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Before I read in the forums that Boschs were bad, I bought a set, and had GM install them w/ new wires. I currently have Bosch +4's in car with about 100 miles on them if that. They are much better than the AC's that were in the car, but I have read that platinums aren't good with this car. AC's make them, so should I avoid those too? Some have said to use Iridiums, and that AC makes them for this car, but their website does not list them for my 91 yet. I would like to get a good plug that will last a long time with no fouling or poor cold engine performance (boschs appear to possibly have this problem) I would rather not have to replace the cheapo AC's every 30K but I will if I have to if its the best for this engine.
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1992 Grand Prix SE 3.1l 155k SOLD :(
1992 Grand Prix GTP 3.4l 55K
1991 Grand Prix GTP 3.4l 5 speed 99K SOLD :(
1988 Pontiac Fiero GT 2.8 5 speed Turbo 36K Sold
2011 Mazda 3s 5dr 6 speed
2008 Grand Prix GXP 5.3l 24K sold -
Just have the parts store look up Iridiums for a newer 660. Spark plug hole size/threads/depth is all the same on the 660 family.-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed
[URL="http://60degreev6.com/forum/garage_vehicle.php?do=view_vehicle&id=23"]92 Black Lumina Z34 5 speed[/URL] (getting there, slowly... follow the progress [url="http://60degreev6.com/forum/showthread.php/50279-My-92-Z34"]here[/url])
94 Red Ford Ranger 2WD-5 speed
[QUOTE=Jay Leno]Tires are cheap clutches...[/QUOTE]
[IMG]http://i143.photobucket.com/albums/r148/Tasios77/Picture072crop.jpg[/IMG] -
I disagree. Think the best plug I came w/ the DOHC engines is the Torque master plug.
If you can fab up some custom spark plug wires from MSD (w/ a low ohm rating), and wiring in A MSD DIS-2 spark box in there, then get the S-plugs from torquemaster. Watch youre throttle response go crazy.
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whatever you decide to go with i would stick to either NGK or AC Delco plugs... even the newer OE plugs from GM are NGK's. something to be said if GM is using them stock.
SShane "RedZMonte"
[B]2004 [COLOR="blue"]Corvette Z06 Commemorative Edition[/B][/COLOR] [b]-VIRGIN[/b]
[B]1995 [COLOR="red"]Monte Carlo Z34[/B] [/COLOR] 14.38@101mph, 331hp/355tq
-Turbonetics T04E Super 60 Turbo, 2.5" Borla Catback, OBDII, 42.5# Injectors
[B]2004 Subaru WRX STI [/B][I]-Lightly Modded (SOLD)[/I]
[B]1994 Lumina Z34 [/B][I]-VIRGIN (SOLD)[/I]
[B]1992 Lumina Z34[/B][I]-VIRGIN (RIP)[/I]
[B]1992 L67 Lumina Z34 [/B][I](SOLD)[/I]
[B]1990 Turbo Grand Prix [/B][I](SOLD)[/I]Comment
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Yo, red monte,
I highly disagree. I've tried them all. Their was a new and improved GM plug (can't remember the name), Ive tried regapping the Splitfire plugs, NOTHING amps up that throttle response in a DOHC engine like that Torquemaster Splug. That's assuming the
ignition can jump the extra plug gapp on those plugs. I Don't know what the stock plug
gapp on those DOHC 3.4 engines are.Comment
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according to alldata a 97 LQ1 uses 41-919 gapped at .045[CENTER][B]1995 Monte Carlo LS[/B] 3100, 4T60E...for now, future plans include [B]driving it until the wheels fall off![/B][IMG]http://i598.photobucket.com/albums/tt68/robertisaar/NewSig.png[/IMG]
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i have a 95 mc z34 with 3.4dohc has 111,000 on it i run rapidfire plugs no problemComment
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I've been running Bosch platinum + 4 for three years with no problems... A few IC module issues and a dead CP sensor but plugs are fine.1991 Pontiac Grand Prix GTP / 3.4 DOHCComment
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Reply 2 Robertstar
Sirs,
The splitfire S plug is equivalent to a .060s plug gapp. That's why a spark box needs to be run with it. Someone said that their using a platnum plug
