What plugs do you use?
Freshman User
Joined: Feb 2003
Posts: 37
Likes: 0
What plugs do you use?
No offense, but I'd be surprised to hear Bosch (or any other manufacturer - for that matter) say anything but good things about their own product
Ditto. Nothing like firsthand experience. I do have a bit of word of mouth experience. But coming from a chebby guy....
Ditto. Nothing like firsthand experience. I do have a bit of word of mouth experience. But coming from a chebby guy....
Thread Starter
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Senior User
Joined: Mar 2003
Posts: 340
Likes: 1
From: NY
What plugs do you use?
This is probably 35,000 miles.
Can anyone explain the buildup of crud on the one side of the plug?
I noticed that on all the plugs one side burned clean and the other side was filthy.
Can anyone explain the buildup of crud on the one side of the plug?
I noticed that on all the plugs one side burned clean and the other side was filthy.
Elder User
Joined: Mar 2003
Posts: 628
Likes: 0
From: Colorado
What plugs do you use?
No explanation - but the right hand plug ( in the picture) appears to have been loose and has carbon buildup on the outside like a rich mixture would cause. I don't see anything like it in my "plug diagnosis" pic's - unless I get creative with combinations...
Nice pictures!
I REALLY need to get a digital camera. I have my last two sets of AP-45's, they looked too good to toss...even after 50K.
Nice pictures!
I REALLY need to get a digital camera. I have my last two sets of AP-45's, they looked too good to toss...even after 50K.
Last edited by broncr; May 12, 2003 at 10:19 PM.
Post Fiend
Joined: Jan 2000
Posts: 5,860
Likes: 4
From: Metro Detroit (Redford)
What plugs do you use?
The standard Motorcraft copper plugs seem to wear out quickly in my truck. Last time I put in platinum Motorcraft plugs. We'll see how long they last. Some advised against it, but given that Motorcraft lists platinum plugs specifically for the 300 I6, I figured it would be OK. I believe the Motorcraft site has a discussion on several types of platinum plug--solid, plated, and wire--and that only the one (plated I think) was listed for the 300. One thing I noticed about the platinums (both mine and some I had for the Aerostar) is that you can wiggle the center electrode.
Postmaster
Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
What plugs do you use?
I run Autolite 5125's in my 300. Denso Iridium IT-20's in my Lightning.
I have never had any luck with plugs other than AC, Autolite, and Motorcraft. This is my first experience with Denso's in my own vehicle, but so far I like them. On customer's vehicles we use only AC, Autolite, or Motorcraft unless we can't get the correct plug without going to a different brand. 4 times out of 5 if we install anything but those 3 in a domestic vehicle it comes back for a miss, rough idle, or some other plug related problem.
I have never had any luck with plugs other than AC, Autolite, and Motorcraft. This is my first experience with Denso's in my own vehicle, but so far I like them. On customer's vehicles we use only AC, Autolite, or Motorcraft unless we can't get the correct plug without going to a different brand. 4 times out of 5 if we install anything but those 3 in a domestic vehicle it comes back for a miss, rough idle, or some other plug related problem.
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Junior User
Joined: Apr 2003
Posts: 84
Likes: 0
From: Oklahoma City
What plugs do you use?
I just pulled a set of Champion truck plugs. I was so impressed with the way they looked I bought another set. They didn't look anything like yours. My 4.9 want's to run a a little lean, maybe that's the difference!
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
I run Autolites in everything. I'd use Motorcraft, but not very many parts stores stock them anymore. (Around here anyway.)
Chumpions used to be good plugs until they went to the coper core some fifteen or so years ago, they've been junk ever since. Almost as bad as AC, but not quite there yet.
For giggles I put Splitfires in something around here, I forget what. They didn't do a darn bit of good.
Chumpions used to be good plugs until they went to the coper core some fifteen or so years ago, they've been junk ever since. Almost as bad as AC, but not quite there yet.
For giggles I put Splitfires in something around here, I forget what. They didn't do a darn bit of good.
Senior User
Joined: Jun 2004
Posts: 103
Likes: 0
FI plugs in carbureted engine/head
I read in another forum (fordsix) that the use of plugs designed for fuel injected 300cid engines in 300cid carbureted engines will allow for better combustion and technically slightly better power (maybe even fuel economy?). Some guys, however indicated that doing this caused more pinging in their vehicles. Proponents of the idea say that the longer FI-plugs will position the flame closer and deeper in the carbureted head chamber (without hitting the piston) allowing for better burn of the air-gas mixture. Has anybody here tried this and had any good results (better power, fuel economy, more or less pinging)?
Raul ('78 F100 300cid, 4-speed, all stock w/ 119K original miles)
Raul ('78 F100 300cid, 4-speed, all stock w/ 119K original miles)
Senior User
Joined: Nov 2004
Posts: 202
Likes: 0
I am buying Motorcraft today. $3.53/each
Also Motorcraft Rotor ($27.99) and Cap ($7.99).
Just bought some Taylor wires ($90). They are Blue. (Woooooo)
In Canada (big land to the north) we don't have Autolite and I couldn't find Bosch for my truck.
Some say NGK are good. Champion are for Cryler/Dodge.
Also Motorcraft Rotor ($27.99) and Cap ($7.99).
Just bought some Taylor wires ($90). They are Blue. (Woooooo)
In Canada (big land to the north) we don't have Autolite and I couldn't find Bosch for my truck.
Some say NGK are good. Champion are for Cryler/Dodge.