Looking for guidance to decipher whether my loom is faulty or an injector , long story short my car has a lower AFR on the driver side bank in comparison to the passenger side causing det , the paperslip that came with my injectors say 11.5 ohm but not to what this measurement relates , am I right to take to take this as a measure of resistance ? , if so across which pins do I check, likewise I want to check the loom and will measure the resistance at the injector connector , what reading should I see and across which pins do I measure please.

 

Thanks

 

Sayers

The value you speak about is the injector internal resistance, to check the cable/ loom back to the ecu you will need to remove the ecu and do a one by one check of the cables, there should be no readable resistance, but there should be circuit continuity. The ecu outputs to the injectors is an earth trigger and is done by internal transister switching so again should have no readable resistance.

 

The AFR on the driver side bank in comparison you mention how have you come to this? o2 sensors can give bad readings causing issues but not seen them cause detonation, problems with plugs, compression figures, injector pattern can all cause issues but again not seen detonation as a result, ignition timing needs checking both at idle and constant high revs just to be sure the cas unit is not straying, have seen this before causing both retarded and advanced timing which can cause detonation.

 

 

Jeff TT

Hi Jeff the car went on the dyno in Howarth Doncaster for an independent check. the AFR was measured by the operator in both banks , all other parameters were also checked and found to be within an acceptable range . the only thing that wasn't correct at the time of test was the AFR on 1 bank. now I need to find out if I have an injector fault ( or partially blocked) or a loom issue.

 

Cheers

 

Sayers