L98 Injector Install
Burning Brakes
Joined: May 2011
Posts: 838
Likes: 2
From: Louisville Ky
the Haynes (yes, Haynes) has a decent chapter on it. I believe they pull plenum and right runner together, then left, don't remove throttle body except unbolt it, so don't drain coolant.
saludos, joe
**have heard posts that do not remove runners. some bolts underneath on opposite side, don't recall how they did it.
Last edited by joe paco; Jun 26, 2011 at 06:13 PM. Reason: added
Safety Car
Joined: Jan 2004
Posts: 3,759
Likes: 8
You probably will if the injectors having the clips on them. Though, some have left the runners in place and broke down the fuel rail to remove the rail/injectors. Though, it's best to remove the runners.
If you've replaced the injectors before and they don't have the clips. Then you should be able to leave the runners in place and just lift the rail up and pop the injectors in/out.
If you've replaced the injectors before and they don't have the clips. Then you should be able to leave the runners in place and just lift the rail up and pop the injectors in/out.
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
I have done it it twice without removing them. I don't know which is better because I never took them off.
Go to the first link, after Jon's videos, in his post(the first one) It is a Word document that Sam Lam wrote on how to do it without taking the runners off. It;s the procedures I used when I did mine.
First time it took me 6 hours, the second time it took 4 hours. Calderone also has some videos of how to replace injectors that's a must watch as well.
http://forums.corvetteforum.com/c4-t...questions.html
Go to the first link, after Jon's videos, in his post(the first one) It is a Word document that Sam Lam wrote on how to do it without taking the runners off. It;s the procedures I used when I did mine.
First time it took me 6 hours, the second time it took 4 hours. Calderone also has some videos of how to replace injectors that's a must watch as well.
http://forums.corvetteforum.com/c4-t...questions.html
Thread Starter
Racer
Joined: Apr 2010
Posts: 285
Likes: 0
From: New Prague MN
Might as well pull em, they could use a nice coat of paint anyway. I only asked because I cannot seem to remove the runners without removing the valve covers. Everything is stock. Is this normal? or am I missing something simple?
Thanks for all the replies.
Chris
Thanks for all the replies.
Chris
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette
Pouria Savadkouei
Thread Starter
Racer
Joined: Apr 2010
Posts: 285
Likes: 0
From: New Prague MN
Hmmm. I must have missed something simple then. I replaced the upper intake gaskets this spring and for the life of me I just could not rotate the runners out with the valve covers on it. Guess I will just light that firecracker when I get to it.
Thanks
Thanks
Instructor
Joined: Apr 2007
Posts: 225
Likes: 1
From: Highland Village texas
I have done it a bunch of different ways. Yes you can do it without pulling the runners. You pull the retainers on the transfer tubes front and rear between the rails. push the transfer tubes in on one side till it clears the other rail. Remove the egr valve. then pull up the rail on the side not connected with the transfer tubes up and out through the middle then pull the transfer tubes out of the other rail then pull up and remove the other rail. This can be a pain if the transfer tubes have been in the rail for 20 years. The easiest way to me is to pull one runner and egr valve pull up and remove slightly diagonal. valve covers dont have to be removed don't forget the hidden inner runner bolts one on each side.
Racer
Joined: Nov 2010
Posts: 476
Likes: 4
Did mine about 2 weeks ago.
It is a job but like others have said, the whole job is easier with the
runners out of the way IMO.
As for removing them with the VC's in place, make sure you have ALL the bolts removed (inside ones too) and just
"roll" the tubes inboard. They'll clear OK. It's a big Jig-Saw puzzle but not that bad of a job.
Good Luck!
It is a job but like others have said, the whole job is easier with the
runners out of the way IMO.
As for removing them with the VC's in place, make sure you have ALL the bolts removed (inside ones too) and just
"roll" the tubes inboard. They'll clear OK. It's a big Jig-Saw puzzle but not that bad of a job.
Good Luck!
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
I have done it it twice without removing them. I don't know which is better because I never took them off.
Go to the first link, after Jon's videos, in his post(the first one) It is a Word document that Sam Lam wrote on how to do it without taking the runners off. It;s the procedures I used when I did mine.
