I have spent hours possibly days on vortex searching and trying to trouble shoot my issues. i have learned alot but not enough. this may be long but please read and please help where you can. Thank you
the patient : 92 golf. I dropped in a 92(ish) 2.0 16v motronic ( originally passat).
donor car was an 89 gti which the po gave up on.
got er runnin poorly and i have just been chippin away over the past few months. i was getting decent fuel milage but now its just brutal. the exhaust just reeks of gas and i have a difficult cold start unless i richen the mixture a tad. on top of that a high idle, around 1000 at start and straight up to 2000+ when she warms up ( blippin the throttle does nothing ) low power ta boot
o2 sensor 3 wire at first but i just put in a 4 wire
pluggs (3 electrode)
injector o rings
maybe others? bad memory
New Used parts:
fuel dizzys plural
ive checked air sensor plate for free play and rest position, changed the timing belt. i did a smoke test for vac leaks with no results( doesnt mean there isnt one but none that i can find) there are almost no vacuum lines. one from the diaphragm pr to the intake box, the break booster and the large ones to the isv and the cc breather and the ones that lead from those. the rest have been eliminated. maybe i should have more ? the evap system is not connected any more, no ac
the part that bothers me most is the Ma reading i get from the dpr. its supposed to be around 2.5 but im getting reading like 6-7 which would suggest im getting a lean condition(my exhaust beggs to differ) but no matter what i do to the mixture screw it wont sit right. i can lean it to the point where its stalls and the reading is always in the 5-7 range and i can drown it in fuel but it'll never go even as low as 3s.
while running, if i unplug the 02 signal wire there is no change in the reading or idle
if i unplug the isv there is no difference
if i unplug the cts same deal
but if i unplug the throttle body switches the idle lowers to around 14 1500, now if i plug or unplug the isv there is a change. pluged in it'll sit around 1100 ( this is the case with two different sets of switches. ive checked for voltage, continuity and resistance between ground ecu and power on all of the sensors while wiggling the harnesses. and yes the throttle is making good contact with the idle switch. if i bridge the idle switch the idle rises? fvck me whats going on?
i have 2 other ecu s that i have tried but both of them will not allow the car to start unless they are so rich that you could light the exhaust on fire. i can lean it out with the car running but then it wont start again unless you richen her up again. i even tried running her around the block a couple times with my flammable exhaust to try to make the comp learn but still the same result.
so back to the original ecu
im so lost
please help! oh and dont tell me to clean the isv lol
i must have missed something (small hopefully)
is my ecu housing supposed to have a ground of its own?
can someone give me the resistance the csv should have over the 2 terminals?