Originally Posted by BGTV8 (Post 1880091)

With the headlights on, I reckon that the ECU "saw" power in the brake light circuit as it is bridged to tail light circuit and the ECU interprested this circumstance as "the brakes are being applied" - the ECU won't permit mnre than nominal sustained throttle opening when it thinks the brakes are applied ... it will let you "blip" the throttle ina heel/toe maneuvre but will not supply sustained throttle opening when it believes you have applied the brakes.

Originally Posted by ChrisSlicks (Post 1880134)

:iagree:

Pulling the brake light fuse or disconnecting the brake lights (or in the OP's case fog light) disables the circuit.

Originally Posted by BGTV8 (Post 1880328)

Agreed ... but wold be a problem on the highway I suspect.

Originally Posted by ChrisSlicks (Post 1880338)

Yeah, would only do as a test, not a permanent solution :)