Shift problems

GARY PHILLIPS

MEMBER
1998 CHEVROLET S-10
4 CYL
2WD
AUTOMATIC
173,000 MILES

I have a 1998 chevy s10 2.2 auto. Whenever it senses a load such as climbing a grade or passing the tranny will attempt to downshift but seems to go between gears instead of into gear unless you let off the gas then it will shift. Then sometimes when you give it gas it jumps out of gear again. Any ideas? Occasionally this will happen anytime when its cold even when not against a load. It seems to only affect 2nd gear.

3 Replies

KHLOW2008

MECHANIC
41,815 POSTS

Is the Check Engine Lamp indicaiting and have you tried to retrieve for trouble codes?

Check 3-2 control solenoid for dirt, damaged seals or electrical connections.

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Thursday, December 23rd, 2010 AT 2:29 PM

GARY PHILLIPS

MEMBER
2 POSTS

No codes or check engine light

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Saturday, December 25th, 2010 AT 8:19 AM

KHLOW2008

MECHANIC
41,815 POSTS

Have the 3-2 solenoid tested.

COMPONENT TESTS
COMPONENT & WIRING HARNESS RESISTANCE CHECK

1. Install Jumper Harness (J-39775) to transmission 20-pin connector. Using an ohmmeter, measure resistance between specified terminals for each component. See Fig. 3. Compare resistance reading to known values. See TRANSMISSION COMPONENT RESISTANCE SPECIFICATIONS table.

2.
If resistance reading is okay, go to next step. If resistance reading is not okay, disconnect wiring harness at component and measure component resistance. Replace component if resistance is not as specified. If resistance is as specified, repair wiring harness between component and 20-pin connector.

3. Measure resistance between ground and each terminal at transmission 20-pin connector. See Fig. 3. Resistance should be more than 250 k/ohms for each solenoid and more than 10 megohms for fluid temperature sensor and vehicle speed sensor. Resistance for fluid temperature sensor will vary with temperature. If resistance is within specification, problem is intermittent. If resistance is low, disconnect wiring harness at component.

4. Measure resistance between component terminals and ground. If resistance is low, replace component. If resistance is high, inspect wiring harness for short to ground. Repair as necessary.

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