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Old 02-08-2012, 02:39 PM
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relay switch

I've been told the relay switch may have locked I guest. It's the 95' Chevy
Lumina Van, 3.1. I've put a new Batery, But she runs for a while then shuts -off while running. I don't know where the relay switch is located ,or is it bad or, good. I would appreciate any advice at this time ,Sir.
Thanks in advanced.


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Old 02-08-2012, 05:14 PM
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Well, I cant say I understand what your asking however, the basic place to start would be to check the spark and fuel delivery when the van quits running.Spark is pretty straight forward to check.
You need to put a fuel pressure gauge on and see if the pressure falls off to zero when the symptoms occur.Then also the power to the fuel pump has to be verified to prove it is powering the pump, that way you know if the problem is the pump or the wiring to the pump.
Does the fuel gauge act up also?
That particualer van has the fuel pump wiring, the fuel gauge wiring, and the tank pressure sensor wiring going into one pass through connector in the floor right behind the drivers seat. They are noted for corrosion and could very well be your problem
You can see it under the van , but you have to pull the carpet back inside to get to the latches to uncouple it. Check it out, if it is melted or fuzzy and green chances are that is your problem, otherwise check your fuel pressure and spark also when she quits.
If you have fuel pressure and no spark when she quits , it is pretty likely the CRANK sensor is acting up ( Not to be confused with the CAM sensor)
LA Tech
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