First time it took me 6 hours, the second time it took 4 hours. Calderone also has some videos of how to replace injectors that's a must watch as well.
http://forums.corvetteforum.com/c4-t...questions.html
Go to the first link, after Jon's videos, in his post(the first one) It is a Word document that Sam Lam wrote on how to do it without taking the runners off. It;s the procedures I used when I did mine.
First time it took me 6 hours, the second time it took 4 hours. Calderone also has some videos of how to replace injectors that's a must watch as well.
http://forums.corvetteforum.com/c4-t...questions.html
didn't see the plenum clearly to know what he did.
my thoughts were to remove 4 bolts to the plenum, leave the Tb there so as not to drain coolant.
am I confused? thanks
Racer
Joined: Nov 2010
Posts: 476
Likes: 4
Calderone's video was good (like the accent) but he jumped through the TB totally, whether to remove with plenum or leave connected to the coolant line. he did remove throttle lines.
didn't see the plenum clearly to know what he did.
my thoughts were to remove 4 bolts to the plenum, leave the Tb there so as not to drain coolant.
am I confused? thanks
didn't see the plenum clearly to know what he did.
my thoughts were to remove 4 bolts to the plenum, leave the Tb there so as not to drain coolant.
am I confused? thanks
Plenum slips out pretty easy with the top bolts removed.
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
I unbolted the TB and just moved it forward out of the way. Kept the coolant lines conected (although Matatk, from C/F & Corvette-Guru, who helped me with mine suggested doing the coolant line by-pass which I'm going to do latter).
Plenum slips out pretty easy with the top bolts removed.
Plenum slips out pretty easy with the top bolts removed.
doing mine when injectors get here. i ran the video again, noticed the TB on plenum so he drained the coolant.
first time, you're looking for shortcuts, you know? what the hey, got plenty of time, the main reason I am doing it, since the 91 runs close to perfect. did not ask Jon if fuel line o rings were in kit. any idea?
Le Mans Master
Joined: Aug 2010
Posts: 9,272
Likes: 17
If you have one side off, not much more work to remove the other one and renew the gaskets, cheap insurance. dont know if you want to , but now is a good time to do valve seals, valve springs, 1.6 rockers, pushrods. did that on mine at the same time, runs like new. Didnt want to do alot of thinking , so I bought the complete compcam kits that ecklers has on their web site, cheaper then I could get them from compcams. you can get them cheaper from other sites, but I figured a company that specialized in vettes had already done the home work.hope this helps
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
Calderone's video was good (like the accent) but he jumped through the TB totally, whether to remove with plenum or leave connected to the coolant line. he did remove throttle lines.
didn't see the plenum clearly to know what he did.
my thoughts were to remove 4 bolts to the plenum, leave the Tb there so as not to drain coolant.
am I confused? thanks
didn't see the plenum clearly to know what he did.
my thoughts were to remove 4 bolts to the plenum, leave the Tb there so as not to drain coolant.
am I confused? thanks
ps : what my accent sounds like ?
i always like to know that...
Burning Brakes
Joined: Jun 2008
Posts: 892
Likes: 1
From: New Smyrna Beach Florida
I believe the question is "absolutely nessessary". The answer is "no". I swapped out injectors 3 years ago without removing the runners, and my feeling was "if it ain't broke, don't fix it". there is a tech tip on it. Worked for me. 
Instructor
Joined: Jun 2011
Posts: 182
Likes: 0
From: Bowling Green Ky
anyway, I can do it either way, looked at the video and you removed it, didn't see the coolant drained. I'm only doing this for something to do. the old 91 has 110K and runs near perfect, 0-5000 rpm. original multitec's I reckon. I doubt that the Bosch's will last that long.
wern't those Bosch's you had in there? curious.
jc
Melting Slicks
Joined: May 2010
Posts: 2,082
Likes: 3
From: Conowingo Maryland
I have done a few. It can be done with or without removing the runners. You do not need to drain or open the cooling system, unbolt the TB and let it hang. There is no reason what so ever to remove the valve covers unless you have a need to. They do not interfer with doing the job.