Use jumper wire to temporarily advance timing on DB2 HPCA?

[NCBloodhound]

Is there any reason not to use a jumper wire to the HPCA on the DB2 to temporarily advance the timing 6 degrees?

 

[Matt65]

When you say temporarily, how long-Minutes, hours?

Out of curiosity, why are you after a temporary advance? You can also advance by rotating the DB2 at its 3 mounting bolts.

 

[NCBloodhound]

Maybe an hour or so while I make a quick trip. I know I can advance the timing by rotating the DB2, but I thought using the jumper would work for now until I get a new IP. I'm pretty sure mine is shot, but I need to limp my truck to a friends.

 

[Chief_919]

You can do it, however you need to also have the fast idle solenoid engaged. If you don't the mechanism that advances the timing will also create a dead spot the first few degrees of throttle application, then it kicks in. The fast idle solenoid takes up that slack.

They are both on the same circuit, so just make sure you hook both to 12v at once.

If you have a manual glow plug switch that is you you get the cold start advance back.

 

[NCBloodhound]

You can do it, however you need to also have the fast idle solenoid engaged. If you don't the mechanism that advances the timing will also create a dead spot the first few degrees of throttle application, then it kicks in. The fast idle solenoid takes up that slack.

They are both on the same circuit, so just make sure you hook both to 12v at once.

If you have a manual glow plug switch that is you you get the cold start advance back.

Makes sense. I will give that a shot. Is there any down side to doing it longer term? Say a week of daily driving?

 

[Matt65]

For driving any distance Im curious if it would have a negative impact on a warm engine: would EGTs get too high, would it stress the rotating assembly etc? Personally I would only do this as a very last resort, or not at all. You wouldn't want to kill the engine in addition to the already failing pump.