[pbatura]

Greetings!

Just replaced the cam synchro drive (was squealing) and now the timing seems off, based on how it is running.

I followed the normal procedures, marking things prior to removal. I reused the original sensor, so I'm wondering if the sensor is bad or if I just need to adjust the synchro position.

Any idea what the base timing is supposed to be?

Here's some data -

Timing RPM
12 695
12.5 694
11.5 706
13.5 702
12.5 730
13 700
12.5 715
32 1004
35.5 1614
40.5 1690
40.5 1658
40.5 1636
40.5 1612
40.5 1597
39.5 1330
38 1032
35 922
34.5 876
32.5 834
28.5 699
24.5 678
19 686
14.5 685
14 685

 

[Jeff K]

Base ignition timing depends on the relative location of the 36-1 reluctor wheel on the crank snout and the CKP (crank position sensor), and has nothing to do with the CMP in any way. CMP controls fuel injector timing on an SEFI engine and provides the PCM with " is the #1 cyl on the compression or exhaust stroke" info only.