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Car jerking?

Tiny
DHWANIL123
  • MEMBER
  • 2005 NISSAN PULSAR
  • 1.8L
  • 4 CYL
  • AUTOMATIC
  • 178,000 MILES
The car is jerking when I am at a signal at drive, converting to neutral subsides or lessens the jerk, it also jerks at reverse, but when I start my car on a new day, which does not happen, it starts to happen after a few kms or when the engine is at its running temperature.
Sometimes it also gives late transmission, due to jerks.
My mechanic checked the coil packs by opening them one by one, but he said it was not the problem and then the check engine light went on after he checked.
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Saturday, September 3rd, 2022 AT 5:20 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

If the check engine light is on, you need to scan the computer to retrieve diagnostic trouble codes. Here is a quick video showing how it's done:

https://youtu.be/b2IJGfImVvw

If you don't have a scanner, most parts stores will do it for you free of charge.

Next, often an engine vacuum leak can cause idle issues. Have you checked if there are any? If not, follow this link and let me know if you find a leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Also, let me know if there are any odd odors from the exhaust or strange sounds. Also, I need to know if the vehicle runs properly off idle.

Take care,

Joe
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Saturday, September 3rd, 2022 AT 11:28 PM
Tiny
DHWANIL123
  • MEMBER
  • 21 POSTS
Hello, I checked the code with an auto parts store, it says air filter sensor.
Does that cause the car to be jerky? And I also noticed that when A/C is on the jerking is more than usual.
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Monday, September 26th, 2022 AT 6:05 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I never heard of an air filter sensor. Is it possible they were referring to the mass air flow sensor? It is located in the air induction tube between the air filter box and the throttle body.

If it is the MAF, yes, that will cause drivability issues and could cause what you experience.

Confirm for me that this is a 2005 Nissan Pulsar. If it is, are you located in the US?

Let me know.

Joe
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Monday, September 26th, 2022 AT 7:46 PM
Tiny
DHWANIL123
  • MEMBER
  • 21 POSTS
Yes, the MAF, when I asked the wreckers for parts, I am in Australia though.
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Wednesday, September 28th, 2022 AT 12:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

That is what I was thinking you meant. Were you lucky enough to find one? Also, has anyone tried to service the one you have? They can be serviced. However, make sure you get cleaner specifically designed for a MAF sensor.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/mass-air-flow-service

Let me know if that helps.

Take care,

Joe
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Wednesday, September 28th, 2022 AT 5:02 PM
Tiny
DHWANIL123
  • MEMBER
  • 21 POSTS
I can find one, but I am not sure if that's the only problem.
Also, I am driving in o/d off, when o/d is on gear changing is problematic.
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Friday, October 14th, 2022 AT 11:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

Okay, that sounds transmission-related then. It could have to do with transmission line pressure, a torque converter, or the torque converter clutch.

Originally, I suggest scanning the computer. Rather than a traditional scan, you should likely scan the can-bus.

CAN stands for controller area network. Basically, the different modules/computers are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing them. Here is a link that explains how it's done.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Let me know if that is something you can have done.

Take care,

Joe
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Saturday, October 15th, 2022 AT 9:27 PM
Tiny
DHWANIL123
  • MEMBER
  • 21 POSTS
So does all mechanic does that?
And does it show that without the check engine light on?
When the check engine light was on, it showed MAF
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Monday, October 17th, 2022 AT 5:10 AM
Tiny
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  • MECHANIC
  • 109,885 POSTS
Hi,

As far as the can-bus scan, I can't say if all do it. If you go to a reputable shop, they should have a scan tool that can perform it. Have you contacted anyone yet?

Let me know.

Joe
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Monday, October 17th, 2022 AT 5:34 PM
Tiny
DHWANIL123
  • MEMBER
  • 21 POSTS
I haven't contacted anyone, does supercheap auto do that?
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Monday, October 17th, 2022 AT 6:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I am not familiar with them. Actually, I'm not sure where you are located. I would recommend contacting them.

Joe
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Monday, October 17th, 2022 AT 6:08 PM

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