staxx Posted August 29, 2014 Share Posted August 29, 2014 Sorry missed your post , very busy building a Mack race truck . If you replace the TEM sensor , side on injection pump put some silione on the threads and run all the way in and tighten jam nut . When the truck has a rough idle does the rpm tach jump , if so the rpm engine sensor under your starter may be out of adjustment or have clutch debris on end clean replace readjust . bottom out and back out 1 turn. If you have high milage excessive crank shaft end play could be a issue also . The econovance could be issue also this moves timing up with RPM so if not moving timing or moving too slow engine runs rough . Check your wiring for it check for bare spots and were it goes in the back of solinoid they get oil damage there. Good luck hope this helps.. Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-257710 Share on other sites More sharing options...
Mild Thunder Posted August 29, 2014 Author Share Posted August 29, 2014 Thanks staxx. The tach needle does move around a little like it's shakey. I checked the ohms on the tach sensor and it was about 275 ohms. The tem sensor was about 150 ohms. It will idle smooth for a minute, then get shakey. When revving it sometimes it's smooth, sometimes it's missing/stumbling a bit. The truck always started with the whole smokey powerful ecovonance mode in the morning. I noticed today when it started it didn't start like that. Kinda cranked a bit then fired but not with its usual "authority " Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-257720 Share on other sites More sharing options...
staxx Posted August 30, 2014 Share Posted August 30, 2014 The TEM sensor should be 100-500 ohms and rpm 200-300 ohm . pull the rpm sensor out clean and readjust 1turn out. Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-257792 Share on other sites More sharing options...
raindog Posted September 21, 2014 Share Posted September 21, 2014 Mild thunder--Did you get truck fixed? If so, what was it?I've got an E7, 1995 in an RD 688. Seems to be an electronic issue--fuel every where, except coming out of the pump. Noticed at least a dozen or so difficult starts in the previous year where it didn't appear to be getting fuel, but eventually did. Feel certain its a fuel shutoff switch gone from sorta bad to all bad, would be curious to know what you found out. Could you by any chance post a pic of the problem part?Thanks, Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-260559 Share on other sites More sharing options...
raindog Posted September 21, 2014 Share Posted September 21, 2014 just realized I hadn't read this thread all the way thru page two.Can someone help out with the nomenclature--What does TDC stand for? What does TEM stand for?I have a wiring diagram for my E7--it shows an Engine Shutdown Relay. Is this the same as what is being called a fuel shutoff solenoid, and does this have anything to do with the problem that mild thunder was having? Think I've got the same problem. Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-260611 Share on other sites More sharing options...
fjh Posted February 6 Share Posted February 6 On 9/21/2014 at 7:10 AM, raindog said: just realized I hadn't read this thread all the way thru page two. Can someone help out with the nomenclature-- What does TDC stand for? What does TEM stand for? I have a wiring diagram for my E7--it shows an Engine Shutdown Relay. Is this the same as what is being called a fuel shutoff solenoid, and does this have anything to do with the problem that mild thunder was having? Think I've got the same problem. If you suspect the shut down relay swap it with another relay in the batch there remember the one you use so you can replace it ! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-546199 Share on other sites More sharing options...
JoeH Posted February 6 Share Posted February 6 9 hours ago, fjh said: If you suspect the shut down relay swap it with another relay in the batch there remember the one you use so you can replace it ! Someone's being rummaging around in the past.... 🤣 Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-546226 Share on other sites More sharing options...
Joey Mack Posted February 7 Share Posted February 7 UHhh,, this posting is 9 years old guy's.... 🤣 Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-546235 Share on other sites More sharing options...
fjh Posted February 7 Share Posted February 7 13 hours ago, Joey Mack said: UHhh,, this posting is 9 years old guy's.... 🤣 yup noticed after i posted ! 🤣 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36847-1998-e7-wont-start/page/2/#findComment-546245 Share on other sites More sharing options...
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