97 megane coupe 2.0 16v f7r
sudden onset problem
stalls when coming to rest and changing gear.
at startup will not idle without throttle.
will idle rough then revs will drop to 0
after 30/40 seconds will keep running but is very lumpy and revs fluctuate between 1000 and <500
missfire?lumpy running below 2.5 revs but clears at higher revs
seems to be running rich at idle
changed coil pack for s/h - no change
changed plugs - no change old plugs were all black and sooty
cleaned icv - no change
with stepper motor removed and valve manually activated the rough idle and missfire is still present
changed icv for s/h - no change
cleaned crank/flywheel sensor (tdc?) - no change
cleaned camshaft sensor - no change
injector cleaner - bit of improvement in lumpyness/drivability when warm
re terminated the 3 wires at front bottom of block - (all onto the stud earthing point as the torx bolt was not removable) no change
cleaned throttle body - idles a bit better but still really rough
blocked off egr valve - no change
i have also used several cans od wd40 on all the hoses/pipes but no joy
have ddt2000 and xr25 with vagcom lead but am struggling to understand them!
no faults registered - injectors seem to be firing with long duration at idle (9000ms?) and duration drops with revs (3-4000ms?)
temp sensors seem to be outputting ok values
map semsor seems to be doing something
lamda seems to be outputing a signal
any pointers would be most appreciated
thanks
mel
sudden onset problem
stalls when coming to rest and changing gear.
at startup will not idle without throttle.
will idle rough then revs will drop to 0
after 30/40 seconds will keep running but is very lumpy and revs fluctuate between 1000 and <500
missfire?lumpy running below 2.5 revs but clears at higher revs
seems to be running rich at idle
changed coil pack for s/h - no change
changed plugs - no change old plugs were all black and sooty
cleaned icv - no change
with stepper motor removed and valve manually activated the rough idle and missfire is still present
changed icv for s/h - no change
cleaned crank/flywheel sensor (tdc?) - no change
cleaned camshaft sensor - no change
injector cleaner - bit of improvement in lumpyness/drivability when warm
re terminated the 3 wires at front bottom of block - (all onto the stud earthing point as the torx bolt was not removable) no change
cleaned throttle body - idles a bit better but still really rough
blocked off egr valve - no change
i have also used several cans od wd40 on all the hoses/pipes but no joy
have ddt2000 and xr25 with vagcom lead but am struggling to understand them!
no faults registered - injectors seem to be firing with long duration at idle (9000ms?) and duration drops with revs (3-4000ms?)
temp sensors seem to be outputting ok values
map semsor seems to be doing something
lamda seems to be outputing a signal
any pointers would be most appreciated

thanks
mel