[1Gary]

Originally Posted by 4 Jaw Chuck

Why not just replace the valve, a 1994 engine would need one by now...they don't last forever and the sensor that reads the valve position would be worn out. Easy enough to measure the resistance of the sensor with a DVOM if needed but I doubt you will find its any good, those diaphrams that actuate the valve are just a type of synthetic rubber and crack which causes all kinds of issues.

In my experience cleaning them is a waste of time, its almost never the valve itself...its either the sensor or the diaphram. Another option is the junkyard, you never know you could find a recently replaced one on another vehicle...any vehicle with that engine would be a candidate for a swap.

I disagree with you.We have serviced EGR's with a high percentage of carbon chunks stuck in them and no returns using screen gaskets cleaning them.

[lmsport]

Originally Posted by ChevroletSS

Well I guess Ill take myy dash off and put a bulb in it. The dash seems easy to do. Right now the map sensor and egr evap sensor is unplugged and it actually runs like it should but thats the only way I can drive it and I dont want it that way. Its pretty basic under the hood, its just like looking at a carb engine, theres not much to it so I cant see nothing else that could be wrong. There is one pigtail that has been unhooked sinse I have owned this truck and There is nothing to plug it into. It reaches about eight inches. Does anyone know what this plug is.

That might be for a AIR divertor valve. Doe sit have an air pump? Tubes in the exhaust manifolds?