Zeuz Posted May 23 Author Share Posted May 23 On 5/22/2024 at 12:11 PM, Joey Mack said: Has anyone tried to see of power goes to the celenoid while someone trys to start it? The starter has the two selonoid the big one on starter and smaller one on top.the two wires on smaller selonoid are hot,if you jump it with a ground the engine turns over but won't start. You think it might be a safety issue or sensor? Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552380 Share on other sites More sharing options...
JoeH Posted May 23 Share Posted May 23 (edited) The two hot wires threw me for a loop when we were getting a spare engine running in a parts truck we bought. It uses a switched ground to run the solenoid. So both sides will test hot, but the power can't travel til you supply a sufficient ground. Edited May 23 by JoeH Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552386 Share on other sites More sharing options...
Zeuz Posted May 24 Author Share Posted May 24 3 hours ago, JoeH said: The two hot wires threw me for a loop when we were getting a spare engine running in a parts truck we bought. It uses a switched ground to run the solenoid. So both sides will test hot, but the power can't travel til you supply a sufficient ground. The ECM is the one that sends the ground? Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552400 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 IDK, I ran into this on a 2000 or 2003 e7. Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552405 Share on other sites More sharing options...
Joey Mack Posted May 24 Share Posted May 24 The Volvo Macks eont start if there are some faults, especialy if it has an M Drive transmission. Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552423 Share on other sites More sharing options...
Zeuz Posted May 24 Author Share Posted May 24 10 hours ago, Joey Mack said: The Volvo Macks eont start if there are some faults, especialy if it has an M Drive transmission. It has a 10 speed My last resort is going to be putting all new sensor and wire harness .if it still don't work I'm going to just keep it for parts .I had the engine rebuilt last year .wire harness is 1600 at the Mack Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552471 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 Dumb question, are your starter cables and wires tight? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552475 Share on other sites More sharing options...
Joey Mack Posted May 24 Share Posted May 24 Oh my.... I wish i could remember how i did that 09'.... I had it set so with the key on i could push the start button and it fired up.. Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552476 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 It would be nice to know what fault codes the truck has.... Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552477 Share on other sites More sharing options...
JoeH Posted May 24 Share Posted May 24 And is this truck deleted identically to the other trucks? Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552480 Share on other sites More sharing options...
Zeuz Posted May 25 Author Share Posted May 25 3 hours ago, Joey Mack said: Oh my.... I wish i could remember how i did that 09'.... I had it set so with the key on i could push the start button and it fired up.. I want to put one but they tell me I can't by pass the ecm Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552503 Share on other sites More sharing options...
Zeuz Posted May 25 Author Share Posted May 25 3 hours ago, JoeH said: It would be nice to know what fault codes the truck has.... Mack dealer said the ecm and cluster where bad .but wouldn't work on it cause deleted I put new ecm ,cluster ,starter worked fine for 2 days ,no codes is what mechanic said ,but he said the ecm is fried too didn't even drive it a mile with the ecm, I'm picking it up Tuesday and just going to park it . Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552504 Share on other sites More sharing options...
Joey Mack Posted May 25 Share Posted May 25 I am So sorry... I dont have a clue, on how to help you... Quote Link to comment https://www.bigmacktrucks.com/topic/74174-mp8-wont-start/page/2/#findComment-552505 Share on other sites More sharing options...
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