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Old 07-15-2005, 12:08 AM   #1
Scooby Newbie
Member#: 83497
Join Date: Mar 2005
Location: Maryland
2002 WRX Wagon
World Rally Blue

Default surge in ej22t, Suggestions?

I have a 93 lgacy rs and every time the boost comes on the car shakes and surges, sometimes violently. both the engines power delivery and boost seem to jump around however the car is so jumpy many times the boost gauge cannot react fast enough to show much change. I have tried to fix it by:

replacing the bov with a turbosmart recirculating type.

substituting a manual boost controller for the stock electronic one(now stock again).

replaced hoses and checked endlessly for vacuum leaks.

I did find one very large vacuum leak (pre-turbo) but fixing this did virtually nothing. I also unplugged the battery to try to reset the ecu still nothing.

Has anyone heard of anything like this? does anyone have any suggestions?
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Old 07-15-2005, 09:28 AM   #2
Scooby Newbie
Member#: 66331
Join Date: Jul 2004
Location: Boulder, Colorado

Check your plugs, you should be able to tell if your running too rich on boost. My car was doing that a week ago but i have a completely diff setup on my legacy and i just needed to lean out the fuel a little bit.
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Old 07-15-2005, 11:36 AM   #3
Scooby Specialist
Member#: 42659
Join Date: Sep 2003
Chapter/Region: MAIC
Location: Williamsport PA/SilvrSprngs MD
92 Legacy turbo5mt
All go and no show...


Do you get a CEL when this happens? If so, pull the codes.

I had a problem kind of like that once and it was because I had a loose vacuum line to the MAP sensor. Under heavy boost it was coming loose at the sensor. Tie strapped it and never had it happen again.
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Old 07-16-2005, 10:40 PM   #4
Scooby Specialist
Member#: 14141
Join Date: Jan 2002
Location: [email protected] @ 5800 ft on 13T
2002 Impreza WRX


what turbo are you running. If your getting true compressor surge on the turbo, than you need to lower your boost settings or change the settings so the boost builds slower. Compressor surge means the turbo is building more boost than it can support at that engine rpm ( usually poorly matched turbo and engine combination ).

If it is not due to compressor surge you could be having fuel or ignition issues.

It would help with a bit more info about your setup (how close to stock are you), and the circumstances where you see the surging. If your getting any CEL you need to get that code pulled and come back to the forum with that info.

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Old 07-19-2005, 03:43 PM   #5
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Member#: 67229
Join Date: Jul 2004
Location: SLC
9295 BC/gm6
winestone/funky blue


sounds like hesitation to me. sruge is more of a noise than it is a violent jerck and it doesnt happen when you get on it. do a tune up, replace your plugs and wires, be sure not to use auto lite. use ngk and what ever your local autozone shucks kragen checker has for wires. borg warner works pretty good.
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Old 07-19-2005, 09:21 PM   #6
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Member#: 89385
Join Date: Jun 2005
Location: Loading...
many most all


Too much boost, not enough fuel? Fuel filter, fuel sock?
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Old 08-18-2005, 05:03 PM   #7
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Member#: 93913
Join Date: Aug 2005
Location: South Fla 8-)
1996 Maxima
Super Black


Fuel pump??
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