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#215739 - 09/11/11 08:03 PM spark plugs
dirtdriver11 Offline
Junior Member
Registered: 09/11/11
Posts: 22
I have 99 grand prix gtp, what is the best spark plug to use? It is bone stock and the highest octane fuel I can get around here is 89 with 10% ethanol.
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#215740 - 09/11/11 08:46 PM Re: spark plugs [Re: dirtdriver11]
RooK Offline
Member
Registered: 03/07/05
Posts: 5158
Loc: Southern KY
Bone stock, you can run a lot of things. Factory plugs in Autolites are 606s. You can drop down one heat range to 605s if you want.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne
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#215741 - 09/11/11 11:07 PM Re: spark plugs [Re: RooK]
dirtdriver11 Offline
Junior Member
Registered: 09/11/11
Posts: 22
Is the 89 octane with 10% ethanol sufficient for a gtp?
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#215747 - 09/12/11 09:45 AM Re: spark plugs [Re: dirtdriver11]
HercMan(Rob) Offline
Member
Registered: 09/12/03
Posts: 14035
Loc: Fort Worth, Texas
If your at high altitudes yes. As altitude increases octane ratings go down.
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#215749 - 09/12/11 10:22 AM Re: spark plugs [Re: dirtdriver11]
dirtdriver11 Offline
Junior Member
Registered: 09/11/11
Posts: 22
I am in the middle of Kansas. The only fuel available is 87 or 89 with ethanol.
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#215750 - 09/12/11 01:00 PM Re: spark plugs [Re: dirtdriver11]
DenverGT Offline
Member
Registered: 08/29/06
Posts: 74
Loc: Denver, CO
89 octane isn't great, but as long as you are on stock pulley and PCM it should be safe. The car will just pull timing as it reads knock.
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