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Old 01-23-2006, 05:04 PM   #1
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spark plug questions

alright its tuneup time for my 99 blazer!

went to advance auto, got the .045 gap plugs/wires for the truck.

got home measured the plugs. its appears the gap is .045, but the biggest size i can fit into the gap is about .035.

is this normal? when put side to side with the gap tool, it looks exactly .045.

i was reading in the maintenence book i have that .045 should fit in the gap and rub slightly. but it doesnt

im confused whether they need adjusting or not because of this.

part number on the advance auto site is R42LTS
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Old 01-23-2006, 06:05 PM   #2
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Re: spark plug questions

That isn't the right part from the sounds of it. Your gap should be .060"
Old 01-23-2006, 06:15 PM   #3
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Re: spark plug questions

.060 is for the 2.2L engine, mine is the 4.3 .045 is what several books say. even the manual in the truck which is for a W-vin 4.3
Old 01-23-2006, 06:38 PM   #4
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Re: spark plug questions

the gap tool should fit inside the plug gap and rub slightly. when comparing something as small as 45 thousandths of an inch visual comparison can sometimes not be good enuf. id re-gap them to the correct measurement
Old 01-23-2006, 06:39 PM   #5
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Re: spark plug questions

regapped them just now. should be good to go.
Old 01-23-2006, 06:41 PM   #6
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Re: spark plug questions

'96 and up is listed in my haynes manual as using a AC41-932 platnum tip plug or equivelent, gapped at .060(for the 4.3). Owners manual says the same. The owners, and haynes say .060" for both x and w engines.
Old 01-23-2006, 06:45 PM   #7
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Re: spark plug questions

The .060 gap is for the new 4.3ls. It says it right on the emissions sticked
of my '01 & in the manual , not to mention my ngks were pre-gaped at .060

.045 is for the older 4.3ls, thats what it was for my '93 4.3l cpi.
and my brothers '89 jimmy with the 4.3l tbi had a .035 gap
Old 01-23-2006, 06:49 PM   #8
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Re: spark plug questions

since we are having some issues with agreeing on the gap size i pulled out my haynes and checked it and i have to agree that the gap for a 99 engine is .060". 94 and 95 engines use a .045" gap.
Old 01-23-2006, 06:51 PM   #9
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Re: spark plug questions

i havent seen anything but .060" gap ever listed for a 96-up 4.3.

but i do view such a large gap as unnecessary. .045" would certainly be preferable, IMO. i`ve been running plugs for an 89 Trans Am 3.8 turbo that call for a gap of .035" without any problems.
Old 01-23-2006, 10:04 PM   #10
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Re: spark plug questions

check this out guys.

im gonna have to call and find out for sure.

the guy looked up my vehicle, and it had .060s and .045 in the listing?!?!?!?!? gonna have to call tomorrow! first image is from my chiltons. someone is wrong, and its costing me a trip!!!







god damnit !@?!@#? hmmmm

Last edited by Chevyrulz099; 01-23-2006 at 10:13 PM.
Old 01-23-2006, 11:29 PM   #11
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Re: spark plug questions

my '97 4.3 says .060 right on the fan shroud so i guess the .045 is for older ones
Old 01-23-2006, 11:35 PM   #12
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Re: spark plug questions

Just check the underhood decal it should say there, but i'm positive for your truck it will be .060
Old 01-23-2006, 11:43 PM   #13
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Re: spark plug questions

Alot of the manuals are messed up.

My haynes manual told me .035 for my '93 when it was
infact .045 on the sticker that was right in front of my face.
I ended up taking taking them back out and regapping them
Old 01-24-2006, 01:23 AM   #14
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Re: spark plug questions

called my dad up today, and he said that the .045 wont make that much of a difference. he said i could gap them to .050

think ill just take them back tomorrow, get the right ones, and gap them to .060.

this the best course of action?

anything wrong with autolite plugs? just get copper core? do i really need platinum?

can i just space these .045 plugs to around .060 and be done with it? or will that creat problems?

Last edited by Chevyrulz099; 01-24-2006 at 01:44 AM.
Old 01-24-2006, 03:13 AM   #15
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Re: spark plug questions

Don't buy any of that shit. Get Delco NGK or Denso. I wouldn't touch anything else.

