Introduction: Poor Mans Repair Guide for Chevy,GMC Vortec Fuel Injector Spider or CSFI System
I hope I can take some of the Dark Voodoo power away from the notorious Vortec injection spider. If your reading this then like I did you have been searching the web and under the hood of you GMC Jimmy, S10, Astrovan, Or Chevy Blazer trying to figure out what to do about that crazy injection system in your truck. Well you have a few choices
1. Buy a new spider set for a small fortune.
2. Buy a "MPFI" retrofit system for about $300.00
3. Try Replacing individual injectors or "poppets"
4. Junk the p.o.s. the front end is falling apart anyway.
or you can
5. Spend about $16.00-30.00 and a few hours of your time and fix it like I do.
This guide explains how to clean/repair leaky or stuck poppet valves/injectors. only continue if you are sure that your injectors are getting a signal from the ecu and are actuating. if your not sure, Google it, do your testing and come back.
I am not responsible for any kind of damage or injury you may cause yourself or your car. Messing around with a fuel system is dangerous, gasoline leaks can and will cause fire and or explosion. Be Safe, Be Smart, Or be Dead.
Step 1: Take a Look at the Injector and Get You Stuff Together
At this point you have pulled the injectors from the fuel meter body, you have your injector reseal kit with all of the o-rings napa and everyone else has them .
napa's part is....
Fuel Injector O-Ring Kit
Part Number: BK 735359
Make sure the meter body has no cracks, this can be fixed in a pinch, Google plastic welding with soldering iron.
Make sure the black plastic tubing is not cracked or too brittle to be reinstalled. They need to be able to hold 60lbs of fuel pressure. If in doubt take an old piece of tubing to the local auto parts store and get some double walled plastic gas line tubing. Ford uses quite a bit of it, as does BMW.
You will need the following in addition to your o-ring kit
1. Carb Cleaner
2.Sea Foam in a can "Deep Creep"
3. A Pot O Boil'in Water and or a Heat Gun "Heat gun is faster but water is safer"
4. A Few pairs of needle nose pliers
5. An air compressor with blow gun.
Optional but highly recommended is an ultra sonic jewelry cleaner "got mine for $30.00 from harbor freight, for the wife......."
Step 2: Heat the Tubing and Pull the Poppet Out.
With this step be patient, you need too heat the black tubing right at the poppet to just the right temp. the safest way to do it is to dip the last inch or two in a pot of boiling water for about a minute.
As soon as you pull the poppet out of the water start to work it out of the tubing with two pairs of pliers.
Be very careful not to scratch the poppet or break the hose. Don't squeeze to hard on the poppet or you will crush it an then you might as well buy the MFI kit cuz the cost about $80.00 a piece.
You will only have a few second at a time to work the poppet out before it needs to go back in the pot. Be gentle and it will come out.
If you are using a heat gun it only takes a few seconds to work it out, but if you over heat the tubing it will become brittle and increase the chance of making your problem much worse.
Step 3: You Got It Out! Time to Clean It.
Great you got that tiny little thing out!
Don't lose it!!!!
Now it is time to test/ clean it.
You might have a better way to do this but the poppet fits perfectly in hole of the rubber piece of my air compressors blow gun.
The poppet is designed to open at about 40lbs of pressure. So l like to start there.
1. Set your regulator to 45lbs.
2.Insert poppet into blow gun nozzle, or ring up some rubber tubing and clamps to hold firmly. The last thing you want is for the poppet to be shot across the garage never to be seen again.
3. Give it a 45lb shot of air. if the poppet opens then obviously it is fairly clean. most likely nothing is going to happen.
4. Take the blowgun from its quick connect and fill it with carb cleaner.
5. Give it another shot of air, if nothing crank it up to 60lbs. and try again.
6. When it finally gives way repeat the procedure until you are satisfied that it is clean.
7. Switch to the deep creep and repeat a few more times."the deep creep will remove varnish an keep everything from flash rusting."
Step 4: Put It Back Together
Now all thats left is getting the poppet back on the hose.
1. Heat the hose like you did before. Heating only the very end will help you keep from kinking.
2. Slowly press the poppet back in, don't rush it.
3. let it fully cool and give it a few good tugs to make sure it set.
The O-ring set comes with instructions follow them.
Make sure you don't have any leaks before you seal up the upper intake manifold!!!
Drive around for 50 or 60 thousand miles and repeat the process and save some hard earned cash.