lakewood Posted April 19, 2017 Share Posted April 19, 2017 So I have sister trucks. Bought them from gramercy demo our of Manhatten. Both rigs have 45k miles (I know right!) But over 25k in hours. My 94 runs like she is brand new but my 95 is a bit sluggish. I don't know how to fix this problem. The 95 runs great when cold but once she heats up I pretty much have to drop down to 2nd when climbing a grade the other one would take in 3rd he'll even 4th. Also hear a sputtering sound? Any help would be greatly appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/ Share on other sites More sharing options...
fjh Posted April 19, 2017 Share Posted April 19, 2017 What horse power are these units!? you could be having problems with fuel pressure or the timing advance if these a electric engines! Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-367822 Share on other sites More sharing options...
lakewood Posted April 19, 2017 Author Share Posted April 19, 2017 E7 300 mack Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-367852 Share on other sites More sharing options...
luke andres Posted April 21, 2017 Share Posted April 21, 2017 e7 or em7 what transmissions my 91 dm has an air line going to the bosch fuel pump and with it not having air to it it doesn't pull a hill worth a darn. Found this out when I switched to a fuller 8ll and didn't have the air line hooked up Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-368016 Share on other sites More sharing options...
TeamsterGrrrl Posted April 21, 2017 Share Posted April 21, 2017 That air line is probably for a "Maximizer" road speed governor that limited speed to 55 in top gear. You didn't need to change transmissions, just disable that stupid governor. Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-368022 Share on other sites More sharing options...
lakewood Posted April 21, 2017 Author Share Posted April 21, 2017 I don't have the governor on. Now that it is light I see burn marks on my turbo and the pipeople going to my turbo. I also see oil on one of my lines going f49m injector pump into engine block. Again I'm new to the trucking industry as well as to diesel engines Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-368029 Share on other sites More sharing options...
lakewood Posted April 21, 2017 Author Share Posted April 21, 2017 4 hours ago, luke andres said: e7 or em7 what transmissions my 91 dm has an air line going to the bosch fuel pump and with it not having air to it it doesn't pull a hill worth a shit found this out when I switched to a fuller 8ll and didn't have the air line hooked up When I start her up now she just pours black grey smoke also more oil on top of motor where breather cap is and 9ne l8ne from 8njector pump has oil on it where 8t go8ng into motor Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-368030 Share on other sites More sharing options...
lakewood Posted April 21, 2017 Author Share Posted April 21, 2017 4 hours ago, luke andres said: e7 or em7 what transmissions my 91 dm has an air line going to the bosch fuel pump and with it not having air to it it doesn't pull a hill worth a shit found this out when I switched to a fuller 8ll and didn't have the air line hooked up Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-368032 Share on other sites More sharing options...
lakewood Posted April 21, 2017 Author Share Posted April 21, 2017 When started it idles terrible and when I give it Amy throttle it wants to stall. Silly question but it possible that the air cleaner is doing this? Quote Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-368033 Share on other sites More sharing options...
theakerstwo Posted April 22, 2017 Share Posted April 22, 2017 Air cleaner would be easy to check if you can find it. 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/49590-help-95-and-94-mack-dm/#findComment-368077 Share on other sites More sharing options...
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