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#4553463 - 10/24/17 07:29 PM Spark Plug fit are the new plugs too long?
handyman Offline


Registered: 02/15/05
Posts: 300
Loc: TX
I got some new spark plugs for my 2001 Saturn L100. They are Bosch Double Iridium 9617. Autozone, Orilly and Rock Auto says they will fix. I pull one of the old plugs and it is quite a bit shorter than the new plug. Do I have anything to worry about?????
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#4553467 - 10/24/17 07:32 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
JohnnyJohnson Offline


Registered: 10/22/09
Posts: 2737
Loc: Wet side WA
That would have made for a rough start up.
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#4553469 - 10/24/17 07:33 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
mk378 Offline


Registered: 09/27/15
Posts: 1416
Loc: USA
Those are totally wrong. For one thing the new one is a taper seal and the originals are gasket seal. Not even close to being right. Do not attempt to install them.

Now it is possible that the ones you removed are wrong for the engine, though I doubt that gasket seal plugs will fit at all in a taper hole.


Edited by mk378 (10/24/17 07:36 PM)

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#4553470 - 10/24/17 07:34 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
doitmyself Offline


Registered: 06/03/02
Posts: 6213
Loc: MI
Don't use the new one. Maybe worse than the length difference, the new plug has a tapered seat while your old plug has a flat gasketed seat.

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#4553478 - 10/24/17 07:39 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
Dave9 Offline


Registered: 08/28/17
Posts: 176
Loc: Cincinnati, USA
Do you have a 2.2L 4 cyl or 3.0L V6? The original plugs with the flat seat and 19mm reach look right for the 3.0L while the tapered seat with 25mm reach (including the Bosch part # you listed) are for the 2.2L.

This is the correct Bosch Iridium for the 3.0L:
BOSCH 4512
http://www.rockauto.com/en/moreinfo.php?pk=1053685&cc=1374948&jsn=394


Edited by Dave9 (10/24/17 07:44 PM)

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#4553480 - 10/24/17 07:41 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
barkingspider Offline


Registered: 12/22/13
Posts: 2042
Loc: socal
Do not use the new ones. Get the same ones u pulled out or cross reference the part no of the old plugs
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#4553483 - 10/24/17 07:46 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
71Chevyguy Offline


Registered: 07/10/11
Posts: 414
Loc: Martinsburg West Virginia
L100 should be 4 cylinder only, so that would have to be the 2.2 Ecotec.
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#4553485 - 10/24/17 07:49 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
As everyone else said. Wrong plugs! Taper vs gasket.
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#4553489 - 10/24/17 07:54 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
Rand Offline


Registered: 08/20/03
Posts: 12638
Loc: NE,Ohio
If I'm not missing something...
according to rockauto
3.0 has the gasket type.
2.2 has the taper seat plug

The bosch 4512 for the 3.0

and the bosch 4514 for the 2.2

Is it possible someone previously installed the wrong plugs?
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#4553493 - 10/24/17 07:56 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
handyman Offline


Registered: 02/15/05
Posts: 300
Loc: TX
It is a four cylinder.
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2011 Prius III 111k
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#4553505 - 10/24/17 08:04 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
handyman Offline


Registered: 02/15/05
Posts: 300
Loc: TX
Now, I'm wondering if I had the wrong plugs in there in the first place?? but they have been there for 75,000 miles???
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2011 Prius III 111k
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#4553510 - 10/24/17 08:10 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
redbone3 Offline


Registered: 06/09/12
Posts: 654
Loc: Reno, NV
If the new plugs are correct, be sure to use a thread chaser before installing the new longer ones. It's got to have some buildup on the threads.
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#4553512 - 10/24/17 08:11 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
mattwithcats Offline


Registered: 06/13/13
Posts: 1659
Loc: Virginia
Old plugs were wrong...

I would use NGK, one heat range colder...

NGK 6509, LTR6IX-11
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#4553555 - 10/24/17 08:51 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6147
Loc: USA
Use NGK instead smile

NGK #5581
or
ACDelco 41-988

The ACDelco iridium is made by NGK, a reboxed Laser Iridium.

The correct plugs for your car look like the new ones you got at Autozone, the longer thread. So it means the old ones were the wrong size smile

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#4553570 - 10/24/17 09:02 PM Re: Spark Plug fit are the new plugs too long? [Re: handyman]
mk378 Offline


Registered: 09/27/15
Posts: 1416
Loc: USA
Also if you do try them, before trying to start, turn the engine by hand to be sure they don't crash.

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