stackman1996 Posted August 18, 2014 Share Posted August 18, 2014 I have a 2003 460 that keeps taking out 5 and 2 eup about every 6 months it will throw the code when it is cold but when it goes over 190 degrees it will quit but will come back when it cools down Quote Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/ Share on other sites More sharing options...
j_martell Posted August 18, 2014 Share Posted August 18, 2014 Check the wiring, seem to think they were known for chewing through the insulation where the wiring goes under the valve cover(?)...if it checks out, move the faulty injectors and see if the codes follow the "bad" injectors.....That's just what I've absorbed from reading on here....someone with more knowledge will likely chime in.... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-256489 Share on other sites More sharing options...
bbigrig Posted August 19, 2014 Share Posted August 19, 2014 Check the wiring, seem to think they were known for chewing through the insulation where the wiring goes under the valve cover(?)...if it checks out, move the faulty injectors and see if the codes follow the "bad" injectors.....That's just what I've absorbed from reading on here....someone with more knowledge will likely chime in....Pssst.......His engine is an ASET....The wiriing for the EUP's don't go through the valve cover.....You may be thinking of an MP motor for injector wiring.(The only engine "Mack" has ever built with wiring into the valve cover for fuel management 2007 and up) (I know your heart is in the right spot martell)It probably is 2 bad EUP's that sort them selves out as they warm up. It happens like a bad injector. Or a crappy solenoids that needs warmth to operate better. But yes could also be wiring in your harness that runs along the block on the passenger side to the ECM on the driver side.Needs further Diagnosis. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-256504 Share on other sites More sharing options...
stackman1996 Posted August 19, 2014 Author Share Posted August 19, 2014 Wiring has been checked. No striped insulation. But if ther is a bad spot inside I could not find it. Is there a way to check the solenoid or wiring with a voltage tester. Is there a set amount of volts amps or resistance. The injectors are 10 months old and have about 50000 miles. I changed them when I changed 2 and 5 eup last October. Quote Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-256515 Share on other sites More sharing options...
bbigrig Posted August 19, 2014 Share Posted August 19, 2014 Hmmmmm. If you changed the EUP's that are problem childs that takes care of those possibilities. I was going to suggest shooting the solenoids with like 100-200V and seeing if the solenoids fail.You have replaced all of the injectors so if properly installed they can be ruled out.Is there any loss of prime issues on start up? Someone correct me if I'm wrong but cant low fuel pressure cause those codes sometimes???? Strange that its the same ones everytime which makes me go back to wiring or ECM.There could be an issue with the ECM in the driver for those EUP's. If you say the wiring is ok to said EUP's you have ruled out a fair bit on your own. Quote Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-256558 Share on other sites More sharing options...
j_martell Posted August 19, 2014 Share Posted August 19, 2014 See?! I KNEW someone who knows what they're talking about would be along.... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-256571 Share on other sites More sharing options...
stackman1996 Posted August 19, 2014 Author Share Posted August 19, 2014 Do you know if 2 and 5 share a driver? If I change eups around for trouble shooting.do I need to change the cal codes Quote Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-256594 Share on other sites More sharing options...
wheeler73 Posted August 19, 2014 Share Posted August 19, 2014 No it will run fine without changing the cal codes. Quote Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-256643 Share on other sites More sharing options...
stackman1996 Posted August 31, 2014 Author Share Posted August 31, 2014 I switched eup 5 and 3 around and the error code stayed with 5. If low fuel pressure could be a problem what should it be ? Quote Link to comment https://www.bigmacktrucks.com/topic/36743-persist-8-5-8-2-codes/#findComment-257981 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.