1993 GMC Sierra not shifting

Tiny
SAGE455
  • MEMBER
  • 1993 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 88,000 MILES
When I start out from a dead stop it feels like the trans is stuck in 3rd gear. When I start with shifter in 1st gear it feels like its starting in 2nd gear. When driving. It won't shift into overdrive. The fluid is nice and red and has no burn smell. When started up cold it will shift normal for a very short time. I checked all eletrical connections and vacuum lines.
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Sunday, March 15th, 2009 AT 1:13 PM

4 Replies

Tiny
IMPALASS
  • EXPERT
Hello -

To better assist you can you please be more specific on your model. Is it a pickup C1500, or C2500 etc. Also you engine size in liter and the 8th digit of your VIN.
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Monday, March 16th, 2009 AT 2:21 PM
Tiny
SAGE455
  • MEMBER
1993 GMC Sierra 1500, 5.7L, The 8th digetin my VIN is a K. It is a pickup.
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Monday, March 16th, 2009 AT 5:30 PM
Tiny
IMPALASS
  • EXPERT
Hello -

Thanks for the info..........

If you would check to see what the DTCs are. Do you know how to read the codes? If not I have attached it below.

RETRIEVING CODES (NON-SCAN)
NOTE: The Assembly Line Data Link (ALDL) connector may also be referred to as the Data Link Connector (DLC) in flow charts. This is the same connector.

1. Turn ignition on with engine off. Malfunction Indicator Light (MIL) should glow. Locate Data Link Connector (DLC), attached to ECM wiring harness. Most DLCs are located under dash on driver's side of vehicle. For exact location of DLC, see appropriate COMPONENT LOCATIONS illustration in I - SYS/COMP TESTS article in this section. Turn ignition on. Insert jumper wire from terminal "B" (diagnostic test terminal) to terminal "A" (ground) of DLC. See Fig. 1.

NOTE: Inserting jumper wire into test and ground terminals of DLC with engine running will cause fuel-injected vehicles to enter field service mode and codes will not flash. See FIELD SERVICE MODE in BASIC TESTING article in this section.

2. Malfunction Indicator Light (MIL) should flash codes. Each code is flashed 3 times. If codes DO NOT flash, perform DIAGNOSTIC CIRCUIT CHECK (GASOLINE) in BASIC TESTING article in this section. To exit diagnostic mode, turn ignition off and remove jumper wire from DLC.


http://www.2carpros.com/forum/automotive_pictures/248015_Fig_1_2.jpg

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Monday, March 16th, 2009 AT 6:34 PM
Tiny
IMPALASS
  • EXPERT
Hello -

Thanks for the info..........

If you would check to see what the DTCs are. Do you know how to read the codes? If not I have attached it below.

RETRIEVING CODES (NON-SCAN)
NOTE: The Assembly Line Data Link (ALDL) connector may also be referred to as the Data Link Connector (DLC) in flow charts. This is the same connector.

1. Turn ignition on with engine off. Malfunction Indicator Light (MIL) should glow. Locate Data Link Connector (DLC), attached to ECM wiring harness. Most DLCs are located under dash on driver's side of vehicle. For exact location of DLC, see appropriate COMPONENT LOCATIONS illustration in I - SYS/COMP TESTS article in this section. Turn ignition on. Insert jumper wire from terminal "B" (diagnostic test terminal) to terminal "A" (ground) of DLC. See Fig. 1.

NOTE: Inserting jumper wire into test and ground terminals of DLC with engine running will cause fuel-injected vehicles to enter field service mode and codes will not flash. See FIELD SERVICE MODE in BASIC TESTING article in this section.

2. Malfunction Indicator Light (MIL) should flash codes. Each code is flashed 3 times. If codes DO NOT flash, perform DIAGNOSTIC CIRCUIT CHECK (GASOLINE) in BASIC TESTING article in this section. To exit diagnostic mode, turn ignition off and remove jumper wire from DLC.


http://www.2carpros.com/forum/automotive_pictures/248015_Fig_1_2.jpg



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Monday, March 16th, 2009 AT 6:35 PM

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