Moderate Jerking
#1
Senior Member
Thread Starter
Moderate Jerking
Posted in General but no one must look at those threads
Ok I'm ripping my hair out over here. Here's a description of the problem...
Only happens when shifting from first to second gear under partial throttle, and when I shift between 2200RPM and 3300RPM
The "stutter" or "jerking" is similar to pressing the throttle and releasing it rapidly, it only stops if I release throttle then floor it and slowly release to desired throttle position.
I've replaced MAF Sensor, Map sensor, Throttle body, and still does it. Replacing throttle body solved the issue for about a day then it returned.
Is there anything I am missing, anything I should check. this is frustrating as hell
Thanks in advance for the help guys.
Ok I'm ripping my hair out over here. Here's a description of the problem...
Only happens when shifting from first to second gear under partial throttle, and when I shift between 2200RPM and 3300RPM
The "stutter" or "jerking" is similar to pressing the throttle and releasing it rapidly, it only stops if I release throttle then floor it and slowly release to desired throttle position.
I've replaced MAF Sensor, Map sensor, Throttle body, and still does it. Replacing throttle body solved the issue for about a day then it returned.
Is there anything I am missing, anything I should check. this is frustrating as hell
Thanks in advance for the help guys.
#7
Senior Member
Thread Starter
Like I said its only going into second and its violent as if you were flooring the pedal and releasing it constantly
#8
Senior Member
iTrader: (1)
Mine has been doing it since day one, no amount of tuning or engine rebuilding has ever changed anything, and yes it is more prominent when it is cold. I don't even have an LSJ. lol I'f i dont let the car warm up and pull away from it being dead cold, it will jerk back and fourth exactly like that, like the throttle is being pressed and let off and pressed and let off. I've also had numerous issues on both cobalt's we have here with them being just dead on power when you try to pull away with the engine cold, it either wont respond to the gas pedal and struggle to get moving or will pull away real fast and then drop power instantly. Again, all goes away immediately once it gets above i wanna say 100 degrees on ECt and the engine starts getting warm.
#9
Senior Member
Thread Starter
That seems a lot like what mine is doing except mine will do it while warm too. I've got a remote start on mine so it's usually been running for 10min or so before I drive off in it, coolant temps are usually around 150-170 and it will still do it. So you have not found a cause for this... That worries me
#12
Senior Member
Thread Starter
^^Yes it will do it up to about 4k to and it's only under partial throttle, I've sent trifecta a few datalogs and they never said anything about it. Do you think the pedal itself might be going, but that would not explain why its only partial throttle and in second gear
Last edited by Mendomar06; 01-21-2015 at 06:23 PM.
#13
Senior Member
Thread Starter
Well here's a list of the mods idk if it might help;
LSJ
ZZP Longtube headers and 3" catted DP
Ported M62 on 2.6" Pulley
Option B, Dual Pass, Secondary HE
80s
LNF 3.82 Trans w/LSD
Trifecta tune
It was doing the same thing with the TVS on it, i thought it was the SC so i put the M62 back on but that didnt fix anything.
LSJ
ZZP Longtube headers and 3" catted DP
Ported M62 on 2.6" Pulley
Option B, Dual Pass, Secondary HE
80s
LNF 3.82 Trans w/LSD
Trifecta tune
It was doing the same thing with the TVS on it, i thought it was the SC so i put the M62 back on but that didnt fix anything.
#14
Junior Member
I had the exact same issue with my old LSJ, But unfortunately I never got to figure it out.
But I did change my plugs and coils and was about to do injectors, Was suggested it might be my fuel filter or to look at my tune. These are a couple things to think about I didn't do much planning after that to be honest since I never even got to install my injectors.
Hope this helps, Keep us posted.
But I did change my plugs and coils and was about to do injectors, Was suggested it might be my fuel filter or to look at my tune. These are a couple things to think about I didn't do much planning after that to be honest since I never even got to install my injectors.
Hope this helps, Keep us posted.
