Replace L98 Injectors
Thread Starter
Drifting
Joined: Mar 2011
Posts: 1,693
Likes: 144
From: on Barnegat Bay Joisey
Replace L98 Injectors
Hello folks, I need to replace the injectors in my '90 L98 and would like your recommendation on what brand to buy. I see several brands being offered like Accel, Bosch and Delphi. Should I only consider new or are rebuilts OK at half the price? Thanks in advance.
Pro
Joined: Oct 2011
Posts: 703
Likes: 76
From: leesburg fl
St. Jude Donor '12
For my 90 I called Jon at FIC and put in what he said and that was new stainless steel body delphi. My car runs great. I cant say what the other injectors will perform like. It was the first time for my car.
Thread Starter
Drifting
Joined: Mar 2011
Posts: 1,693
Likes: 144
From: on Barnegat Bay Joisey
Thanks for the heads up. Do you know where I can find a tutorial showing a step by step taking off the plenum, runners and manifold? I looked in my FSM but its not very descriptive. Some of those 40 torque sets look like a bear to get at.
Le Mans Master
Joined: Oct 2008
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From: Houston Texas
Team Owner
Joined: Jan 2009
Posts: 73,568
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From: Somewhere in Mo
St. Jude Donor '09-'10, '14
You can also take off the plenum without taking off the runners. It's a toss up on which way is easier.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
In another thread he mentioned having a coolant leak at the intake that he has not taken care of yet.
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Thread Starter
Drifting
Joined: Mar 2011
Posts: 1,693
Likes: 144
From: on Barnegat Bay Joisey
Thanks for the tutorial...it's just what I need to do the job. I feel I have the mechanical ability to do it but being a senior the spirit is willing but the back is weak. I just finished rebuilding the headlight motors and getting in under the hood wasn't easy.
Pro
Joined: Oct 2010
Posts: 695
Likes: 55
From: Palm Desert California
I replaced my injectors in my 91 2 years ago . I agree, Jon at FIC (fuel injection connection) was very helpful. He sold me refurbished Bosch injectors and they have worked out great , really improved the idle quality and performance of my car. Also Jon is in Cumming Georgia a good ole boy like me. The injectors are yellow and with my new yellow plug wires the engine looks great. If I knew how to post a pic I would but I don't yet. Don't fret a bout install , if I can do it anybody can. Just follow the FSM and the video from the other thread. I labeled EVERYTHING I took off the car and put them in baggies ( I tend to forget alot) . Good luck.
Le Mans Master
Joined: Jul 2004
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From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Always been pretty scared to touch the distributor. I know I'd screw up.
How hard are the intake bolts to get off. Any risk of snapping them?
How hard are the intake bolts to get off. Any risk of snapping them?
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
It is not a difficult task. Since you have the manual...you are in 90% better shape than most here on the Forum.
Be sure to label each hose, wire and bolt that you remove. Note that the bolts holding the runners to the intake are different lengths and there are a couple under the plenum that you might not know are there. This will save you headaches when you try and put things back together.
Also, get a couple of rubber push on plugs to plug the fuel lines. The feed line will leak if you don't plug it.
Be sure to label each hose, wire and bolt that you remove. Note that the bolts holding the runners to the intake are different lengths and there are a couple under the plenum that you might not know are there. This will save you headaches when you try and put things back together.
Also, get a couple of rubber push on plugs to plug the fuel lines. The feed line will leak if you don't plug it.
Race Director
Joined: Feb 2003
Posts: 16,475
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From: Kingman AZ
Cruise-In VII Veteran
Cruise-In VIII
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Go to an auto parts store and purchase a long ball tip allen wrench. Makes the job much easier.
Here is a pic of my 91 with the new Bosch IIIs from FIC. Good idea to lube up the O rings with Vaseline before installing:
Here they are with the fuel rail installed. Be sure to install the injectors into the fuel rail first and then seat them in the base next. Less chance of tearing an O ring that way. Jon also advised that it is OK to leave the upper retainer clips off. They were used at the factory as the fuel rail and injectors were lowered from above and the clips kept the injectory from falling out. Once the fuel rail is bolted down it has nowhere to go. I also think it was Jon that advised that the 4 bolts that hold the fuel rail to the base be coated with Loctite.
Race Director
Joined: Apr 2002
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From: Anaheim CA
They are Torx bolts. Don't use Allen wrenches on them. The heads are hardened, but why take chances? Get the correct tools and do it right.
I broke one of the injector retainers so I left that one out. I figured it couldn't go anywhere. It leaked because the injector came part way out of the fuel rail because of the fuel pressure. I bought a new retainer at the dealer. I think it was $8 (outrageous markup on their part, but I wanted it fixed).
I broke one of the injector retainers so I left that one out. I figured it couldn't go anywhere. It leaked because the injector came part way out of the fuel rail because of the fuel pressure. I bought a new retainer at the dealer. I think it was $8 (outrageous markup on their part, but I wanted it fixed).
Last edited by Cliff Harris; Jun 11, 2012 at 12:18 AM.
Race Director
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From: Kingman AZ
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
http://forums.corvetteforum.com/c3-g...e-honored.html
Just remembered that my runners came with a full set of allen head bolts so ignore my suggestion.
Just remembered that my runners came with a full set of allen head bolts so ignore my suggestion.