Need help

[AldoAl]

Hello everyone
I have a 2003 JEEP KJ 2.4 Gasoline+LPG system.
When I drive the car, it doesn't have enough power, it jerks , and when I take it out of gerar and leave it in neutral, the engin shuts off.
I've already replaced the brake cylinders, spark plugs, spark plugs wires and the 4 intake manifold gaskets.
Any idea what it could be?
Thank you!

 

[2TALL1]

Kinda sounds like it’s running out of fuel…

 

[KJowner]

Is it the same on gas and LPG?

 

[AldoAl]

Is it the same on gas and LPG?

Yes the same in Gas and LPG

 

[AldoAl]

Kinda sounds like it’s running out of fuel…

The fuel is in max in both gas and LPG

 

[KJowner]

Any fault codes? I'd guess an inlet air leak.

 

[Puddle Jumper 2.0]

I had a 97 TJ that was doing this and it was my TPS (throttle position sensor) malfunctioning. Not sure if a cam or crank sensor could be doing the same thing on your KJ???

 

[cas123]

Hello everyone
I have a 2003 JEEP KJ 2.4 Gasoline+LPG system.
When I drive the car, it doesn't have enough power, it jerks , and when I take it out of gerar and leave it in neutral, the engin shuts off.
I've already replaced the brake cylinders, spark plugs, spark plugs wires and the 4 intake manifold gaskets.
Any idea what it could be?
Thank you!

I never heard of gas + LPG. Air or fuel. You did plugs and wires. Dirty fuel injectors, vacuum leak, air filter. Those would be next for me. Mine seemed to be the CAT converter and Cataclean helped. I also switched to premium gas which helped. I have used SeaFoam in the past to clean the injectors. Coilpacks- did you change those? or just the plugs? I would check a service manual if you can as your vehicle setup is different than the typical gas ones here in the US. Do you have a code with this?

 

[KJowner]

I'd guess he is in Europe, gas conversations were popular a few years ago, not sure what its like elsewhere but LPG filling points seem to be disappearing in the UK, talking to people who had the conversations valve seat recession was an issue even with cars suitable for unleaded.
A shame because it was way cheaper than our overpriced fuel.

 

[AldoAl]

I never heard of gas + LPG. Air or fuel. You did plugs and wires. Dirty fuel injectors, vacuum leak, air filter. Those would be next for me. Mine seemed to be the CAT converter and Cataclean helped. I also switched to premium gas which helped. I have used SeaFoam in the past to clean the injectors. Coilpacks- did you change those? or just the plugs? I would check a service manual if you can as your vehicle setup is different than the typical gas ones here in the US. Do you have a code with this?

 

[AldoAl]

It’s Gasoline-Petrol+LPG i put also the injectors cleaner but is the same I changet again the spark plugs.
I’m in Albania that why I posted here because here in my city no one is working with these jeep

 

[AldoAl]

Any fault codes? I'd guess an inlet air leak.

Before it was the code of the throttle body but i open and clean the throttle body with the sensors and now i don’t have any code

 

[AldoAl]

I had a 97 TJ that was doing this and it was my TPS (throttle position sensor) malfunctioning. Not sure if a cam or crank sensor could be doing the same thing on your KJ???

Hello thank you yes the car shows the code of the throttle body i open the throttle body and clean and the sensors i clean but is the same

 

[AldoAl]

I'd guess he is in Europe, gas conversations were popular a few years ago, not sure what its like elsewhere but LPG filling points seem to be disappearing in the UK, talking to people who had the conversations valve seat recession was an issue even with cars suitable for unleaded.
A shame because it was way cheaper than our overpriced fuel.

Is it the same on gas and LPG?

Yes the same

 

[KJowner]

It might be worth trying a compression test, as I mentioned in England LPG dropped out of favour because it could cause the exhaust valves to burn out on some cars.

How complex is your LPG system, is it a gas vaporizer/carburettor setup or an injection system? As the fault occurs on both systems it must be a common point. If you have an injection system then it probably measures air flow from the MAF, I'd guess this is in the throttle body (I have CRDs so I'm not familiar with the setup on the v6) you have already had an error code from this so it's probably worth trying a replacement. If the ECU is getting incorrect air flow data the fueling will be off.

 

[Puddle Jumper 2.0]

Hello thank you yes the car shows the code of the throttle body i open the throttle body and clean and the sensors i clean but

Hello thank you yes the car shows the code of the throttle body i open the throttle body and clean and the sensors i clean but is the same

If the sensor is bad. Cleaning it won’t help. It needs to be replaced.