Question about 2004 Chevrolet Tahoe

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Delay in shifting when excelerating

04 tahoe Z-71 5.3L Z-motor auto transmission approx. 79,000 miles. It started with diagnostics showing fuel pump faulty (replaced worked fine for a month) then check engine light came on again this time showed 2 of the O-2 sensors bad both replaced and ran fine when mechanic performed drive test. When I left and was driving back home the hesitation isn't as bad but can tell now sinces it's not sputtering and no response when excelerater pressed that the transmission has a delay shifting gears. fluid levels verified all show good. Approx. 5,000 miles ago had injectors cleaned and transmission fluids and filter changed. The mechanic (pep boys) seem to think it may be a "shift sensor" (unable to find such a sensor in any manual or on-line) could it be called something else or could it be something else all together?

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  • LAYNRAIL
    LAYNRAIL May 11, 2010

    what do you mean has a delay in shifting? how long of a delay? is it slipping slowly into gear, or just not shifting for a few seconds then going in normally

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  • 37 Answers

Throttle position sensor, but check fuel filter first

Posted on Dec 30, 2009

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Priority Action Part Type Cause
1 Inspect Battery Battery Discharged or Faulty.
2 Inspect Battery Cable Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
4 Inspect Distributor Cap Distributor Cap Cracked or Burned contacts.
5 Inspect Coil - Ignition Faulty Ignition Coil.
6 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter Starter Motor Faulty.
9 Inspect Fuel Pump Low Fuel Pressure.
10 Inspect Solenoid Switch Faulty Starter Solenoid Switch.
11 Inspect Relay - Fuel Pump Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Motor Faulty Starter Motor.
15 Inspect Fuel Injector Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer Incorrect Operating Information Being Delivered and Sent From The ECC.
18 Inspect Fuel Tank Fuel Tank Empty.
19 Inspect Carburetor Carburetor Flooded or Faulty Choke.
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NUMBER: 21-004-05
GROUP: Transmission
DATE: January 22, 2005
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 21-007-04, DATED MAY 11, 2004, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDES, ADDITIONAL MODEL YEARS.
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Transmission Delayed Engagement

OVERVIEW:
This bulletin involves replacing the front pump assembly in the transmission and checking the Transmission Control Module (TCM) for the latest software revision level.

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