hi guys,
ok, it's the 91 xj 4l aw4:
idle is always (cold or hot engine) at least at 1k, more often at 1.25k - 1.5k
when starting up, it goes up to 1.75-2k then dropping to the said rpms.
it's really annoying me - too loud, too much fuel / km, too much pull when on the brakes...
i checked the tps, it has exactly 5v supply, it starts & ends at the right voltage.
i can't find a vacuum leak. the iac is cleaned and works.
the plugs are rather brownish - indicating lean & hot running. the engine seems to get hot really fast (2-3 min to thermostat opening) but runs at the right temp. under all conditions.
can the engine management think it has to raise the idle (i.e. for the ac)?
switching the a/c on is making the rpm stumble for a fraction of a sec, so it is NOT running all the time...
something is fooling the ecu to raise the idle. any ideas as to what this might be?
thanks, guys,
micha
ok, it's the 91 xj 4l aw4:
idle is always (cold or hot engine) at least at 1k, more often at 1.25k - 1.5k
when starting up, it goes up to 1.75-2k then dropping to the said rpms.
it's really annoying me - too loud, too much fuel / km, too much pull when on the brakes...
i checked the tps, it has exactly 5v supply, it starts & ends at the right voltage.
i can't find a vacuum leak. the iac is cleaned and works.
the plugs are rather brownish - indicating lean & hot running. the engine seems to get hot really fast (2-3 min to thermostat opening) but runs at the right temp. under all conditions.
can the engine management think it has to raise the idle (i.e. for the ac)?
switching the a/c on is making the rpm stumble for a fraction of a sec, so it is NOT running all the time...
something is fooling the ecu to raise the idle. any ideas as to what this might be?
thanks, guys,
micha