1994 Chevrolet S-10 Hard Shift and Idle

CHEVROLET S-10
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TORGANC
  • MEMBER
  • 4 POSTS
I have a 94 s 10 2.2L. It starts up fine and if I shift into drive right away it shifts smooth thru all gears. After a minute or so, the check engine light comes on, it races a little higher and shifts real hard. I have replaced:

EGR VALVE
TPS
TEMP SENSOR

I can't figure out why when the check engine light comes on it starts shfting hard.

HELP PLEASE!
Apr 10, 2007 at 12:23 PM
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BOOTDOG
  • ✓Experienced Mechanic
  • 665 POSTS
first thing i would do is get the codes scanned. also check the speed sensor, they can make the tranny act up.
Apr 10, 2007 at 1:01 PM
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TORGANC
  • MEMBER
  • 4 POSTS
thanks for the quick responses! Would the speed sensor affect the idle at all? This truck is driving me crazy.
Apr 10, 2007 at 1:06 PM
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BOOTDOG
  • ✓Experienced Mechanic
  • 665 POSTS
no mainly while driving. they're inexspensive and easy to replace. usually located on either the transmission or the differential housing. (get the vehicle scanned first)!!
Apr 10, 2007 at 1:16 PM

Suggested Repair

Scan the vehicle for trouble codes first. Then inspect the vehicle speed sensor, which can cause harsh shifting while driving and is usually located on the transmission or differential housing. It is inexpensive and typically does not affect idle.

Conversation Summary

The owner of a 1994 Chevrolet S-10 2.2L says it starts and shifts smoothly at first, then the check engine light comes on, idle rises, and shifts become hard. The EGR valve, TPS, and temperature sensor were already replaced. The expert advises scanning codes first and checking the speed sensor for the transmission behavior, noting it mainly affects driving rather than idle.

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