427 Malfunction

[427dogs]

1992 427 r model mack, you can be driving along at any speed and it will quit, the wipers will come on. it especially does when its raining or you hit a water hole. if you turn the key off and back on again quick the truck takes off like nothing happened. but it did it to me on a hill fully loaded and it kept doing it. i cleaned all the grounds up, checked for bare wires , any help will be greatly appreciated. maybe computer prob,relay i dont know. thanks

[fjh]

1992 427 r model mack, you can be driving along at any speed and it will quit, the wipers will come on. it especially does when its raining or you hit a water hole. if you turn the key off and back on again quick the truck takes off like nothing happened. but it did it to me on a hill fully loaded and it kept doing it. i cleaned all the grounds up, checked for bare wires , any help will be greatly appreciated. maybe computer prob,relay i dont know. thanks

remove the kick panel in front of the glovebox check the plug on the vehicle ecu for corrosion

[Mackpro]

With engine running, grab fuel pump plug(round gray plug at fuel pump) and shake it and twist it, see if engine dies or sputters. We replace alot of harnesses on CH models but not many on R series.

[fjh]

With engine running, grab fuel pump plug(round gray plug at fuel pump) and shake it and twist it, see if engine dies or sputters. We replace alot of harnesses on CH models but not many on R series.

Another common spot on an RD is the plug at the rh cab harness take a 1/4 inch socket and unscrew that plug that goes to the fire wall and heck to see if it is corroded!Most of thes fixes pertain to how the engine runns I can't think of a reason that the wipers would go on there own!