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2000 Chevrolet Blazer Repair Question


Topics covered: Engine, Rpm, Sensor.
Mileage: 160,000 miles.

Asked on December 11, 2011

I have a chevy and when i get to around 60-75 mph the rpms start to jump 200 rpm. could this be a transmission problem?

Happens at 60-75 mph
Avatar Asked by Caleberickson

Answer

Replied on December 11, 2011

Most likely not. If the check engine light has come on, have the computer scanned for trouble codes. A bad trans will slip at any speed. My guess is there may be a bad throttle position sensor or something like that.

Tiny Answered by Jacobandnickolas (expert)
57,472 answers provided
Replied on December 11, 2011

I have p1870 transmission component slipping code showing. Doesn't slip bad though. I was reading up and some were saying possibly torque converter acting up locking and unlocking. I was also thinking of a throttle position sensor going out

Tiny Response from Caleberickson
4 questions asked
Replied on December 11, 2011

200 RPM's would be hard to notice if it wasn't slipping. WHen the RPM's increase, do you feel the vehicle accellerate at all?

Tiny Answered by Jacobandnickolas (expert)
57,472 answers provided

Replied on December 11, 2011

Yes when it jumps up and down it will***** a bit. Gets very frustrating driving on highway

Tiny Response from Caleberickson
4 questions asked
Replied on December 11, 2011

Pull forward and back

Tiny Response from Caleberickson
4 questions asked
Replied on December 11, 2011

That leads me to believe the trans isn't the problem. Try having the computer scanned for trouble codes. Most parts stores will do it for free. I think it may be engine related. Also, check to make sure the trans fluid isn't burnt, low, or really dirty.

Tiny Answered by Jacobandnickolas (expert)
57,472 answers provided

Replied on December 11, 2011

Only codes present when scanned was the p1870. Transmission component slipping.

Tiny Response from Caleberickson
4 questions asked
Replied on December 11, 2011

IS the trans fluid clean and full?

Tiny Answered by Jacobandnickolas (expert)
57,472 answers provided
Replied on December 11, 2011

I need to check the fluid. Possibly low. I also have a bad thermostat that im going to fix would that have anything to do with the lurching? Being that the engine is not getting to normal operating temp?

Tiny Response from Caleberickson
4 questions asked
Replied on December 11, 2011

No to the temp, but yes to the low ATF.

Tiny Answered by Jacobandnickolas (expert)
57,472 answers provided