Would one of you scan tool experts care to take a look at my scan data and comment about the numbers and what problem(*) they may indicate? The only symptom I know about is a rough idle, and it'* been getting progressively worse over the last few weeks. There are no error codes except for an occasional code 58 which doesn't appear to be real and seems to be a known problem on the '92.
The car is a '92 SSE supercharged, and the measurements were taken at idle with the engine warm and my foot on the brake.
Thanks!

Actron CP9110 with CP9111 cartridge (firmware v2.0):
Batt: varied between 13.4 and 13.7 volts
BLM: varied between 142 and 149
BLM Cell: 16
Coolant: 208 degrees
EGR sol 1: off
EGR sol 2: off
EGR sol 3: off
ESC counter: 0
Exhaust o2: varied between lean and rich
IAC posn: 30
Idle Req. rpm: 625
Integrator: 127
Knock Ret: 0
Loop Status: clsd
MAF (gr/*): varied between 1089 and 1110
MAT: 115 degrees F
O2S: varied between 300 and 800 mv
O2S Crosscounts: varied between 11 and 17
Quad Driver 1: bad
Quad Driver 2: good
Spark Adv: 24 degrees
TCC Applied: no
TCC Brake SW: on
TCC Slip RPM: 256
Throttle (%): 0
TPS Sensor: varied between .39 and .41 volts

OTC Mind Reader 3750:
A/F Ratio: 14.8
Batt: varied between 13.3 and 13.6 volts
BLM: 144
BLM Cell: 16
C/C Error: 1
Coolant Temp: 98 degrees C
Driver SS: Norm
EGR sol 1: off
EGR sol 2: off
EGR sol 3: off
Engine RPM: varied between 626 and 671
IAC: 31
Idle rpm: 62 x10
Integrator: 131
Knock Retard: 0
Knock Signal: no
Loop Stat: clsd
LV8: varied between 38 and 41
MAF: varied between 4.19 and 4.28 g/*
MAT: 47 degrees C
O2 Cross: varied between 16 and 21
O2 State: varied between lean and rich
O2 Volts: quickly varied between .28 and .76 volts
O2S Crosscounts: varied between 11 and 17
PRNDL Switch: INVLD
QDM 1(A): high
QDM 2 (B): low
RAW Servo: 54
SHT Wire A: high
SHT Wire B: low
SHT Wire C: low
SHT Wire P: hi
Spark Adv: 23 degrees
TPS: .38 volts
Troubl Code: no
Vats Sys: Yes
Weak Cyl: None

It seems the MindReader provides a little more data, and it'* odd that the MAF readings are so different between the two scanners. According to the factory shop manual, the MAF readings should be around 4.2 g/*. I also noticed that the Actron reported Quad Driver 1 to be bad, but I read on this newsgroup that this appears to be a software problem with that scanner when the brake is applied. And it also seems odd that the MindReader reported the PRNDL switch as being invalid.

It'* hard to say, but everything SEEMS normal. Unless you can duplicate conditions perfectly, it'* hard to compare both scans.

The other thing is things change drastically once the car warms up.

The code 58 is a known bugin the 92 PCM, and the QDM fault is known to be a bug when the brake is pressed, which it was in your case (CC brake sw applied).

The OBD1 PCM is not as easy to troubleshoot from. I'd be looking at cleaning the TB and IAC sometime soon.

http://www.bonnevilleclub.com/forum/...368&highlight=

Check out the thread here being discussed.

I removed and cleaned the IAC and MAF and then removed and cleaned the throttle body not long ago. Yesterday I removed the honeycomb screen and looked in the throat and it still looks pretty clean.

I know; I made that post but I was hoping the scan data would get more visibility as a separate post.

I finally found the cause of the rough idle and fixed it.
I replaced the supercharger base gasket and tightened the vacuum block on top of the supercharger. The gasket appeared to be intact, but I did notice that one of the supercharger mounting bolts wasn't as tight as the others were.

Now the engine runs like it did when I bought it.