Part throttle miss-stutter-misfire @ 3000 rpm when under almost no load 3rd 4th gear
Nov 12, 2009, 02:18 PM
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Part throttle miss-stutter-misfire @ 3000 rpm when under almost no load 3rd 4th gear
This has thrown the misfire code and may happen daily or once every couple days or MANY times in one day!!!
Just cruising with traffic in either 3rd or 4th gear at 2800-3000 rpm the car will what seems to be shutting down a cylinder!?! (Sounds like a Subaru)
Leaning into the throttle will not clear it up. It will continue in subie mode... until I let off the gas...I can slowly or quickly get back on the gas and the problem is gone... 4 cyls as usual.
All this occurs UNDER 1/4 THROTTLE!!!!! NO WOT ISSUES AT ALL!!!!
It pulls clean and hard if you mat it.
I have changed plugs (.024 gap)
Swapped out coils and wires
Air intake ram horn is secure with two cilps
Nothing has been altered shortly before the problem surfaced!
Only mod on the car is an AMS TBE with cat. NOTHING ELSE. Not even a drop-in.
It's an '03 and has 64k mi. HAS OCCURED BEFORE PUTTING ON THE EXHAUST.
Only code thrown is the 0300 random misfire
Help. Please.
Just cruising with traffic in either 3rd or 4th gear at 2800-3000 rpm the car will what seems to be shutting down a cylinder!?! (Sounds like a Subaru)
Leaning into the throttle will not clear it up. It will continue in subie mode... until I let off the gas...I can slowly or quickly get back on the gas and the problem is gone... 4 cyls as usual.
All this occurs UNDER 1/4 THROTTLE!!!!! NO WOT ISSUES AT ALL!!!!
It pulls clean and hard if you mat it.
I have changed plugs (.024 gap)
Swapped out coils and wires
Air intake ram horn is secure with two cilps
Nothing has been altered shortly before the problem surfaced!
Only mod on the car is an AMS TBE with cat. NOTHING ELSE. Not even a drop-in.
It's an '03 and has 64k mi. HAS OCCURED BEFORE PUTTING ON THE EXHAUST.
Only code thrown is the 0300 random misfire
Help. Please.
Last edited by hoof hearted; Nov 12, 2009 at 02:22 PM.
Nov 12, 2009, 02:48 PM
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The 03-04 8 roms had this issue. The factory has a reflash, but when i got mine reflashed I still had an occasional 0300.
I had car retuned with fix by a pro tuner. Check ECUFlash forums for the fix, if you want to do it yourself.
I had car retuned with fix by a pro tuner. Check ECUFlash forums for the fix, if you want to do it yourself.
Nov 12, 2009, 03:38 PM
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Could you actually FEEL/HEAR the misfire when it happened?
Sounds like I'm jocking a WRX.... ewwww.
I'm afraid to do any more mods until I get this issue cleared up.
I plan on taking it to AMS for a dyno-tune after I have all my mods done... I'm gonna post this over on their thread...
THANKS for the info!
Nov 12, 2009, 03:58 PM
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Never changed filter yet.... My thinking is if it's all good WOT and everywhere else BUT 2800-3000 (consistent RPM range for the miss) I have some sort of electrical gremlin...
Jun 21, 2010, 03:12 PM
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I changed the cam sensor --- that wasn't it.
Next I'm going for the resistor box....
I'll keep posting.... If you find something LEMME KNOW!!!!! This sucks!
Thanks
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Jun 21, 2010, 06:18 PM
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Change from the 008 ROM to the 015 ROM and that will either reduce the occurrence or eliminate it. If it still occurs, upgrade to the Tephra mod.
Aug 2, 2010, 07:18 PM
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SOLUTION
Raise your knock thresholds by a few points. I am certain that the increase drive train noise caused by cams (and most mods) creates false knock. Even though we technically don't care about knock below 3000, the car does.
So. Raise the Low and Mid Knock Multipliers and watch the stutter go away.
Raise your knock thresholds by a few points. I am certain that the increase drive train noise caused by cams (and most mods) creates false knock. Even though we technically don't care about knock below 3000, the car does.
So. Raise the Low and Mid Knock Multipliers and watch the stutter go away.
Aug 3, 2010, 07:25 AM
#15