Throwing $$ @ loss of power ISSUE

[eagle mark]

It sounds like your regulator gasket is slipping off center when installed? The rebuild kits come with 2 long alignment pins, screw them into the holes that do not have pins to hold gasket. Then push down on regulator spring can down to bottom (one nice smooth motion, no twists or turns) and hold it there while you insert and tighten the two remaining torx screws. Remove alignment pins and install torx screws. Can loosen all four a few turns and make sure gasket has no wrinkles or when tightening the wrinkles flatten out.

Blow in inlet with your mouth and it feels like it's closed = good. Blows right through means it's slipped = bad.

If the regulator slips of center a little with stock pump it is just open and you get fuel pump pressure, not spring regulated pressure.

 

[eagle mark]

All the stock springs I have are 2 1/2 inch.

I have 2 aftermarket springs that measure 1 11/16. Did the TBI unit come from a later 7.4L engine? Or does it have 54mm bores?

Now I don't know what the 94-95 7.4L spring height is? These later TBI units run smaller injectors at around 30 PSI.

When you compress springs does the smaller one feel stronger?

 

[FenderChest]

Mystery potentially solved

It sounds like your regulator gasket is slipping off center when installed? The rebuild kits come with 2 long alignment pins, screw them into the holes that do not have pins to hold gasket. Then push down on regulator spring can down to bottom (one nice smooth motion, no twists or turns) and hold it there while you insert and tighten the two remaining torx screws. Remove alignment pins and install torx screws. Can loosen all four a few turns and make sure gasket has no wrinkles or when tightening the wrinkles flatten out.

Blow in inlet with your mouth and it feels like it's closed = good. Blows right through means it's slipped = bad.

If the regulator slips of center a little with stock pump it is just open and you get fuel pump pressure, not spring regulated pressure.

I was thinking about wheels87 comment about "unusual and oops moments
"....... and then I read your input ,I went into the garage to look.. what's up???
I noticed some marks on the fpr diaphragm. The only thing that could do this is the mod "SCREW" .

http://s1239.photobucket.com/user/havaelky/library/1988 K5 Blazer/A FPR Mod SCREW

I think, because of the math differences in the "screws", I was completely blocking the regulator & passages. Also explaining the flow and amount of return line pressure/volume..( I thought WEAK). Mark you said it.." this is the 15 psi"...pump pressure at the gauge

I will test when I get Injectors back.

 

[FenderChest]

Received parts/Testing

Hello All,
Ok ...So I received my injectors back from Mr. Injector ( Nice man to deal with..great work).

I had put two pods together....( Both with the original screw)

The 1st.pod was with the 2-1/2 " spring that was originally in the TB......I pre adjusted a little bit higher than the stock 10 psi fpr I tested earlier

Results....Only achieved up to 11.5 PSI.

The 2nd. pod ...1-11/16" spring......14 PSI.

I installed the 2nd pod on the TB and went on to set minimum air, Idle speed and TPS.

http://i1239.photobucket.com/albums/ff512/havaelky/1988%20%
20K5%20Blazer/A%20FPR%20Mod%20SCREW/IMAG0098_1.jpg

Question....Assuming, I have a stock ECM and chip's ... What is the "Target Idle Speed" in the chip. ??????


Example~~~~~ Target idle speed in chip is 700 RPM
Less - 125 RPM
------------
Minimum idle speed = 575 RPM

I may have done mine wrong ... if this^^^^ is the correct way to do it.????

I just set RPM to 700 in park ????

Thanks for any feedback
FenderChest

 

[wheels87k5]

To set idle speed, you will need to adjust IAC and TPS.

http://www.thirdgen.org/tpimod2