vr4 boost problem jerks under boost - 3000GT/Stealth International Message Center
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Old 01-29-2013, 12:28 PM   #1 (permalink)
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Default vr4 boost problem jerks under boost

Happens in third gear and up did vac reduction and egr thought it might helped happend when i did a fmic and i forgot to plug waste gates up did the same thing that jerk under boost mods are full exhaust intake sqv bov just put new plugs in they were gapped for .40 so i put the new ngk coppers at .30 and had boost mod done but went back to wastegate any help is apprieated thanks video is below

https://www.youtube.com/watch?v=2tfM...e_gdata_player
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Old 01-29-2013, 01:06 PM   #2 (permalink)
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Default Re: vr4 boost problem jerks under boost

At 4000rpms and up under full boost
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Old 01-29-2013, 04:42 PM   #3 (permalink)
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Default Re: vr4 boost problem jerks under boost

Also when in high gear and your low on rpm and you try to give it gas it will like bov will go on and off on and off and you can hear air like backing in and out of the tubes on the bov
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Old 01-29-2013, 05:28 PM   #4 (permalink)
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Default Re: vr4 boost problem jerks under boost

All these views and nobody knows come on ill take whatever help i can get
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Old 01-29-2013, 10:14 PM   #5 (permalink)
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Default Re: vr4 boost problem jerks under boost

Do you have an aftermarket boost gauge? If so what is it doing and how much boost are you running. Probably boost blowing out a ic pipe. Could be a bad bov as well. If you don't have a gauge or data logger all you can hope to get is educated guesses.
Not using sentences makes it hard to understand what you are trying to say and some may simply not bother figuring it out.
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Old 01-29-2013, 10:21 PM   #6 (permalink)
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Default Re: vr4 boost problem jerks under boost

I have it as waste gate now and no I will get a boost gauge tmr.and sorry about not using periods I was in a rush thanks for the responce
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Old 01-29-2013, 10:26 PM   #7 (permalink)
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Default Re: vr4 boost problem jerks under boost

spark blowout?

wastegates jacked up?

would like to know AFR at moment when it happens, that would give us an indication of state of tune and whatnot

do you have FMIC? in some cars FMIC can cause those symptoms
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Old 01-29-2013, 10:30 PM   #8 (permalink)
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Default Re: vr4 boost problem jerks under boost

Yeah I don't have a gauge I was trying to figure out if it was boost solenoid so I went to wastgate boost. Was trying to find out if it was spark blow out or fuel cut also has a popping when u let off throttle it pops and at idle it pops I can post a video.
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Old 01-29-2013, 10:31 PM   #9 (permalink)
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Default Re: vr4 boost problem jerks under boost

Did you watch the video?
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Old 01-29-2013, 10:34 PM   #10 (permalink)
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Default vr4 boost problem jerks under boost

When did it start? Has it been sitting around for a while?


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