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[Dixiesteve87]

Ok, so let me give you all the information that I can so that you can make your decisions from there....

I own a 2003 Jeep Cherokee ( liberty) 2.4l petrol sport. The vehicle has covered 83000 miles and has a fsh. I have an LPG Conversion on the vehicle, so it runs duel fuel.

I was driving my jeep along the motorway when one day at about 50mph, I lost all power and the engine cut out. The engine would not start at all.

I managed to get the jeep home and what had happened was that the timing belt had shed its teeth. Not broken, but has basically created a smooth belt patch.

New timing belt went on, and the jeep runs. Compression is brilliant and even all across the 4 cylinders ( I believe 16 bar was the figure the mechanic told me) so doesnt look like anything is broken or bent.

I also fitted a new battery at this point as the old battery was knackered and did need replacing. (battery was dead for a full 2 weeks)

At first, the jeep would only tick over at about 2000rpm, any thing less, it would stall. The Idle control valve was taken off and found to be seized. This was cleaned and refitted and now the jeep ticked over, but quite lumpy.
The jeep would also stall when you would slow down  for a junction and dip the clutch ( eg stop signs, traffic lights, give ways)
It doesnt stall all the time... but does most of the time.

So I replaced the Idle valve.

Seems to tick over a little better, but still stalls, its like the car want to tick over too low, at like 400 rpm. sometimes it drops and then picks its self  back up.

if you put the ac on, it stalls very rarely, and the revs sit at about 900 rpm...

I have done a fair few 100 miles to try and let it relearn, but theres no improvement.


help me sort this out


steve

[bigjeepzj]

There a three sensors it could be
the throttle position sensor my best guess
then you've got the crank and the cam sensors
you may not get error codes if the sensor is sending false info to the ECU

I could be wrong

[Hillbilly]

  Could be any of those. Does it stall while on petrol and lpg or just one of them?

[bgbazz]

A real long shot..disconnect the negative battery lead and leave off for about 30 mins. Make sure you have your radio code handy before you do this, you'll need it to reset it later. Reconnect, turn ignition on and wait 30 seconds to minute before starting.

Not saying it will cure it, but it's a free way of checking. My '03 KJ CRD had a glitch similar to this last month and this method cleared it. Running perfect ever since.

[Mike Pavelin]

If it wasn't doing it before the belt went, I'd re check the cam timing.

[bgbazz]

The reason I even mentioned  the battery thingy is because I'd had the flat battery problem just prior to the problem showing up. My motto is..start cheap and work up.

[xr6jeeper]

If it wasn't doing it before the belt went, I'd re check the cam timing.

I agree with mike, sounds like your a tooth out on the belt.

[daggie]

If it wasn't doing it before the belt went, I'd re check the cam timing.

I agree with mike, sounds like your a tooth out on the belt.

 

[Dixiesteve87]

cool, well i shall check the timing. Im not the best with engines, especially the internal stuff, so if i sound like a right tosser with the next comment... I appologise.... If it was the timing was marginally out, would the engine not run rough throughout the entire rev range, rather than merely at tick over?

I shall give the batterya go and see if that helps... I know the jeep is meant to Learn tickover etc over a short while... does it continuously do this, or is it just once initially after a long disconnection period? I ask that because if it is only the initial learning then this would have been done with the knackered IAC valve...

I guess the main areas before the issues that have changed are the battery... as the old one was proper fooked and then sat for 2 to 3 weeks with no charge... and the timing belt....

we did replace the crank and cam sensors as these threw up the initial fault code...


where will the throttle sensor be on the 2.4 engine?

steve

[Lukemagnum]

A VW I had a few years ago had the timing belt replaced just before I bought it. It used to be a pig to start cold and the idle speed was a bit erratic, a scan showed faulty cam sensor. I found the timing to be out by 2 teeth, on the move it was surprising how well it went in that state.

Apart from a bit of time and maybe a grazed knuckle, it doesn't cost anything to check it either.