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Old 12-09-2005, 04:40 PM   #1
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Best Spark Plugs For a 2003 3.8L V-6

Which are the best plugs to run in a 2003 V-6 3.8L (Stock Engine).
1-Bosch Platnum?????????
2-MotorCraft????????????
3-Autolite???????????????
4-Other
And what reasons do you have for the Plugs you recommend............
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Old 12-09-2005, 04:54 PM   #2
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Re: Best Spark Plugs For a 2003 3.8L V-6

I run Motorcraft copper.
You have to change them more often but their performance is better & cost a lot less than Platinums.
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Old 12-09-2005, 04:56 PM   #3
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Re: Best Spark Plugs For a 2003 3.8L V-6

The Ford Dealer told us that alot of people have problems with the Bosch plugs, I`m just wondering if they are just blowing more smoke.
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Old 12-09-2005, 04:58 PM   #4
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Re: Best Spark Plugs For a 2003 3.8L V-6

Quote:
Originally Posted by 860stevenp
The Ford Dealer told us that alot of people have problems with the Bosch plugs, I`m just wondering if they are just blowing more smoke.
Problems in the mustangs, due to the heat range.
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Old 12-09-2005, 05:11 PM   #5
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Re: Best Spark Plugs For a 2003 3.8L V-6

I`ve been reading the forums and found most people dislike the Bosch plugs, except for a few..... I will go with the majority, Autolites or MotorCraft............
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Old 12-09-2005, 05:11 PM   #6
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Re: Best Spark Plugs For a 2003 3.8L V-6

Quote:
Originally Posted by slvr2000stang
I run Motorcraft copper.
You have to change them more often but their performance is better & cost a lot less than Platinums.
Thanks......................
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Old 12-09-2005, 05:13 PM   #7
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Re: Best Spark Plugs For a 2003 3.8L V-6

Autolite are my second choice.
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Old 12-09-2005, 05:37 PM   #8
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Re: Best Spark Plugs For a 2003 3.8L V-6

Do Mustangs heat up quickly or something?
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Old 12-09-2005, 05:51 PM   #9
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Re: Best Spark Plugs For a 2003 3.8L V-6

Quote:
Originally Posted by SonicV616
Do Mustangs heat up quickly or something?
I know mine sure doesn't.....lol. I think he's talking about the spark temperature not being consistant with that certain plug. I run autolites in my car, never had a problem other than regapping when it gets cold/ hot
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Old 12-09-2005, 06:07 PM   #10
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Re: Best Spark Plugs For a 2003 3.8L V-6

run the OEM's they work just as good as any of them
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Old 12-09-2005, 08:44 PM   #11
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Re: Best Spark Plugs For a 2003 3.8L V-6

Quote:
Originally Posted by lowflyn
I know mine sure doesn't.....lol. I think he's talking about the spark temperature not being consistant with that certain plug. I run autolites in my car, never had a problem other than regapping when it gets cold/ hot
LOL too, thanks for the input............ I a`m going to switch to Autolites, or motorcrafts, the engine is detecting a misfire once in awhile and is most likely due to the plugs. Bosch Platniums. We had just put the plugs in and the original MotorCrafts didnt do that. THANKS FOR ALL THE INPUT..........
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Old 12-10-2005, 10:25 PM   #12
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Re: Best Spark Plugs For a 2003 3.8L V-6

The stockers are just fine, I've heard of problems with Bosch, Autolite, ACDelco, Champion, etc. but not Motorcraft.
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Old 12-12-2005, 07:40 AM   #13
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Re: Best Spark Plugs For a 2003 3.8L V-6

i've got autolites in mine and have no problems. just make sure you space the spark gap correctly
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Old 12-12-2005, 07:56 AM   #14
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Re: Best Spark Plugs For a 2003 3.8L V-6

Quote:
Originally Posted by SonicV616
Do Mustangs heat up quickly or something?
No but if the heat range of the plug is higher than normal it can cause pinging.

With advanced timing I actually run 1 heat range cooler plugs.
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Old 12-13-2005, 09:11 PM   #15
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Re: Best Spark Plugs For a 2003 3.8L V-6

A simple copper or a good hybrid plug like an Autolite Platinum.
I'd say anything OTHER than a Bosch Platinum. I tried running them in my '98, and the electrodes burned up into the ceramic in 6,000 miles.
I learned, on another site, that oddly enough, half of the cylinders (drivers side) fire their plugs from the electrode to ground(normal), and the other half (passenger side) from ground to the center electrode(reversed). It has to do with the way the coil pack fires.
This (reverse polarity) also seems to cause Bosch Platinums to burn up faster.
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Old 12-13-2005, 09:13 PM   #16
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Re: Best Spark Plugs For a 2003 3.8L V-6

Yeh, bosch sucks on hte v6
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Old 12-14-2005, 04:30 PM   #17
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Re: Best Spark Plugs For a 2003 3.8L V-6

i wouldnt get anything but motorcraft platinum (stock). i got autolites a couple months ago because they were out of motorcraft... i thought my engine was going to die. i had to change them out after a week or two. i put motorcraft platinum in and never had another problem
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