Welcome to the forums. Joined Jan ... Make sure the baffle in the silencer isn't broken. When I am running 1,500 rpm and mash it, the engine drops to a constant 1,000 rpm. Hello all, I got a 2005 Freightliner M2 with a C7 in her. Registered. Currently, I am driving a Cascadia. My 01 freightliner car carrier with a cat engine will not go over 45 mph. i have a 86 w150 4x4 with a 6 in lift and 38 super swampers i just put a 4 barrel carburetor and a holly high rise in take. If I go up a hill, my car will accelerate and drive normally then. It drives well but when I try to accelerate over 30mph it won't accerelate but my rpms go all the way up. Only code im getting is for Low coolant level. befor i put the carb on it had now power and it wouldnt go over 45. one of my buddys thought the carb i had on it didnt have enuf to muve it so i got the 4 barrel and the high rise but. Discussion Starter • #1 • May 18, 2012. Freightliner Won't Go Over 45mpg. I have to let it idle and then ease into it again to get it up to 1,500 again. All servers allow speeds faster than 55 mph, so the only chances your truck is going that speed are: In gameplay settings, you have the speed limiter activated. It won't rev past 1,500 and then only at half throttle. Today my truck left me on the shoulder driving 8-10 MPH. I need some help as I am out of things to check/fix. I couldn't get one of my sleds to go over 35mph and it ended up being restricted air flow due to a broken baffle. If you can continue to increase engine speed once you reach 45 MPH but the vehicle won’t actually go faster than 45 MPH, there could be a hydraulic fault in the transmission, a low transmission fluid level, slipping bands or clutches, a torque converter defect and so forth. Freightliners CE lights go on and off all the time. Check if any of these applies to your problem. It seems to be the nature of the beast. Hello everyone. I don't understand why it will accelerate normally when I go up a hill, and after I go up the hill it drives just fine. My problem is that the truck wont go over 40-45 mph and after alittle while at the high rpm my check engine light and engine protection like come on. You're driving WoT external contracts, they are limited to 55 mph (90 Km/h) no matter what server you logged in. I have learned over the past few weeks that the Coolant Level has to be at the upper end of the range of the Max Cool and Min Cool level. Discussion Starter • #1 • Oct 27, 2012 (Edited) Lately ive been having problems with power on my truck, mostly in second gear under load. 30 Posts . When I start my car it is on 1 rpm. 155 Posts . My 01 freightliner car carrier with a cat engine will not go over 45 mph. Having said that, I have driven many Freightliners over the years. Freightliner won't go over 45mpg 6 Answers. 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