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AFC question

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Borg Warner solenoid

Interior and Sound deadening Project

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If you're keeping track you'll remember that I recently swapped out the automatic transmission for the five speed manual.
The manual transmission - at least for me anyway - just makes me more aware of the engine's function and performance.

That said, the engine seems pretty flat once it nears 2000 rpm. with a pressure gauge installed I'm only measuring about 6 - 7 psi boost.

Fuel pressure is between 25 - 30 psi at idle - which seems decent to me. I'd love to check the fuel pressure under a load but I'll need a gauge installed for that.

I did a leak-down check - turbo to intake manifold - no soap bubbles found, and even after disconnecting the shop compressor and covering the test fitting with my thumb for 20 seconds or so there is residual pressure in the system.

Now I'm assuming -perhaps incorrectly - that if the AFC diaphragm had a hole in it then air would be escaping out that allen head plug.
Am I wrong about that?
I was able to move the plunger in the AFC forward with a screwdriver.
There is air pressure at the diaphragm fitting.

This problem may have existed for a long time ; for several years I've only used it to plow snow (pretty low power needed for that ) and an occasional run to get lumber. I did tow a 6000 lb (car) trailer back two years ago and the only problems I had were a a leaky pinion seal (since fixed) and a cop who insisted I couldn't tow an unregistered vehicle on a trailer.
(Pleasant enough fellow...just sort of a dumb@$$)

I'm trying to get the truck more road worthy so the wife will stop nagging me to get rid of it.
So I hope you can help.
 
Do you still have the stock fuel plate in the stock position? With it you should get about 20 psi of boost, and with the 180 pump probably 2400 to 2600 rpm. Push it in 4th or 5th for max boost readings. There is tons of info about tuning the AFC, but I've never done anything other than turn the star wheel toward the front of the truck. AFC diaphragms are known to break, also well documented how to test.
 
Other than taking the plug out I haven't done a thing with the AFC.
So I'm completely not sure what's in there.
Testing of AFC diaphragms might be well documented somewhere, but I haven't found those archives.
All I've been able to find so far is how to make the thing blow lots of smoke - rather than figure out if taking half the freaking fuel system off just to get to the little bugger is worth the time.
Thanks for pointing that out.
 
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