IAC COUNTS datamaster

mpettograsso

mpettograsso

Doghouse Member
#1 - new throttle body and new sensors. cannot get TPS volts at .54 as recommended...it is either .53 or .55...does this matter?..seems to skip over .54 for some reason. if I had a choice should I go lower? or higher

#2 - IAC counts - they say should be between 30-40???. mine stays at 0 or 1. idle rpm is around 725 and runs ok. still a little rough, but what i think may be acceptable. Even if I crank it to about 900rpm, it only goes up a little bit. usually to 1 or 2. Is there another sensor that may need to be replaced? am i looking at the right number?

thanks
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: IAC COUNTS datamaster

mpettograsso said:
#1 - new throttle body and new sensors. cannot get TPS volts at .54 as recommended...it is either .53 or .55...does this matter?..seems to skip over .54 for some reason. if I had a choice should I go lower? or higher

#2 - IAC counts - they say should be between 30-40???. mine stays at 0 or 1. idle rpm is around 725 and runs ok. still a little rough, but what i think may be acceptable. Even if I crank it to about 900rpm, it only goes up a little bit. usually to 1 or 2. Is there another sensor that may need to be replaced? am i looking at the right number?

thanks
Click to expand...

You will need to adjust the throttle stop (decrease) to get more IAC counts.

The TPS is self calibrationing, their is no need to adjust it to certain voltage.
 
4C FED

4C FED

Absolutum Dominium
Re: IAC COUNTS datamaster

Maybe the wiring is backwards on the IAC.
What I gave you originally was how it looks like it should be wired according to the color codes. There is a high side & a low side to the IAC. What I'm saying is, the ECM is trying to push or pull the IAC but since it might be wired backwards, it's doing the exact opposite.
Try it like this:
Stock connector----------LT1 connector
A--------------------------------------------D
B--------------------------------------------C
C--------------------------------------------B
D--------------------------------------------A

Before these were a 1 for 1 match, now they're swapped.
 
Don W.

Don W.

Stab it and steer it
Re: IAC COUNTS datamaster

:rant: Regardless of mfg check that the throttle plates close completely without any binding. (This is what the idle screw is for then leave it alone.) Virtually no air is supposed to get past the throttle at idle. This allows the IAC to have control over your idle as its suposed to. I actually had to take my "rebuilt" TB and bevel the plates so they would close all the way (hold it up to the light and nothing except a little at the ends of the shafts.) and still open freely. I found a bit of a trick to doing this which I can try to explain if you'd like. End of :rant:

As mentioned check for vacuum leaks.

HTH
 
SBNova

SBNova

New member
Re: IAC COUNTS datamaster

My base timing used to be too high, which will make the engine idle higher with less IAC counts. Check into your base timing, should be zero.
 
Flyin Ryan

Flyin Ryan

hated cuz he drives fords
Re: IAC COUNTS datamaster

I can't really help with this thread but this thread made me go back and look at my iac's in my logs and I noticed that mine are anywhere from 2 to 25 LOL

so thanks for helping me realize another potential factor in why my idle is horrible
 
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