Re: 2005 GC- Mileage, Plugs

As was mentioned so far in this thread, OEM is best.  If you look under 
your hood, there will be an emissions sticker that will give the spark 
plug type and gap recommended.

Same for spark plug wires for those that still have them.  The longest 
lasting and cleanest burn always seems to come from the OEM wires.  I am 
even running OEM distributor cap and wires in my old 86 CJ7.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '08.  Some Canadian Bush Trip and Build
Photos: http://mikeromainjeeptrips.shutterfly.com

John wrote:
> Anyone have spark plug  recommendation for a 99 GC 8 cyl?  How about the

> gap setting?
> 
> "Steve Richards" <fixmypc01@[EMAIL PROTECTED]
> wrote in message 
> news:3y51k.44$fc.34@[EMAIL PROTECTED]
>> Alrighty, read lots of posts and I thank you all for the input. My 
>> buddy (Manager) at the local 'zone is a Mopar nut and sees it all...
>>
>> He stated that he read an article or TSB somewhere that stated 
>> Chrysler did not recommend anything other than the OE plugs, citing 
>> their belief was that the Bosch platinum (and variants) caused 
>> pre-ignition. So, I went OE, although no NGKs were available, so in 
>> went Autolites. Funny thing is, 'zone's system states gap at .044, 
>> underhood sticker says .040. Set them all at 40 and took her for a 
>> spin to Laughlin and back. 75 miles, 20 mile 6% grade down into the 
>> valley and back up- 23.2!!!!! We have never gotten that result before.
>>
>> In brief, I'm stuck on the OE plugs, and just put Autolites in my 97 
>> Ford 460 motorhome chassis. Have yet to run a full tank through her...
>>
>> Thanks all for your valuable insight!!!!
>>
>> -- 
>>
>> 2008 Sonata SE- His
>> 2005 Grand Cherokee-Hers
>>
>> AZ home for sale near Laughlin, Las Vegas, BHC:
>>
>> http://www.realtor.com/realestate/golden+valley-az-86413-1089865380
>>
>> "Steve" <no@[EMAIL PROTECTED]
> wrote in message 
>> news:G_-dnb60OZ2z_9nVnZ2dnUVZ_vWdnZ2d@[EMAIL PROTECTED]
>>> Steve Richards wrote:
>>>> Just checking in, the missus has the 3.7L and the specs say plugs 
>>>> every 30k. She's really up in arms about the fuel prices. That's a 
>>>> topic for another day. Sure am glad I don't have a diesel!
>>>>
>>>> She's getting 17-19 (80% hiway). I pulled the plugs (50K) and they 
>>>> are the original NGKs. We're the second owners and I am really 
>>>> surprised that they haven't been changed. Air filter is clean and we 
>>>> use 87octane.
>>>>
>>>> Anyway, I am planning on replacing the plugs tomorrow with Bosch 
>>>> Platinum IIs. Pros/cons and your feedback would be appreciated.
>>>
>>> As far as I'm concerned, there are NO "pros" to Bosch platinum plugs. 
>>> The tiny center electrode is a perfect design... IF your goal is to 
>>> completely negate the longer wear life of Platinum by forcing the arc 
>>> to strike in exactly the same place every single time. And if you 
>>> want to make sure that the metal electrode erodes down so that its 
>>> below the face of the surrounding hard insulator, and therefore one 
>>> little fleck of deposit can cause it to misfire.
>>>
>>> If you want platinum plugs, buy a set of Autolites. They're 100 times 
>>> better than the Bosch crap.
>>
>>
>