changing fuel injectors

[91coupe]

getting ready to change the injectors on my 91 L98
Just looking for some input on using remanufactured injectors!
going with bosch III!
also what special tools do I need if any!

Thanks for the help!

 

[grumpyvette]

read thru this thread and its sub links

viewtopic.php?f=55&t=1378

http://fuelinjectorconnection.com/shop/ ... ductid=202

viewtopic.php?f=32&t=596
ALWAYS TEST ALL YOUR INJECTORS OHMS RESISTANCE, WITH A MULTI METER, IF YOUR ENGINE RUNS BADLY ,INDIVIDUALLY< THEY SHOULD ALL BE VERY CLOSE TO EQUAL, ANY THAT ARE NOT NEED TO BE REPLACED
youll need a G.M. TPI, o-ring kit , and intake gasket kit for your year TPI, intake and an extended reach #40 and #45 torx bit and Ive found the longer 1/4" drive extensions are helpful

If you find you have a fuel leak, remember fuel pressure is a MEASURE of resistance to flow, get a gauge and measure the fuel pressure on the fuel rail shrader valve, if your not, getting pressure. its because theres little or no resistance to flow, or your pumps not running and pumping fuel or the fuel pressure regulators leaking,
your leak is or should be rather obvious, if the upper end of the injector leaks fuel out of the fuel rail, very obviously the upper injector o-ring thats been installed is either incorrectly assembled or the wrong o-rings were used
verify the fuel pressure with a fuel gauge connected to the shrader valve on your TPI fuel rails,

GM part number for the complete fuel rail o-ring kit is 17111696

if your TPI FUEL PRESSURE REGULATOR DIAPHRAGM LEAKS youll find it difficult or impossible to be starting your car
heres a link to the correct o-rings they are light blue
NAPA sells them at times

http://tpiparts.net/inc/sdetail/10950/300

17113544 - Injector Seals
17111696 - O-Ring Kit
22514722 - Fuel Inlet O-Ring
22516256 - Fuel Inlet O-Ring


The above part numbers provided me with all of the seals shown below circled in red. I would recommend that you replace these seals whenever you service your TPI system. Remember, you've got gasoline under about 45 pounds of pressure flowing through the fuel rails etc. A leak could easily catch fire and cost you your car.

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