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Saab NG900 & OG9-3 Performance, Mods & Tuning Covers Tuning & Performance modifications for the Saab NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible

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  #1  
Old 10th August 2012
Saabonthis Saabonthis is offline
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Default Stage 5 on OEM plugs?

Just picked up a 99 saab 93 with a JZW stage 5 tune. Has the jakstoll t25/t28 turbo, bigger intercooler, green giants, 3in dp and exhaust. Only issue I seem to be having is after 100+ miles it starts to misfire under full boost (27psi). It goes away when I replace the plugs. I'm wondering, maybe I should switch to a colder or hotter plug? And recommendations?
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  #2  
Old 10th August 2012
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Fox Fader Fox Fader is offline
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My first question would be about the tune or maybe ask JW.

You running an A/F gauge?
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  #3  
Old 10th August 2012
Saabonthis Saabonthis is offline
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No a/f gauge yet. That will be one of my first items to get. However, after checking the plugs they are a light tan color.
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  #4  
Old 10th August 2012
saabkid37 saabkid37 is offline
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what plugs are you using.
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  #5  
Old 10th August 2012
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^this
AND
what are the plugs gaped to?
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  #6  
Old 11th August 2012
Saabonthis Saabonthis is offline
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Well I just installed ngk iridium ix plugs. They are gapped at .040. New plugs didn't help the misfire/sputter. Drives just fine otherwise, just when you hit 15psi+ it starts to act up. The plugs before were some cheap bosch ones, it ran perfect for awhile. Gap was the same on those as well.
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  #7  
Old 11th August 2012
saabkid37 saabkid37 is offline
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It's very possible the non ngk plugs blew up the di cassette.
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  #8  
Old 11th August 2012
Saabonthis Saabonthis is offline
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Anyway I can test the di?
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  #9  
Old 11th August 2012
tomipee tomipee is offline
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You should try with another dic
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  #10  
Old 11th August 2012
losacker losacker is offline
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i would go with the original resistor plugs instead of the iridiums. and the gap should be .039, not .040. especially with higher boost you might be blowing out the spark with the longer gap.
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  #11  
Old 11th August 2012
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at stage 5 gap them tighter than that... closer to .033-.034
Im gaped at .030 on my stage 6
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  #12  
Old 11th August 2012
Saabonthis Saabonthis is offline
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I'll lower the gap down a bit and see if that helps at all. Also I do not have a rear o2 sensor. I have replaced the front with a universal bosch. However, I'm getting that p0135 code. I've checked fuse 38, and it's good.
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  #13  
Old 11th August 2012
swedishrocketng900se swedishrocketng900se is offline
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Are u running a red or black dic ? ive heard that for the higher level tunes that t5 should run on the red dic just a thought idk how true it is though
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  #14  
Old 11th August 2012
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I'm using the red top di
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  #15  
Old 11th August 2012
AZR Racing AZR Racing is offline
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t5 should run the red DIC regardless. you can run the black DIC on a t5 but its not reccomended due to the lack of some components, like a knock sensor. stage 5 tune and no wideband... this is a recipe for disaster. you could be leaning out really bad. does this car have a 3bar map sensor? what color are the plugs when you pull them out.
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  #16  
Old 12th August 2012
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I run NGK's 7's on my stage 5, Gapped to 0.9mm.

Use the cheap NGK BCPR7ES-11 copper plugs, Our motors love them.
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  #17  
Old 12th August 2012
tomipee tomipee is offline
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^i use those too, no problem. Many uses those ngks here in finland, good plug for these engines. Doesnt last for years i think, but those are cheap
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  #18  
Old 12th August 2012
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Okay, well after checking the plugs, they are a light tan color. Also I turned the psi down to 20psi and put the plug gap at .030 and so far it's not misfiring.
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  #19  
Old 12th August 2012
saabkid37 saabkid37 is offline
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Quote:
Originally Posted by Saabonthis View Post
Okay, well after checking the plugs, they are a light tan color. Also I turned the psi down to 20psi and put the plug gap at .030 and so far it's not misfiring.
time out. if you turned down the boost it sounds like your using an mbc with an ecu tune...which is a no no.
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  #20  
Old 13th August 2012
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Quote:
Originally Posted by tomipee View Post
^i use those too, no problem. Many uses those ngks here in finland, good plug for these engines. Doesnt last for years i think, but those are cheap
I change my plugs every second oil change and re-gap every oil change.

Quote:
Originally Posted by Saabonthis View Post
Okay, well after checking the plugs, they are a light tan color. Also I turned the psi down to 20psi and put the plug gap at .030 and so far it's not misfiring.
Yeah, How did you turn your boost down?
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