Low RPM bucking (misfire) no DTC
When I am cruising at less than 2000 RPM the car shudders and bucks like its misfiring, but no code I dont have any way of monitoring for knock or anything. Anybody with similar problems or any suggestions. Help please!!!
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you are porbably knocking
are u driving slow in a high gear? |
approximately 1500-1900 rpm 40-50 mph flat ground very little load on engine 6-10lbs vac.
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Originally Posted by PimpLay2
(Post 2920609)
you are porbably knocking
are u driving slow in a high gear? There are a number of different things that can cause this...so lets get some more information. When you get this bucking or shuddering...is the clutch fully engaged?
Originally Posted by Terminator2
(Post 2920766)
approximately 1500-1900 rpm 40-50 mph flat ground very little load on engine 6-10lbs vac.
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Are you keeping the same amount of pressure on the accelerator the whole time? Or are you lifting your foot off a lil bit?
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Yes, I am In 5th gear constant light pressure on the throttle. If I press it down a little further its ok, which is weird. Is it telling the injectors to cut fuel like when you let off and coast?
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ya mine does that a bit if i floor it at too low of an rpm... thought it was kinda odd
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I heard on the sky forums if you regap the factory plugs to 0.025 it may help with low rpm misfire. Any thoughts or people who have done this?
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Is it a bucking or just a vibration?
I get vibration when under light throttle in 5th under 2k rpms, but thats not unusually IMO. |
Are you resting your foot on the clutch (not pushing it in...just not taking it off all of the way)? I have a bad habit of doing this and sometimes I get this bucking...probably engaging the clutch slightly...
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Originally Posted by TrevMo
(Post 2921679)
Are you resting your foot on the clutch (not pushing it in...just not taking it off all of the way)? I have a bad habit of doing this and sometimes I get this bucking...probably engaging the clutch slightly...
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Mine only does anything even remotely close to that if I let my foot off the gas a little bit.
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I think this may have more to do with hitting a resonance frequency between the drivetrain/chassis then an actual engine misfire issue.
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mine does it if the car has not been running for a while and i switch from 1st to 2nd around 3k RPMS
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I think It's just the nature of the DI, mine a little bit of a miss feel @ low RPM's in 5th, uinder light throttle. Reminds me exatly how a rig does if you start moving it in to high of a gear.
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Originally Posted by Terminator2
(Post 2921633)
I heard on the sky forums if you regap the factory plugs to 0.025 it may help with low rpm misfire. Any thoughts or people who have done this?
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Originally Posted by krispy
(Post 2921670)
Is it a bucking or just a vibration?
I get vibration when under light throttle in 5th under 2k rpms, but thats not unusually IMO. |
lol all engines do this with high torque learn to drive it better and you will not get the buck. It is because of lack of experience with the Clutch. No Big Deal. It is normal. Try driving a mazda b4000 manual truck. Thing bucks like you can't believe.. 5th gear is meant for 55+ lol going 45 in 5th should make it buck at low RPMS slowing down, I would be pissed too if I had to go from 10 mph to 55+ starting in 5th ofcourse the tranny is gunna want higher RPMs it's not your moms Subaru ... Watch a semi truck take off with no load sometime.
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Originally Posted by BowTieTillIdie
(Post 2923693)
lol all engines do this with high torque learn to drive it better and you will not get the buck. It is because of lack of experience with the Clutch. No Big Deal. It is normal. Try driving a mazda b4000 manual truck. Thing bucks like you can't believe.. 5th gear is meant for 55+ lol going 45 in 5th should make it buck at low RPMS slowing down, I would be pissed too if I had to go from 10 mph to 55+ starting in 5th ofcourse the tranny is gunna want higher RPMs it's not your moms Subaru ... Watch a semi truck take off with no load sometime.
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Is it just a little drive train lash? There will always be a bit of gear lash in a manual transmission, that plus stock motor mounts can cause this.
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Originally Posted by rukkee
(Post 2927974)
Is it just a little drive train lash? There will always be a bit of gear lash in a manual transmission, that plus stock motor mounts can cause this.
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mine does that too
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Originally Posted by Terminator2
(Post 2924853)
I have driven many much more powerful stick shift cars. A 2004 Viper Srt 10 (dads), 2005 ls2 GTO (last car). 1987 911 Turbo. Modified 1999 Mustang Gt. I know how to drive powerful cars. My 2008 2.3L ranger can hold 5th at 35-40mph no bucking at all. My mustang would hold 5th at 30 mph no bucking at all. I am not ragging on it in 5th or letting off and pressing the accelerator as I drive either.
Naturally aspirated V6, V8 engines will behave differently than turbo charged 4 cylinder engines. |
Originally Posted by Terminator2
(Post 2924853)
I have driven many much more powerful stick shift cars. A 2004 Viper Srt 10 (dads), 2005 ls2 GTO (last car). 1987 911 Turbo. Modified 1999 Mustang Gt. I know how to drive powerful cars. My 2008 2.3L ranger can hold 5th at 35-40mph no bucking at all. My mustang would hold 5th at 30 mph no bucking at all. I am not ragging on it in 5th or letting off and pressing the accelerator as I drive either.
LOL |
I've noticed on my car that when cold and in 1st and 2nd gear at low speeds right after start up there's a little bit of driveline lash and bucking that is more noticeable with the A/C. I think that's normal though and is more than likely the engine calibration altering the timing and fueling to get the cat to light off faster. But if enough people take their car in for service then a manufacturer may sometimes try to release a flash/programming update but I haven't heard of anything so far for the new SS.
You can have light audible knock that won't damage an engine but it's hard to say it that's the case here. If you suspect knock or a misfire you could always try to monitor on a scan tool. I'd bet there probably isn't a problem with the car but you could always check the simple stuff like plugs and make sure there aren't any vacuum line or sensor issues. Also while the LNF pulls pretty well from low rpms and is very smooth, 1500 rpms is a little too low for 5th even though it will still pull the car on flat ground. It might just be a case of needing to modify your driving style, especially if you were used to higher displacement engines in the past that can inherently pull better at low rpms than a small displacement boosted engine. |
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