Dirtymilkman Posted May 19, 2014 Share Posted May 19, 2014 Truck was backing up to a barn....driving said it just died. I checked for voltage everywhere, has it, no fault codes, cranks real nice, fuel primer is hard. Any ideas? Quote Link to comment Share on other sites More sharing options...
Bigdogtrucker Posted May 19, 2014 Share Posted May 19, 2014 I used to drive one of those.Tapped on the computer with a wrench,wait a few minutes and she'd crank right up!It did that from time to time til the boss bought a new computer.Worth a shot Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 19, 2014 Author Share Posted May 19, 2014 Lol, that'd be a easy fix. Quote Link to comment Share on other sites More sharing options...
Bigdogtrucker Posted May 19, 2014 Share Posted May 19, 2014 This was 10+ years ago,wasn't my regular truck.Was driving down the highway and she shut off like a plug was pulled!Called my buddy who drove that truck daily,he told me to do that.Sure as can be a few minutes later I was on my way.I remember my boss complaining about the cost off the computer and it being the size of a piece of toast...lol.Over $1,500- at the time. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 19, 2014 Author Share Posted May 19, 2014 Ouch Quote Link to comment Share on other sites More sharing options...
jnr_ate Posted May 20, 2014 Share Posted May 20, 2014 if it cranks hard and fast but doesn't start check your fuel pump. common fault to spin the plastic gear off the shaft. will hand pump all day but won't fire, 1 Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 20, 2014 Author Share Posted May 20, 2014 I have the updated pump in it. They say it "shouldn't" go bad. Quote Link to comment Share on other sites More sharing options...
wheeler73 Posted May 20, 2014 Share Posted May 20, 2014 It can go bad. I have seen the internal gear slip on the shaft. Also could be a module. Sometimes when they go bad there is no EML. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 20, 2014 Author Share Posted May 20, 2014 6-4 is only fault code. Have 55psi fuel pressure at the block, ECU's are communicating and even tried a spare ecu. No go. Quote Link to comment Share on other sites More sharing options...
jnr_ate Posted May 20, 2014 Share Posted May 20, 2014 what side is your ecu on, exhaust or inlet side. Quote Link to comment Share on other sites More sharing options...
jnr_ate Posted May 20, 2014 Share Posted May 20, 2014 6-4 is a link 1939 fault.check power your ecu from the fuse on the firewall panel(outside)the must be 3 power at the j2 engine ecu plug. pins 10 22 and 41. Quote Link to comment Share on other sites More sharing options...
jnr_ate Posted May 20, 2014 Share Posted May 20, 2014 check fuse 40 for open circuit. Quote Link to comment Share on other sites More sharing options...
jnr_ate Posted May 20, 2014 Share Posted May 20, 2014 longy82@hotmail.com. I can scan the info and send it. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 20, 2014 Author Share Posted May 20, 2014 Firewall fuse box had 12v going in and less than 5v coming out. Pulled it off and the back was corroded very bad. So a new box SHOULD cure this. (Fingers crossed). Quote Link to comment Share on other sites More sharing options...
jnr_ate Posted May 20, 2014 Share Posted May 20, 2014 nice work, if you want a copy of the fault codes I can email them to ya. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 20, 2014 Author Share Posted May 20, 2014 Thanks for the help jnr ate and wheeler Quote Link to comment Share on other sites More sharing options...
bbigrig Posted May 20, 2014 Share Posted May 20, 2014 That Firewall fuse panel was a BAD idea on engineering's part. 2 Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted May 21, 2014 Author Share Posted May 21, 2014 You're telling me.... Especially in Minnesota 1 Quote Link to comment Share on other sites More sharing options...
jnr_ate Posted May 24, 2014 Share Posted May 24, 2014 especially for housing such an important fuse. Quote Link to comment Share on other sites More sharing options...
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