A friend wanted me to post this question. He has a 97 12v with a #12 fuel plate that he had someone set the timing on 15.5 The truck now has a miss at idle and smooths out at 2000rpm's. Said he lost a lot of bottom end power. Did the timing get set higher than 15.5 or what. How do the 12v trucks run with the timing advanced. Hope someone can help. Thanks

 

Can someone describe how a 12V truck runs with the timing on 15.5 any answer would be greatly appreciated.

 

I have mine set around that .I pull a 5th wheel with a combined weight of around 19k and I have no problem If I put my foot in it moves like one would take of normally with a empty truck.Mine does not miss but has been getting a little bit of a shake at idle the motor has around 185k on stock injectors.I never drove it with out the timing set were it is now.
Does it smoke any ? If so what color is it?

 

He said his motor shakes at idle, said he is getting the timing set back to 13.5
I read something on piers diesel, 1 degree of timing is good 2 degrees not on a close to stock truck. Thanks for the reply.