Ok here's the deal... My black SC4 has been horribly sluggish lately (like.... to a crawl). I plugged my mt2500 into it to get some readings, but I do not have the factory specs to know what I should be seeing.

LOOK: http://www.lextech.org/images/stuff/scanner.wmv

I am not throwing codes, so if I can get the proper readings on what is on my display I can compare them to what I should be seeing. Since I am looking into the MAF and O2 sensors, I'd like to know what these should be reading.

Does anyone have the specs for proper closed loop operation on the sensors for a 1992 SC400 ?

 

Oh and if you guy's who have these can tell me a better way to use this, I'm kinda on the duh side with this scanner. I have only used it once. I remember we have some users here who have these or use them.

 

hey, no double posting... we have an edit function for that.

im going to take a shot in the dark here, but i think your on the right track. with the lean and rich readings i would agree that the MAF and O2 sensors are good starting points. i would also check the cats if stock... they could yield simmilar readings if clogged or just plain old. good luck, and if i get any better info, ill let you know.

 

Well, according to my other SC4 (also a 92) the readings I am getting are normal. The only thing that was off by just a tad is the A/FLeft and A/F right. On the gold SC4 at IDLE they were consistently 3.5 with a burst to 5.0 v. On the black one they were 1.75v to 2.5 v at idle with rare peaks into 5v.

I'd still really like to know the proper readings, even though I have two cars to reference.

My "problem" is mainly that the car doesn't seem to have the power to hold it back from shifting to another gear while accelerating. Whereas in my gold Sc4 it will hold until redline, in my black one it doesn't even get to redline - it is not pulling hard enough before it shifts. Both have shown 72% throttle capability (nearly wide open on any SC is 70%) so it is not throttle failure. The car drives "ok", but it used to KILL the gold one and now it is the other way around so with the no redline shifting thing I can tell it has slowed down a bit.

 

slushbox taking a dive?

 

Nope, I can test that also the tranny is shifting at 2v increments as it is supposed to be doing with proper delays.