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Old 01-21-2013, 11:12 AM   #1 (permalink)
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Default help boost problem !!!!!

To start off have a 91 vr4 mods are
Fmic
Intake
Full exhaust
Boost mod
Egr delete
Hks bov

The problem is on full boost it will give one hard jerk like u hit a wall happens at say 4k rpmsi gapped my plugs down the 30 they were 40 and smelled gas and black this all happened when i put the fmic there bigger pipes then stock but had no problems on my other car
Things i think it is
Boost leak
Faulty fuel pump cause its also taking awhile for car to start
Boost solinoid faulty and spiking
Fuel filter clogged i did run it on e before and also sat lifted jacked up forawhile to do the fmic any help is aprrieated thanks
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Old 01-21-2013, 12:51 PM   #2 (permalink)
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Default Re: help boost problem !!!!!

Fuel cut! Get a hotwired walbro in there. Or at least hotwire your fuel pump.
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Old 01-21-2013, 12:58 PM   #3 (permalink)
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Default Re: help boost problem !!!!!

For sure? Can I just run a 255 walbro without having to buy bigger injecters and afc
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Old 01-21-2013, 01:01 PM   #4 (permalink)
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Default Re: help boost problem !!!!!

Did you check for boost leaks? Do you have a boost gauge?
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Old 01-21-2013, 02:52 PM   #5 (permalink)
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Default Re: help boost problem !!!!!

I did only leaks from manifold rail where all the vac lines connect pressure makes it all the way there
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Old 01-21-2013, 09:27 PM   #6 (permalink)
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Default Re: help boost problem !!!!!

How bad or big is the leak? It doesn't really work that way.
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Old 01-21-2013, 11:10 PM   #7 (permalink)
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Default Re: help boost problem !!!!!

Im not sure just leaks from the 3 nipples on the manifold from the hose i guess so much pressure forces it out there
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