Joe2007 Posted yesterday at 02:58 AM Share Posted yesterday at 02:58 AM Hey guys I have a 1990 Mack ch600 with a E7-300 I drive the truck just about everyday. I’ve started have some trouble with it but can’t figure it out. It starts and runs good not smoking out anything. The trouble I’m having is it’s got no power. Same routs everyday the hills I was climbing at 30mph I’m now climbing around 18 or 19mph and it’s the same way loaded or unloaded. Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/ Share on other sites More sharing options...
Joey Mack Posted 17 hours ago Share Posted 17 hours ago Fuel filters? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578251 Share on other sites More sharing options...
Joe2007 Posted 14 hours ago Author Share Posted 14 hours ago I changed both of them. Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578252 Share on other sites More sharing options...
mechohaulic Posted 13 hours ago Share Posted 13 hours ago fuel tank vent clogged creating vacuum / flex line in suction side has internal split line restricting flow? one tank or two? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578256 Share on other sites More sharing options...
fjh Posted 13 hours ago Share Posted 13 hours ago 11 hours ago, Joe2007 said: Hey guys I have a 1990 Mack ch600 with a E7-300 I drive the truck just about everyday. I’ve started have some trouble with it but can’t figure it out. It starts and runs good not smoking out anything. The trouble I’m having is it’s got no power. Same routs everyday the hills I was climbing at 30mph I’m now climbing around 18 or 19mph and it’s the same way loaded or unloaded. what trans do you have and do you have any fault lights ? If no faults and If You have a Mack trans >try disconnecting the torque limit switch on the rear of the trans Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578257 Share on other sites More sharing options...
terry Posted 13 hours ago Share Posted 13 hours ago Loosing boost somewhere? terry Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578258 Share on other sites More sharing options...
fjh Posted 13 hours ago Share Posted 13 hours ago 1 minute ago, terry said: Loosing boost somewhere? terry Terry ! runs good not smoking out anything 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578259 Share on other sites More sharing options...
Joe2007 Posted 11 hours ago Author Share Posted 11 hours ago No faults. 10 speed. It’s got 2 110 gal tanks. But I have one of them turned off have not used it for a couple years. Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578267 Share on other sites More sharing options...
fjh Posted 10 hours ago Share Posted 10 hours ago 37 minutes ago, Joe2007 said: No faults. 10 speed. It’s got 2 110 gal tanks. But I have one of them turned off have not used it for a couple years. Sorry just noticed year is it vmac ? If not check throttle lever for going full on and stop for full on! Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578271 Share on other sites More sharing options...
Joe2007 Posted 7 hours ago Author Share Posted 7 hours ago What are you talking about Vmac? Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578280 Share on other sites More sharing options...
fjh Posted 7 hours ago Share Posted 7 hours ago Electric fuel pump! Likley not because of the year! That said the lda ont the top rear may be at issue here! Let us know! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578283 Share on other sites More sharing options...
JoeH Posted 5 hours ago Share Posted 5 hours ago 7 hours ago, fjh said: Terry ! runs good not smoking out anything Check boost, could have a crack in the Charge Air Cooler. My '95 e7-350 was a whole different engine when we replaced our cracked CAC. Went from 22psi to peaking around 34 psi under certain conditions. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578292 Share on other sites More sharing options...
Joe2007 Posted 4 hours ago Author Share Posted 4 hours ago What’s the best way to check for boost leaks? Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578293 Share on other sites More sharing options...
fjh Posted 4 hours ago Share Posted 4 hours ago 4 minutes ago, Joe2007 said: What’s the best way to check for boost leaks? If. You don’t have smoke most likely a fuel issue just sayin Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578294 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago Some, on here have made pressure testers with PVC parts. If you do that, keep in mind that when you get near 10 psi, these home made tools can pop off with a vengeance. So build it smartly. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578295 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChsSEwi33eflmZqOAxXENggFHZ74B_kYACICCAEQIBoCbWQ&co=1&gclid=Cj0KCQjw64jDBhDXARIsABkk8J5pZuKDpgTeenxDmarE-L3O9LxHZdQp20D5JsrUALy4EhfFWHue3GsaAjjfEALw_wcB&sph=&ohost=www.google.com&cid=CAESwwHg9oUHqV36uRgSbbvkbz72M298ShJHG6glAhlB2DjLhlV346HFyHELH3S57AH-duG7SDnYsKL4gj0yOs1JiPiyoIak7aemnZkFjfdpuUm3KGxRWRAfchUt_6vrk9eRZ6EQN8Q0YC3vSQpjmtorPahrV-nG8Epg864ofPlSW6fktY0NIL1hU33jHc0A7KLASjlAVkubZFnUxG9ODW-6d4wOG4VUgje7XanFgMHdajWtbBlWM0l00Ndk8L5dFEFrO55P7O0&category=acrcp_v1_41&sig=AOD64_22SWCMH_4znJO98E2Gu73cxEunzQ&ctype=5&q=&ved=2ahUKEwizqeHlmZqOAxVYq4kEHfOOG7kQwg8oAHoECAoQHw&adurl= Here is a sample of a pressure tester. I have a Pro Set, but this may be good enough for you, and be a good addition to the tool box. There are many other choices.... Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578296 Share on other sites More sharing options...
fjh Posted 4 hours ago Share Posted 4 hours ago (edited) 1 hour ago, Joey Mack said: Some, on here have made pressure testers with PVC parts. If you do that, keep in mind that when you get near 10 psi, these home made tools can pop off with a vengeance. So build it smartly. Oh ya! 😡 Found a gusher with this setup! By the way this is not my set up how ever he is a member here I have been helping him with his issue in this case lots of smoke lacking boost! Edited 3 hours ago by fjh 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75724-power-problems/#findComment-578298 Share on other sites More sharing options...
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