My IAC counts are 21. Is that right??/ if not how do I adjust them??/ Also my TPS was .60??/ Is that good?? thanks guys!!!

 

I believe 20 steps is actually normal for idle, I may be wrong, anyone want to chime in here?

IAC is computer controlled. *** EDITED OUT ***

Now if your IAC is moving and the computer is controlling it, you probably have a vacuum leak.

As for the TPS normal idle voltage is .54.

I would check for vacuum leaks before deciding to replace electronics. The computer may be compensating for them.

More of a description of your problem will allow people on this board to help you further.

 

Your IAC and TPS look good to me, especially considering you don't have the stock throttle body. IAC counts are adjusted on the fly by the computer. There is no "setting" and can be in a range from 15-40 or more/less at idle.

 

if that reading was taken with the car warmed up your looking very well. I see nothing wrong with those numbers at all

 

how would i get those readings on a obd2 car?

 

How do you obtain the readings or how can you get your counts to that range?

 

Im pretty sure he wants to know how to read what step the IAC is at. I'm not sure what to do about a OBDII equipped vehicle.

 

The counts are read with a scanner, just like any other car.

 

Both the IAC counts and the TPS voltage are within the "normal" readings.

IAC should be in the range of 20-40 counts at idle. With an aftermarket throttle body, you typically find the stop screw is out too far, so you have to back off on the stop screw slowly, until the RPM comes down to spec (or your reprogrammed value), then us a scanner to read the IAC counts and make sure they are in the required range.

After you have the IAC counts under control, you need to verify the TPS voltage. This can be read with either a scanner or a voltmeter. The LT1 PCM accepts any closed TPS voltage between 0.20-0.90V. Some people feel they get better results with values in the range of 0.50-0.67V, and just about every stock setup I haver ever looked at was around 0.67V. If you are not within range, or you feel you want to adjust the TPS voltage, you need to slot the screw holes in the sensor so it can be rotated.

The "reset" procedure for the IAC counts is outlined on Shoebox's website. I personally have never heard of the "short the pins" procedure.... that sounds like something that was used in the 3rd Gen ECM's. Shorting the pins on anything after 1993 accomplishes nothing that I am aware of, but I would like to learn more if there is such a procedure.

 

Well, I was referring to what "tool" to use . Not sure if he can use datamaster or whatever, I know they sell those $189 obdII scanners. I know you need a scan tool .

 

Woops, your right... I forgot about that. Please disregard the IAC reset method I posted.

 

so are you saying any scanner will read those readings? like say the scanner that autozone uses? if so please let me know.

 

No the autozone scanner can only grab trouble codes the PCM spits out if your referring to thier free service.

 

Sure, you can use Datamaster. It is a scan "tool". Just beware that some "tools" are merely code readers and not scanners (like what was mentioned about Autozone).

 

Thats just it, I was unaware if it would work with OBDII, I always thought the data stream was encrypted.