Grand cherokee 1998, 4.0 L, throttle position sensor.

you need to check all sensor connections as the crank shaft sensor also will mess up your idle....try slightly unscrewing the tps and push it up or down slightly to see if this fixes the problem.

still bad. still guessing?

The Throttle Position Sensor, or TPS is connected to the throttle shaft on the throttle body.



Fig. 2: Disengage the Throttle Position Sensor (TPS) wiring harness connector

According with the Grand Cherokee Repair Manual, check this removal & installation procedure...
(see Figures 5 and 6)

1. Remove the air intake tube at the throttle body.
   
2. Disengage the TPS wiring connector and remove the two mounting screws.
   
3. Carefully remove the TPS from the throttle body.

To install:

1. The throttle shaft end has a tang that can be fitted into the TPS two different ways. Only one of the installed positions is correct. When correctly positioned, the TPS can be rotated a few degrees. To determine correct positioning, place the TPS onto the throttle body with the throttle shaft tang on one side of the TPS socket. Verify that the TPS can be rotated. If the TPS cannot be rotated, place the TPS on the throttle body with the throttle shaft tang on the other side.
   
2. Tighten the two TPS mounting bolts to 60 inch lbs. (7 Nm) and engage the wiring connector.
   
3. Manually operate the throttle and check for any binding.
   
4. Install the air intake tube.

Fig. 5: Remove the throttle position sensor retainers...

Fig. 6: ...then, remove the throttle position sensor

Additionally, its possible that you are interesting in some section about this repair manual: Jeep Grand Cherokee 1993-1998 (ZJ Series).

Hope this helps; just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment. Thank you for using FixYa.

Jose.

Hello Lubie...

I would STRONGLY recommend you get your codes read...

I TRIED ALL that TOO...

Finally my codes... said the OXYGEN SENSORS were complaining... OBD... DTC
(on-board-diagnostic... DIAGNOSTIC TROUBLE CODES)

So... of course I changed the... OXYGEN SENSORS.

The "NEW" OXYGEN SENSORS complained just as well...

I have subsequently learned the "SENSORS" are
just doing their job...

In my case reporting on a collapsed catalytic converter.
(muffler is actually a MORE common blockage).

A little hunting around... like Auto-Zone ... Napa auto...
Pep-boys... O'Reilly Auto Parts... even MIDAS might
yield FREE READINGs... (check around).

Just remember to wear your best SALES RESISTANCE...

and look up you prices on ROCKAUTO...
before you go... Hope this helps.

ROCKAUTO
1998 JEEP CHEROKEE 4 0L L6 Catalytic Converter RockAuto

1995 JEEP CHEROKEE 4 0L L6 Catalytic Converter RockAuto

Carnac the Magnificent

On my dodge truck, it was the throttle position sensor that went bad. It is located on the side of the throttle body. $50 for a new one, or $100 to have a shop do it.

code refers to throttle cable adjustment, throttle position sensor, throttle position switch,throttle pedal position sensor, throttle position position switch, this is the areas that you need to check out

Most likely cause is the crankshaft sensor.

try pulling the plug out on the idle air control valve then start it if thats not it try the map then the idle control

these jeeps did have a small problem with the tp sensor. i would also have the back pressure of the exhaust checked to see if you have a catalytic converter choked up.

Check throttle position sensor. Specs for yours are found in any decent repair manual. If fuel filter is old, change it as well (may not fix problem but is good maintenence procedure often ignored)