#15
Senior Member
Thread Starter
plugs are new just changed about 500 miles ago. Im gonna do the timing chain and check the valves as suggested. I'm hoping one of those things will fix it.
#16
Senior Member
iTrader: (5)
mine does the jerking bull and i drive in alot of traffic so u can imagine its very annoying
to me the car reacts like its about to stall and its bucking itself around. rpms are always above 1k and it does it around 2000-2500 just guessing i dont pay attention to it much any more
to stop it i push the clutch in and try to hold a constant speed at a different rpm.
mainly does it in 1st and 2nd. but has bucked in other grinds not as bad tho
replaced tb, upstream o2 sensor, spark plugs, cleaned air filter and washed the car jk haha
to me the car reacts like its about to stall and its bucking itself around. rpms are always above 1k and it does it around 2000-2500 just guessing i dont pay attention to it much any more
to stop it i push the clutch in and try to hold a constant speed at a different rpm.
mainly does it in 1st and 2nd. but has bucked in other grinds not as bad tho
replaced tb, upstream o2 sensor, spark plugs, cleaned air filter and washed the car jk haha
#17
Senior Member
iTrader: (6)
mine does the jerking bull and i drive in alot of traffic so u can imagine its very annoying
to me the car reacts like its about to stall and its bucking itself around. rpms are always above 1k and it does it around 2000-2500 just guessing i dont pay attention to it much any more
to stop it i push the clutch in and try to hold a constant speed at a different rpm.
mainly does it in 1st and 2nd. but has bucked in other grinds not as bad tho
replaced tb, upstream o2 sensor, spark plugs, cleaned air filter and washed the car jk haha
to me the car reacts like its about to stall and its bucking itself around. rpms are always above 1k and it does it around 2000-2500 just guessing i dont pay attention to it much any more
to stop it i push the clutch in and try to hold a constant speed at a different rpm.
mainly does it in 1st and 2nd. but has bucked in other grinds not as bad tho
replaced tb, upstream o2 sensor, spark plugs, cleaned air filter and washed the car jk haha
#18
Senior Member
Thread Starter
I have a Wideband and an interceptor, Ive tried watching both when it does it but its too distracting to try to watch the guages and pay attention to the road. I guess i could put my gopro on record and watch the video later and see what it is doing.
#19
Senior Member
Thread Starter
mine does the jerking bull and i drive in alot of traffic so u can imagine its very annoying
to me the car reacts like its about to stall and its bucking itself around. rpms are always above 1k and it does it around 2000-2500 just guessing i dont pay attention to it much any more
to stop it i push the clutch in and try to hold a constant speed at a different rpm.
mainly does it in 1st and 2nd. but has bucked in other grinds not as bad tho
replaced tb, upstream o2 sensor, spark plugs, cleaned air filter and washed the car jk haha
to me the car reacts like its about to stall and its bucking itself around. rpms are always above 1k and it does it around 2000-2500 just guessing i dont pay attention to it much any more
to stop it i push the clutch in and try to hold a constant speed at a different rpm.
mainly does it in 1st and 2nd. but has bucked in other grinds not as bad tho
replaced tb, upstream o2 sensor, spark plugs, cleaned air filter and washed the car jk haha
#22
Senior Member
Thread Starter
No rough idle on mine, problem is under partial throttle.
Last edited by Mendomar06; 01-22-2015 at 01:16 AM. Reason: Automerged Doublepost
#25
Senior Member
iTrader: (5)
my car broke on Friday haha p0335 but it drives fine now
i did a 2nd to 3rd pull and it died, let it cool down and drove off into the sunset. Im gonna get the sensor replaced as this will be the 2nd time. 1st time it was actually the battery dying
code is crankshaft position sensor
i did a 2nd to 3rd pull and it died, let it cool down and drove off into the sunset. Im gonna get the sensor replaced as this will be the 2nd time. 1st time it was actually the battery dying
code is crankshaft position sensor