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About 96bulldogpower

  • Rank
    Old Iron Expert

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  • Location
    Dallas, Texas
  • Interests
    Workin on diesels

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  • Other Trucks
    1991 Mack CH613 2002 international eagle 1989 peterbilt 379 1995 chevrolet 8500

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  1. 96bulldogpower

    07 ctp713

    Replace fuse and try again. If it blows the new fuse then check wiring very closely to make sure the compressor clutch engagement wire is not shorting out somewhere intermittently with vibration. If wiring is good then perhaps the clutch is faulty. We had to run new wire from the a/c switch to the dashboard because we were never able to find the short. Ours was a 05’ CX, the new wiring fixed our issue.
  2. Hey guys! I recently acquired a new-to-me truck to add to our growing fleet. The truck is a 2008 mack CHU.. truck is great and everything but as with all CH’s, the headlights really suck. We have 4 CH models in our small fleet among other model trucks. We’ve tried everything from 100watt bulbs to HID and LED ballast bulbs Nothing will make the halogen housings produce great light on these trucks even after replacing housings with new ones. Ive seen the new 2018-19 pinnacle set-forward-axle trucks that are coming from the factory with LED heads and turn signals, the shape and relative design is nearly the same as all the older trucks but with the added benefit of great visibility and lighting performance. So i got to thinking, what would the cost of purchasing these headlight and turn signals cost from Mack? I can re-use my factory bezels, and if there are mounting differences, they would be simple to remedy. Any input is appreciated!
  3. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    By the way... I have the engine’s existing EECU at a ecu repair shop here local to me in Dallas, TX. They seem profesional.. I’ll let you guys know if it works! They claim the ecu will retain the factory data so that I wont have to take the truck to Mack to have it reflashed. They will save me a cool buck if it is successful.
  4. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    I was able to finally pull the valve covers off yesterday and found all of the intake pushrods were bent. The truck has engine brake but the exhaust side pushrods with the spring on them were fine not bent at all. I bought six new pushrods from Mack and installed them this morning, i cranked the truck up still using my other truck’s eecu, and it runs much better now. However there is a very loud “thud” noise still present... the sound is reminiscent of one of my other trucks years ago when it wiped a couple cam lobes. I’m almost certain this truck has a bad cam or failed lifters. When I reinstalled the rocker shaft assemblies with the new pushrods i noticed that at least on two exhaust side rockers there was so much rocker play that the pushrods could nearly come off the socket on the rocker. I ran out of time to work on the truck today but I guess the next step is to remove the oil pan and begin taking apart the front of the engine to pull the cam. I’m not very excited about this job at all, the last time we did an in house cam job parts alone cost us over $2000.
  5. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Okay NEWS! I swapped VECU from my 04 and nothing happened, then I swap the EECU and it started!! Then I plugged the original VECU and it still worked. Even the transmission works just fine! This means the truck’s original EECU is burned out! Now I’m going to start looking for a used EECU and hope that my Mack dealer will program it to my VIN. On another note, I thought I’d be happy to hear the engine running... unfortunately now that it runs, it revealed another issue, there’s a sound coming from the engine exactly like when our other truck wiped a cam lobe It sounds like a loud thud coming from one cylinder Although the engine doesn’t really shake as badly as our other truck when it wiped a lobe, and idle isfaily smooth with exception of the thud noise. The engine also blows a medium amount of black smoke when you press the accelerator.. I ran out of time today to mess with it, so I’ll get back to working on it this weekend hopefully, I’ll first remove the valve cover to see what’s going on. Any ideas?
  6. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Perfect! Sounds like a long shot but I’m willing to try anything to get this thing working! Tomorrow I’ll go ahead and swap ecu’s around while my 04 is at the yard. Hopefully it does the trick! And yes, I did check every relevant connector I could find, they all looked clean and dry. ill report back with what I find out by swapping out ecu’s first thing tomorrow!
  7. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Unfortunately I do not have a tech tool to scan the truck, I’m doing my best with what i have. QUESTION.. I have a 2004 cxn613 with the same AC motor, but this one is manual as opposed to the truck with the problem which has Allison automatic.... if i pulled the eecu and vecu from the 2004 and put them on the problem truck, would that work to help me rule out ecm failure? Or would t not even start because it has a different transmission?
  8. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    I’ll call my Mack dealer in the morning and see if they can diagnose computers on their bench, if that’s the case then I’ll pull them out and take them to the dealer to see what they have to say. I’ll report back as soon as I get an update!
  9. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Okay.. well I tested the resistance on the wires today. I had 60 ohms on the abs plug I disconnected. Then I reconnected it and tested both ways from the bulkhead connector at the firewall, I have 120 ohms both ways. I looked all over the harness coming down from the cab and even in between the frame rail and could not locate the three wire plug I did however find a two wire green and yellow connector (had black paint over the wires) but it had a cap at the end of the connector, I found this near the top of the transmission on the driver side frame rail. I believe what I found was a terminating resistor. Here’s a picture: I disconnected the batteries but the truck still has a blink code of 6-3, it turns over fine but refuses to start. could this really mean I have a bad ecm? If so, how would I go about finding out which one it is that’s bad?
  10. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Thank you SO much for these tips! I need to go out and buy a new multimeter tomorrow, I will report my findings as soon as I see what’s going on, thanks again!
  11. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Still not luck guys, I talked to my Mack dealership to see if they could help, their response was to purchase all new EECU, vecu, and vmack modules which totaled out to a crazy amount of money for something that may or may not fix the issue. I have blink code 6-3 and engine cranks over fine but won’t start, I’m stuck. Any help would be appreciated.
  12. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    I still can’t get the truck to start, the oil and rpm gauges don’t even move when turning over. Any ideas guys?
  13. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    I no longer have blink code 6-4. Now i have blink code 6-3. 6-3 is the only blink code in the system.
  14. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Not fixed yet, still trying to get the truck to start. So now that I have power to everything, I realize that the j1939 communications are still not working. The tachometer and the oil pressure gauge do not register anything while the truck runs on ether, the truck will not stay running on its own. This tells me that both the H and L wire (yellow and green wire) on the j1939 are not communicating. I cannot figure out why. I tested continuity inside and outside of the cab and verified the wires and connectors are in good condition. Does anyone have any tips on where to look next?
  15. 96bulldogpower

    Blink code 6-4 no-start CHN613 AC400/Allison.

    Update: found cause of no power to EECU, there were several damaged pins on the bulkhead connector at the firewall. Fuse #49 and abs now have power. Abs completes the test cycle “click” with key on run position. I tested power to the EJ2 connector at the EECU and there is now power to the EECU after repairing the damaged pins on the bulkhead connector. Everything is now live, abs, vecu, and EECU. Unfortunately I’m still not able to start the engine. I’m about to go get ether to try and carefully convince it to start, it has plenty of fuel in the tanks and filters are full of fuel.

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