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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 03-14-2008, 10:58 AM   #1
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Viggen nordic stg 3 misfireing

so i just put in a stg 3 nordic ecu and at WOT im feeling a misfire and poping from my exhaust. no check engine lights and it runs smoothly otherwise. my spark plugs are gapped at 1.0mm about which is what is recomended.

any idea please?
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Old 03-14-2008, 11:04 AM   #2
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If I were to just put a new ECU in and had any issues I think my first reaction would be to talk to the person who writes or distributes the software. They would probably have the most accurate info for you.

(call and talk to Nick Taliaferro)
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Old 03-14-2008, 11:05 AM   #3
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How old are the plugs?

Condition of the DI?
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Old 03-14-2008, 11:16 AM   #4
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i tried calling nick but hes not in

the plugs r a few months old

and the di seems fine i never had any issues with it
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Old 03-14-2008, 11:17 AM   #5
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A tune will bring out issues in parts.

I have 2 DIs that work fine on stock cars with stock boost, but misfire on my stage 4.
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Old 03-14-2008, 11:23 AM   #6
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really? then that could be a possibility...since im pretty sure this is the original di
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Old 03-14-2008, 01:36 PM   #7
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What plugs are you running and no matter what I would change them with a new tune (cheap insurance)-drop the gap some.
Have you had the DIC replaced under the recall?
How old is the maf, if over 50k I would replace.
What about vacuum lines and such? Any leaks will rear their ugly heads when you raise the boost.
From what I was told, it will take at least 200 miles before the car fully adapts to the new ecu-this is what Nick told me, but if it's miss-firing then something else is wrong.

Last edited by lms; 03-15-2008 at 05:57 AM.
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Old 03-14-2008, 01:42 PM   #8
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What plugs are you running and no matter what I would change them with a new tune (cheap insurance)-drop the gap some.
Have you had the DIC replaced under the recall?
How old is the maf, if over 50k I would replace.
What about vacuum lines and such? Any leaks will rear their ufly heads when you raise the boost.
From what I was told, it will take at least 200 miles before the car fully adapts to the new dic-this is what Nick told me, but if it's miss-firing then something else is wrong.
99's were not covered on the DI recall. I fought with Saab USA about it to no avail. It was retarded. No one could give me a good reason to justify it....it came down to money since there were so few 99's, it was easy to screw us over and not be heard.
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Old 03-14-2008, 03:01 PM   #9
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It is hard to support something I did not sell. You might contact me by email with the original purchasers Vin and name.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 03-14-2008, 03:02 PM   #10
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It is hard to support something I did not sell. You might contact me by email with the original purchasers Vin and name.
Hahaha...yeah, that would be an issue too!
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Old 03-14-2008, 03:16 PM   #11
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yea 99 di's were not covered.

i replaced the maf just last month.

im running NGKBCPR7EXI-11 gapped at about 0.9mm

and i replaced all my vacuum lines

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Old 03-14-2008, 03:59 PM   #12
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Where did the ecu come from?
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 03-14-2008, 04:00 PM   #13
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Oh also throw those plugs away get NGK BCPR7ES-11 gap 1.0mm
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 03-14-2008, 07:02 PM   #14
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Thanks nick i will try those plugs tomorrow morning.

Also the ecu came from Wigwam Saab of RI...they no longer support nordic though.
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Old 03-14-2008, 08:37 PM   #15
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Oh also throw those plugs away get NGK BCPR7ES-11 gap 1.0mm
On my stock Vig the agents here in South Africa fit NGK BCPR7ES-10. If i di an ecu tune do i need to change plugs? NGK BCPR7ES-11? Whats the difference?

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Old 03-14-2008, 09:41 PM   #16
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On my stock Vig the agents here in South Africa fit NGK BCPR7ES-10. If i di an ecu tune do i need to change plugs? NGK BCPR7ES-11? Whats the difference?
The 11 and 10 is the gap. The 7 is the temperature... If the 7 were a 6 it would be a hotter plug.
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Old 03-15-2008, 08:41 AM   #17
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ok so i put in the NGK BCPR7ES-11 gaped at 1.0mm and its still misfiring.

i dont have my other boost gauge installed so im going off the factory one...it seems to misfire once the boost hits the end of the yellow and red...so it seems it is misfiring once the boost is raised above stock boost.
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Old 03-15-2008, 09:29 AM   #18
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Your stock viggen should boost to the red line give or take. Do you have the original ecu. If so put it back in and see what happens. Worth a shot to see if it's the ecu or not??? Does the nordic stage 3 still require a 3.5 fpr, or was that just the stage 3+. If it does, did you install that?
What did the plugs look like when you pulled them?
Can't believe saab did not recall the 99 viggen DIC, what sense does that make? Were the 2000-2002 DIC's that much different compared to the 99's?
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Old 03-15-2008, 10:14 AM   #19
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so it turns out it was the di. i replaced it and it runs great.

thanks everyone for your help
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Old 03-16-2008, 08:50 PM   #20
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The 11 and 10 is the gap. The 7 is the temperature... If the 7 were a 6 it would be a hotter plug.
So can i run BCPR7ES-11 on the stock car?
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