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post #1 of 3 (permalink) Old 01-28-11, 01:12 AM Thread Starter
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96 Aerostar - Vacuum Purge Valve?

Error code said purge valve. Mechanic said this valve is relevant only to the evaporate emissions system and does not effect the way the engine runs/performs. Is that correct?

This good old truck runs like silk. But it likes gas... There was a time when it did a lot better on gas. I just did plugs + wires + fuel filter + air filter - always keep up on the maintenance. It has a new timing chain, for example...

I'm getting only about 20 mpg. It used to do LOTS better than that. If the vacuum purge valve effects engine vacuum well, that could be the problem!

Any help appreciated?
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post #2 of 3 (permalink) Old 01-28-11, 10:25 AM
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post #3 of 3 (permalink) Old 02-15-11, 10:44 AM
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Re: 96 Aerostar - Vacuum Purge Valve?

Having fought with my 96 Aerostar emissions and having the Purge Vlave and Sensor a large part of the struggle, I can tell you if this valve is stuck open or the vac lines connecting it are cracked you will get a very significant amount of raw/unmetered air into the intake. If the lines are cracked the circuit won't show pressure change and the sensor will not "sense" and the code will pop. If the valve is bad, then the same result will happen; system triggers valve, no valve action, no pressure change, no sensor trip, CODE pops. When it works properly with hoses intack, valve and sensor known good, the system triggers the valve, the valve opens letting engine vacuum draw the purge lines down, the sensor senses this and confirms to the computer that it is working.

The purge vac circuit is fed with a primary connection right into the throttle body behind the butterfly. The valve and sensor are not that expensive and fairly easy to change. The sensor might have to come from the dealer but mine was only about $15 and the valve was about $12 from the local parts man. You will have to pull the air cleaner box to get to the lines, but there is plenty of room down there to work. Just make sure you keep the connectors and stuff sorted when you disassemble. The little hoses are pre-bent for location/clearance.

Hope this helps...

Martin from PDX
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