IAC bouncing 0 to 1 at idle...
 

Had a board member over lastnight to give me a hand with the Whipple idle issues. I replaced the TP sensor and IAC motor on the motor.

We hooked the scan tool up and read the TP sensor , which read about .66 at idle. The IAC was bouncing between 0 and 1 count. The only time we saw the IAC motor counts go up was when we hit the throttle a little bit and it read between 20 and 32 counts, but that was just barely giving it throttle.

There were no error codes. Not sure what to make of it.

Anyone out there run into this problem before? Especially with a new IAC motor and TP sensor? Keep in mind there is maybe 2 hours on the new engine since i came off the dyno. When I put it in the water and try to shift it in gear, it dies everytime. If you goose the throttles once your shifting it in gear you might get lucky and keep it idling without dieing. It will however shift into gear with no problems on the hose, but thats becasue there is no load on the prop from what I can tell.

I wanted to thank Capt. Ross for taking the time to come to the house lastnight. I made sure the cocktails were there so he wouldn't have to rough it in the Texas heat!! :D

Now,,,maybe one day Dustin will email back and help me. :mad:

Re: IAC bouncing 0 to 1 at idle...
 

Hey there!! I talked to Dustin a bit ago - he gave some insight on things to check before getting into the ECM and working the timing and IAC speed - so!

Maybe if it's not to crappy Sunday - and I get that damn IMCO stripped we can try a couple of things at the river??

I'd call ya but every time I get a second some other a$$ is in my office wanting something.

Dustins ideas - unplug the CTS to trick the brain into full rich (Cold) work the timing at idle and see if there is a sweet spot (16 vs 8) If the timing thing works - we'd have to work on the ECM. Do you still have the specs on the cam??? You mentioned over .600 lift? Or was that "Is this our 6th beer?" LOL!

Thanks for the cold beverages!!

Damn - Here comes another pain in my .....

LATER!~!!!!!!

Re: IAC bouncing 0 to 1 at idle...
 

I'm there bro!

I'll call ya sunday morning and see if we might be able to hook up. I'm going to have to meet you at a ramp. I'll be paranoid to back it off the trailer. I'm chicken when it comes to going into docks not knowing if it going to die on me! :(

And your welcome for the drinks! Thats was a good excuse for me to drink to!! I have someone else to blame it on!!:evilb:

Re: IAC bouncing 0 to 1 at idle...
 

Maybe the throttleplates do not close completely, therefore the IAC does not go into operation until it is too late

Re: IAC bouncing 0 to 1 at idle...
 

From wht we saw on the scanner the TP reading was .66. This would tell me the blades were completely closed. I did however take the throttle body off and makes sure the blades were sitting on the blade stops.

We still could not ge the engine to idle below 1000rpm.

Re: IAC bouncing 0 to 1 at idle...
 

The IAC count indicates that the air is entering somewhere else than trough the IAC. Some other vacuum leak?

Re: IAC bouncing 0 to 1 at idle...
 

Dustin also thought there may be a possible air leak creating a lean condition - but with the size of cam - lack of manifold vaccuun - who knows. Whipple told me it was normal for one of these setups to run with a 0-5 count on the IAC. I'm betting vaccuum leak - but more investigation is needed.

BTW - Ya gotta love this quote - "OK-- Enough idle chit-chat. This ain't no fk'n retirement home..
Everyone!! Get back to your oars. The Captain wants to waterski."

Capt Ross

over and out!

Re: IAC bouncing 0 to 1 at idle...
 

I bets that where the bleed by rock filter on the bottom side of the Whipple comes into play....yeah ...I know.....back to work! :evilb: :D

Re: IAC bouncing 0 to 1 at idle...
 

Sounds like there is some type of intake leak or the throttle blades not seating. If you don't have any luck fixing it yourself I can fix it for you, if towing it up to the Austin area is not too inconvienient for you. I am a Whipple dealer, can reprogram the ECM and have a prop shaft dyno. I can't do it for free, but I'll get it right and not rape you. :D Dustin is always covered up. It works a lot better if the customer works through a dealer(usually whoever sold you the SC). Part of their responsibility is to help you with issues like this...at least that's what I do for customers I sell to. I just sold a Whipple to a customer in Colorado and I've been on the phone about 10 times this week answering installation questions.

Re: IAC bouncing 0 to 1 at idle...
 

Check the timimg first. I had same problem and thought it was IAC / fuel related. Timing was advanced 11 degrees too much.