On Thu, 06 Dec 2007 00:12:37 -0500, "Tony D." <nospam@[EMAIL PROTECTED]
>
wrote:
>Dan wrote:
>> Can anyone here shed light on the recommended 25,000 mile service
>> intreval recommended for spark plugs in my Magnum RT with the 5.7L
>> Hemi? I replaced them once at about 30,000 and that did not help with
>> a rough idle that the car has had nearly since it was new. Now I'm
>> due to replace plugs again. The original plugs looked like new after
>> 30,000 miles. I suspect the current plugs are the same. Any point to
>> replace them? They cost $5 each and the Hemi takes 16 of them, so I'm
>> hesitant to spend the bucks if I don't need to.
>>
>> Dan
>The 30K change is recommended only because they're standard plugs. Use
>platinums for $2 more and change them at 60-100K.
Only if you are only going to own the car for 50-90K
I might not CHANGE the plugs at 30, but I'd pull them and check them
and increase the odds of being able to remove them when they DO
require replacement at 100K
I just changed the plugs on my 95 Pontiac 3.8. It's got 361,000km the
chassis, and just over 90,000km on the plugs (which were NOT platinum,
and had been checked and found still serviceable back at about
$45,000km) They were still firing just fine, but the gap was about 10
thou over spec when I pulled them last week. I put a set of NGK plats
in (same plug as the AC Delco which is now made by NGK) because my
brother got me a good price on them ((about $2 more than the standard
plug IIRC)
Doubt if the truck will go another 100,000km to wear these out, so
there is a good chance I won't be pulling them to check 2 years from
now.
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