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[Plank]

I have a 1998 Grand Cherokee 4.0 Ltd. LPG converted,which runs beautifully, except for one minor issue.

Whenever I go on the motorway after approx. 6-8 miles the "check engine" light comes on but with no effect on performance or anything else. I have done the trick with the key and no codes show.

I re-set the indicator by removing the + lead on the battery with no further indication until the next time I go on the motorway.

This is just an irksome minor problem but it gets on my tits that I can do 200 miles commuting and pottering around with no problems but after 10mins on the motorway, this damned light comes on.

Any ideas anyone?

[Jonny Jeep]

My first thought would be to find out what the code is before resetting the MIL lamp.

[big g]

I get that shit on me Bronco sometimes,run it on petrol for a couple of miles and it disappears for the rest of the journey.

That's as far as me investigation went but maybe worth a try.

[bigjeepzj]

Just a though and may be wrong
have you drained the lpg vaporizer
you undo the drain screw on the bottom of it

[daggie]

over heating

[Bulldog67]

you sure it runs the same on lpg v petrol?

Had that on mine but it was a single spark plug not copin with lpg

[Hillbilly]

 
Had the same but it was an HT lead not coping with LPG at high speed. Fine with petrol. New set of leads, problem sorted.

[Plank]

you sure it runs the same on lpg v petrol?

Had that on mine but it was a single spark plug not copin with lpg

Interestingly I give it a blast 1st thing this morning at 90 mph on the motorway on petrol and the light did not come on.