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2 Attachment(s)
IAC steps very high.
Alright, so I have been doing a bunch of reading and most people are saying, even with a cammed engine I should have about 50-60 steps on the IAC at idle.
I am seeing about 120-150 steps. If I force anything less with DVT, the engine immediately dies. What could cause this? I know I have a larger cam, but I have seen guys with larger or equal cams to me and they aren't this high on IAC steps.
Cam is Comp 230/238 .600 .603 @ 114.
Any ideas from latest logs?
Attachment 17523
Attachment 17524
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What intake and throttle body are you running?
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Stock truck intake and stock 78mm TB.
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You'll have to adjust the TB open some more in order to lower the IAC steps.
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I am in a 2000 Silverado. It doesn't really have a TB adjustment. It is a DBW.
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If it's DBW there is no IAC hence no IAC steps to count.
I don't think 2000 silverados came DBW????
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Some pre-2003 Trucks were DBW. If it is a 2000 model, then it probably uses OS12205612.
Take a look at the idle airflow values - generally these need to be increased slightly with a larger (non-OEM) camshaft. Start with B4307 and B4308 - then look at the corrections parameters if you are still having issues.
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Sorry guys, it is DBC. My bad. I have got the idle airflow values to where it idles perfectly driving and cruising, but I am still at 150+ on steps.
Here is latest log and tune.
Attachment 17549
Attachment 17548
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If it drives and idles fine, leave it alone.
If not crack the throttle stop open until counts are down around 30-50, be careful not to go too far or TPS volts may go out of range, (you may have to do a TPS reset) .
Then log and adjust Running airflow again.
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I agree if it runs and drives fine. Leave it alone. Don't get to caught up in the counts.