idle fuel trims

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sassanach

Well-Known Member
Posts
1,496
Location
trowbridge wiltshire
this is on my lpg'd 4.6 vogue,it keeps coming up with these faults,idle fuel trim bank 1 and bank 2 limit reached.however the o2 sensors are quite happy flip flopping between 0 and .8 volts so what's its problem?
 
More than likely the LPG is out of tune. The engine ECU will trim the injection times to allow for this but as you switch from petrol to gas the trims will be way out for the different fuel. You need to get some gas diagnostic software so you can watch the injection timing on both fuels and make some tweaks to the gas map and perhaps check the pressure on the vaporiser.​
 
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