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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 09-21-2007
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spark plugs

ive been reading around the site and every one says bosch plugs are bad well i didnt read that before i got the platnum 4s so whats it doing to my car? would i get better gas milage if i switches to diffrent ones?
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Old 09-22-2007
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Test em out for a while, see how you like em. Usually, people will bash cuz they hear other people bash em. I used regular Bosch plugs for 2 years...I jsut replaced them because I got bored and wanted to do something to my truck...they worked fine and I had no problems.

Many applications are different. I say test it for yourself...my friend uses Bosche Platinum 2's (double) when his manufacturer says to use NGK...his engine runs just as smoothly, and his fuel efficiency went up 1 mile in his import...
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Old 09-22-2007
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ya i have the 4s and it runs fine i was jw
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Old 09-22-2007
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Bosch run fine in my gas Mercedes, but caused major misfire in my Ranger!
Stay with the Motorcraft platinums (double or fine wire) and you will be sure
your getting the correct heat range plug!
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Old 09-22-2007
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any others?
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Old 09-22-2007
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motorcraft or autolite double platinum... i run them and my mpg jumped as well as my truck runs better
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Old 09-22-2007
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sounds like i might be switchin
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Old 09-23-2007
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from what i have seen.. its hit or miss.. some people have problems with them, others dont.. its not like your murdering your engine.. just make sure it's the right heat range.. i've ran several different plugs in mine..including these never had a problem with any of them.. only problem i had was with NGK.. i gapped them to .60 (i think they are suppose to be .48 or .58?) and 2 werent tightened correctly and blew the core's out of 2 of them drivin down the road
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Old 10-01-2007
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Quote:
Originally Posted by Takeda
Bosch run fine in my gas Mercedes, but caused major misfire in my Ranger!
Stay with the Motorcraft platinums (double or fine wire) and you will be sure
your getting the correct heat range plug!
I used the Bosch +2's in mine, ran freaken great for the first 100 miles them when down hill very fast. The engine went to popen. Took the plugs out and both electrodes were damaged. I couldnt even see the center electrode. I switched back to autolite's double platinum plug and havent had a problem from them in the last 25+K miles.
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  #10  
Old 10-01-2007
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I've been around the modular V8's for a while and most guys looking to get a little more performance use copper plugs, while they don't last as long as platniums they seem to be what most guys run on 4.6/5.4 engines (including myself).
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Old 10-02-2007
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Quote:
Originally Posted by 245Ranger
I've been around the modular V8's for a while and most guys looking to get a little more performance use copper plugs, while they don't last as long as platniums they seem to be what most guys run on 4.6/5.4 engines (including myself).
Unless misfire is happening, you don't get a performance increase with the type of spark plug you are using.
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Old 10-02-2007
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Quote:
Originally Posted by Takeda
Unless misfire is happening, you don't get a performance increase with the type of spark plug you are using.
Not true. Plug resistance and how shrouded the flame front is, matters. You'll feel it in both smoothness and in slight power increases. Especially in tip in.

But hey.. what do I know.

Rich
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Old 10-02-2007
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Quote:
Originally Posted by wydopnthrtl
Not true. Plug resistance and how shrouded the flame front is, matters. You'll feel it in both smoothness and in slight power increases. Especially in tip in.

But hey.. what do I know.

Rich

The difference in the effective series resistance between copper, and platinum plugs is in 100's of milliohms (0.001 OHMS = 1 milliohm), so resistance is a NON-ISSUE.

BUTT dynos aren't accurate at all!!!!
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  #14  
Old 10-02-2007
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If the Bosch plugs work for you, don't worry about what anyone else says. If they cause problems down the road switch to the motorcraft or autolite double platinums.
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  #15  
Old 10-02-2007
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I say autolight or motorcraft dbl platinums I have had no issues and the truck is running great!!!
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  #16  
Old 10-02-2007
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i wouldnt worry about it for a while.. but i would switch the motorcraft or autolite in a couple years.. there is a reason the manufacturer uses these plugs.
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