Get the Platnums you are suposed to have in there too. Gap will be 0.060"
Old 01-24-2006, 08:07 AM   #16
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Re: spark plug questions

My fan shroud calls for .045!
Old 01-24-2006, 08:10 AM   #17
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Re: spark plug questions

Quote: Originally Posted by Chevyrulz099
called my dad up today, and he said that the .045 wont make that much of a difference. he said i could gap them to .050

think ill just take them back tomorrow, get the right ones, and gap them to .060.

this the best course of action?

anything wrong with autolite plugs? just get copper core? do i really need platinum?

can i just space these .045 plugs to around .060 and be done with it? or will that creat problems?
I run the cheepo autolite 605's. Be prepared to replace them more often.
Old 01-24-2006, 08:31 AM   #18
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Re: spark plug questions

Quote: Originally Posted by betterthanyou
Don't buy any of that shit. Get Delco NGK or Denso. I wouldn't touch anything else.

Get the Platnums you are suposed to have in there too. Gap will be 0.060"
theres nothing wrong with Autolites, or any other brand for that matter.
the std. type plugs just wont last as long as platinums or irridiums.
Old 01-24-2006, 08:49 AM   #19
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Re: spark plug questions

Quote: Originally Posted by betterthanyou
Don't buy any of that shit. Get Delco NGK or Denso. I wouldn't touch anything else.

Get the Platnums you are suposed to have in there too. Gap will be 0.060"
I resent that fact because I work with Autolite. Have fun fouling your NGKs and spending wayy to much on the Densos only to get "so so" results.

Best bang for the buck is the Autolite AP605 or APP605. You'll never need to replace them again.
Old 01-24-2006, 10:23 AM   #20
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Re: spark plug questions

go get the 41-932 AC Delco plugs. about gapping plugs, if you try to gap a plug that was designed for .045 gap to .060 there might be an issue of spark to the shell (threads). the R42LTS may have been designed for .030-.052 gap, any larger gap you would need R42LTS6 (the 6 is for .060 gap). the distance from electrode to electrode on a R42LTS may be farther then from electrode to shell causing spark to jump to the side versus down to the ground electrode end, causing misfire. I designed plugs at AC for a few years but have no loyalty to any companies product, just that the 41-932's were designed to work in that engine specifically.
Old 01-24-2006, 02:13 PM   #21
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Re: spark plug questions

Quote: Originally Posted by lovetheblazer
My fan shroud calls for .045!
thats really odd. what engine code you have? i checked mine last night, .060. going back to AAP and getting the NGK plat .060 plugs. 2$/plug, same as AC delco price
Old 01-24-2006, 03:47 PM   #22
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Re: spark plug questions

ok guys i bought the

NGK G-power TR55GP .060 PlatinumTip plugs

do you space platinum plugs? or just leave them? they are .055 out of box.
Old 01-24-2006, 04:01 PM   #23
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Re: spark plug questions

just leave them.
Old 01-24-2006, 04:34 PM   #24
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Re: spark plug questions

thats what i decided to do.

cool aviator (:
Old 01-24-2006, 06:18 PM   #25
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Re: spark plug questions

Quote: Originally Posted by The Blown Blazer
I resent that fact because I work with Autolite. Have fun fouling your NGKs and spending wayy to much on the Densos only to get "so so" results.

Best bang for the buck is the Autolite AP605 or APP605. You'll never need to replace them again.

I have been running NGK Iridiums for over a year on my 3.4L My brother has been doing the same on his 4.3L. They look like they came out of the box still. I did not buy Denso because they are expensive.
Old 01-24-2006, 06:24 PM   #26
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Re: spark plug questions

Quote: Originally Posted by Crew Cab Sonoma
theres nothing wrong with Autolites, or any other brand for that matter.
the std. type plugs just wont last as long as platinums or irridiums.
I have never used Autolite on my 3.4L but we did use them on my uncles 3.8L and it stumbled under acceleration and did not feel any better than the old worn out Delcos we took out. They were the correct Autolite plug but we took them back and a new set of Delcos worked like a dream. So thats why I am racist towards Autolite. I supose I could give them another chance.

Bosh just plain falls apart in your engine I would not touch them EVER!. I know 3 first had cases where the plug broke down in the cylinder and went through the exhaust valve and tore it to shit. They were all the +4 plugs that they advertise as such an awsome plug.

