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JOHN aka Eauto
JOHN aka Eauto, The Car Guy
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I replaced the cam and lifters in my 1998 K2500 with a 454

Customer Question

I replaced the cam and lifters in my 1998 K2500 with a 454 vortec engine. I can't get my distributor timing set correctly. I have stabbed my distributor 4 times and the the closest cam offset I can get is -17 degrees on the scan tool. Do you think my cam timing is off a tooth?
Submitted: 5 months ago.
Category: Chevy
Expert:  JOHN aka Eauto replied 5 months ago.

have you double checked the timing marks on the timing chain?

Customer: replied 5 months ago.
I haven't yet. Wanted a second opinion before taking the front of the engine apart again.
Expert:  JOHN aka Eauto replied 5 months ago.

BASE TIMING
The distributor ignition system has no provision for timing adjustment. The base timing is preset when the engine is manufactured and no adjustment is possible.

The distributor may need adjusting to prevent crossfire.

Refer to Camshaft Retard Offset Adjustment See: Camshaft Retard Offset Adjustment

Ignition timing can only be changed by reprogramming the PCM using Techline Information System 2000 (TIS 2000) PC, and the Tech 2 scan tool. Please contact your dealer for necessary updates and procedures.

Expert:  JOHN aka Eauto replied 5 months ago.

Camshaft Retard Offset Adjustment

Camshaft Retard Offset Test

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, install a scan tool to the DLC.
  2. Start the engine and bring to normal operating temperature.

Important: Cam Retard Offset reading will not be accurate below 1,000 RPM.

  1. Increase engine speed to 1,000 RPM.
  2. Monitor the Cam Retard Offset.
  3. If the Cam Retard indicates a value of 0 degree + or -2 degree, the distributor is properly adjusted.
  4. If the Cam Retard does not indicate 0 degree + or - 2 degree, the distributor must be adjusted.

Adjusting Camshaft Retard Offset

  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.

  1. Start the engine and raise engine speed to 1,000 RPM.
  2. Using a scan tool monitor Cam Retard Offset.
  3. Rotate the distributor as follows:

4.1. To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
4.2. To compensate for a positive reading, rotate the distributor in the clockwise direction.

  1. Repeat step 4 until 0� + or - 2� is obtained.
  2. Turn the ignition OFF.
  3. Tighten the distributor hold-down bolt to 33 Nm (25 lb.ft.).
  4. Start the engine, raise engine speed to 1,000 RPM and recheck Camshaft Retard Offset
Customer: replied 5 months ago.
I have done that but I cannot the cam retard offset even close to 0 degrees. The closest I can get is -17 degrees and the check engine light comes on and P1345 set.
Expert:  JOHN aka Eauto replied 5 months ago.

then your off a tooth pull the timing cover

Customer: replied 5 months ago.
I have checked the timing marks and they are right on.According to All-data the crankshaft reluctor ring needs to be replaced if it is removed. I did not replace it but I don't see any reason to. Have you seen that to be a problem?
Expert:  JOHN aka Eauto replied 5 months ago.

i have not but 454 s are not that common at the dealership any more

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