Well I checked the pressure tonight , When i turn the key on I get 60 psi.
As soon as the pump shuts off it drops to zero within about 10 seconds. With
the engine running i get 53 psi at idle. Is it supposed to drop off or
should it hold pressure ?
You have a problem with the CPI unit or the nut kit. It's not a
terribly difficult job for a DIY person. I had NO mechanical
experience except for changing tires and brakes before I replaced the
one in my 94. Took me the better part of a day, but I had some
trouble and had to go on a tool run in another vehicle.
Go to http://forums.s-series.org and look in the 4.3L tech section,
you'll see a sticky post outlining diagnosis of this problem.
I got my parts from www.partszoneonline.com for a reasonable price,
others are having luck getting new units from Ebay at a significant
If you want me to list the tools I needed and do a quick write-up of
the procedure, I'll go check my tool bag to see what I had to buy. I
know I needed a 10 mm box-end wrench, one stud was too long for ANY
deep-well socket I had available. Maybe a 10 mm crow's foot for a
ratchet would have been a better choice. The Hayne's manual also does
a decent job of explaining it, but it's fairly straightforward, you
need to get the upper plenum off and the injector is right there in
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