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Old 10-09-2004, 01:06 AM   #1
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Default Scantool has strange results

I picked up a used PDA and Autotap from INTENSE and fired it up today with a buddy in Forest Park, IL. Well our findings were confusing....

At first the IPW bank 1 counts were REALLY low once the engine was at operating temp, we're talking down to the 20'*!

So I did a small reverse procedure on the TPS mod and brought down the idle voltage. Then the idle screw wouldn't change the voltage value after it was losened so much, so I move the TPS slightly to bring down WOT voltage a tiny bit. I got idle down from .71 to .63 and the IPW counts seemed to say at 47 at idle, so that'* an improvement.

Still one big problem. Why are my long term fuel trims still maxing out to 16.4 at idle? I can be cruising down the road and they will be between 8 to 10.6, but the second I let off the gas they peg 16.4.
We even slapped on a mini-AFC 2.0 and brought up the idle Hz values up and the trims were still high. However, the short term fuel trims seem "ok"...meaning they bounce around somewhat and when I continuously changed throttle on the road they bounced around from negative to positive and so forth.

We sprayed TB cleaner all over every vacuum line fitting I could think off and the idle didn't change at all, so in turn we couldn't find any leaks. o2 readings seem normal as they bounce all over, but could it still be going bad?

So who here knows what their IPW counts are and trim levels? Please post your values and give me some guidance of where to start testing/looking for causes of a high L-trim.
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Old 10-09-2004, 02:56 AM   #2
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Just to avoid any confusion. Kyle means IAC counts, not IPW.
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Old 10-09-2004, 02:06 PM   #3
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NOt sure what to make of this. I'm kinda OBD2 dumb, but some of it applies. I'm watching. I'd really like to know what this is.
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Old 10-09-2004, 03:28 PM   #4
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Two questions:

1.) Is the rumor true that for some reason Bonnies ignore an AFC?

2.) Would I benefit from a CASE learn?
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Old 10-09-2004, 06:06 PM   #5
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hmmm, are you sure that your IAC is working correctly? You might want to take apart your TB and clean everything.
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Old 10-09-2004, 06:12 PM   #6
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Never touched an IAC before, I can just unscrew the 2 screws and clean it with TB cleaner?

Anyway I did some quick/rough Autotap runs by looking at the PDA while flooring it. This is what I found out:

o2'* seem low at WOT: 880-910
KR was all over from 1.9 to 4.1, but not bad for how small of a pulley I have on compared to my mods.
Ignition Timing Advance: 50-90mph I saw it go as low as 7.0

Little thing I noticed, after going WOT and letting go of the gas at the top of 2nd (100mph) all numbers on the PDA froze at 0 for some time or until I tapped the gas lightly.
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Old 10-09-2004, 08:55 PM   #7
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I changed my oil today and took the IAC out...well it was BLACK! I used some TB cleaner on it and cleaned some off the gunk off. Good news is my IAC counts went up from 37 to 41ish at idle. But I'm throwing the P171 code like a ****. Bad o2?
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Old 10-10-2004, 04:29 AM   #8
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Quote:
Originally Posted by Allmachtige
I changed my oil today and took the IAC out...well it was BLACK! I used some TB cleaner on it and cleaned some off the gunk off. Good news is my IAC counts went up from 37 to 41ish at idle. But I'm throwing the P171 code like a ****. Bad o2?
What is the P171?

I would still say to clean out your entire TB, its cheap, at the least you get better throttle response, and relativly easy.

Any way to check if the O2 is working right with the scantool?
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Old 10-10-2004, 05:08 AM   #9
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TB is cleaned twice recently...thats not it.

P171 is lean condition on bank 1.

I think the o2 is a little quirky because I should be getting higher o2 numbers at WOT.
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Old 10-10-2004, 12:37 PM   #10
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would switching the two O2 sensors do anything?
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