So no not all brands a are good. There is always a difference between crap cheep plugs and premium plugs.
Old 01-24-2006, 08:25 PM   #27
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Re: spark plug questions

the autolite pro. series plugs came with 7 wires?

wtf?
Old 01-24-2006, 08:51 PM   #28
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Re: spark plug questions

I cant belive you guys trust a haynes manual
Old 01-24-2006, 09:47 PM   #29
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Re: spark plug questions

i know haynes=random gibberish get a chiltons
Old 01-24-2006, 10:02 PM   #30
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Re: spark plug questions

Quote: Originally Posted by Chevyrulz099
the autolite pro. series plugs came with 7 wires?

wtf?
One is the coil wire.
Old 01-24-2006, 10:07 PM   #31
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Re: spark plug questions

thats what i thought.

ill look at them more tomorrow.
i did a little looking under the hood today, in cold weather, and really didnt think i could reach most of the plugs.

anyone done it and got recomendations for what needs to ccome out so i can get in there? can i unscrew the old plugs by hand?
Old 01-25-2006, 03:15 PM   #32
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Re: spark plug questions

any one know any easy way to get the clips off the spark plug wires? i got the plugs changed, but those damn clips cant/wont come apart!!!!!!

they have like a clip on each side, i tried pushing in on both sides at the same time, no go
Old 01-25-2006, 06:11 PM   #33
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Re: spark plug questions

Its a bitch. i had to bend the brackets on mine, so I could
get at it, at the right angle with needlenose
Old 01-25-2006, 06:26 PM   #34
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Re: spark plug questions

i zip tied the two front wires to it. should be ok, ill just keep an eye on the zip ties melting point (:
Old 01-25-2006, 09:36 PM   #35
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Re: spark plug questions

speaking of plugs, i decided to splurge a little. just picked up a set Bosch platinums for my truck tonight. $2.19 ea.

the 89 turbo Trans Am plugs....

Last edited by Crew Cab Sonoma; 01-25-2006 at 09:38 PM.
Old 01-26-2006, 03:21 PM   #36
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Re: spark plug questions

Quote: Originally Posted by Crew Cab Sonoma
speaking of plugs, i decided to splurge a little. just picked up a set Bosch platinums for my truck tonight. $2.19 ea.

the 89 turbo Trans Am plugs....
seriously take those plugs back. there as bad as accel plugs
Old 01-26-2006, 03:33 PM   #37
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Re: spark plug questions

Quote: Originally Posted by serpentracer
seriously take those plugs back. there as bad as accel plugs
Completly agree 100%. You think you splurged and got a good plug. But really they lubed you up and shafted you big time.

Get some Delcos man.
Old 01-26-2006, 05:33 PM   #38
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Re: spark plug questions

i`ve used Bosch platinums for over 20 years now. i`ve used literally hundreds of these plugs in more kinds of cars than i care to remember. lots of imports, GM`s, Fords, Chryslers. carbureted, fuel injected,
turbocharged, and nitrous fed engines too.... thats right.

and i have NEVER had a failure, or problem out of a single one of them...

i`ve also watched many friends use them as well... including one friend with a street/strip camaro with a 417CI SBC with 250-300 shot of nitrous being used with a set of Bosch +4`s, for over 2 years on the same set of plugs... with never a problem from them.

so if you 2 boys COMBINED think you have anywhere near the first hand experience with these plugs that i do, by all means, feel free to tell me about them.....
Old 01-26-2006, 09:35 PM   #39
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Re: spark plug questions

ehh well go ahead. everything I've used them in experience pre mature need of replacements. and there is such a tiny hole for the spark to come from I've seen them fouled out in fuel injected vehicles. especially in one with a weak ignition. nothing runs better or last longer than the platinums by ac delco or NGK. form my experience.
I just trust a factory exact replacement for plugs because I fully feel the engineers at gm know how to match a plugs heat range and type to a specific engine.

Last edited by serpentracer; 01-26-2006 at 09:38 PM.
Old 01-27-2006, 04:42 AM   #40
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Re: spark plug questions

Quote: Originally Posted by Crew Cab Sonoma
i`ve used Bosch platinums for over 20 years now. i`ve used literally hundreds of these plugs in more kinds of cars than i care to remember. lots of imports, GM`s, Fords, Chryslers. carbureted, fuel injected,
turbocharged, and nitrous fed engines too.... thats right.

and i have NEVER had a failure, or problem out of a single one of them...

i`ve also watched many friends use them as well... including one friend with a street/strip camaro with a 417CI SBC with 250-300 shot of nitrous being used with a set of Bosch +4`s, for over 2 years on the same set of plugs... with never a problem from them.

so if you 2 boys COMBINED think you have anywhere near the first hand experience with these plugs that i do, by all means, feel free to tell me about them.....

You have used them for OVER 20 years when Bosch only just released them 20 years ago this year? Sweet!

I have never used a Bosch plug personally. The reason being I have just herd way too many bad stories. I have also whitnessed first hand 3 (yes 3) seperate engines that had the +4 plugs fall apart and go through the exhaust valve and destroy the engine. There is even an old post on 60degreev6.com with pics of the destruction. If I really must prove my point I will go search for it and link you.

