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Old 05-10-2008, 08:41 PM   #1
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stalls and wount idle

since day 1 of the PC the svt has been stalling and does not idle for anything, i cant seem to figure out why. it only happens when you let out the clutch at a lower rpm or the rpms drop to fast at a high rpm. i did some research and i came up with a few things that could be causing this...

ISC/TPS could be bad.... it cant be because when i put the car back to stock it runs like a dream

i did new (AZFS22C) plugs gapped them to .35 .40 .45 .50 .... and still the same.

new fuel filter... no change

the one thing i think it could be is the diverter valve. since the DV is always open when the car is in vac and lets out all the excess air, and only closes in boost, so when its time for the car to come to an idle all the air is being blown out the DV instead of going to the engine and is starved for oxygen resulting in a stall.

soo does sound like it could be the problem or do i have no idea what im talking about.

any ideas will be helpful


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Old 05-10-2008, 10:30 PM   #2
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I take it you have not gotten a tune for this yet. If you have gotten a tune then your tune is messed up.

When you are driving Is the car fine?

when you have the car in gear and your driving and you go just a tiny bit into throttle does the car bog down really bad and go way lean?

More than likely it is a big whole that is in your tune in between where the diverter valve is open and when it is closed. Even if you have had the car tuned it is really hard to tune out this type of issue.

I used to have a Procharger and can help you out just hit me up in a PM.
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Old 05-10-2008, 10:45 PM   #3
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iac.

unplug it, and set the idle with the screw on the tb. if that fixes it you solved the problem. you can run without it you will just loose the ability to pick up rpm in warm up and ac.
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Old 05-10-2008, 11:25 PM   #4
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I had the same issues with my procharged svt after tuning. we spent quite a few hours messing with it. we got it to idle most of the time.

What I did to get it to hold an idle

Ditched the BOSCH BOV - upgraded to TurboXS RFL and installed it between the blower and the intercooler (seemed to be the biggest problem with it venting at idle)

Purchased new IAC (didnt seem to help much)

The idle was tolerable but if I let off around 1500 it would bounce till I blipped the throttle.

Finally I un-hooked the IAC and set idle with the screw on the throttle body (like tls_bmx mentioned)

Another thing not alot of people mention.. if purchase a lightned flywheel you loose rotating mass and its harder for the motor to overcome the drag of the blower at idle. My svt seems happy right at 1000rpms without the IAC.
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Old 05-11-2008, 02:03 AM   #5
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I had a 1989 ford escort gt that I had put a garrett turbo on, custom fabricated and i was having the identical problem it would always stall out after coming off of high revs and also sometimes at a stoplight. just had a reall hard time idling. I found that the diverter valve was open at idle leaking manifold vacume, because of this ,the car could not get a proper reading at the mass airflow sensor causing it to idle to lean and stall.
to fix this problem what I had done was redirect the diverter valve open side to the low presure side intake hose (in between mass airflow sensor and turbo) this had fixed the problem and it then idled like a dream, since the lost vacume was now redirected at the low side it closed the gap so that all of the air going into the intake was being read now by the mass airflow sensor. I hope that helps you out a bit
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Old 05-11-2008, 08:18 AM   #6
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to answer some of the questions... i did get a different DV, got a VF engineering, i do have a light weight flywheel, the car has been tuned twice by McNews both on 8psi and 10psi. i have relocated the DV from the original spot to after the IC. i even tried to recirculate the exhausted air from the DV back to the intake thinking a closed loop would help, but it didn't. ill go ahead and try to set the idle with the IAC unplugged. i do remember ray saying he bent the TB arm a little bit because it wasn't closing all the way.

well i give it a shot n report the results later...thanks so far guys.
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Old 05-11-2008, 08:29 AM   #7
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Quote:
Originally Posted by itbparada View Post
I had the same issues with my procharged svt after tuning. we spent quite a few hours messing with it. we got it to idle most of the time.

What I did to get it to hold an idle

Ditched the BOSCH BOV - upgraded to TurboXS RFL and installed it between the blower and the intercooler (seemed to be the biggest problem with it venting at idle)

Purchased new IAC (didnt seem to help much)

The idle was tolerable but if I let off around 1500 it would bounce till I blipped the throttle.

Finally I un-hooked the IAC and set idle with the screw on the throttle body (like tls_bmx mentioned)

Another thing not alot of people mention.. if purchase a lightned flywheel you loose rotating mass and its harder for the motor to overcome the drag of the blower at idle. My svt seems happy right at 1000rpms without the IAC.
also isnt the PC system designed to run with a DV and not a BOV. i thought that it can cause damage to the compressor wheel because of the pressure being built up and not being used or released.
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Old 05-12-2008, 01:43 AM   #8
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Quote:
Originally Posted by ken6x6 View Post
also isnt the PC system designed to run with a DV and not a BOV. i thought that it can cause damage to the compressor wheel because of the pressure being built up and not being used or released.
you know, I had wondered that... but I have seen an aftermarket BOV on almost every procharger or vortec systems installed locally also on numerous cars.

I hear my BOV open every time I let off the gas.. even on slight revs... So I dont really think there is much of a surge to worry about (especially with the abec9 bearing that my unit was rebuilt with)
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Old 05-12-2008, 05:14 AM   #9
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humm... ill do some more research and look in to that a little more... if a BOV can fix it with no illnesses im all for it.
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Old 05-12-2008, 07:14 AM   #10
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If you will get me a copy of your tune I will try to help you out with that , I feel it can be tweeked with in the tune to help that issue

Ray is a top notch tuner but I have found some tricks over the years that may help

Tom
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