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Old 06-05-2002, 08:07 AM   #1
TR
Scooby Newbie
 
Member#: 28
Join Date: Jun 1999
Location: now w/100% less turbo
Vehicle:
1997 M3 Sedan
Blue

Question Little help...

The car:
98 Impreza RS
Rallispec Stage II Turbo (Top mount intercooler, Tial wastegate, Greddy blowoff)
2.2 Legacy Turbo Shortblock
S-AFC, J&S, Halman MBC (set at 8.5 lbs), RC 370 Injectors, Supra Fuel Pump, PiperX intake, Hi-Flow Cat, 3" Catback exhaust, Magnecor Wires.
recent addons were the S-AFC, MBC (set @8.5 lbs.) & RC Injectors.
Lotsa gauges: Boost, EGT, Oil Pressure, A/F, Fuel Pressure

The Symptons:
After filling up with gas last week (93) the car started to run really rough. kinda like it was misfiring. idle went realy rough, in fact it would eventually stall even while idling, unless I reved it a bit.
when cruising it sputters a bit, then catches.

I changed the plugs and put in Bosch Platinum 4's, but it didnt have any affect.

could it be:
the fuel? (I'll test that)
plug wires?
injectors - perhaps one isnt firing well?
MAF?
some other sensor?

any ideas?
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Old 06-05-2002, 08:45 AM   #2
Fitz
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Join Date: May 2000
Chapter/Region: NESIC
Location: New Boston, NH
Vehicle:
'07 335xi, '07 ZX6R
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First things first.. hit it with a compression test to find out if the cylinders are damaged. If it is the gas, then the gas is REALLY bad. I always run 93 but have successfully run 87 once and the car idled and drove fine (emergency situation), I just kept it out of boost. Any chance you have a fouled o2 sensor?

Fitz
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Old 06-05-2002, 10:40 AM   #3
Delicious Tuning
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Join Date: Jul 2000
Location: San Diego, CA
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Get rid of those Bosch Platinum's, they have been know to casue problems in the Subaru for some reason. I had them in my Turbo for a very short time and all they did was cause more problems, pinging, run to rich even though with any other plug it ran stoich.

Other things, check your coil pack, the connections mainly. One or two of them might be really corroded. Clean ti off and that will fix some problems.

Do you alway run 93 or something else? You coudl be running way to rich with 93 if it was tuned well for 91.

Do you have problems above 3500 RPM's consitently, then that coudl be your MAF.

Do you have a parallel fuel line conversion?

Make sure the setting in the AFC are correct, that can really mess things up.
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Old 06-05-2002, 10:44 AM   #4
Darshu
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Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

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If you're having problems with idling, make sure you check your vacuum lines (esp. to the AIC valve). Just throwing it out there. And a ditto on the Bosch plugs. NGK Platinums are good.
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Old 06-05-2002, 01:52 PM   #5
HndaTch627
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Join Date: May 2001
Chapter/Region: MWSOC
Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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first get rid of those bosch +4's they are junk. Next i am willing to bet you got a bad tank of gas...for whatever reason i had a vehiucle that i was banging my head on for 2 weeks only to find out they had a tank full of ethanol causing the car to run super lean to the point where the ECU was en-richening 37% at idle.

jeremy
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Old 06-06-2002, 07:33 PM   #6
TR
Scooby Newbie
 
Member#: 28
Join Date: Jun 1999
Location: now w/100% less turbo
Vehicle:
1997 M3 Sedan
Blue

Question

thanks all for the advice...
It looks like it was the S-AFC. When I put the settings in it works much much better - still a bit of hesitation.
problem is, the S-AFC does not seem to hold its settings. When I turn the car off and on again (reboot?) the settings are gone.
any ideas?
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Old 06-07-2002, 03:18 AM   #7
HndaTch627
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Location: Carol Stream, IL
Vehicle:
'01 GC8 Dinged STM
'09 Concours 14 ABS Black

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sounds like your full time power is getting interupted...check to make sure it's fuse isn't blown or has a bad connection.

jeremy
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