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Old January 29th, 2013, 04:04 PM   #21
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The 4.3 will not fire unless the oil pressure sensor tells it it has pressure. If the sensor is bad it will do exactly what you are saying. I had this happen on several of the 4.3 Astrovans at my old work. Just another idea.
Keith, You might be on to something, the oil pressure gauge has been acting funny the past few months, when sitting at a idle it will bounce up and down, once im driving its fine.

Now I need to find it
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Old January 29th, 2013, 04:49 PM   #22
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Pull cap off and crank engine. See if rotor moves in complete circle. You need to check your fuel pressure. Your method is not gonna work. Redneck way is to spray some carb cleaner while cranking. See if it fires. Or beat the fuel tank with a mallet.
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Old January 29th, 2013, 04:55 PM   #23
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Redneck way is to spray some carb cleaner while cranking. See if it fires.
direct into the throttle body or can i just take out the air filter?
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Old January 29th, 2013, 05:01 PM   #24
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Air duct is fine. Be careful sometimes they can backfire.
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Old January 29th, 2013, 05:07 PM   #25
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Make sure u hold the throttle open too
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Old January 29th, 2013, 07:29 PM   #26
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Keith, You might be on to something, the oil pressure gauge has been acting funny the past few months, when sitting at a idle it will bounce up and down, once im driving its fine.

Now I need to find it
It should be at the back of the engine near the distributor. You can trick the computer into thinking it has full oil pressure by taking keyed positive to one of the wires (If I remember right its the blue one) and if thats it, it will fire right up. If that happens, replace sensor and you are golden. If it keeps happening, it actually has an oil pressure issue and you can either fix it right, or jumper it and run it till she goes. Last one I did like that ran two more years before throwing a rod.
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Old January 29th, 2013, 10:26 PM   #27
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It sounds like you have a injector issue. You need to start with a fully charged battery and do some testing of the fuel system. If the spider ( injector) is leaking it will start hard and run rough untill it warms up. It starts hard because the dry intake is flooded with fuel. When it gets cold out they dont start because the fuel pressure has leaked down and the fuel has evaporated from the intake. You might try charging the battery, then cycle the key on and off several times without cranking the engine. After several cycles the fuel system may build enough pressure to start. If it does start check the fuel system leak down and pressure.

You may have some flooded out spark plugs also from trying to start it with a weak battery.
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Old January 30th, 2013, 09:59 AM   #28
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It should be at the back of the engine near the distributor. You can trick the computer into thinking it has full oil pressure by taking keyed positive to one of the wires (If I remember right its the blue one) and if thats it, it will fire right up. If that happens, replace sensor and you are golden. If it keeps happening, it actually has an oil pressure issue and you can either fix it right, or jumper it and run it till she goes. Last one I did like that ran two more years before throwing a rod.
it only has one wire, can i still try this trick?
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Old January 30th, 2013, 02:27 PM   #29
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it only has one wire, can i still try this trick?
Probably, but I'm not 100 percent sure on that.
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