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Category: Chevy
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Experience:  Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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1999 chevy suburban 1500: 5.7 SFI eng

Resolved Question:

1999 chevy suburban 1500 V8 5.7 SFI eng. can't adjust ignition timing...How do i adjust distributor & shut off or reset the "service engine soon" light?
Submitted: 7 years ago.
Category: Chevy
Expert:  Bob replied 7 years ago.

The timing on the unit can not be set with a timing light in the conventional way. You must check cam angle offset with a class 2 scan tool to get it correct. I'm sending you the GM procedure, I hope it helps. Print a copy for reference.

  • For V8 engines, connect a scan tool.
  • Monitor the Camshaft Retard Offset value. Refer to Engine Controls Camshaft Retard Offset Adjustment.

    Important: If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.

  • Refer to Installation Procedure 2 for proper distributor installation.
  • Installation Procedure 2


      Object Number: 334551  Size: SH

      Important: Rotate the number 1 cylinder to Top Dead Center (TDC) of the compression stroke. The engine front cover has 2 alignment tabs and the crankshaft balancer has 2 alignment marks (spaced 90 degrees apart) which are used for positioning number 1 piston at top dead center (TDC). With the piston on the compression stroke and at top dead center, the crankshaft balancer alignment mark (1) must align with the engine front cover tab (2) and the crankshaft balancer alignment mark (4) must align with the engine front cover tab (3).

    1. Rotate the crankshaft balancer clockwise until the alignment marks on the crankshaft balancer are aligned with the tabs on the engine front cover and the number 1 piston is at top dead center of the compression stroke.
      Object Number: 301395  Size: SH

    2. Align white paint mark on the bottom stem of the distributor, and the pre-drilled indent hole in the bottom of the gear (3).

      Notice: The ignition system distributor driven gear and rotor may be installed in multiple positions. In order to avoid mistakes, mark the distributor on the following components in order to ensure the same mounting position upon reassembly:

      The distributor driven gear
      The distributor shaft
      The rotor holes
      Installing the driven gear 180 degrees out of alignment, or locating the rotor in the wrong holes, will cause a no-start condition. Premature engine wear or damage may result.

       

    3. With the gear in this position, the rotor segment should be positioned as shown for a V6 engine (1) or V8 engine (2).
      - The alignment will not be exact.
      - If the driven gear is installed incorrectly, the dimple will be approximately 180 degrees opposite of the rotor segment when the gear is installed in the distributor.

      Object Number: 34397  Size: SH

    4. Using a long screw driver, align the oil pump drive shaft to the drive tab of the distributor.
    5. Guide the distributor into the engine. Ensure that the spark plug towers are perpendicular to the centerline of the engine.
      Object Number: 4350  Size: SH

    6. Once the distributor is fully seated, the rotor segment should be aligned with the pointer cast into the distributor base.
      - This pointer may have a 6 cast into it, indicating that the distributor is to be used on a 6 cylinder engine or a 8 cast into it, indicating that the distributor is to be used on a 8 cylinder engine.
      - If the rotor segment does not come within a few degrees of the pointer, the gear mesh between the distributor and the camshaft may be off a tooth or more.
      - If this is the case, repeat the procedure again in order to achieve proper alignment.

      Object Number: 366609  Size: SH

      Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    7. Install the distributor mounting clamp bolt.

      Tighten
      Tighten the distributor clamp bolt to 25 N·m (18 lb ft).


      Object Number: 301393  Size: SH

    8. Install the distributor cap.
    9. Install two NEW distributor cap screws.

      Tighten
      Tighten the screws to 2.4 N·m (21 lb in).

    10. Install the electrical connector to the distributor.
    11. Install the spark plug wires to the distributor cap.
      Object Number: 341359  Size: SH

    12. Install the ignition coil wire. The wire must not touch anything like the dip stick. Rubbing will make a ground/short after time of use.
      Object Number: 18446  Size: SH

    13. For V8 engines, connect a scan tool.
    14. Monitor the Camshaft Retard Offset value. Refer to Engine Controls Camshaft Retard Offset Adjustment.

      Important: If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly.

    15. Refer to Installation Procedure 2 for proper distributor installation.
    Bob, Auto Tech
    Category: Chevy
    Satisfied Customers: 4087
    Experience: Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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    Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)