03 trailblazer 4.2l rpms fluctuate between 1500 and 2000

Post Reply New Topic
mstr1073
Posts: 1
Joined: Mon Nov 26, 2018 1:01 pm

03 trailblazer 4.2l rpms fluctuate between 1500 and 2000

Unread post by mstr1073 » Mon Nov 26, 2018 1:12 pm

While driving at hwy speed ( 50-65 mph) with a constant throttle the rpms begin to jump from 1500 - 2000 if i am above 2000 rpm it runs fine. i had a code for crank shaft position sensor that the guy erased and it did not come back but problem remained I have since replaced the sensor and still have the issue. does anyone have an explanation or fix?


User avatar
carriedi
Posts: 2265
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: 03 trailblazer 4.2l rpms fluctuate between 1500 and 2000

Unread post by carriedi » Mon Nov 26, 2018 10:50 pm

you should drive your truck with a scanner on it while it is acting up. Look at the trans section. It could be the transmission is locking and unlocking the torque converter or it could be shifting in and out of overdrive.
Browse "SIMILAR TOPICS" At The Bottom Of This Page.

Post Reply New Topic
  • Similar Topics
    Replies
    Views
    Last post