I have a 1990 that will start running rough after it gets warmed up or about 6-10 miles down the road i checked the fuel press. and it would leak down pretty quick i checked the press. reg. ok checked the check valve ok so i started with ohming the injectors 4 are below 14 ohms and after i did the ohm check i checked the fuel press. again and the leak stopped so i am guessing that i need new injectors any input on my opinion would be appreciated.I would also like sugestions as to where to get and what kind to replace with.Thank you

 

FIC an vender on here, best prices and service.

 

If you have the stock injectors, they're bad. Its the brand, age that are the problem.

Who do call>?

Jon @ FIC
fuel inj connection

see the youtube videos under "fuel injectors".

Even good ohms test does not mean the inj are spraying ok. The stock units get dirty and drip fuel instead of spray,.
Your new FIC inj will come with all gaskets and O-rings.

 

Thanks for the info i forgot to say that 2 were at 11 ohms 1 at 7 and 1 at 3

 

worked for me

 

Yup...that qualifies as junk.

Call Jon.

tell him I want my commission check !

 

call jon!!!!

 

Can't add much here.

I too have Jon's injectors in my 90.

 

OK you talked me into it i called Jon today and ordered a set of the bosh rebuilds now to see how the install goes . Thanks for all the info.

 

You'll like what happens. Regardless of how well it was running, it will feel better. I have seen guys buy these inj from FIC for 2 yrs and never seen one that did'nt get an improvement...

A couple tips...

find some long extensions, 1/4" for a 1/4 torx bit to get to the left rear runner bolt and the rt front...Each side has ONE bolt in backwards...so don;t go crazy trying to yank the runners off..
I am kind of bored with torx, so I have a full set of allen heads ready to replace my torx bolts the next time I have reason to tear into the intake again...

Great time to clean the EGR valve port, and test the EGR. A simple vac will tell you if it works or not by watching the diaphram, you can just suck on the vac hose and thats enough for it to move.. Inspect and wrap/tape up the harness sections on the firewall. General housekeeping with the plenum and runners out of the way.

Assemble the O-rings with Vasoline or whatever Jon has in his notes. I like vasoline because it melts away instantly when the engine starts. Once the injector is "set" in the rail and the manifold, avoid twisting it around. The Bosch III are slightly shorter than your stock injector so the runners will be trapped behind the rails after this. The Bosch also have the "F" word stamped in the plastic body but it comes off with a grinder..

When reinstalling the rails and seating the set of injectors, they are not set until there is an obvious pop or hard snap, as they pop into place together. It sometimes takes jumping on the rail fairly hard to get them to snap in place. Be careful with the fuel rails twisting around when they are off the intake...this wrecks the new O-rings between the tubes and rails.
As soon as you bolt the rails down, and connect the fuel lines, turn the key ON to charge the rails with fuel pressure. Look Carefully for ANY leaks at this point...its wayyyy better to find the leaks at that time, than after the whole mess is assembled and has to be torn apart..

I also wipe a thin coat of never-seize on the runner gaskets so they don;t get stuck to the runner flange or plenum. This is a time saver for next time, and the gaskets can be used again because they do not tear.

The new inj do not have a retainer clip, so don't worry about that. Its noted in the instructions.

Check out some youtube videos on the swap...some good info there and one even times the job...took me about 1/2 a day in the driveway. If you're short, thats a plus...if you;re 6' or more...it's gonna hurt.
Took me a month to stand straight again

Enjoy !

 

I like the GM gaskets for the runners and TBI. I think they are made of some type of plastic vs. the paper Felpro gaskets. The GM gaskets don't leave a mess behind when you pull the runners or TBI later on.

 

Thanks alot for all of the help that fixed that problem but i still have a intermitent mis
which i had before the injector change any clues?