gofast51

Does anybody know what the DRP ocurred flag is in winaldl? It seems to follow the rich flag. Idon't know what it means so I don't know if I should be watching it for any reason.

IROCThe5.7L

I'm not too sure. Here's what my datamaster help file says:

"This displays the current engine RPM as calculated from the Distributor Reference Pulse (DRP) rate. This allows displaying RPM Values well above the 8-bit datastream limit of 6375 RPM."

"Note that because DRP is measured at a slightly different point in time, and with greater precision than the ‘normal’ RPM calculation, the value is often 10-15 RPM different than the ‘normal’ RPM reading. This will be particularly evident during hard acceleration."

gofast51

Thank you for your reply. I wonder if this flag flashing on and off at idle maybe a sign of a worn distributor/ spark scatter?

Mangus

If reference pulses did not occur, the ECM would throw an error (41). DRPs are in fact a very necessary thing in order for the injectors to fire.

A google search on "Distributor Reference Pulse" should yield some info on what it is and what it is responsible for.