only-cold-air.html ---------- This should help.Thanks.Helpmech.

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?

Have the starter motor tested.