2G Idle with 272's, no IAC, auto tranny Car Dies when going into gear

[M4s73r]

Hey guys. Just curious what some of you guys are running for idle. I'm having issues with it stalling at a stop in gear. Idle in park is 930-960 idle in D is around 450-500. I'm playing with it trying to find that happy point. Just curious what some others have found to work

 

[bryanwheat]

Running an auto transmission and no iac is going to cause that. You need something to increase the idle when the car is in gear or else it will bog down. Having the bigger cams will only add to the problem.

 

[M4s73r]

I'm aware of that. Thought about throwing in a iac from a mustang. Open to suggestions. Read somewhere that idling at 1250-1300 will fix it but that seems awfully high

 

[bryanwheat]

What throttle body are you running?

 

[M4s73r]

S90 74mm.
EXTREME PSI : Your #1 Source for In Stock Performance Parts

 

[bryanwheat]

It appears that the stock fiav/iac housing should bolt right to that throttle body. Are you just running a block off plate on it right now?

 

[007jimmy]

I have my idle set at ~900 in park and in D its ~7-750. When i installed my cams (264/272) i had to readjust my idle or the car would die. But i still have my ISC. You could get an adapter to run a stock ISC,
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Or you could make your own:
http://www.dsmtuners.com/forums/art...dd-dsm-iac-any-aftermarket-throttle-body.html

 

[M4s73r]

Bryan- yep just a block off plate. It's what came with the car. When I bought it there was no iac.

Jimmy- don't really want a water cooled iac.

 

[bryanwheat]

Bryan- yep just a block off plate. It's what came with the car. When I bought it there was no iac.

Jimmy- don't really want a water cooled iac.

I'd just find a stock 91-99 lower housing and iac valve. The coolant lines have nothing to do with the iac or cooling the throttle body on these cars. It is for the fast idle air valve which idles the car higher when it is cold.

 

[007jimmy]

Jimmy- don't really want a water cooled iac.

Ummmm...... Nothing i posted has to do with coolant.

The FIAV flows coolant. The ISC is air only

 

[M4s73r]

But don't both of them bolt to the tb? I don't really know car didn't come with either

 

[bryanwheat]

But don't both of them bolt to the tb? I don't really know car didn't come with either

The fiav is built into the lower housing. The iac bolts to the housing. You can block off the fiav section in the lower housing and run just the iac so that you don't have to run the coolant lines.

This is what you need along with a new gasket and a good iac valve.

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[M4s73r]

Ok makes sense. Until I can find said parts/afford them what can I do in the mean time

 

[bryanwheat]

Ok makes sense. Until I can find said parts/afford them what can I do in the mean time

Your only option at this point is to just turn the idle up a hair. Try to make it idle around 1000 and than it should be around 800 at idle in gear.

 

[M4s73r]

Thanks for the help.

 

[Wildside22]

Set your car to idle at 900rpm in N.
Open the DA tables in DSMLINK to the TmngMaxOct tab and see what box the car is idling in while in N
Then hold your foot on the brake and put it into D and see where it goes.
Repeat this a few times to make sure you can see what 2-3 boxes it is using.
Then add a tick or two to the load cell that the ecu is using when you have it in D with your foot on the brake.
Take note of how the car reacts to this timing change.
You will have to shut the car off each time you go to make a save in the DA tables.
Once you have the car behaving the way you want it to behave go take a drive that has a few stop and go's and see if you like the result.
Rinse and repeat until your happy with it.

Post up your results.

 

[M4s73r]

RESOLVED!!. That did the trick. Happy as a fat kid with cake. Thanks Wildside.

 

[Tiki2777]

The fiav is built into the lower housing. The iac bolts to the housing. You can block off the fiav section in the lower housing and run just the iac so that you don't have to run the coolant lines.

This is what you need along with a new gasket and a good iac valve.

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Or you could not waste the money on a blockoff or bypass plate and Literally just loop the coolant lines together so that they dont touch the throttle body at all. You need the IAC particularly if you want to DD your car. Some have gotten away without it, but I wold definitely not recommend it.

 

[M4s73r]

I suppose you could do that. Couple of ticks in the DA Tables fixed it for me.

 

[M4s73r]

No boost leaks,
no FIAV or ISC (block plate)
Sitting @ idle and driving, runs like a champ. Putting it into reverse or coming to a stop it just dies. I watch my WB and it looks like it goes lean right as its dying. I have no clue. Car idles fine, drives great. When i put it into drive or reverse it dies. Ive fiddled with the DA tables for timing and fuel and cant get a change in this area. Any thoughts?

 

[tc1tyler]

Try cleaning out the throttle body and the intake. My old 97 gst had the same problem an that seemed to help it

 

[M4s73r]

both are brand new. s90 TB, and sheetmetal intake.

 

[Wildside22]

He has a new tbody and intake manifold, so I would think they were ok. I would maybe lean more to the torque converter locking up at idle for some reason?

 

[Cdc1221]

No isc with auto equals hella bad time idling in gear. The isc is designed to control idle under all circumstances. Youve taken away the ecus ability to do this, so you have to manually raise idle until it will idle in gear

 

[M4s73r]

I didnt have this issue till i put in the new MAF, Injectors, Cams and Turbo. And then i didnt have a ISC either.