LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

whatdouthink? My scan

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Old May 31, 2004 | 04:21 PM
  #1  
94zLT1's Avatar
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From: Chicago
whatdouthink? My scan

ok ran freescan for like 1minute on cold startup...

IAC position:130
MAP: .98
Barometer: .98
02 Volts: .004
Coolant temp: 40 C
Mas Air Temp: 3 C
Spark Advance: 29.0
Knock Retard: 0
Knock Couunt:154
Air Flow:11
Rich/Lean:0

how am i looking?
(i know the rich/lean and knock retard r good)
Old May 31, 2004 | 05:25 PM
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94zLT1's Avatar
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no one?
Old May 31, 2004 | 05:50 PM
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From: Indianapolis, Indiana
I'm curious about this too. My mastach cable is in the mail and when it comes freescan and datamaster will be getting some use.
Old May 31, 2004 | 09:23 PM
  #4  
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Looking at the car on cold start isn't going to tell you much. Under those conditions, its still in open loop, the A/F ratio is enriched for the cold start, the O2 sensors aren't working, the long term fuel trims are locked, IAC counts are raised to hold a higher idle RPM, etc.....

What problem are you trying to diagnose? That will tell you what kind of a scan you need. Then you need to look at a "log" of several minutes of performance under those conditions.

One thing that really stands out in you limited info is the MAP = .98 and Barometer = .98. Those readings are actually 98 kPa (kiloPascals) and the MAP reading is totally incorrect. At idle, even with the high IAC counts, the MAP should be closer to 40 kPa. When the car warms up, a reading closer to 33-36 kPA would be approriate.... although that's for a stock cam. With something more radical, MAP will be higher, bet at no time other than WOT will MAP = BAR.

For general info on interpreting scan data, try my online writeup:

http://members.aol.com/InjuneerZZ/ScanMast.htm
Old May 31, 2004 | 10:29 PM
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94zLT1's Avatar
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thanks for the link very helpful injunner...
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