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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 01-23-2010
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Spark Plug questions

Alright someone tell me the difference between the sohc and ohv spark plugs b/c I have looked at both and there are no differences from what I can tell they look exactly the same and they have the same threads and everything. Also I have the screamin Demon Coil Pack on there and your apparently not suppose to run that on an sohc either. But it runs great tho.
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Old 01-23-2010
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your truck is a 1998. The SOHC didn't come out until 2001.
so your truck is an OHV NOT AN SOHC
and what the hell are BAUSCH plugs????

Dishonesty will get you nowhere on R-F.
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Old 01-23-2010
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I think he did the OHV to SOHC swap. I know someone on here did...
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Old 01-25-2010
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LOL! https://www.ranger-forums.com/forum2...4-0l-sohc.html you did catch my spelling error tho. its bosch not bausch lol.

Last edited by Alex98; 01-25-2010 at 09:56 AM.
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Old 01-25-2010
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Quote:
Originally Posted by Machine090767 View Post
your truck is a 1998. The SOHC didn't come out until 2001.
so your truck is an OHV NOT AN SOHC
and what the hell are BAUSCH plugs????

Dishonesty will get you nowhere on R-F.
Yeah he did. And what do you mean by "Dishonesty will get you no where"? I dont think he was being dishonest. Just trying to get some answers.
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Old 01-25-2010
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SOHC's do have different plugs, Most parts stores don't differentiate between the 4.0's though. Look up plugs for a 2006 Mustang 4.0
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Old 01-25-2010
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I know they do have different plugs but they look the same and actually i put my old bosch plugs in from my ohv and it seemed like the oss was unplugged but for some reason it fixed it self and now it runs pretty good its the strangest thing.
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Old 01-25-2010
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Quote:
Originally Posted by Alex98 View Post
I know they do have different plugs but they look the same and actually i put my old bosch plugs in from my ohv and it seemed like the oss was unplugged but for some reason it fixed it self and now it runs pretty good its the strangest thing.
SOHC plugs are a little longer than the OHV plugs.

Parts stores have plug charts wrong in most cases, with regard to these engines. Get correct number from new car manual or dealer.
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Old 01-26-2010
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ahh ok thank you
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Old 01-26-2010
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Like most others have said, most auto parts stores got 'em all messed up and don't differentiate the 4.0's. Best bet is to do what Cole said, look up a '05 Mustang 4.0. lol.

Don't run Bosch's in it Alex. I ran 'em once in the Ford and ran like garbage and many others report the same thing. Run either straight up Motorcraft stock plugs or Motorcraft knockoffs, Autolites. APP5144 is your Autolite Double Platinum part number. 5144 is the correct plug # for Autolites...prefix and suffix are the different model lines (AP5144 is the platinum). I don't have the Motorcraft number on-hand at the moment.
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Old 01-26-2010
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Yeah I had those in the ohv for a period of time the Dbl. Plat. and they ran pretty well, ive also had the Bosch's in it and they all seemed to do pretty well how did it run like garbage?
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Old 01-26-2010
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I ran the Bosch Single Plat's and they were properly gaped for Ford spec(like 0.045?...been a long time. lol). The thing wouldn't idle all too good and throttle response wasn't up to par. Had new wires, pretty new coilpack, new fuel filter, new oil in it. Threw in the APP5144's and the idle smoothed way down and throttle response bumped up.
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Old 01-26-2010
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i was always told to use autolite, and not to use... irradium? in any ford
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  #14  
Old 01-26-2010
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I am running my ohv bosch 4's and they are running pretty damm good i might add but they didnt at first tho which is very strange.
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