Okiki Olufokunbi Posted March 18, 2013 Share Posted March 18, 2013 Hello all,what electrical component controls tells the injector pump to speed up or slow down in order to deliver fuel into the engine. I would think it would be something like the throttle position sensor or a mechanical equivalent on an mechanical pump.I am asking because my E7 is fast revving up and down like crazy on startup, in quite a predictable manner. It ask as if one is depressing and releasing the accelerator, when no one is doing it. And it does not even respond to the accelerator when one is pressing it. So i think the electronic component that controls the injector pump speed has failed, and is cycling between its low and high output.any help will be appreciated.thanks Quote Link to comment https://www.bigmacktrucks.com/topic/30461-injector-pump-output-controller-question-cyclic-engine-rev-issues/ Share on other sites More sharing options...
felicello122 Posted March 18, 2013 Share Posted March 18, 2013 Could be the pedal control ,i don't know the year,but i had a 94 e7 and the ecovance control went bad and it was doing similar things. Quote Link to comment https://www.bigmacktrucks.com/topic/30461-injector-pump-output-controller-question-cyclic-engine-rev-issues/#findComment-172886 Share on other sites More sharing options...
Dennis Hall Posted March 18, 2013 Share Posted March 18, 2013 My 02 E7 350 somewhat did this when the throttle pedal went. If you put slight pressure on the pedal as it was revving it would calm back down, let up pressure it would race again. Quote Link to comment https://www.bigmacktrucks.com/topic/30461-injector-pump-output-controller-question-cyclic-engine-rev-issues/#findComment-172958 Share on other sites More sharing options...
staxx Posted March 18, 2013 Share Posted March 18, 2013 Need to start with what year and engine you have etec or e7 ? Quote Link to comment https://www.bigmacktrucks.com/topic/30461-injector-pump-output-controller-question-cyclic-engine-rev-issues/#findComment-172963 Share on other sites More sharing options...
Okiki Olufokunbi Posted March 19, 2013 Author Share Posted March 19, 2013 sorry l left out the details. 1993 CH613 with E7 electronic fuel injection pump. Well I found that the ECM is fried, and it appears that the electronic governor side of the injection pump has been messed up too.. The new ECM is not able to supply enough power to get the pump going. Quote Link to comment https://www.bigmacktrucks.com/topic/30461-injector-pump-output-controller-question-cyclic-engine-rev-issues/#findComment-173038 Share on other sites More sharing options...
Okiki Olufokunbi Posted March 23, 2013 Author Share Posted March 23, 2013 hello,i just wanted to inform of the resolution. the ecm was not fried after all, and the electric governor is ok. there was a grounding issue that happened when wires around the air compressor were reconnected after re-installing the compressor. it caused the cyclic revving, and we did not quite figure out why the second ecm did not worktwas quite a painful education, but we keep learning.thanks Quote Link to comment https://www.bigmacktrucks.com/topic/30461-injector-pump-output-controller-question-cyclic-engine-rev-issues/#findComment-173793 Share on other sites More sharing options...
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