Loss of power when transmission is shifted into gear?

TAZMANN

MEMBER
2002 JEEP LIBERTY
3.2L
191,000 MILES

Idles fine, no check engine light or codes. Shift transmission into gear and top speed is 30, no power. Removed cat same results all plugs are good. I'm am feeling like it is a valve issue.

Tuesday, September 20th, 2022 AT 3:53 PM

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,640 POSTS

Hi,

If there was an issue with a valve, it would likely set a misfire code.

Also, when you reach 30 MPH, are the engine RPMs in line with the speed? For example, at 30 MPH, are the RPMs around 2,000, or are they extremely high? Is the transmission shifting?

Have you checked fuel pressure?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let me know. Also, if you could record it and upload it so I can hear what it is doing, it may help.

Take care,

Joe

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Tuesday, September 20th, 2022 AT 9:08 PM

TAZMANN

MEMBER
3 POSTS

RPMs are not in line with speed transmission does shift but it hesitates (I would assume because of speed) have not checked fuel pressure. Would fuel pressure change that much from idol to in gear have to be what seems full RPMs when in park but no power in gear. The only code in computer is ABS speed sensor.

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Wednesday, September 21st, 2022 AT 3:14 AM

TAZMANN

MEMBER
3 POSTS

Also, when put in gear the motor is real sluggish does not have throttle like when in park.

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Wednesday, September 21st, 2022 AT 3:23 AM

JACOBANDNICKOLAS

MECHANIC
109,640 POSTS

Hi,

Fuel pressure can cause it because there is an extra load on the engine requiring more fuel. However, what code is stored for the ABS? If we are getting an incorrect speed reading, it may be causing the transmission to operate erratically.

Let me know.

Joe

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Wednesday, September 21st, 2022 AT 2:54 PM