how big a prob?..

looks like the plenum has to come off to get at the fuel runners..

all stock 1990 L98 coupe

engine would run fine, after 15mins, i would get hesitation and bucking...

then the engine would just cut off...

it was diagnosed as an injector shorting out.....

shop wants $800...

i know i can buy the injector for about $60 (and up)

cant be to bad removing the plenum...can it?

thanks in advance..

 

I've never done it, but have heard it's a bear! That being said, I don't think it's an $800 bear. I think you have to take off the plenum and runners to get to the fuel rails, but don't quote me on that.

If I were you, I'd also go ahead and replace all your injectors. If one's shorting, then they're all probably getting to that point in their lives, ya know what I mean? I picked up a full set of Bosch III's from Jon at FIC for $200. Much cheaper than the $800 that shop wants for one injector.

 

PM SENT

 

My suggestion is to contact Jon at FIC and get a set of Gen III Bosch.

Removal and replacement isn't that difficult. Search for SamLam posts on replacement.

It took me about 3.5 hrs on my '90, following his directions.

 

Do whatever Jon (FIC) says...he won't steer you wrong...

 

FIC is www.fuelinjectorclinic.com unless they moved.

 

Fuel Injector Connection, not clinic.

www.fuelinjectorconnection.com

But yeah, FICINJECTORS is Jon. Good guy.

 

It's not a bad job and there is a post, I think by Sam Lam, on how to remove and replace injectors without removing the runners. I took everything off, cleaned and painted so it takes me longer. If you do it, make sure you mark everything clearly for reinstallation. I had never done it before but I had read all I could on here and with some help and my FSM, I was able to do both of my cars with no troubles.

Good Luck

 

You can do it without removing the runners but you will need to loosen the runners and remove the plenum.

 

Got mine from Jon @ FIC for my '90 L98. Will be assembling next week.

1985-1993 Corvette, Camaro Pontiac T/A Bosch Design III upgrade Fuel Injector
http://fuelinjectorconnection.com/sh...&productId=134

Bob Lam’s article on injector removal
http://webpages.charter.net/buddiel/...al)%201-04.doc

TPI Injector Replacement
http://www.thirdgen.org/injectorswap

How to change your fuel injectors
http://www.corvettefever.com/howto/c...uel/index.html

Intake Plenum Gasket
http://www.autozone.com/R,APP1104544...ductDetail.htm

Fuel rail seal kit
http://www.autozone.com/R,APP1136249...ductDetail.htm

 

Finished my install today. Local Corvette Sevice shop quoted $1300 for new injectors installed. Including the $95 they charged me, it cost me a total of $345 to do myself including a new fuel filter at the local oil change place. The hardest part was the teardown, and when I had problems after the re-install, Jon was there to help with solutions and wanted to know the results! FIC 100%

 

I resealed the intake on my '90 a while back and took pictures. Doing the injectors is less work, but the pictures help to the injector replacement stage:

http:http://www.jacnsue.com\Corvette\Repa...ake_reseal.htm

The pictures are all thumbnails which open to pictures with more detail.

Hope this helps some.

 

it's very do-able, but just takes a loooong time. like 10 hours of scraping gaskets, cleaning up parts that have 20 years of grime baked on. I've done it twice, and the 2nd time is much faster due to less cleaning. don't let anyone tell you it;s a 4 hour job. plan an entire weekend from start to finish.

I want to try Jons injectors, but I won;t tear my down again.

 

here is the link to his procedure
http://webpages.charter.net/buddiel/...al)%201-04.doc

 

I would start the car with an injector unclipped from the connector, and if it acts the same way, plug that one back in, and unclip the next one. i am very skeptical that that is the problem. each bank of injectors are fused, so you might have to go through 8 fuses.
i would do that, and if that doesn't prove anything,I would start by checking codes, fuel pressure, air filter, fuel filter, etc.
I would go as far as to borrow someone's ECM and remove it try it, and replace it in that guy's car. If there's nothing wrong with his unit, I would give him the new unit for the money saving, time consuming hassle of not having to buy one to troubleshoot but use his part and leave his computer in your car.
Just my 2c worth, but the real pat on the back here is to change the correct part after doing research, evaluating your findings, and changing the faulty unit. not numerous parts that you didn't need in the first place.
When I work on the plane, If I buy parts because I don't know what's wrong and I guess, I won't have the job very long. Airplane parts are expensive. for instance an autopilot computer is $31,000 and it takes 2 of them to make up a complete brain for that autopilot. Change that set, and you have almost wasted half a year's salary guessing. That was only one guess. how bout if you try 3 guesses?
evaluate, play with the vehicle, take voltage measurements, check grounds, connectors, and rigging. THEN go talk to someone who knows more than you do about the problem, Just be sure you are familiar with all of the symptoms when you pickup the phone, and complain it doesn't work right.

 

the car wouldnt start with the number two injector plugged in...

uplugged, the car runs, but runs rough...

i think i have found my issue...

 

Consider pullin' the intake too. Once you get past the runners, the intake is cake.

If you do not pull the intake, make sure the injector-to-intake ports are free of chunky stuff that could fall into the intake when you pull the injectors.

If you do pull the intake, take it and the runners, and the plenum to the car wash. I took my intake to a shop with a chemical cleaning tank, and after that, I went to the car wash with the high pressure hose. You'd be surprised what the tank missed. Wasted $35 at the shop. Stick the wand in EVERY hole. And keep your mouth closed while you do it.

Make SURE all gasket surfaces are clean enough to eat off of. You don't want a vacuum leak after major housecleanin' like that.

 

Does that sound familiar
http://forums.corvetteforum.com/show....php?t=2072870

Must be a '90 thing

 

I tried to do it w/o removing runners, and ended up removing them. It's not that hard. When the runners and plenum were off I used a acid based wheel cleaner from Car-Brite to clean them. They looked like new afterward. The dist. cover must be magnesium and painted, because it didn't clean. The Fel Pro kit has fuel line o rings, 2 different sizes. Make sure you know which is which before you remove them.

 

Has anyone used the Bosch EV1 High Impedance or FIC Blue Demon Peral injectors from Fuel Injector Connection? I'm trying to figure out which ones are best for 1991.