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Big Dog
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Posts posted by steeler

  1. 1 minute ago, Ahubbard said:

    Yes I will get that feeling when I drive. Almost feels like the spring is too light on the throttle return even though it’s not. I will let my foot of the throttle some and lay back in to correct that sometimes.

    When this does it at 1200 it almost is like a horse galloping. Rhythmic and kinda shakes the motor.

    Sent from my iPhone using Tapatalk

    Yup sure sounds like resonant ride. Unfortunately I'm not sure there's much you can do to fix it. We've sent pumps out before, some were better, most weren't. I'll do some digging about that contraption Mack came out with.

    Maybe someone else here knows of a fix?

  2. Yes, resonant ride in the pump feels kinda like the fuel rack in the pump is bouncing back and forth, usually right around that rpm. 

    I remember it being a big pain in the ass in the early/mid 90s at the dealership I worked at. Sent out many pumps for this problem, but rarely was it ever fixed.

    I remember Mack coming out with some kind of contraption that mounted to the front of the pump to fix it, but man its been a long time!

    Does yours almost feel like you are bouncing the throttle real fast at that rpm? 

    And usually if the engine had a strain on it, you wouldn't feel it. Only happens when there is steady rpm with little to no strain on the engine.

  3. Hi all. I've got a ch dump I'm working on that has a coughing/stumble mainly noticeable at idle. I have a 33 fault code. My vmac 1 book shows the 33 as injection pump speed sensor. My vmac 2 book doesn't show a 33 at all.

    Now it's been awhile for me since I don't see many of these older trucks anymore. The module in the cab is a vmac 2 module, but the customer has put a different engine in the truck, that's when this issue started. Is it possible that I have the wrong injection pump because of the wrong engine? Would everything plug in the same on 1 vs 2. 

    Like I said, I'm big time out of practice on the older vmacs.

  4. 11 hours ago, fjh said:

    Yup seen it happen a few times ! It even happened when it was a not Swedish owned ! How ever these guys can't really afford  need to piss many more people off,small or big! Volvo/ Mack  market share is dropping like a stone!

    Yup, Volvo sure has trashed Mack in my opinion. I mean, what's really left that is actually Mack? Transmission I guess, some suspension? They have even managed to screw up the diffs. Sad.

  5. On 6/5/2017 at 3:23 PM, Keffer inc said:

    I'm still in Amarillo Tx, Friday they completed the cam, injectors, and dpf. We went for a test drive and it was still missing badly, maybe even worse. At first they were thinking maybe a valve was damaged inside the head. But Saturday a tech decided that it may have been a fault injector that they got. Haven't heard anything yet but I hope that's it. I've been at a hotel for a solid week now.

    Glad it was only the injectors!

    A couple months ago I did a cam on an mp8 with only 200k. 

  6. 2 hours ago, mackcat12 said:

    fjh you are right I talked to the former service manager at my dealership and he said if i was a huge company they would have already replaced my truck no questions asked

    Oh ya, for sure. We do a lot of work for a nationwide garbage company. When we have issues, they make one call to Mack corporate and things happen. I feel bad for the small guys.

  7. Wow. Just catching up on this thread, what a mess!

    When they replaced the engine, I assume it was just a basic that required all of your external components to be swapped to the new (reman I'm sure) engine? So you've still got the same egr cooler/turbo and all that?

    Theres a guy around here that back in the 90s had several trucks, they had braking issues. At the time I worked at the dealership and this guy fought this problem for probably a year as we threw every valve, shoe, drums, whatever Mack told us to throw at it we did.

    Never did fix the problem and Mack refused to give the guy new trucks. These were cl's. He ended up suing Mack over it, I don't think he got squat.

    The 2 trucks he was having the problem with he parked in a barn while the lawsuit was ongoing, several years.

    He never bought another Mack. And this is when they were solid trucks, not Volvos with a dog on the hood.

    Good luck to you man!

    • Like 1

  8. 12 hours ago, Mack Technician said:

    The 8888.... number at bottom of screen is a bag with replacement swag bits. If you see VOE on the box that is a “Volvo Original Equipment” number. That means it was cheaper to buy from Volvo. If you want the numbers Grab it since I have to erase pics soon, too little storage left. If you give Mack the Volvo number of any of these their system will automatically supersede to a Mack #. 

    Thank you!

  9. 3 hours ago, Mackpro said:

    Only saw a few of the stainless cup tips break off. Saw lots of the copper cup tip break off when using the newer style puller. Lucky we held onto the old style tool that taps threads into the cup tip and then uses a pulller that threads into the cup . 

    And don't get lazy when tapping the copper sleeve and not go all the way thru. Ask me how I know. Had to pull the head for that mistake.

  10. On 8/17/2018 at 6:04 PM, Mackpro said:

    Actually there are 3 install tools. One for stainless cups, one for the early stepped bottom copper cups and one for the standard flat bottom copper cups. 

    Do you have the part number for the install tool for conicals? I never knew they had one other than the pull thru. Is the push thru easier to use?

  11. 52 minutes ago, fjh said:

    Bro In my opinion,

      you can chase this for ever! If the truck is pulling well and not throwing codes just ignore the idle situation  ! It could be any number of things !  It may even be the ECM  tring to compensate for a minor compression issue! Just be happy your driving a RELIABLE  somewhat old school truck and not a new one!

    Again Just my opinion !

    I agree. Run it.

    As far as testing the eup, sometimes you can lay a couple fingers in the injection line and feel the pulse, some may feel stronger/weaker. If you have one that feels noticeably weaker, that could be your problem, but if you're not sure then I would live with it myself.

  12. Ok fixed it. I am no longer a fan of working on an engine that has had the aftertreatment deleted.

    I had no check engine light, I was checking for codes in guided diagnostics add I always do. Well since this is us10 emissions, I took a quick look at the faults in the test section and was showing an active fault for coolant level. I fiddled with the sensor connection and now that's all good.

    I don't know anything about the software they program these things with when they delete them, but apparently it's whacky.

    Ok next problem (which ain't gonna be my problem) there isn't anywhere in ptt to program the injector trim codes as I always do. The truck runs fine, but has a little haze to the exhaust. Like I said, it's not my problem. If he wants the codes put in I guess he will have to take it to whoever deleted it.

    Anyway thanks for the help guys.

  13. On 5/15/2019 at 11:30 PM, terantrucking93 said:


    I have one more question my lines for my a/c they freezing up I blow my condensor it’s clean from the outside I know it has a filter but any body can get me a location

    Sent from my iPhone using Tapatalk


    Filter should be right next to the evap, behind the center panel. Is your ac compressor cycling? If not could be a bad thermostat. Also make sure it has the correct charge amount.

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