Bj Hinson Posted January 16, 2014 Share Posted January 16, 2014 I have a 1993 R model with a 400 Mack. It will rev wide open then shut itself down. I checked the turbos for oil and they are clean. I thought it could be getting to much air so I replaced all of the fuel lines from the tank to the fuel pump and it is still happening. Other than the pins on the plug in to the fuel selenoid on the fuel pump being worn or having a bad connection I am at a loss for what to try next. Any Ideas. Quote Link to comment Share on other sites More sharing options...
rsb502 Posted January 16, 2014 Share Posted January 16, 2014 Is this a vmac truck or mechanical? (Electronic pedal or throttle linkage?) Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
Bj Hinson Posted January 17, 2014 Author Share Posted January 17, 2014 It is an electronically controlled motor. Electronic foot feed and the cruise and high idle are both electronic. Quote Link to comment Share on other sites More sharing options...
Glensts Posted January 18, 2014 Share Posted January 18, 2014 If the throttle is partially responsive or non responsive, the foot pedal potentiometer could be not working or became unhooked. I have had them screw up but usually it would throw a code first and then work enough to get me home Quote Link to comment Share on other sites More sharing options...
rsb502 Posted January 18, 2014 Share Posted January 18, 2014 I had a bad connection in the pump harness do the same thing to my 93 CH E7 vmac 400, had a bad connection on two wires due to melting of the [plastic around the pins. This is the round Bosch style connector just to the left of the pump on the pass side of the engine. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
rickykarenpr Posted January 18, 2014 Share Posted January 18, 2014 do you have a picture Quote Link to comment Share on other sites More sharing options...
Bj Hinson Posted January 20, 2014 Author Share Posted January 20, 2014 The manual says it should have a electronic actuator on the back of the pump but there's no wires on the back just a fuel shut off on the side. I'm sure it's mechanical Quote Link to comment Share on other sites More sharing options...
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