mrmint69

I got the plug and ran a scan of the car. It had a few things i would like to know it they are a problem. First is the knock count said 167. Next the IAC was 160. O2 right reading was 100-900 moving up and down. The left side was only between 930-960. I know almost almost nothing, but these look like possible problems that need to be fixed. If someone can tell me the good from the bad and how to fix them. Thanks in advance. Both 02's were replaced 2 weeks ago after waiting 2 weeks for the headers to burn off any coating. Is there somewhere i can go and see what a perfect running car will like like in a scan or the acceptable range for different sensors?

shoebox

The IAC is trying to add more air and is pegged out because the computer senses you are running rich. IAC reading should be in the 20-40 range at hot idle. The knock counts doesn't really mean anything other than the total number of occurrences since the last time the register rolled over.

Injuneer

Shoebox took care of those. Absolute value of knock count is not important, its how fast it changes. Some change is actually normal on startup, for example.

Left side is screwed up, if the engine was in closed loop, and not in PE mode (~WOT). Both sensors should be jumping up and down rapidly. May be a sensor problem, wires may be shorting, allowing the heater circuit voltage to bleed through to the signal wires, or you may have something causing it to run pig rich on the left side.

http://members.aol.com/InjuneerZZ/ScanMast.htm

mrmint69

Well i am glad to hear the knock count doesn't mean much. I got 167 knock count 3 days ago and yesterday it said 25000+. That would have woried me.

Injuneer

But you do have to look at WHEN it changes and how fast.