farmer52 Posted November 6, 2014 Share Posted November 6, 2014 Have you changed fuel filters? Checked for fuel line restrictions? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
macksmoke Posted November 6, 2014 Author Share Posted November 6, 2014 The air and fuel filters were changed last fall, it didn't get better after that either. I'm going to start checking fuel lines for restrictions. Also I want to check the pump timing! I really need to fix this! It's my plow truck this year and most of my route is hills. This truck has a 10ft plow, 10ft wing and a 10 yrd sander. Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 6, 2014 Author Share Posted November 6, 2014 Why would it run worse when I disconnect the puffer? Quote Link to comment Share on other sites More sharing options...
MACKS Posted November 6, 2014 Share Posted November 6, 2014 check out the easy stuff first,fuel lines or lift pump,keep in mind just a pin hole air leak in one of the fuel lines could starve the engine for fuel..good luck Quote Link to comment Share on other sites More sharing options...
MACKS Posted November 6, 2014 Share Posted November 6, 2014 eWhy would it run worse when I disconnect the puffer?you need the air pressure to go to the puffer,by disconnecting that line the puffer wont let the rack open,as the turbo builds air pressure in the manafold it goes to the puffer valve and lets the rack in the pump open,in other words to by pass this type of puffer you would need air pressure going to it all the time. Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 6, 2014 Author Share Posted November 6, 2014 On the back of the puffer there's a screw that I backed out, now it's even worse! If I put a longer screw in there to hold the puffer open do you think that'll work? Quote Link to comment Share on other sites More sharing options...
MACKS Posted November 6, 2014 Share Posted November 6, 2014 On the back of the puffer there's a screw that I backed out, now it's even worse! If I put a longer screw in there to hold the puffer open do you think that'll work?I honestly dont know,i never messed with mine,truck runs great the way it is. Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 6, 2014 Author Share Posted November 6, 2014 I might try taking the spring out. Quote Link to comment Share on other sites More sharing options...
Kansas farmer Posted November 6, 2014 Share Posted November 6, 2014 I'm no expert but I think you might have seperate problems. When you say you can't get it rolling from a stop it makes me think trans. May try changing the fluid and filter. As far as the engine problem sounds like a you are losing boost pressure somewhere. What will it build to when it finally builds boost? Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 6, 2014 Author Share Posted November 6, 2014 I don't know what the boost is but it doesn't even try to build. Quote Link to comment Share on other sites More sharing options...
Kansas farmer Posted November 6, 2014 Share Posted November 6, 2014 Does the truck have a charge air cooler? Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 6, 2014 Author Share Posted November 6, 2014 Yes Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 6, 2014 Author Share Posted November 6, 2014 I took the spring out of the puffer and it works great! Thanks so much for all your help! Does anyone know how to turn this up just a little bit? I have a automatic trans so I don't want to go to much! Thanks again! Steve. Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted November 6, 2014 Share Posted November 6, 2014 This sounded like a puff limiter issue......but that's a different style than what I have worked on. Quote Link to comment Share on other sites More sharing options...
Swishy Posted November 6, 2014 Share Posted November 6, 2014 We took our puff limiters out n put a washer as a packer in place B 4 we screwed the puffer back incya§wishy Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted November 6, 2014 Share Posted November 6, 2014 I bought a 1989 e6 350 with a 9 SPD mack. The guy was a pure bred mack guy. He said he messed with the shims in his puffer for a couple weeks to get it perfect for him. That truck barely smoked, built boost pressure perfectly, had a ton of power and got over 8 mpg. Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted November 7, 2014 Share Posted November 7, 2014 That is the way I have mine set and no smoke.A little lazy on take off but it don't hurt the power. Quote glenn akers Link to comment Share on other sites More sharing options...
macksmoke Posted November 7, 2014 Author Share Posted November 7, 2014 I really don't think I have any shims in mine. I have a Bosch 95110112 pump. Can I turn this up a little? Quote Link to comment Share on other sites More sharing options...
bobcotkg Posted November 7, 2014 Share Posted November 7, 2014 If its the one I'm thinkng of, take the puffer off, there will be a fuel plate in there. Slide it ahead for more power.The air diafram was / is probably bad in that puffer, hence taking the spring out fixed it. You can take the plug out of the top and there is a star wheel that you turn with a screw driver (Like a brake adjuster on a car) that basically releases the spring tension. By rights, you can take the puffer off completely and just make a cover to cover the gov. housing...The other style puffers just plug the line going to the pump. Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 7, 2014 Author Share Posted November 7, 2014 It sounds the smae as what I have. There is a plate under the puffer, is that the fuel plate? if I take the puffer out do I get more throttle? Quote Link to comment Share on other sites More sharing options...
bobcotkg Posted November 8, 2014 Share Posted November 8, 2014 That would be the fuel plate. If you took the spring out, dont worry about taking it off. To get more RPM, first be sure the throttle lever is opening all the way, should "cam over". After that there is a throttle stop on the pump the throttle arm hits. Have to disable the tamper proofing and then turn the screw in a couple turns. Check free RPM. shouldn't go over 2350 / 2400. Quote Link to comment Share on other sites More sharing options...
bobcotkg Posted November 8, 2014 Share Posted November 8, 2014 I'd imagine doing what I told ya, you should be happy. Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 10, 2014 Author Share Posted November 10, 2014 I need to find out what the RPM is. The cable is broke for the tach. I moved the plate forward when I took the spring out and the truck has alot more power at take off but not so much mid to full throttle. Where can I put a electronic RPM meter on this to get a accurite reading? Quote Link to comment Share on other sites More sharing options...
macksmoke Posted November 10, 2014 Author Share Posted November 10, 2014 I'm really worried about increasing the RPM's with the auto trans. that's in it. Quote Link to comment Share on other sites More sharing options...
bobcotkg Posted November 15, 2014 Share Posted November 15, 2014 Check the timing. Could be slow. You'll have to have the fancy tool to do it is all. The gearbox up by the injection pump that runs the tach went bad on mine. Make sure its good before you put a new cable on it. Quote Link to comment Share on other sites More sharing options...
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