Mj12687 Posted April 2, 2013 Share Posted April 2, 2013 Okay you guys were great with the earlier help let see about this. Its a 94 l9000 half way through any gear it starts to buck and lose power and blows some blueish smoke it feels like lose of boost but I cant seem to find any leaks and there is no boost pressure gauge in the truck. Quote Link to comment Share on other sites More sharing options...
Mj12687 Posted April 2, 2013 Author Share Posted April 2, 2013 I know this is a mack forum but you were all so helpful I thought id give it a try Quote Link to comment Share on other sites More sharing options...
smorse54 Posted April 2, 2013 Share Posted April 2, 2013 Check the fuel filter(s), it may be starving for fuel. Steve Quote Link to comment Share on other sites More sharing options...
JTFormula Posted April 3, 2013 Share Posted April 3, 2013 Blue smoke sounds like burning oil, maybe blow by? What engine does it have and how many miles are on it? Quote ~ JT Burkard ~ AKA Sweaty Mackwww.jtresto.com www.wickedreputation.netwww.jonathanthomasmotorcars.com Link to comment Share on other sites More sharing options...
mike69mackman Posted April 3, 2013 Share Posted April 3, 2013 Replace fuel filters and water separator filter if it has one , if that doesn't do it I would start looking at the injector and or transfer pump . I agree its starving for fuel . The only other guess is a turbo problem. Possibly losing boost? Jt it probably has a cat or cummins motor in it. Quote Link to comment Share on other sites More sharing options...
Mj12687 Posted April 3, 2013 Author Share Posted April 3, 2013 It has a cat motor in it im not sure of the miles. I changed the oil and oil filter. I changed one of the fuel filters today the second will be here tomorrow. Changing the one fuel filter made no change I will hope for the best and change the second tomorrow but both appeared fairly new. In neutral the truck will rev and idle properly. Start driving and about halfway through the gear it starts to breakup and wont rev any higher and you have to upshift to get the rpms down to continue accelerating but it has no power because you cant get into the power curve. Quote Link to comment Share on other sites More sharing options...
NoClueJoe66 Posted April 3, 2013 Share Posted April 3, 2013 What size cat motor is in the truck? Quote This message was brought to you by Hargraves Potted Meat Product. Chopped full of "Peckers & Lips" since 1933 - John Boy & Billy Link to comment Share on other sites More sharing options...
Mj12687 Posted April 3, 2013 Author Share Posted April 3, 2013 Does anyone know what this fuel filter setup is and anyway to possibly clean it im getting a new filter for the top of it but im unsure of what to do with the setup. Quote Link to comment Share on other sites More sharing options...
farmer52 Posted April 3, 2013 Share Posted April 3, 2013 Fuel heater? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
Mj12687 Posted April 3, 2013 Author Share Posted April 3, 2013 No theres no wires going to it at all. I believe its some type of fuel filter or water separator but im unsure Quote Link to comment Share on other sites More sharing options...
farmer52 Posted April 3, 2013 Share Posted April 3, 2013 No theres no wires going to it at all. I believe its some type of fuel filter or water separator but im unsureCould be a heater that uses engine coolant...is one set of hoses connected to the engine block? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
felicello122 Posted April 4, 2013 Share Posted April 4, 2013 looks two of those Ilines might be water hoses to heat up the fuel, if it is a mechanical cat the diaphragm in the fuel pump might be bad, also that filter could be sucking air, try hooking the two fuel lines together see if it makes a difference. Quote Link to comment Share on other sites More sharing options...
smorse54 Posted April 4, 2013 Share Posted April 4, 2013 Yea,thats a coolant heated fuel/water seperator.There is a drain on bottom to get rid of the water and crud.Don't open the drain while the engine is running or it will suck the system full of air.Had a few road calls for that.We had these on the early CH Macks.Steve Quote Link to comment Share on other sites More sharing options...
slpwlker Posted April 4, 2013 Share Posted April 4, 2013 Yea,thats a coolant heated fuel/water seperator.There is a drain on bottom to get rid of the water and crud.Don't open the drain while the engine is running or it will suck the system full of air.Had a few road calls for that.We had these on the early CH Macks.SteveDid that once and damn near killed the batteries getting it started. Lesson learned Quote Link to comment Share on other sites More sharing options...
Mj12687 Posted April 4, 2013 Author Share Posted April 4, 2013 It is a 275 hp cat motor. I changed that cheap fram filter on top of that separator and it made a big difference. I opened the valve after driving for a bit with the truck off and nothing came out at all nothing no fuel or water. With the two new filters them truck runs much better but I still feel its not running at 100%. According to the dash the truck has 320k on it. Also the tach cuts in and out would this cause a perfomance issue or is it strictly for the driver. Also when it would start to break up the engine warning light would come on is there a way to pull codes out of this truck. Quote Link to comment Share on other sites More sharing options...
slpwlker Posted April 4, 2013 Share Posted April 4, 2013 That sounds like a small engine for a 94 L9000. Quote Link to comment Share on other sites More sharing options...
Td713001033 Posted April 4, 2013 Share Posted April 4, 2013 your drain valve is pluged . you should get water and fuel out of it . Quote Link to comment Share on other sites More sharing options...
Mj12687 Posted April 5, 2013 Author Share Posted April 5, 2013 The plate on the motor is a little tough to read but I believe thats what it says. I have the complete vin if that helps. Ill have to mess with the valve and see if I can get it cleared. The truck is a 12 speed 6 wheel short bed Quote Link to comment Share on other sites More sharing options...
farmer52 Posted April 5, 2013 Share Posted April 5, 2013 That sounds like a small engine for a 94 L9000.Might be a 3306 but I don't think they were available in a L9000. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
slpwlker Posted April 5, 2013 Share Posted April 5, 2013 Might be a 3306 but I don't think they were available in a L9000.yeah but that would be what a 300. Was thinking more along the lines of a 350 to 425 Quote Link to comment Share on other sites More sharing options...
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