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Old 08-19-2009, 10:23 PM   #1
mynameizstitch
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Default car kind of feels like it's jerking on highway driving

ok got a b16a3 with itr cams, dc header, aem cai just tuned on crome with a p28 ecu. when i drive on the freeway sometimes i feel like the car is jerking a little. it's not a lot at all but it's enough to just notice it. with my stock ecu everything runs fine and smooth. after the tune is when it now sometimes feels a lil wierd (hard to explain) but all i know is that it feels kind of like a "jerk" on the car when accelerating at a steady speed. i will check my spark plugs soon to see if they are fouled out since it seems like the car is running a lil rich after the tune.

***car is not throwing any engine check light codes and stuff like that. to me it seems like the car is running a lil rich.

Last edited by mynameizstitch; 08-19-2009 at 10:30 PM.
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Old 08-19-2009, 11:37 PM   #2
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Default Re: car kind of feels like it's jerking on highway driving

Tire may need air/too much air. Alignment. Wheel balanced. Camber. I dont think the motor or tune has to do with anything with your car jerking. But i could be wrong lol
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Old 08-20-2009, 01:48 AM   #3
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Default Re: car kind of feels like it's jerking on highway driving

alot of the times its the simplest thing. check your throttle cable/cable bracket to see if its stuck. :p
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Old 08-20-2009, 01:58 AM   #4
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Default Re: car kind of feels like it's jerking on highway driving

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Originally Posted by Sleeperzzz95 View Post
Tire may need air/too much air. Alignment. Wheel balanced. Camber. I dont think the motor or tune has to do with anything with your car jerking. But i could be wrong lol

i *think* he means the engine is not pulling smoothly, not that the car jerking from one side to another (such as needing an alignment.) then again, i could be wrong.
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Old 08-20-2009, 05:50 AM   #5
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Default Re: car kind of feels like it's jerking on highway driving

Im taking it as suspension issue. SHake your front end down.. If you know what I mean. You could need a wheel bearing.. inner and or outer tir rod. It could be a bumber of things. But im not taking it as a motor issue.
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Old 08-20-2009, 06:18 AM   #6
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Default Re: car kind of feels like it's jerking on highway driving

A bad TPS will cause the car to jerk a little bit on constant throttle...I'm having this issue right now with my Y7.
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Old 08-20-2009, 07:30 AM   #7
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Default Re: car kind of feels like it's jerking on highway driving

Quote:
Originally Posted by Sleeperzzz95 View Post
Tire may need air/too much air. Alignment. Wheel balanced. Camber. I dont think the motor or tune has to do with anything with your car jerking. But i could be wrong lol
car just got an alignment 3 months ago. i will check my tire pressure.
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Old 08-20-2009, 08:36 AM   #8
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Default Re: car kind of feels like it's jerking on highway driving

get a wideband & verify AFRs
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No tune. Turbo was was installed about three weeks ago. It ran fine up until Mon.
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Old 08-20-2009, 08:44 AM   #9
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Default Re: car kind of feels like it's jerking on highway driving

Hmmm after i reread your post..Now it sounds Like the Car is hesitant. Buckin so to speak. What gas is your car tuned on an what gas do you have in car? Bad gas mixure?
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Old 08-20-2009, 04:14 PM   #10
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Default Re: car kind of feels like it's jerking on highway driving

always using 91 octane gas and im pretty sure it was tuned on that since cali dont have anything higher.
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Old 08-20-2009, 04:15 PM   #11
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Default Re: car kind of feels like it's jerking on highway driving

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Originally Posted by Gunmetal_B20_Hatch View Post
get a wideband & verify AFRs
here is my graph of the dyno tune bottom parts read air fuel which i dont know howt o read it haha

Click the image to open in full size.
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Old 08-20-2009, 05:28 PM   #12
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Default Re: car kind of feels like it's jerking on highway driving

would need to know AFRs @ cruising speed.
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No tune. Turbo was was installed about three weeks ago. It ran fine up until Mon.
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Old 08-20-2009, 06:13 PM   #13
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Default Re: car kind of feels like it's jerking on highway driving

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Originally Posted by andoxviii View Post
A bad TPS will cause the car to jerk a little bit on constant throttle...I'm having this issue right now with my Y7.
Im also having the same problem..
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Old 08-20-2009, 08:23 PM   #14
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Default Re: car kind of feels like it's jerking on highway driving

I'm also having this problem, it seems like the engine is jerking a tiny bit just enough to notice. How would I go about testing the TPS?
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Old 08-23-2009, 04:29 AM   #15
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Default Re: car kind of feels like it's jerking on highway driving

so you're saying it's the engine not pulling smoothly and not a suspension or alignment issue? there still seems to be some confusion.

i had a problem with my tps on my gsr swap a couple times and i didn't even need to replace it, it just needed to be cleaned.
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Old 08-27-2009, 06:16 PM   #16
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Default Re: car kind of feels like it's jerking on highway driving

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Originally Posted by 92slowcivic View Post
so you're saying it's the engine not pulling smoothly and not a suspension or alignment issue? there still seems to be some confusion.

i had a problem with my tps on my gsr swap a couple times and i didn't even need to replace it, it just needed to be cleaned.
How do you clean it where do you spray and what do you use to clean it with?
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