spark plugs on the 3.5, updated with pics - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-13-2006, 10:31 PM   #1
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Default spark plugs on the 3.5, updated with pics

all i have to say is OH MY GOD....i didnt even get the back ones changed, the front ones took me almost 3 hours....granted im slow, but still...

the coil on plug technology is nifty, but its a pain in the A$$!!

the "ignition cassette" that is built into the...they arent really valve covers, theyre head/camshaft covers i guess...its held on with 7 screws and then its SEALED to the covers....i had to pick at it and pry at it with a screwdriver tor at least an hour or so and then it finally took almost every bit of physical strength i could exert to finish breaking the seal and pull it off...

i was worried about the boots...not a problem, stick a finger in one until it seals tight, then curve your finger a little bit and pull it out....definetely handy to have the small hands..

now the spark plugs are recessed into the heads crazy far, a plug socket with an extension on it offered about 1/4 inch of metal sticking out of the hole, so using TWO extensions and a plug socket i was able to get high enough out of there to turn a wrench....

then at one point i decided it would i would put the socket into the hole without the extension on it....the plug went up into the socket where i couldnt get an extension on there......half hour later the socket was back out....thanks to whoever invented needle nose pliers.

i give props to GM for getting some new technology out there, but its quite a pain for your average shadetree mechanic to do something as simple as changing the plugs..

i still have the back ones to do, im not looking forward to that AT ALL.

end of vent
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Old 02-13-2006, 10:44 PM   #2
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Yeah...this is one of the reason i dont work on my engine myself for these things anymore. You almost have no choice but to let the dealer do it.
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Old 02-13-2006, 11:01 PM   #3
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the following is from an Intrigue forum:

Quote:
Hey,

I'm at 103,000 miles now and I figured that I should follow the owner'* manual and have my plugs changed on my 2000 Intrigue GL. So, I went to a shop yesterday and the guy told me that it would cost $380 to change them!!! He said that when you change the plugs, the wires should be changed as well, and that the Intrigue had special wires that are very difficult to access. What do you all think? Have any of you had your plugs changed? At what price? By the way, I have the 3.5 twin cam engine.
thats why i still do things myself

granted the Intrigue has no wires at all, and that price is probably a bit off...but it would still be expensive, and i cant afford it. id rather pay 15 bucks for a set of plugs and spend some free time doing it myself.
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Old 02-14-2006, 04:40 PM   #4
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thankfully I only have 53,000 so I don't have to worry about it for a while, but either way, I'm not looking forward to it when the time DOES come. How did your original plugs look after you took them out? Do you think it was worth replacing them? What'd you replace them with?
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Old 02-14-2006, 06:42 PM   #5
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they looked to just have normal wear, the ones i removed were some type of NGK, the numbers werent anything i had heard before...but i doubt it came factory with NGKs, which means that someone has been through this hell before.

i replaced them with NGK "G-Powers" which are TR55 platinums from my understanding.

gapped at .50 according to the owners manual, the Chiltons said .60, but they were pre-gapped at .50ish so i went with the manual.

Custom i dont know if you can do it or not, but i plan to actually rotate the engine forward a couple inches...i dont know if the aurora can do this or not, but i can, so i plan to make full use of it, ill try and snap some pics, i was going to on the fronts, but my camera died.
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Old 02-14-2006, 07:28 PM   #6
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Pictures would be great! The more the better. I'm very curious to see what the engine looks like without the coil packs on it.

also, the Aurora'* engine cannot roll forward. :( I wish it could though because I can't even reach my 02 sensor to change it. :(
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Old 02-14-2006, 08:19 PM   #7
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Pictures would be great... I'm interested in that one..

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Old 02-14-2006, 10:16 PM   #8
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Way too much effort for me when the time comes.
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Old 02-15-2006, 01:08 AM   #9
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Quote:
Originally Posted by Custom88
Pictures would be great! The more the better. I'm very curious to see what the engine looks like without the coil packs on it.

also, the Aurora'* engine cannot roll forward. :( I wish it could though because I can't even reach my 02 sensor to change it. :(
count your blessings, i cant even FIND my o2 sensor.....i know its in the rear exhaust manifold somewhere....but i can barely even find that...this thing is cramped pretty good on the firewall side....and kinda all over really.

but i should be working on it tomorrow...i really hope that back one isnt sealed as tight as the front one was....cant blame a guy for hoping.

also another little thing that may or may not have actually helped....after prying on the sealed ignition cassette forever with the engine cold, as in hadnt been run all day...i started it and let it warm up to operating temp and that was when it came off....mind you it was still hard to pull off...but im not sure if things being warm helped, or if i finally just got pissed and ripped the thing off.
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Old 02-15-2006, 10:26 AM   #10
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oh, I should mention I can't see my 02, either. I found it by "feel." It'* on the exhaust manifold, right up next to the rear of the engine. It isnt' down further like it was on the 3800, it'* right at the top of the manifold on the LX5.
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