I've posted about this all over the place. It used to just have a hesitation around 60mph and then a couple weeks ago a bit of a bounce at cold start idle.
I took off the ECM and cleaned the throttle body, replacing the MAF at the same time--just the sensor module itself, not the body.
After doing this, now my starts are terrible, especially the colder it is. Way worse than before. If I don't give it heavy throttle right @ start, it'll bounce around between 200 and 2500 rpm's and stall over and over until it warms up and then be mostly OK. If I force it right at start to hover at 3500-4k rpm's for about 30 seconds, it's mostly fine, although laggggggggy at speedy. No more bouncing at idle, no more stalling.
I've been thinking it's the TPS, but now I'm wondering if I didn't get a bad MAF, certainly cleaning the throttle body shouldn't have made starting WORSE. It's also running SUPER rich. I have NO CODES. Car has ~200k miles. Using a bluetooth OBD and the Torque app, throttle position and vacuum look good.
I found this thread and tested voltage on pin 4, and I'm getting 5v even regardless of throttle position, all the time, which says WOT if I'm understanding correctly, which seems that it would drown a cold motor.
Before I go spend this cash again, I'd love to hear anyone's input.
1999 S80 Extremely hard start then runs mostly OK
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