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engin is missing and cutting out no power will not idel
Problem for Chevrolet 1990 K1500
90 chevy k1500 350 tbi fuel problem starts but wont stay running
I have a 90 chevy k1500 350 tbi with a problem! I have traced problem to... after turning on key fuel pump kicks on when u crank it over injectors shoot gas and truck starts! After few seconds injectors stop spraying and truck dies! This can happen many times over and over! Eventually sometimes truck stays running and all is great! I changed ignition module, oil pressure sending unit (which i was told controls gas after vehicle is running) fuel filter, computer, fuel pump relay, I am at a loss now! Hope this helps and hope someone can help me!
Comments:
Oct 21, 2009
- there is no security system on the truck.Oct 21, 2009
- thanx for the help! i am really stuck on this one! thsi weekend im gonna run a hot wire to pump from a switch and manually turn it on to see if its a fuel pump failure or a electrical problem! I dont know what else to try! That is a good point u make though! only wierd thing is the colder it gets outside the more times it has to be started to get it to keep spraying fuel and running!Oct 21, 2009
- ya i wish that was issue! but i dont know what would cause fuel to stop completely after few seconds. Its wierdest problem ive ever encountered! If you think of something else let me know im open to suggestions! Besides five gallons of gas and a road flare haha!Oct 22, 2009
- still have no idea whats wrong please help!!Clarification Request
Posted by thundergod on Oct 21, 2009
Don't forget...the older carbureted engines relied upon closing off the air flow to richen up the mixture in colder weather...on injected engines the system adds more fuel instead. If the computer does not know what the temp is, it won't do that and will either keep the fuel at running temp parameters or will keep it in "cold start" Usually though neither will cause the engine to shut down but will make run really ratty.
Posted by thundergod on Oct 21, 2009
A real "head scratcher"...only thing I can think of is that there may be a poor connection either at the ignition switch or at the pump harness that is breaking down but eventually "spark welds" itself at times just enough to keep it running. Without the benefit of actually being there, the best I can do is guess which may or may not help. good luck though!!
Posted by thundergod on Oct 21, 2009
sounds like a security system that has decided not to function as planned. try re-setting it.
Best Solution
posted on Oct 21, 2009
Been there before!!!! usually it turns out to be something really dumb that makes you say "Why didn't I look at that first???" (either while you are smacking yourself in the head , or, just after!!!!)
Good luck again!!!
If you have not looked here, perhaps something will give you an idea where to look. sometimes having a better understanding of what you are working with will give you an idea!!!
No, I don't give up...I know most of what's here but forgot a lot too...if I remembered everything I've learned id be in the funny farm by now (though I'm always close)
Good luck again!!!
Comments:
Oct 21, 2009
- http://chevythunder.com/fuel%20injection%20troubleshooting%20pg%20a.htmIf you have not looked here, perhaps something will give you an idea where to look. sometimes having a better understanding of what you are working with will give you an idea!!!
No, I don't give up...I know most of what's here but forgot a lot too...if I remembered everything I've learned id be in the funny farm by now (though I'm always close)
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Solution #2
posted on Oct 26, 2009
I have a 94' chevy with tbi and I have replaced the distributor altogether, I was having an issue where the truck seemed like it was starving for fuel, like there was a brick wall in front of it when i was driving and it would start bucking and acting crazy, I finally traced it down to replacing the distributor and it fixed the problem, but before I had replaced that I tried several things like you had, like replacing the ignition module, the pcm, the fuel filter, even checking the fuel pressure,lol.....but little piece of info if you decide to do this go with the better distributor, i bought a reman one and I feel as though I'm not getting enough spark when it get cool out, i'm thinking of taking mine and exchaging it for a better one.
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Solution #3
posted on Oct 25, 2009
Ok, the one thing you didn't change is the pick-up coil in the distributor The ECM relies on a trigger signal from the ditributor, thats made by the pick-up, to close the pump relay and keep the pump running. The oil pressure sender can also operate the pump after it "sees" enough oil pressure, ( about 5psi I think ) thats probably why it will stay running after you start it a few times, you build enough volume/pressure at that switch to cause it to close and run the pump. try a pick-up coil, and you might be home free.
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