C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

I just got a plug job!!!

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Old Mar 1, 2005 | 08:14 PM
  #1  
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Default I just got a plug job!!!

Just finished my plugs on my '91. Took about 2 hours and even though I was a littleshaky with doing it, no problem. Took my time, drank some coffee, and pet the dog in between each plug. Patience and trial and error was the best teacher. By the way, when the job was
finished, the coffee turned into beer. Life is good.
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Old Mar 1, 2005 | 08:57 PM
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It gets quicker every time. I think it took me almost that long the first time I changed the plugs on my 91. Now I've got down to about 30 minutes
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Old Mar 1, 2005 | 09:09 PM
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It's a whole lot easier on my 85 vette than it was on my95 formula.On the f body you must replace the last 2 plugs on the pass side from under the car.
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Old Mar 1, 2005 | 09:24 PM
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Kudos to you My first try took nearly three hours and several band-aids
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Old Mar 1, 2005 | 09:27 PM
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well done, first time on my '88 took 4 1/2 hrs
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Old Mar 1, 2005 | 10:30 PM
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My first time with my 93 LT1 took me about 3 hrs... would've been 8 had I not consulted the forum first.
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Old Mar 1, 2005 | 10:33 PM
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Mine (today) took 4 1/2 hours (first time and I had a plug break while I was doing it). A couple of bandaids and dirty fingernails, but boy what a feeling of doing it yourself.
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Old Mar 1, 2005 | 10:35 PM
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Hey, are there any tech. notes on this job. I have heard that #8 is a bear, and special tools required, etc.?

Any suggestions would be cool.
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Old Mar 1, 2005 | 10:39 PM
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The way I finished the last 2 (furthest 2 on the psgr side) was to remove the back and middle skirt of the wheel well. The last one (91 Vette) was tricky - I tried to use a long connector on the ratchet and broke the plug (was at a wrong angle, I'll never do that again). I used a socket wrench that flexed at the head and squeezed my hand through the wheel well.
Next time it'll be a lot quicker.
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Old Mar 1, 2005 | 10:45 PM
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I think it goes a lot easier with the heads off and it's about the only way I've been able to use a torque wrench on the plugs. Otherwise, removing the passenger's inner fender, the compressor (if you have the Nippondenso) and accumulator as an assembly and setting them aside, gives you a little better access at #2. For #8, you can remove the EGR tube, but even that can be a challenge and of course you'll need new gaskets. I also keep a handful of the wire retainer clips on hand and sometimes I unbolt the clip mounts from the head too, particularly if I'm replacing wires.
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Old Mar 1, 2005 | 11:06 PM
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My 89 takes 12 plugs; 8 for the motor, and the other four I drop in the suspension trying to get #2 in
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Old Mar 2, 2005 | 11:47 AM
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I thought the #8 plug was easier than the #2 plug. I anticipated the #8 plug being difficult so I made sure I had all of the necessary tools ready. One thing I noticed was the old plugs (AC Delco FR5LS) had anti-seize on them which made them easier to get out. When I put the new plugs (AC Delco Rapid fire #5's) back in I did the same thing. The one concern I had was the amount of torque need for the aluminum heads. I consulted an ole horse mechanic and he gave me an old spark plug boot and said I should put the plug in with the boot (because of the aluminum heads, and it had a better feel than with the socket) till the boot slips and then tighten to 1 o'clock with a standard ratchet wrench and that's about 15 lbs of torque. He also said it would be hard to find a torque wrench that could calibrate that low. Whether he was right or not, I don't know but the job did go easier. I did take the inner wells out and that made the job smoother.
Try it, but be patient.

Last edited by jrscott; Mar 2, 2005 at 12:10 PM.
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Old Mar 2, 2005 | 11:55 AM
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Default Don't say that too loud outside of San Francisco

I just got a plug job!!!

But seriously, if plugs will turn coffee into beer, I'm going to the parts store right now.
That's the modern day equivalent of turning water into wine, right?
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Old Mar 2, 2005 | 12:11 PM
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Only for us earthly creatures (and shade tree mechanics)
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Old Mar 2, 2005 | 04:03 PM
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This may sound strange, but I've found that some of the plugs on the passenger side are easier for me to get to if I sorta lay across the motor (starting from the driver side). Weird, but it works.
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