Robert Peterson Posted November 22, 2014 Share Posted November 22, 2014 (edited) I drive a 99 RD with an E7 400 with a 8 speed behind it, since it got cold the engine does some strange things. When running up through the gears sometimes it will only rev to about 1700 then the torque falls off badly or it will start to "hunt" for lack of a better term, or if I stay in it sometimes all of a sudden the power and torque will come back. It seems when the outside air warms up later in the day it will run alright. I'm leaning toward a bad boost sensor, but not sure, can I get some help on this problem. I do not think it is a fuel problem because I don't think the air temp would affect that. Edited November 22, 2014 by pres41 Quote Link to comment https://www.bigmacktrucks.com/topic/37811-99-e7-problems/ Share on other sites More sharing options...
theakerstwo Posted November 22, 2014 Share Posted November 22, 2014 That's the way I run until I warm up I amt good for nothen. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/37811-99-e7-problems/#findComment-267573 Share on other sites More sharing options...
hatcity Posted November 22, 2014 Share Posted November 22, 2014 what kind of temps are you talking about? May have some water in the fuel. Freezes at 32 and is slightly blocking fuel system.Are you putting any additive in, especially now. I use Diesel Service stuff. Have heard good about Howe'sBetween the air temp up, and the heat from fuel return, yes it will run better. Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/37811-99-e7-problems/#findComment-267575 Share on other sites More sharing options...
Robert Peterson Posted November 22, 2014 Author Share Posted November 22, 2014 The truck has a fuel water separator and I have run additive in the truck and seems to make no difference.what kind of temps are you talking about? May have some water in the fuel. Freezes at 32 and is slightly blocking fuel system.Are you putting any additive in, especially now. I use Diesel Service stuff. Have heard good about Howe'sBetween the air temp up, and the heat from fuel return, yes it will run better. Quote Link to comment https://www.bigmacktrucks.com/topic/37811-99-e7-problems/#findComment-267591 Share on other sites More sharing options...
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