Hello guys,
A little more help if you'd be so kind. IAC / Stepper / Log file related.
'95 spi, all sensors are new, all pins to ECU have been checked, vacuum lines replaced, inlet manifold cleaned, new gaskets, new coolant sensor, new throttle cable, brand new TPS. New O2. New 88 thermostat. Stepper motor checked resistance etc and the plunger lubricated / moving. There is NO sensor on the pedal end on this car. Plugs, leads are new.
- I can connect to the ECU with Webmemsfcr (by andrew jackson) just fine.
- Using the same cable, same laptop (windows 10) I cant connect using Leopolds mems-rosco3. It just gives an error something about the port being invalid (which it isnt). Im gonna try another laptop.
- Webmemsfcr seems to connect / work fine - but when you turn the ignition off, you lose connection and I have to restart the browser and connect again which is a real pain. I cant find the old non web version (github version has gone) - if anyone has a working link Id be grateful!
Ive done the ignition on, move the cam fully, ignition off to get the stepper indexed. The initial IAC value (which shows in a green box on screen by the way) always seems to show in the 90's....
First issue; No matter how long I run the engine for I dont seem to be able to get it past 85 degrees temp. Sat at idle for 20 mins, rev to 2.5k for a few minutes, go for a decent drive - still max 85. The CTS is brand new, just replaced one I thought was bad (but isnt), manifold isnt blocked. No air leaks, cable fine.
Second issue; IAC value. I have been trying to set the stepper value to 30-35, but no matter how hard I try I just cannot get the value to go lower than approx 45 with the engine up to temp at my max of 85. Also when I turn the IAC screw (ive had it all the way in, all the way out by the way), webmems doesn't immediately show the value changing at all (as I believe it should). The changes in values only seem to be reported when I drive it, or engine off and restart (pain).
Third issue; Car drives sort of ok, revs quite nicely BUT has a real hesitation / flat spot around 2-3k and when you lift off the throttle to coast - it seems (and sounds) like its "lumpy" / misfiring at these low revs.
The idle seems slightly high @ 1300 or so.
Lost motion gap is bang in the middle.
Lost motion gap is bang in the middle.
I wonder if anyone would be good enough to cast their eye over my last log file (attached), see if they can see anything obvious - and any suggestions on what I should do next.
Im wondering if webmemsfcr isnt reporting quite right.... Which is why I was trying to run mems-rosco3.
Thanks everyone for your time. Appreciated.
Attached Files
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2026-10-06-112732-99000203.txt 155.37K
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Edited by orac69, Today, 12:16 PM.
