Misfire when shifting quick or power shifting
#1
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Misfire when shifting quick or power shifting
My SS has a K and N SRI, catless dp, and a trifecta tune. If I shift quick from 2nd to 3rd it almost always cuts out until I let out of it. The harder you shift the worse the misfire. Normal driving is fine. Only codes I've got is P0300 from it. Any ideas?
#2
Are u trying a no lift shift? U need to do it just right or ull get exactly what ur getting. U don't have to shift hard just fast and time it properly, u have milli seconds to complete it or it will not work. I'd advice u not to do that on tune unless u wanna buy a new tranny. If its on stock clutch it's safer, but still most guys won't recommend it. How exactly are u trying to do this shift? Explain
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A no lift **** is a power shift. Right foot on the floor, throw clutch in, shift, let clutch out without moving your right foot. I'm not physically shifting to the point I'm trying to break the shifter off. By harder I mean faster. I'm getting the car right around 5600-5700. I can feel when the car needs to be shifted. It does it whether I NLS or just shift quick letting off and back into it but its worse NLS shifting. It didn't always do this and I've had this happen after the car had been on the road for an hour. I remember coolant temps at 189 when it done it once. It used to spin through 2nd from a 40 roll and chirp going into 3rd, now I just get the stumble.
#5
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A no lift **** is a power shift. Right foot on the floor, throw clutch in, shift, let clutch out without moving your right foot. I'm not physically shifting to the point I'm trying to break the shifter off. By harder I mean faster. I'm getting the car right around 5600-5700. I can feel when the car needs to be shifted. It does it whether I NLS or just shift quick letting off and back into it but its worse NLS shifting. It didn't always do this and I've had this happen after the car had been on the road for an hour. I remember coolant temps at 189 when it done it once. It used to spin through 2nd from a 40 roll and chirp going into 3rd, now I just get the stumble.
#6
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Isn't PO300 random misfire? Might take a glace at your plugs just to make sure. Also I think for NLS to function correctly you have to be in competetive mode and shift at red line (could be wrong I just never try to NLS unless I'm in competetive mode)
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P0300 is a random misfire. I honestly couldn't tell you the exact rpm I've been shifting but I've used the same technique for 45k miles and I've just recently started experiencing a problem. I did change the plugs not long ago. Maybe the gap isn't exactly right. I bought a set that were suppose to be pre gapped for it once before and it wouldn't run at all in boost.
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Sounds like your clutch is starting to slip because of nlsing on the tune. Also shifting below 6000rpm doesn't help the clutch or nls at all.
When your clutch slips on nls it will throw missfire codes, and also stutter/stumble. It's happened to me when my clutch started slipping so I simply don't nls on tune.
Besides, a tuned stock turbo drops power at 5500rpm, by 6000rpm it's barely above gms1. You are better off not nlsing and shifting around the 5800-6000 mark.
When your clutch slips on nls it will throw missfire codes, and also stutter/stumble. It's happened to me when my clutch started slipping so I simply don't nls on tune.
Besides, a tuned stock turbo drops power at 5500rpm, by 6000rpm it's barely above gms1. You are better off not nlsing and shifting around the 5800-6000 mark.
#12
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It does it even if I don't NLS. Any quick shift into 3rd causes a misfire. Quick shifts just gives a slight bog/stumble though. Honestly my tune seems to fall off above 6k like the car pulls out of its power band. I can get more rpm out of the stock tune which I don't really understand. No misfires any other time car runs great. I'll check plugs and watch closer to exactly what I'm doing when it does it.
#16
ur shifting to early. shift at about 6k. don't listen to the get rid of trifecta talk, its a good tune. only people who have issues with it is the people who get an aggressive tune on stock turbo or other dumb crap. iv never had issues with mine, going on 4 years. and iv never had issues nlsing unless I didn't do it right.
#17
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I had this problem but I had bent valves. Replaced valves and problem went away. Valvetrain is garbage in these cars. springs are weak and lash adjusters are junk. I blew all these parts. Replaced all and boom! NLS perfect
#20
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Go buy a mustang.
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