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atvoffroad4life

05 king quad 700, hard to start, wont rev up

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i have a 700 king quad with very low miles that was recently given to me, the original owner finally got fed up putting parts on that doesnt fix it. there is a new fuel pump and strainer, has 45psi fuel pressure, has new injector, new temp sensor, stock ecm, stock air filter, stock exhaust, (baffles removed from muffler) new spark plug, (very good spark) sometimes it will rev up for a min then it just dies when u give it any gas, when it will run it runs great, it wont idle when cold, will idle warm, starts a little easier when warm, using a heavy duty car battery that is fully charged and hooked up to a charger, low voltage is not a problem, i know this question is out there already, just trying to find some fresh input. i have been a mechanic my whole life, own my own shop , have never had this much headache from any kind of vehicle before.

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Could be a bad oil pressure sensor, or a bed reverse sensor. It sounds like something is telling the ECM too limit the rpms....or as I call it "limp mode".

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it is not throwing any codes at all. one time when adjusting the throttle position it flashed fi, but, i think i may not have had the sensor plugged in good. snapped the connector on all the way , disconnected the battery for a few, code went away and never came back on, i dont think its going into limp mode. the override button does nothing to help. no codes. almost impossible to crank without using ether or spraying gas in throttle body, everything has been changed on this machine, very low miles on it. never been dogged out, original owner is 63 years old and rarely used it, it just will not put enough fuel out to crank , usually as soon as you touch the throttle it completely stops spraying fuel out of the injector, it will idle sometimes perfect, sometimes just for a few seconds before it shuts down, we have temps bout 100 degrees today and it still wouldnt start cold

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hrmmm....I think I'd start looking @ mechanical problems. It still sounds like something is confusing the Ecm. Possibly a corroded connection or a bad bearing somewhere near a sensor. Over amping the system tells me that it puts the ECM into a default mode. Don't you love electrical bugs? I'll think about this a bit more & repost.( clogged fuel line, air restriction,bad regulator, etc.)

Edited by Mudflap64
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well, i just took the throttle body off again, took it apart, everything was clean, still same problem. has k&n air filter, the entire fuel system is new, all new lines, pump, injector

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every connection and wire on this 4 wheeler has been checked, its never been under water, i have a crazy idea that i doubt will work, but, tomorrow im going to put a honda carb on it, temp fuel tank above it, and just for the hell of it see if it will crank and run, will update the outcome, im bout ready to try anything

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i have a the throttle body and air box off, have a carb and fuel tank ready to go, i do believe i have all the fitting i need to put the carb on , i was unable to actually work on the bike today, might not be able to tomorrow either, i got hurt and spent the day at the hospital today, as long as the meds dont have me looped again tomorrow i will attempt to do away with fuel injection on it, if this does work i will post step by step instructions, parts list, pics, and will answer any questions anyone may have

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ok guys , this is my last post on trying to figure out whats wrong with electronic p.o.s. :aargh: i went ahead today and removed the airfilter box and the throttle body, i replaced it with a carb off of my blown up honda, it fired right up. idled. and revved up, i will put a new post on here with a parts list and instructions on how to do this modification soon

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