94 22re starts than dies when key let off
07-20-2010, 07:12 PM
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94 22re starts than dies when key let off
A buddy of mine has a 94 22re 2wd pickup. It has about 99k miles, and from our recollection never had the fuel filter changed. The problem is that he turns the key like he would go to start it and it runs. But then shuts off when he lets off of the key. But if he holds the key it will continue to run. I am pointing finger towards ignition switch but just wanted to double check my guess work! If you dont think ignition switch where would you start?
07-20-2010, 10:20 PM
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sounds like the air flow meter, there is a switch inside it that closes when the engine is started, the switch controls fuel pump operation, see if u can swap in a known good afm.
07-20-2010, 11:20 PM
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no thats on a seperate circuit that energizes the fuel pump when cranking, as soon as u stop cranking that circuit is hut off, and the afm circuit keeps the fuel pump running once the engine starts
07-21-2010, 08:20 PM
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Checked the AFM and its fine, check all the fuses and everytthing all that works then I jumped the fuel pump on the box in the right fender and the truck stayed running. Sooooo what now?
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07-21-2010, 08:41 PM
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Yeah that's a very good possibilty also, but the left side of my brain also says sense I can jump the pump the wires are good because when I jump it it stays running. So this is pointing to ignition switch is bad because it sends constent power to the pump after the truck is started, correct? Hell ill take any suggestions I also checked codes and I had 2431 I believe chilton said something about intake air temp sensor or something and the other is air flow meter signal..
07-21-2010, 08:56 PM
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Try the fuel pump test jumper:
- http://www.4crawler.com/4x4/CheapTri...shtml#FuelPump
- http://www.4crawler.com/4x4/CheapTri...shtml#FuelPump
07-21-2010, 09:01 PM
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the green and yellow wire to the afm controls the ground circuit to the circuit opening relay, with the vehicle running chack to see if that wire is grounded, do u have a voltmeter?
07-21-2010, 09:03 PM
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Yes I do, but using it is a whole different story!! Just kidding if you can help me and tell me how to check it I will be able to figure it out for the most part and then report back!
07-21-2010, 09:07 PM
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well even if u have a test light, connect one side of the test light to battery power and then backprobe the green and yellow wire at the afm while its plugged in and running, tell me if it lights up
