GST dies

[Wells]

One more question ..

Ever since I got my 6-bolt in, my car has died after coming to sudden stops. It also happens when I get on boost and then put the car in neutral. For example, I'll do a third gear pull and then put it in neutral .. The rpms will drop and then the car will die, I have learned to keep it in gear (which it doesn't die afterwards).

I'll reverse out of my driveway, and I have to keep the rpms up to keep it from dying .. then I'll drive down the street and then slow down using first gear .. and it will idle perfect.


The same will happen when I go to a light, as long as I downshift .. It's fine, but if I have to suddenly stop and don't have a chance to downshift .. then I stop with my ebrake while keeping the rpms up .. or it dies ..

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I've been told that the dejon intake might be the problem .. I was considering getting getting the gm maft setup, but didn't want to cut into my uicp unless I had to (because I would set the blow through setup so I could vent my bov if I did that) I just didn't want to spend the money on the gm maf and the translator, and then have v3 of dsmlink come out and have that part of the new program ... and yes I have zip ties/wire holding most of my sensors together ..

I'm replacing my b&m fpr, with an aeromotive one as soon as I find all of the fittings, and I'm hoping that might be the cause.

 

[Talon-96]

Could be as simple as adjusting the idle

 

[Wells]

It idles perfect when I first start it up .. when I come to a stop (after downshifting) .. and I've adjusted the biss screw up and down.

 

[GSX'er587]

Im curious to know what this could be as well. im having the exact same problem when putting the car in neutral. This is all happening after a full dyno tune session and a boost leak test.

 

[brute]

Maybe your recirculation hose is leaking or isn't connected right. So you're basically venting, and right when it blows off, the A/F gets so rich that the car dies.

 

[90mitsu3clipse]

Yea... I think its something to do with vacumm.

 

[Wells]

I have my bov set to where it doesn't open up until 5 psi or so .. and I don't think that it's leaking because I've done a boost leak test (and found a few small leaks that I'm in the process of fixing) ... The recirulating hose isn't leaking, and can't really be connected wrong.

 

[nightspeed87]

Maybe your recirculation hose is leaking or isn't connected right. So you're basically venting, and right when it blows off, the A/F gets so rich that the car dies.

That could be possible even though I know several ppl who vent on stock mafs and it doesnt do this, and besides when i had an N/T dsm it did this...
( But ) your theory could be true thoug because a vacuum leak would lower the idle a little.
Something else that might sound weird ( which probably doesnt a apply to a 2g air sensor
I hooked both my fans up to stay on all the time soon as the ignitions on, and one time I placed my intake differently trying to make the intake arm aim down after coming off the turbo (which was a stupid idea) and it was infront of the blowing fans ( wasnt intentially trying to get the fans blowing on it ) and with the fans blowing onto the filter I think the mass was picking up the fan air and was throwing off the idle ( was doing exactly like he explained... ) But that may not help for his problem.

Id just look for leaks somewhere, ( like intake manifold/ pcv/ vvb/ intake/ head etc. )....

 

[Wells]

I was also told that the dejon pipe with the stock maf was causing it, and that a gm-maft setup up would probably fix the problem .. but I didn't want to spend the 250+ if that wasn't the problem.

 

[gernoff]

Check to make sure your idle position sensor switch is working / not shorted.

 

[tallywacker]

If you think its the dejon intake put your stock hose on and see what happens. I had this happen to me but it was the cause of the wonderful leaky cap syndrome on 1g ecu's

 

[UMR98GSX]

What flywheel are you using? People have had similar problems when using the Fidanza aluminum flywheels and a stock idle.

I'm curious... how in the world could a hard intake pipe cause a car to die?

 

[Wells]

The problem is probably an abnormally high airflow reading on throttle lift. Many users have reported this problem with various configurations, but the Dejon intake pipe is a common item among many of them.

This came from the dsmlink forums. I'm not exactly sure what he meant, though.

 

[UMR98GSX]

It sounds to me that they are saying the Dejon pipe flows SO well that when the throttle is quickly lifted the MAS is overun with air. I still don't understand why this would cause the engine to die. It seems like if the MAS was reading more air than was needed then you would just run pig rich but I don't know about so rich that it would kill the motor.