olegreen Posted 2 hours ago Share Posted 2 hours ago First I would like thank everyone with help in the past. Ive been reading these forums for years with a lot of helpful information. Ive got a high rpm miss that I cant figure out and was wondering if anyone could help me out. First, I just replaced the cam, injectors, eup's and thats when I started to get the miss. Ive also changed both cam and crank sensors, fuel filters a few times and the ground bolt on the block has been cleaned. There is no lights on and it works because I had a 8-3 code when I changed the unit pumps. The miss only happens around 1700-1800 rpms, good below and above that range. Also the fuel pump has been changed to. Any help will be greatly appreciated. I really think Ive got a bad rebuilt bosch unit pump but at this point not sure. Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/ Share on other sites More sharing options...
fjh Posted 1 hour ago Share Posted 1 hour ago You can’t rule out a bad injector ! If it’s not throwing a code! just saying! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594694 Share on other sites More sharing options...
olegreen Posted 1 hour ago Author Share Posted 1 hour ago The miss didnt happen until I replaced the last 4 eup's. I had 2 I installed, then the dealer had to order the last 4. Truck ran really good until I installed the last 4 eup's. Bad thing is it runs really good in every gear besides 10th, thats the only gear I can make it miss. It will pull all the way to 2000 rpms in all other gears. Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594695 Share on other sites More sharing options...
Joey Mack Posted 1 hour ago Share Posted 1 hour ago What year truck and model ? Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594696 Share on other sites More sharing options...
olegreen Posted 1 hour ago Author Share Posted 1 hour ago (edited) 98 Ch 613 maxi cruise. The engine is a 2000 rated at 350 horse power, if that matters. Edited 1 hour ago by olegreen Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594697 Share on other sites More sharing options...
fjh Posted 56 minutes ago Share Posted 56 minutes ago You could try installing the cal codes ! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594698 Share on other sites More sharing options...
Joey Mack Posted 49 minutes ago Share Posted 49 minutes ago Did you inspect the EUP wires right behind them for cracks in the insulation? The wires are very strong, but the insulation will crack with age. Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594700 Share on other sites More sharing options...
olegreen Posted 46 minutes ago Author Share Posted 46 minutes ago Dont guess I know anything about installing any cal codes. Also cylinder one had a bad spot on the wire from rubbing on the block, but all other wires seemed to be good. Also with the key on checked with a volt meter. Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594701 Share on other sites More sharing options...
Joey Mack Posted 44 minutes ago Share Posted 44 minutes ago I think the EUP terminals are in the J-2 plug on the EECU. Do you have a pin-out diagram? I know I posted it at some point.. Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594702 Share on other sites More sharing options...
olegreen Posted 37 minutes ago Author Share Posted 37 minutes ago No I do not have any wiring diagrams for the truck. Plus, back to the cal codes I didnt think you had to recalibrate a new eup. Its going to be hard to get this to duplicate since it only does it in high gear and high rpms. Ive got another eup coming and going to try to change them out one at a time to see if there is any changes. Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594703 Share on other sites More sharing options...
Joey Mack Posted 26 minutes ago Share Posted 26 minutes ago You can move #3 to another hole and see if the code follows it. Quote Link to comment https://www.bigmacktrucks.com/topic/76579-e7-etech-high-rpm-miss/#findComment-594706 Share on other sites More sharing options...
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