Jeep Wrangler problems

[tomtaylor1]

Hi All, is there a workshop preferably in Pattaya, but can travel to Chonburi or Bangkok, who can hook up the engine to a diagnostic machine, the problem being when I drive over rough ground, the engine cuts out or will not rev, having to drive with one foot on the brake the other on the accelerator when driving down hill. Since arriving back in Pattaya have tried to create the same problem, but with no avail, this is the second time this has happened, the check engine light also comes on. The Jeep is able to run on petrol or LPG, the same problems with either fuel, the problem will sometimes rectify itself, then re appear.

Tom

[thailoht]

Could easily be any of several things of the 'loose connector' variety ...?

Maybe you can connect to one of those personal ODB II hand-held units and get the code readouts from it?

[tomtaylor1]

Hi thanks for the info, took my jeep into an lpg shop, sukhumvit road, he plugged in his ODB unit, but it did not register any faults, said ecu was fine, so mabe will need to wait till it all happens again.

Regards Tom

[thailoht]

Hi thanks for the info, took my jeep into an lpg shop, sukhumvit road, he plugged in his ODB unit, but it did not register any faults, said ecu was fine, so mabe will need to wait till it all happens again.

Regards Tom

That's the way those things sometimes go .......!

BTW, which engine model do you have in your Wrangler?

[tomtaylor1]

Hi All, the engine is the 6cyl 4.0litre 2004 model.

Took the Jeep in to an alternative shop, who said all the spark plugs had failed, replaced them, an unlikely event.

They again plugged in an ODB unit, indicated a faulty map sensor, so my question is, is this an original device which came fitted to the engine, or a device added when the LPG was installed.

The map sensor it does in some ways point to a faulty sensor as both the LPG and Petrol are affected.

Any replies would be gratefully received.

Tom

[tomtaylor1]

HI All, forgot to mention that the mechanic said that as the map sensor is faulty, the engine does not know whether to run on lpg or petrol which is causing the problems, although the jeep does seem to be running better at the moment, it does some times still cut out at low revs, so I am having to drive with a foot on the brake and one on the throttle to keep going, but having said that, before have driven for hundreds of kilometers before the fault arises mainly having driven over a pothole, then to right itself maybe a few hundred later.

Tom

[tomtaylor1]

Hi All, problem solved, after discovering the map sensor was the problem I investigated further, the wiring had become frayed where it went into the wiring loom, this was caused by the lpg valve having a too long a bolt fitted, so every time you passed over rough surface this made contact with the wires, causing the engine not to run properly or short out the map sensor causing the engine to stop.

Thank you All for your input.

Tom

[VocalNeal]

Well done that man!