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Old 06-07-2003, 08:22 PM   #1
SCOOBER
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Member#: 223
Join Date: Sep 1999
Location: Ohio
Vehicle:
1999 Impreza 2.5RS-T
Aspen White

Default RS-T Idle & Starting Q's

I have the following setup on my '99 2.5RS...
Wrx exhaust, turbo and I/C
WRX fuel pump and injectors (W/Vortech 4:1 RRFPR)
Stock RS regulator
GFB 50/50 (running 100% atmosphere for now-trying to find a stock bov elbow)

My car does not start until the 2-3rd try (depending on how long it has been parked). It will then idle very rough or just die until it has been driven for a few miles. After the drive/warm up period, it will idle fine then suddenly drop a little then go back to normal. Any idea what is causing this and how have you guys fixed the issue?

The other annoying thing now is the car is REALLY hard to make move from a stop. This is not an all the time thing, but what happens is it feel like there is no air in the system and it is choking. You can start off and the clutch is fully engaged...the car will barely move and then suddenly GLH when the manifold pressure goes above zero.

I got a check engine light the other day when I started the car, and it was for low MAF voltage, high MAP voltage, rear o2 heater and #2 misfire.
Last night I let the car idle after a movie...sort of a rough idle...and I threw a CEL. This one was a misfire for #2 and one for #3 (probably from the idle dropping to 300ish rpm)

Any thoughts or solutions?
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Old 06-08-2003, 01:14 AM   #2
Surb00
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Join Date: Oct 2002
Location: Colorado Springs, Colorado
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1999 2.5 RS-T
Rally Blue

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I think its prob just because of the injectors. I have the WRX injectors with a Walbro pump and a S-AFC and I also experience those things. Oddly, I was running the same injectors N/A for a bit and never had any problems like that. Im going to do some major maintenence soon so maybe even a fresh O2 sensor and MAF sensor will help.
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Old 06-08-2003, 01:46 AM   #3
SubaFastR
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Join Date: Apr 2001
Location: RS202
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Looks to me like you have done everything to add fuel for boost, but nothing to trim down the fuel for off boost. Your ecu has no idea you have bigger injectors. It is sending injector pulses that it thinks are appropriate, but are not due to their large size. Sounds like you need and SAFC.
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Old 06-08-2003, 05:33 AM   #4
scoobyimpreza
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Join Date: Oct 2001
Chapter/Region: SCIC
Vehicle:
1998 impreza L
brillant red

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i have a VERY SIMILAR problem
-ej20g
-MRT FMIC
-MRT intake (i think)
-BPM turbo back
-LINK em



anyways my car has a hard time starting up and has a wild idle to.


any help would be great thanks


it really gets annoying

Last edited by scoobyimpreza; 06-09-2003 at 04:00 AM.
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Old 06-08-2003, 02:41 PM   #5
OKRS25
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Join Date: May 2003
Chapter/Region: AKIC
Location: Oklahoma, Ex Alaskan RS-T'er
Vehicle:
2005 STi
WRB

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Your running WAY to rich, you need to dial back some of your fuel. As far as I know you shouldn't need a RRFPR on you car, but you do need some kind of engine management if you want to keep on running those injectors... Running to rich can be just as hard on your engine as running to lean sometimes...
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Old 06-09-2003, 02:16 AM   #6
Revision
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Join Date: Sep 1999
Chapter/Region: MWSOC
Location: Carol Stream, IL USA
Vehicle:
MY05 PSM GGA !STOCK
MY99 RS-RIP / MY95 MX-5

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I have to wonder what you are doing for timing. If you are running stock timing while on boost then you will see some mechanical issues in the future.

You have a MY99 with the hot film MAF. With the lack of any kind of engine management, I'm assuming it is still inline. Chances are that the MAF needs cleaning or is blown. Even more so if you are using an oiled filter upstream of the MAF.

Even running 12:1 the car should idle fine. As for getting the car to move.. The idle and off idle are controlled by a combination of the front O2 and the MAF.. If either of these go out the the car will hesitate and stall a lot.
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Old 06-11-2003, 11:36 PM   #7
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Aspen White

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IThe MAF is okay...the car will drive fine...and I have two and have used both with the same results. I was thinking about this yesterday and it feels like the car is using all the intercooler air at idle then it chokes....and when the I/C fills up it idles normally again. This is the same when starting from a dead stop...sometimes the car goes just like stock...other times, it will not rev....sort of strangles...then it will go fine. It will do this when you step on the pedal to rev it sometimes too. I am not sure if maybe there is not enough air coming into the I/C at idle, or if it is something else....but it is a real downer for the whole driving experience....especially on hills!!

I am confused.......arrgghh!
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Old 06-12-2003, 08:51 AM   #8
Revision
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Location: Carol Stream, IL USA
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MY05 PSM GGA !STOCK
MY99 RS-RIP / MY95 MX-5

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What readings do you get on the vac gauge on decel and at idle?
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Old 06-12-2003, 11:04 AM   #9
Avenger
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2000

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How is your fuel pressure? Does it build up enough pressure when starting up?
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Old 06-12-2003, 12:53 PM   #10
BOY
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Chapter/Region: MWSOC
Location: Ft Wayne, IN
Vehicle:
99 RS-T RIP
02 Forster-S

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Doug, you're running too rich especially on the colder plugs. I've said it before, either drop your old injectors back in there and bump your fuel pressure, get NGK 7's and gap em correctly, or get some engine management in there.
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Old 06-12-2003, 01:01 PM   #11
HOK
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1999 EJ22T222B&EVO
Are we racing yet?

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Look out for fouled O2 sensors hehehe... speaking of experience..
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Old 06-12-2003, 01:07 PM   #12
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Vehicle:
1999 Impreza 2.5RS-T
Aspen White

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Revision - The vac gauge shows about -20 when the car is at idle...and it climbs toward the positive side when you accelerate. The gauge will go to 0 when the car does the bogging thing off the line, then accelerate suddenly.

Bill - I am going to get the "7's" in the next day or so, then try that fix.

Avenger - Fuel pressure...no idea. I have not installed a fuel pressure gauge yet....that is also in the near future plans.

I am taking the car in tomorrow to have some bodywork redone from an accident in January, so it will probably be there for a week or so. I will update then and see where we stand.

Thanks for the input so far...I will try the plug thing and see what happens there.
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Old 06-12-2003, 01:11 PM   #13
BOY
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Vehicle:
99 RS-T RIP
02 Forster-S

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Doug, don't worry you will get things sorted out. You could just run a freakin T-60 on that thing with your fuel setup and probably be OK...
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