Mechanics

IGNITION TIMING

1999 Chevrolet Suburban • V8 4WD Automatic • 95,056 miles

What is the ignition timing on a 1999 Chev 3/4 ton Suburban 5.7 liter, the scanner shows 23 degrees, I had just replaced the intake manifold gaskets
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Joe Wulfekuhle
December 28, 2010.



The ignition timing cannot be adjusted. The distributor may need adjusting to prevent crossfire. To insure proper alignment of the distributor, perform the following: With the ignition OFF, connect the scan tool.
Start the engine. Allow the engine to idle until the engine reaches normal operating temperature.
IMPORTANT: Cam Retard Offset reading will not be accurate below 1,000 RPM.

Increase engine speed to 1,000 RPM while performing the following steps.
Use the scan tool in order to monitor the Cam Retard Offset.
If the Cam Retard indicates a value of 0 degrees, the distributor is properly adjusted.
If the Cam Retard does not indicate 0 degrees, the distributor must be adjusted.
ADJUSTING PROCEDURE

With the engine OFF, slightly loosen the distributor hold down bolt.
IMPORTANT: Cam Retard Offset reading will not be accurate below 1,000 RPM.

Start the engine and raise the engine speed to 1,000 RPM.
Use the scan tool in order to monitor the Cam Retard Offset.
Rotate the distributor as follows: To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
To compensate for a positive reading, rotate the distributor in the clockwise direction.
Repeat step 4 until 0 degrees is obtained.
Turn OFF the ignition.
NOTE: Refer to Fastener Notice in Cautions and Notices.

Tighten the distributor hold-down bolt.
Tighten
Tighten the bolt to 3 N.M (25 lb ft).

Start the engine.
Raise the engine speed to 1,000 RPM and view the Camshaft Retard Offset.

Rasmataz
Dec 28, 2010.
This worked excellent, thank you so much for your quick response. No more check engine light.

Tiny
Joe Wulfekuhle
Dec 28, 2010.