Have a 99 gmc jimmy with 4.3 v6.turns over but wont crank,fuel pumpm comes on but still wont start.pour gas in throttle body and will start as long as you pour in gas.
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All electrical connections must be cleaned when you say won't turn over do you mean the engine cranks and you have power or just a click or nothing at all ? All of us are not there obviously so we all need for you to post in specific terms ok now back to the pssible issue ////after cleaning all the cable connections for the battery the engine ground and the power distribution box cable and bolt lug try to crank the engine if it cranks but no start still exists go back and check the blown fuse you had ? Again what fuel Injectors ,throttle body,fuel pump,fuel pump relay on the same circuit as something else etc.and see if it's still blown again or is the fuse good if it was for the fuel pump check the relay and change it try again if still nothing pour some gas into the throttle body and try to start it if it turns over for thirty seconds and then dies you have a 100% fuel delivery problem if it doesn't run check for spark and check the plugs most likely your fuel pump went
Check for fuel by pouring small amount of clean gas down throttle body and crank engine over. if it starts and runs just for a few seconds you have a fuel delivery problem
i am assuming that this vehicle will not start without the gas poured into the throttle body? If so then there is a fuel dilevery problem which can be coming from injectors that are not firing due to clogged injectors or a malfunctioning injection pulse. or clogged fuel delivery system which is most probaly not the case due to you changing the fuel filter, or a bad fuel pump. you have some testing ahead of you.
hi, check the connections at the ecm,i think it's under pass front seat,i've had a couple of those years loose injector signal at ecm connector,if you have a test light you can unplug injectors and test across terminals ,it's a 12v signal at inj ,if lights flash on both while cranking try plugging in one at a time and see if either sprays, if one does and not the other, you would have a shorted injector
I had the same exact problem. After spending thousands on parts. It finally proved to be the CPI injector assembly. Change that and you're truck will be like a whole new vehicle. Most parts store sell a conversion assembly to MPI injection it's a much better desighn that the CPI. I was going nuts for a year chasing this problem. I hope this helps.
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