Timing Adjustment

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  #1  
Old 09-30-09, 08:37 PM
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Join Date: Sep 2009
Location: Indiana
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Unhappy Timing Adjustment

Hi new to this forum, Replaced 4.3 motor in a 1994 olds Bravada. Need to find out how to set the timing. runs ok but timing just a little off need help
 
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  #2  
Old 10-01-09, 07:05 AM
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Join Date: Sep 2009
Location: tulsa, ok
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HOPE THIS HELPS, YOU WILL NEED A TIMING LIGHT AND A 9/16 OR 15 MM GEAR WRENCH WITH A SWIVEL HEAD TO LOSEN UP THE DISTRIBUTOR
Section 6A - Ignition Set Timing Connector Location

Models:
1994 Chevrolet and GMC Truck S/T Models
1994 Oldsmobile Bravada
with 4.3L Engine (VINs W, Z - RPOs L35, LB4)

The location of the Set Timing Connector is incorrectly called out in "Section 6A" (Page 6A-8) of the "Driveability, Emissions and Electrical Diagnosis", Service Manual and in the 1994 Oldsmobile Bravada Service Manual Supplement (Page 6E3-C4-8).

The correct location of the Set Timing Connector is inside the cab where the Heater Box and the carpet meet on the passenger side floor.

Pull carpet back to expose the single wire and connectors on the outside of the control module harness. The wire colors are tan with a black stripe.

When using a timing light connect an adapter between the No. 1 spark plug and the No. 1 spark plug cable, or use an inductive type pickup. Do NOT pierce the spark plug cable. Once the insulation of the spark plug cable has been broken, voltage will jump to the nearest ground, and the spark plug will not fire properly.
Some engines incorporate a magnetic timing probe hole for use with special electronic timing equipment. Consult manufacture's instructions for use of this equipment.
On the V6 engine, the system will go into bypass mode by disconnecting the timing connector. This is a single wire sealed connector that has a tan with black stripe lead. On the 4.3L engine, this connector is in the cab where the Heater Box and the carpet meet on the passenger side floor.

The timing specifications for the 4.3L engine is 0TDC.

Set timing under the following conditions:


Normal operating temperature.
Air cleaner installed.
A/C "OFF".
Transmission in neutral.
Disconnect SET TIMING connector (tan/black wire) located in the cab where the Heater Box and the carpet meet on the passenger side floor. DO NOT disconnect 4 wire connector at distributor.
Connect timing light and adjust as necessary by loosening hold down bolt and rotating distributor. For specification, refer to SPECIFICATIONS/TIMING MARKS. Tighten hold down and recheck the timing. Stop the engine and connect SET TIMING connector. Clear control module trouble code by disconnecting control module power source or use bidirectional scanner.
 

Last edited by DIRTWRKZ; 10-01-09 at 07:07 AM. Reason: MORE INFO
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