What Causes K-Light To Come On?

[James_K 6 1 Cars]

Does anyone have a comprehensive list of what faults/sensor problems would cause the k-light to flicker on and off?

 

Basically mine comes on at around 5k revs at which point the car hesitates horrendously, other than that the car is ok.

Unfortunately I don't have a diagnostic port on the loom so I can't read any fault codes.

So far I've changed the folowing:

 

Fuel filter & pump - pressure reads a consistent 3 bars

Coils & plugs

Injectors - cleaned & tested

MAP sensor

Cam & crank sensors

Exhaust system

 

All of the above has made no difference whatsoever. The only thing I can think is to get the loom tested to make sure there are no electrical breaks within it, but it anyone can confirm what issues would cause the k light to come on that would be useful.

 

thanks

[welshpug 1,657]

which engine? probably worth adding a diag port.

[James_K 6 1 Cars]

Gti6 engine - should have made that clearer. How hard is it to add?

 

thanks

[welshpug 1,657]

depends on your skills, its just a few wires and a plug, if it was a phase1 306 loom also it will already have a plug near the ecu.

[Henry Yorke 269 3 Cars]

Try lambda sensor too. I know my CTI on Motronic 3.2 used to flicker under heavy load up a hill. It also did it when it was running out of fuel too!!