Repost: power loss issue

[nativetexan]

The gasket was real brittle. It broke in the middle when i took it off. The regulator comes with a new gasket. So i will replace the regulator and see what happens. A tbi rebuild thread would be awesooome!

[nativetexan]

Replaced the regulator. No dice. No improvement. Where can i get a vaccuum gauge?

[Captkaos]

You can get a Vacuum gauge at any auto parts store.

If it makes you feel any better, my R10 JUST started doing this....  Yippie!

When you replaced the regulator you got a new diaphragm and gasket with it right.

[nativetexan]

it was a rebuild kit. It came with the diaphram, a spring (which was longer than the one that was in there so I kept the original), all gaskets, and two rods, that I have no idea where they go. But yeah the new diaphram and gaskets are in there. I guess I will go look for a vacuum gauge tomorrow.

[1979C20]

Maybe you should use the longer one?.... Maybe thats yoyr problem is the spring in the reg squished?

[nativetexan]

I was thinking the same thing...

[Captkaos]

Put the new Spring in there...  The rods are for aligning everything up with the spring in there.

[nativetexan]

Update: new spring is the short one. Swapped it in and still the same. About the rods, Do they go in the holes next to the screw holes? Do they stay in there? They werent in therr when i took it off. I notice that it happens when the throttle is about a quarter or a third open. You think the injectors are faulty and flooding the intake?

[nativetexan]

Here is a direct link of a video i took of the injector during the acceleration.

http://img803.imageshack.us/img803/4975/ayh.mp4

[nativetexan]

Anybody think it might be the HEI? A friend at work said he had the same issues with a jeep he had...

[rsandusky]

While I wouldn't rule out a problem with the HEI, lets focus on one issue at a time.

Have you tried pinching the return line? Do this only for testing! This should raise the pressure. If it doesn't you have a problem with the supply; weak pump/ wrong pump, hose connecting the pump to the main assy is split (just saw this scenario recently), plugged filter, kinked or plugged pressure line.

In addition to pressure have you checked the volume? Does anyone have the specs? I'm unsure where my manual is.

[nativetexan]

My bad, My setup is not HEI, it has ignition coil sitting next to the distributor. Anyway, I havent tried the pinched line test. I need to go get the pressure gauges from the zone and then I will check that out. Thanks. When I replaced the pump motor, I cut the end off the hose because it was ugly. Its all good in there now. my lines aren't pinched, I followed it all the way to the tbi. Also, here recently I have noticed a slight whistling sound while idling... 

[1979C20]

Th hat slight whistling sound could be 1 of 2 things, it could be just your tbi throat whistling or a vacuum leak. Put your hand over the mouth of the throttle body while its idling and see if the whistling sound changes. If it doesnt, grab a can of wd40 and spray it on all of your vacuum lines, around the base of your tbi, and around where your intake bolts to the heads. If the idle raises at all when you spray a certain area, then you have a vacuum leak

[Captkaos]

The truck will definitley be HEI, but computer controlled.
The rods on the diaphram are for alignment only...
I would pinch off the return line and see if it makes a difference.  Just use some vice grips and slightly clamp on the return line.

[nativetexan]

Whoa! Wait a minute captain, are you saying that if my setup is not HEI, then its not right??is HEI defined by the coil being set on top of the distributor cap instead of mounted to the intake like mine? I thought maybe it was an option but if you are telling me that its only HEI for the 87 5.7 350ci w tbi setup, then i guess some tool did a lil junkyard jerry rig with a ignition coil and a regular distributor. Do you think this could be causing some of my problems?? Should I go back to hei? Thank you for the precious info guys!