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deercreek

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  1. Okay, thanks for the helpfull info. They also found some debris in the fuel lines and tank so we may have two things going on here. Thats good news on the ecm, hopefully a washing out will be good enough for it. Its sorta spendy. They are saying they first want to replace the harness and then see what the ecm does after replacing it. So hopefully it will be all good. The truck was one that we rebuilt, it had layed over(I think) on the drivers side, so maybe that is part of the reason there was oil coming up that harness, beings the ecm is on the drivers side
  2. Thanks alot for all the info. We ended up taking the truck to our local Mack Dealership. They finally got to it and called today. They said there was some oil in the engine harness and where the connector connects into the ecm? They were thinking that might be part of the problem. Have you heard of something like that? Replacing all that won't be cheap. They were going to do a test to check for air in the fuel lines and havent heard back from them yet. I just can't quite see how it would be the ecm, would think it would cause more random issues.
  3. Decided to start a new thread on this as I really need some help. Have an 08 Mack granite gu713 that has been giving some grief. Its giving this code MID 128 PID 94 FMI 7 which appears to be related to the fuel system. We have replaced the fuel filters about 3 times, blew out the accesible fuel lines countless times. It is an intermediate problem. Sometimes it will work great with no problems and other times it will act like its starving for fuel and hiccup/carry on and even shut off sometimes. The truck is currently at our local diesel truck mechanic, he is now thinking it might be electrical, I have had it down there like 3 times already, seems it always works good when he drives it. Does anyone have any suggestions on what it might be?
  4. Would appreciate ya'lls help. Got the truck back together and was planning to get it inspected and have been having some trouble. Am getting this code: MID 128 PID 94 FMI 7 • Mechanical system not responding properly • Drop in fuel pressure • Engine derate • Clogged fuel filter • Faulty fuel pressure sensor • Leaking fuel line or fitting • Poor fuel pump response I had it out in 8 degree weather the first time and it must have almost gelled up so I put some additive thru it and managed to get it back home. Anyway I decided to replace the fuel filters since I was getting this code but the truck is still not working right. It's obviously something with the fuel and it runs kinda rough and then just shut off. We blew out the fuel pump line to make sure there was nothing in there and it appears to be fine. So we are kinda up against. Is there something else that we are missing? The water/fuel seperator sight glass is full, not sure if it's supposed to be empty or full?
  5. Name: Mack GU713 (2008) Date Added: 30 December 2011 - 05:56 PM Owner: deercreek Short Description: Work in progress. Bought with some damage and repairing it. View Vehicle
  6. Oh ok, Thanks alot trey for all your help, it has been a great benefit for me. I was just hoping this wasn't going to lead to some major problem but I think you have explained both issues very well and that most likely is the problem. I think maybe you are right, it is pdlo, I couldn't quite remember. It was located right below the electronic malfuntion light on the left hand side of the cluster where all the different symbols are etc. I might have to put on the exhaust system out at the body shop so I can drive it home alittle faster!! Will keep you updated but hopefully everything will fall into place when I reconnect that sensor. Jonathan I also added some pictures of the truck below so you can see what for project we got going on. Will have to update it with finished pictures when its done!!
  7. Yes, I will have to do that. I did have another issue come up when driving it over to the body shop, It would not go over 15 mph its almost like its in limp mode, its obviously the computer that is topping it out. The engine will rev up the whole way when in N etc. It was a very slow ride over there. The engine light is on and also something that says "dplo" couldn't find anything in the manual relating to that word so not sure what it is? Does somebody know? The other thing I thought of that maybe is putting it in limp mode is because we removed the exhaust pipes(to repair the cab easier), There was a sensor on the one pipe that I had just disconnected, so I'm wondering if maybe that is related somehow. Would sure appreciate any thoughts on this? Jonathan
  8. Got good news, got everything back together and the truck runs like a top. Got to drive it around the drive abit and the effort payed off. Thanks so much for all the help.
  9. I just got done looking over that a/c compressor pulley real good and I think I found the problem. the pulley appears to have been hit by something and put a dent into it. It's not real bad but I don't think its quite turning straight and a few of the grooves at that spot are pushed over just a bit. Thanks for the info on driving it, that was the thing I was worried about. I guess I will just have to buckle down and get a new fan installed and a/c compressor and hope that clears up the problems. One more question, If the fan is out of balance would that mean the clutch is as well or can that thing take a pretty good beating before it messes that up? I just don't want to replace the fan and then here the clutch is bent or something, which I don't think it is.
  10. Thanks trey for your help, Does the a/c pulley need to be turning freely, wasn't sure if there is a clutch or something on that? I almost think the a/c pulley wasn't turning freely(will need to double check), I had just assumed that is the way that is but I am probably wrong and that may be the problem of why that belt is shredding. Also if I took it slow and the batteries were fully charged you think I could drive it slowly down the road for about 10 miles? without the belts in place? I would obviously have to watch the tempature etc? I had things lined up for the body guy and now I'm having this other trouble. Thanks so much for your help, Jonathan
  11. Just had another issue now. When we first got the truck the fan belt was off and the alternator belt was shredded. So we straigtened out the shroud the best we could put the fan belt and another alternator belt on and it wasnt rubbing nearly as bad. Anyway we had the truck running here again and here the alternator belt shredded and the fan belt is starting to come off again. Could this be cause by an out of balance fan and it rubbing against the shroud or is this another issue? Was hoping to drive it 10 miles to our bodyshop to repair the cab but not sure if it would be alright to do that without the drive belts on? We obviously need to get the fan taken care of as well
  12. Thanks alot for your help so far. I didn't realize the power steering/ fluid is seperate from the tranny fluid. It appears like the reservoir is empty so there probably won't be much fluid coming out. I will probably just have to replace the fan. It seems like it got knocked around when it layed over. It does look like a real pain to replace though and I can't figure out exactly what all needs to come out other than alot of stuff.
  13. We have a 2008 Mack Gu713 Mp8 daycab truck that we bought with some body damage and are fixing up. This is our first mack and still trying to learn the ropes on this. First off, the truck layed over on the passenger side, the truck runs and drives great with no loss of oil and good oil pressure. Have a few things that came up and hoping maybe you can help me out with: 1st: There was some tranny fluid leaking and finally figured out it was coming from the power steering oil cooler(passenger side frame rail), the power steering wasn't working either. It looks fairly easy to replace but was wondering if I can replace the cooler without draining the tranny fluid and not making a big mess? Or would it be best to drain and then replace? 2nd: The fan schroud had a few bends in it and also the fan got one of the blades partly torn off(about a 3 inch piece off the corner). Is it a big challenge to replace that fan, (it's only one of the blades, could maybe just run it as is but not sure?). Does the whole clutch have to come off as well? Thanks alot for your help and can't wait to get this thing all fixed up and running down the road.
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