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How to read aldl log?

I've checked the vacuum lines and replaced a few. This morning I disconnected the air pump diverter valve and plugged the vacuum line to it, but still code 32. There's no corrosion on the ecm or connectors, I didn't pull the prom and check it but I will. One reason for getting the prom at the junkyard is I want to get rid of the california tune.
 
I guess one possibility for a vacuum leak would be my tbi has slop in the throttle shaft. Not sure if its enough to cause problems.
 
michael0584 said:
I guess one possibility for a vacuum leak would be my tbi has slop in the throttle shaft. Not sure if its enough to cause problems.
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I had a really bad throttle shaft on one of my Q-jets. While it was not bad enough to make the engine run poorly, my idle RPM wasn't consistent, because the throttle never returned to the exact same position. Probably not the cause of your issue, but if the TPS readings aren't consistent when you stab the pedal and then let off, it should be repaired.
 
Worn throttle shaft is a vacuum leak. IAC is a controlled vacuum leak. PCV valve is a controlled vacuum leak. What was your IAC counts at warm idle?
 
With the engine somewhat cold it is 46 at 900 rpm. I noticed today when I started it at work the idle was a little erratic but seemed to line out.
 
I haven't looked at your data but that idle is way to high yet the IAC could be correct at 40 for idle. Are you sure your throttle linkage is returning all the way?
 
Most of your data looks good. You go max lean at WOT but what I see that may be causing your idle issue is the TPS reading. Sometimes it is .2 at idle but most of the time it is .7 If your throttle is not returning all the way this shows it and could be why your idle is to high.
 
When I started the tps was -.3 I adjusted it to .54 volts with my voltmeter but the ecm shows .2 so I need to back off alittle. I think the slop in the shaft is causing it not to return all the way sometimes.
 
I have no idea if it could affect anything but my speedometer is way off. 20% fast. If you look at the log in spots it shows 90, but actual speed is around 72. I think someone put the wrong speedo gear in the transfer case. I've noticed with the code 32 it seems to show up more at faster speeds or maybe its just the higher rpm. code 13 seemed to show up slower.
 
ECM doesn't care how fast the vehicle is moving, at least for anything I can think of. It's essentially just to help the engine determine if it's decelerating, idling in drive, etc.
 
I struck out at the junkyard, I did get a egr solenoid, but still got code 34. I checked all my vacuum lines and didn't find any leaks. while I was looking around, the air hoses for the smog diverter valve didn't look right. I swapped the hoses and they look right now. Its always been this way never paid any attention to it and I don't know if it would affect anything. basically I guees it was pumping air into the air cleaner when it was supposed to be pumping it into the exhaust and vice versa. I don't know if this could cause the codes???
 
I went 3 days driving it and no codes then they started again code 13 and 32. went on a 600 mile trip and averaged 10mpg. I've checked it before and got 15 average with mixed driving. this trip was mostly interstate. So something is definitely wrong here. i'm wondering if the cat may be partially plugged.
 
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For the life of me I can't recall what you are looking for with a plugged exhaust. You can use the MAP reading as a vacuum gauge though, that I know.
 
I just want to check it cause I'm really just pulling straws at this point. It used to smoke really bad cause the drains were plugged in the heads. All that oil going through the cat makes me think it may have plugged it up. The exhaust is extremely quiet except you can hear an exhaust leak, but out of the tailpipe its quiet and it has a small muffler. It just seems to quiet. I can just imagine that maybe with a plugged exhaust it could through off the o2 and cause code 13 and through off the egr causing code 32.
 
Those readings don't look right to me. If the atmosphere pressure according to the MAP is 100, then the 30 at idle seems right but the 90 at 2300 rpms seems wrong.
 
Have you been able to find the voltages that correspond to vacuum? I KNOW somewhere (thirdgen.org?) I saw a GM manual page for troubleshooting MAP that had a little chart in the corner with MAP voltage equaling Xpsi.

Can you see MAP voltage in your program, or just the numbers you posted?
 
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