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About Onestitch

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    Engine Started

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  1. I pulled and changed fuel filters and no start so I checked voltage at fuel shut off selenoid and I am not getting any voltage so think I found my problem but it is not showing any fault codes ...lightning bolt light only comes on for 3 seconds then goes off when I turn key on ...I try to retrieve codes thru the cruise control switch resume button but it dont show any faults and I image lightning bolt light would stay on when I turn the key if it was throwing a code or fault but it just comes on for 3 seconds and goes off
  2. I found it ...bulb was burned out ...lightning bolt lights up when I turn key for 3 seconds then goes off so I imagine computer is not throwing any codes I can retrieve ...this is stumping me because still no voltage at fuel shut off selenoid by the fuel pump ...
  3. Where is the fault lamp location at on the dash of the 1993 RD ...I think my bulb is burnt out because never comes on ...Is it locates right above cruise control switches ? Or is it located by the tach and speedometer ?
  4. Does any one know where the location of my 93 RD688 ecm is ...I believe it is a V Mac 1 ...
  5. My 1993 mack rd688 with the E7 400 will not start...can run it on starting fluid but will not run with out starting fluid so no fuel problem ...started by changing all the fuel filters and no start so I checked for voltage at the fuel shut down solenoid and nothing ...checked the shut down relay and it seems to be working and swapped it out with other relays that I know work and still no voltage at shut down solenoid ...the relay clicks when I turn key on or plug it in like all my other relays ...my question is there something else that will cause a fuel solenoid shut down ..like maybe ECU or a sensor somewhere?
  6. I bought a 1993 Mack rd 688 E7 400 engine and the guy I bought from said it has all new injectors and it looks like all new fuel filters and truck would run and start great ..just bump the key and it would start right up ...then it slowly got to where it would start taking longer cranking to start but it would run great when running ...went to start yesterday and cranks but no start ...it will run on starting fluid but then die ...tank is 3/4 full of diesel...were should I start trouble shooting this ? Pull the fuel filters and check for full ? How do I test the fuel pump or transfer pump ? And I do not see a primer hand pump on this thing anywhere..do some not have them ? Do the 93 Mack E7 have a ecu that controls the injector pump ...truck does have cruise control switches on dash but I never tried it ...the previous owner said cruise control worked great on it so I assume it is electronically controlled ...I have basic mechanical skills on all my smaller vehicles ..I replaced the injectors on my 2001 Duramax my self do all my own mechanic work on everything I own ...but this is my first big rig I have owned ...Thanks and any in sight would sure be help full ...
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