TrashMan08 Posted yesterday at 04:23 AM Share Posted yesterday at 04:23 AM Hello everyone, thanks in advance for any help/responses. I really dont know where to start looking for problem. 2000 e7 350hp rolloff. Im the owner operator. Truck runs terrible until around 80 dgrees or so outside. No lighting bolt on, starts instantly at any temperature, i.e. engine temp, or outside air temp. Looked for leaks everywhere, did injector cutout test, installed new cam sensor and speedo sensor. Also Installed a boost gauge, wont go over 18 lbs loaded . Over 80 degrees, 25lbs of boost nice black smoke on up shifts, blows my hat off. Do these engines have IAT or Boost sensors that may be causing this. Forgot to mention she idled rough all winter, but when warmer outside she also idles smoother. Thanks again for any help, great truck on nice days! lol Quote Link to comment https://www.bigmacktrucks.com/topic/76572-2000-rd-e7-etech-no-power-until-80-degrees-outside/ Share on other sites More sharing options...
Joey Mack Posted 21 hours ago Share Posted 21 hours ago look at the bottom of the radiator frame for an ambient air temp sensor. No boost sensor in that era. inspect the fuse box under the hood below the windshield, make sure all fuses are tight, fuse 40 is the EECU fuse. check the condition of the EECU plugs. Check the wires behind the EUP's to see if the insulation is cracking. I will post the procedure for a 9-2 code. it covers how to check the ground connections. do this before you open your wallet again. Jojo 9-2 code.pdf 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76572-2000-rd-e7-etech-no-power-until-80-degrees-outside/#findComment-594552 Share on other sites More sharing options...
TrashMan08 Posted 14 hours ago Author Share Posted 14 hours ago ok. I looked for ambient sensor, no luck, i dont think she has one. I will do inspection of fuse box and injector wires. Thanks for your help, i give an update asap 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76572-2000-rd-e7-etech-no-power-until-80-degrees-outside/#findComment-594581 Share on other sites More sharing options...
Joey Mack Posted 14 hours ago Share Posted 14 hours ago Were you able to open the pdf i posted for you? The AAT wires are probably there, just rolled up and tied back to the engine harness. It may also not be turned on in the program. Quote Link to comment https://www.bigmacktrucks.com/topic/76572-2000-rd-e7-etech-no-power-until-80-degrees-outside/#findComment-594582 Share on other sites More sharing options...
TrashMan08 Posted 11 hours ago Author Share Posted 11 hours ago yes, i did download and looks very helpful thank you, will definitely look through harness again maybe under a mile of electric tape somewhere. I would think that the engine bay gets warm enough to run better, it almost feels like derating fuel, power would drop off around 1500rpm. Today was upper 80s and she was running unbelievable, it literally feels like a 100 hp difference. i dont know, will check fuses and wiring also. Thanks so much great help Quote Link to comment https://www.bigmacktrucks.com/topic/76572-2000-rd-e7-etech-no-power-until-80-degrees-outside/#findComment-594604 Share on other sites More sharing options...
Joey Mack Posted 3 hours ago Share Posted 3 hours ago Do you have a fuel pressure gauge on a long hose that reaches the cab? I made one. I used it during test drives. Quote Link to comment https://www.bigmacktrucks.com/topic/76572-2000-rd-e7-etech-no-power-until-80-degrees-outside/#findComment-594610 Share on other sites More sharing options...
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