in their Dohc v6. I had a problem w/platinum plugs in a DOHC quad 4. Be careful, I ended burning a hole in my header because I wasn't burning all of
the air/fuel mixture in the combustion chamber. All of those problems went away with the S plugs. They say their plugs w/last the life of the car.Comment
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I've run the #8's for years without a problem as well. I was told that they weren't in the right heat range though, and they tend to leak compression where the ceramic meets the metal so I was considering switching to NGK this year after having good results with them in customer cars.Originally posted by tommyz34 View Post-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed
[URL="http://60degreev6.com/forum/garage_vehicle.php?do=view_vehicle&id=23"]92 Black Lumina Z34 5 speed[/URL] (getting there, slowly... follow the progress [url="http://60degreev6.com/forum/showthread.php/50279-My-92-Z34"]here[/url])
94 Red Ford Ranger 2WD-5 speed
[QUOTE=Jay Leno]Tires are cheap clutches...[/QUOTE]
[IMG]http://i143.photobucket.com/albums/r148/Tasios77/Picture072crop.jpg[/IMG]Comment
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Our waste spark system tends to trash Bosch plugs in a short amount of time because of the way it works. I bet you would be surprised if you put a different set of plugs in it.Originally posted by GTP091 View Post-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed
[URL="http://60degreev6.com/forum/garage_vehicle.php?do=view_vehicle&id=23"]92 Black Lumina Z34 5 speed[/URL] (getting there, slowly... follow the progress [url="http://60degreev6.com/forum/showthread.php/50279-My-92-Z34"]here[/url])
94 Red Ford Ranger 2WD-5 speed
[QUOTE=Jay Leno]Tires are cheap clutches...[/QUOTE]
[IMG]http://i143.photobucket.com/albums/r148/Tasios77/Picture072crop.jpg[/IMG]Comment
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Yup. Plus they are not usually the correct heat range for the car.
I replaced my friend spark plugs in his Jeep cause it was running bad, guess which ones they were? And guess what happened to 2 of the plugs? Ceramic shattered off... Hope his engine spit them out without chewing on them or getting caught in a valve... I wonder if they were the wrong heat range and messed up because of that? Usually though I think they are too cold...
But yes you need double platinum plugs with waste spark DIS.[URL="http://isaachayes.60degreev6.com/"][SIGPIC][/SIGPIC][/URL][SIZE=1][COLOR="RoyalBlue"][/COLOR][URL="http://isaachayes.60degreev6.com/z26/ss-todo.htm"][IMG]http://isaachayes.60degreev6.com/z26/signature1.jpg[/IMG][/url] [COLOR="#FF4000"]New 2010 project (click image)[/COLOR]
1994 3100 BERETTA. 200,000+ miles
[/SIZE] [SIZE=1]16.0 1/4 mile when stock. Now ???[/SIZE] [SIZE=1][U]
Original L82 Longblock[/U] with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
[/SIZE]Comment
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plugs
i can only speak for myself, i had 2 z34's i just bought another one 2 months ago, and just picked up a 95 gp gtp. i have always used the bosch +4 plats. i never had a problem with them at all, i had cheap AC DELCOS at one point, i find the car wont idle as good as the plats. also along with good coil packs by MSD with taylor's 8.4 mm wire. this is what i have, you might wanna try this set up, it's all prefference bud,Originally posted by Cidacious View Post
In a quiet town full of chevy's, you can hear a FORD rust.Comment
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so what plugs do you guys use?In a quiet town full of chevy's, you can hear a FORD rust.Comment
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read the previous posts to find out. (the two pages before your comment)Originally posted by z34gtp383 View Post[CENTER][IMG]http://farm3.static.flickr.com/2535/3720709567_f04161890c_o.jpg[/IMG]
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