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Topic: Changing 6 spark plugs out of 8?

in Forum: C4 Engines

Changing 6 spark plugs out of 8? (1/5)
 3/16/19 11:12am
aldocar
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Joined: 12/3/2016
Posts: 89

 The weather is getting better and look forward to enjoying the car.  I would like to change my plugs but there is no way in hell I can get to the 2 front plugs on passenger side the AC compressor covers it. The plugs in there now are AC Delco FR3 cls the owner's manual calls for AC Delco FR5 ls. Is the 3 the heat range rating?  Is it lower or higher than the 5 rating?  If I change the plugs I can get too and do not change the front 2 what impact would this have on engine? I would have the two front plugs changed at the end of the season by my mechanic or just have them all done at end of season.  Car runs good.     Thanks for any information.

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Re: Changing 6 spark plugs out of 8? (2/5)
 3/17/19 11:23am
The Car Whisperer
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Andover, MA - USA

Vette(s):
1986 Coupe


Joined: 3/22/2009
Posts: 50

You can get to them through the wheel well with an extension and a flex joint.  I would change all eight spark plugs without question.



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1986 "Bright Red" COUPE - Aluminum Heads,
Sport Seats, Bose, Ultra-Flo Exhaust,

Automatic, Bilsteins - "Mostly Original" otherwise.

Re: Changing 6 spark plugs out of 8? (3/5)
 3/17/19 12:39pm
Atchafalaya
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Atchafalaya Basin, LA - USA

Vette(s):
Black 1979 L-82 Black 1996 LT1 Black 1999 Coupe


Joined: 3/20/2009
Posts: 573

The Car Whisperer said: You can get to them through the wheel well with an extension and a flex joint.  I would change all eight spark plugs without question.




I agree...change all 8.
Re: Changing 6 spark plugs out of 8? (4/5)
 3/17/19 1:28pm
aldocar
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Joined: 12/3/2016
Posts: 89

Thanks for the info I ordered a flex ratchet will try.

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Re: Changing 6 spark plugs out of 8? (5/5)
 3/25/19 12:57am
Hot Rod Roy
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Mission Viejo, CA - USA

Vette(s):
Yellow '84 Coupe


Joined: 3/18/2015
Posts: 74

Changing spark plugs is part of learning how to take care of your car properly.   Installing your new plugs is easier if you'll slide a piece of 3/8" fuel hose over the insulator.   A piece about 8" long works good, and will also help to prevent cross-threading the plugs!

Cool

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