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GM computer timing at idle
Hi everyone, I am trying to figure out if a 30 degree btdc at 600 rpm idle with ect at 200 F and Iat at 85 F a normal timing? Engine runs very smooth at idle but high HC reading at about 200ppm (With catalyst) Thanks for your help Login to read more. 
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| Engine | 7.4 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1996 Chevrolet C3500 7.4L
| Engine | 7.4 L |
| Trans | 4-speed Automatic (Electronic) |
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