I have never had a problem with my Delcos or NGK's. Nor have a herd any horible horror stories about them so I will stick with them.
Old 01-27-2006, 09:36 AM   #41
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Re: spark plug questions

Bosch plugs are a decent quality product. The insulator/centerwire design performs well in normal polarity ignitions, but with the small diameter centerwire shrouded by the insulator it performs awful in reverse polarity ignitions (read: DIS).
Old 01-27-2006, 01:17 PM   #42
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Re: spark plug questions

Quote: Originally Posted by betterthanyou
You have used them for OVER 20 years when Bosch only just released them 20 years ago this year? Sweet!
YES. OVER 20 YEARS... their 20th anniversary was actually last year. Bosch has been running their "20th anniversary" event for over a year now.
i started using them in 1985...right after their introduction. that makes it OVER 20 years.

Quote:
I have never used a Bosch plug personally.
no, of course you havent. that puts you in the same pot as most of the other people who talk bad about them. i guess thats what makes you think you are more experienced with them than i am, huh?

Quote:
The reason being I have just herd way too many bad stories. I have also whitnessed first hand 3 (yes 3) seperate engines that had the +4 plugs fall apart and go through the exhaust valve and destroy the engine. There is even an old post on 60degreev6.com with pics of the destruction. If I really must prove my point I will go search for it and link you.
3 separate engines firt hand, huh? yeah, sure you have....
go find that link. i`d like to examine it for myself.


Quote:
I have never had a problem with my Delcos or NGK's. Nor have a herd any horible horror stories about them so I will stick with them.
there have been reports of the platinum tips falling off the ground electrodes of Delco plugs as well. but you still recomend them?

Delco, NGK, Autolite, Denso, Bosch, ect. are all fine plugs. i`ve used lots of these brands over the years as well. never had problems with them either.

but over the years, i`ve used more Bosch platinums than anything else. and they have never let me down. even in high boost turbocharged, and nitrous aplications that many claim they are a big mistake in.

Last edited by Crew Cab Sonoma; 01-27-2006 at 01:33 PM.
Old 01-27-2006, 01:21 PM   #43
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Re: spark plug questions

use AC DELCO spark plugs, that what my autoshop teacher recommend for GM cars
Old 01-27-2006, 01:23 PM   #44
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Re: spark plug questions

Quote: Originally Posted by 03zq8
Bosch plugs are a decent quality product. The insulator/centerwire design performs well in normal polarity ignitions, but with the small diameter centerwire shrouded by the insulator it performs awful in reverse polarity ignitions (read: DIS).
i`ve used them in DIS cars before, without any noticeable problems.
but i never really thought about the cylinders that are using them with reversed polarity.
have you guys done some tests/research on them? and if so, what kinds of issues do they have?

Last edited by Crew Cab Sonoma; 01-27-2006 at 01:26 PM.
Old 01-27-2006, 03:36 PM   #45
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Re: spark plug questions

Yeah, my thesis was an out of the box required voltage study. I used 17 different gap configurations (center and sidewire enhancements) made in house and I used 13 competitors plugs. The results followed theory for the most part... the smaller the center electrode the lower the required voltage. Of course there are many other influences; such as edge alignment, sidewire alloy, number of ground electrodes...etc.

The only flaw I've seen with a Bocsh plug was their insulator wore very fast in a durability dyno test (Insulators usually don't wear, but they small center electrode wore down so far that it was arching through the ceramic). This test was conducted in the late 90's. We have since retested it and it appears they have fixed the problem.

Thesis:


Last edited by 03zq8; 01-27-2006 at 03:50 PM.
Old 01-27-2006, 07:16 PM   #46
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Re: spark plug questions

damn. now thats some research.
thanks for the info.
Old 01-28-2006, 01:48 PM   #47
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Re: spark plug questions

all I know is when I used bosch in two of my cars...they started stumbling after a couple months and you pull the plugs out and they look old as hell.

Use NGK I haven't had a problem. Like I say about fram....some people trust the shit, but I won't touch it anymore
Old 06-15-2009, 11:25 PM   #48
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Question Re: spark plug questions

question. i have looked into plugs and there gap so far but how about acdelco rapid fires? there gapped at .0625 does that really make a difference or no?
Old 06-16-2009, 01:24 PM   #49
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Re: spark plug questions

Just get them from the dealer...... AC Delco or get the AC delco from the store.... use OEM...
Old 10-16-2009, 07:31 PM   #50
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Re: spark plug questions

choosing spark plugs is not this hard...but here's my two cents: We use delco platinum plugs in all our cars at the track. Only premature problems i've seen is the porcelain crack after a wreck...but come on, it's porcelain.
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