Slow Pickup and transmission shifting?

ERVINW

MEMBER
2007 NISSAN BLUEBIRD
1.5L
4 CYL
2WD
AUTOMATIC
200,000 MILES

Seems to be not changing the gears quickly at about 50km and sometimes after braking, the pickup may be a bit slow. I have cleaned the throttle body and the Mass Air Flow Sensor. There are no check engine lights or codes.(Nissan Bluebird Sylphy 2007)

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

This can happen when the catalytic converter starts to clog up and lower engine vacuum making the engine computer think the car is going up a hill which holds the gears longer. This guide can help confirm the issue:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Also, we should run the codes to see if any are stored.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over these guides and get back to us.

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Thursday, May 16th, 2024 AT 12:16 PM

ERVINW

MEMBER
5 POSTS

Sorry about the tardy response, I will try these as soon as the weather permits and provide feedback. I only have weekends available.

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Monday, May 20th, 2024 AT 12:32 PM

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

No worries, let me know how things go.

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Monday, May 20th, 2024 AT 12:47 PM

ERVINW

MEMBER
5 POSTS

Good morning Ken, Finally got around to checking it, I disconnected the catalytic converter and washed it with soap water allowed it to drain before installing it. The problem has subsided. I will reset the throttle valve hopefully this weekend and allow it to relearn.
Thank you so much.

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Tuesday, October 22nd, 2024 AT 4:33 AM

KEN L