Need info on Injector replacement

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Mar 23, 2005 | 11:37 AM

C4Me

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Pro

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From: Buford Georgia

Need info on Injector replacement

I am ready to put the fuel rails back in and begin the rebuild. I have a 89' L98 that is basically stock. Injectors went bad and I am replacing them. Novice mechanic but this has been fun...except for getting the EGR out and working the fuel rails out. Only busted my knuckles twice.

Here is what I am not sure of. Are there torque specs for:
1. Fuel rail bolts
2. Runner to Plenum
3. TB to Plunum

Or should they just be tight.

I know I need a manual and just placed my order so I should have it going forward but need some help now.

I'm going to replace the EGR and clean the plenum and TB before reinstalling. Is there anything else that would be good to replace at this time.

Thanks in advance for your help.

Mar 23, 2005 | 02:33 PM

85vet

Melting Slicks

Joined: Oct 2000

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From: Heidelberg PA

Cruise-In V Veteran

I just tighten them. never had a problem.

Mar 23, 2005 | 03:13 PM

Morley

Drifting

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From: GA

Don't take it as gospel but I believe the runner bolts are 15-20 ft/lbs.
Fuel rail bolts don't matter, no sealing going on there, snug em up.
Throttle body..not sure, but I use the same tq as the runner bolts.

Mar 23, 2005 | 03:17 PM

AdamBlattel

Heel & Toe

Joined: Mar 2005

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Tighten'n em...

I would say tight is tight.. but if those fuel rails are going to an aluminum intake, liek I think those are, be carefull not to over tighten them...

Adam

Mar 23, 2005 | 06:39 PM

C4Me

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From: Buford Georgia

Thanks guys. Appreciate the input. Now time to put it all back together.

Mar 23, 2005 | 10:00 PM

music_man

Instructor

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From: Cicero, IN "Change is inevitable, except from vending machines"

I did the same on my 90 Vert, I also installed a new EGR since I was in there, clean the Plenum, Throttle Body, IAC Motor, and I put in a new thermostat also since it hadn't been replaced as far as I new.
Good Luck - it went back together pretty easy. I just made sure everything was tight and have had no problems.

SB

Mar 23, 2005 | 10:06 PM

JAKE

Le Mans Master

Joined: Feb 2000

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From: Kempner Texas

Quote:

Originally Posted by C4Me

Thanks guys. Appreciate the input. Now time to put it all back together.

Be sure to coat the bolt threads with anti-seize. If you don't you may need dynamite to get them off later. Any steel bolt screwed into aluminum should get coated, even spark plug threads.

Jake

Mar 24, 2005 | 01:04 AM

Movnviolation

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From: Hesperia California

I have an 89 also and recently replaced the injectors. While I was in there, i replaced ther EGR just because. I also found some intake manifold bolts loose. I replaced the intake manifold gaskets just because also for peace of mind. Saw a little oil pooling in low spots.
Throw away those tork bolds and get some hex head bolts. I got mine from a hardware store. You will see what I am talking about when you torque them.
Good wrenching!