Petergg Posted April 19, 2006 Share Posted April 19, 2006 Hi, My 90 has a miss fire only in low box, have changed the ECU and no faults found on old one. Any ideas please? Cheers Peter Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 19, 2006 Share Posted April 19, 2006 my guess is something to do with the different throttle mapping used in low range try disconnecting the hi-lo range sensor on the t/box and see if that cures it? not sure if it is "normally open" or "normally closed" switch, it may default to low range so you may need to short the wires to get high range throttle map it might be a cheap solution to do this if you can live with the jerky throttle in low range! Quote Link to comment Share on other sites More sharing options...
Petergg Posted April 19, 2006 Author Share Posted April 19, 2006 my guess is something to do with the different throttle mapping used in low rangetry disconnecting the hi-lo range sensor on the t/box and see if that cures it? not sure if it is "normally open" or "normally closed" switch, it may default to low range so you may need to short the wires to get high range throttle map it might be a cheap solution to do this if you can live with the jerky throttle in low range! Thanks, it is an Auto so should be OK re jerking will have a look tomorrow. Peter Quote Link to comment Share on other sites More sharing options...
Petergg Posted April 20, 2006 Author Share Posted April 20, 2006 my guess is something to do with the different throttle mapping used in low rangetry disconnecting the hi-lo range sensor on the t/box and see if that cures it? not sure if it is "normally open" or "normally closed" switch, it may default to low range so you may need to short the wires to get high range throttle map it might be a cheap solution to do this if you can live with the jerky throttle in low range! Just to let you know, it was a broken earth wire from low/high switch, it also made my speedo act like a rev counter. The switch is normaly open. Cheers and thanks for input. Peter Quote Link to comment Share on other sites More sharing options...
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