Question about 1999 Chevrolet Silverado 1500

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Hello i have a 1993 chevrolet silverado 1500 and i jus replaced the fuel pump and the distributor and now it wont stay running and it back fires can u tell wat might be wrong

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Hello theman022002,

Your description would indicate that the timing is off. Possibly when you installed the new distributor you were off a tooth or two. Turning the distributor Will Not adjust the timing.

You will need to reinstall the distributor with every thing set to top dead center, then follow the steps below to set the proper cam retard offset.

Good Luck.

Ignition Timing: Adjustments

TEST PROCEDURE
The ignition timing cannot be adjusted. The distributor may need adjusting to prevent crossfire. To insure proper alignment of the distributor, perform the following:

1. With the ignition OFF, connect the scan tool.
2. 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.

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

ADJUSTING PROCEDURE
1. With the engine OFF, slightly loosen the distributor hold down bolt.

IMPORTANT: Cam retard Offset reading will not be accurate below 1,000 RPM.

2. Start the engine and raise the engine speed to 1,000 RPM.
3. Use the scan tool in order to monitor the Cam retard Offset.
4. Rotate the distributor as follows:
a. To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
b. To compensate for a positive reading, rotate the distributor in the clockwise direction.
5. Repeat step 4 until 0 degrees is obtained.
6. Turn OFF the ignition.

NOTE: Refer to Fastener Notice in Cautions and Notices.

7. Tighten the distributor hold-down bolt to 3 N.M. (25 lb ft).
8. Start the engine.
9. Raise the engine speed to 1,000 RPM and with the scan tool view the Camshaft retard Offset to verify 0 degrees has been maintained.

Regards,
netvan

Posted on Apr 10, 2011

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