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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 09-12-2010
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spark plug answers

I've read and searched on here for awhile and am still a little confused. I want to put new plugs in my '03 4.0 SOHC and would like to use Motorcraft plugs but apparently according to dealer parts people its a different part number now. Suprisingly, of the all the dealers within 20 miles, they only have 5 plugs in stock at about 7 different dealers....seems strange...not convinced they are looking for the right plug. Owners manual calls for a AGSF-34FP plug.

My questions are...

What is the current parts number for the plugs? Again, it is an '03 4.0

Can I get them (Motorcraft plugs) at a parts store (O'reilly, Advanced, AutoZone) etc. and if so should I ask for 2005 or so Mustang 4.0 plugs since I have heard that their catalogs give you the the 4.0 OHC plugs?

Gonna try and do this tomorrow, just need some solid answers. Thanks

Last edited by klc317; 09-12-2010 at 11:30 PM.
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Old 09-13-2010
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yes u can get them at auto parts store. i got mine at advance, they were like 4 bucks a piece though. i think part number was something like sr400 or 500 idr.
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  #3  
Old 09-13-2010
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Autolite double plats are the same as the motorcraft plugs.

They are both made by Honeywell.
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Old 09-13-2010
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most parts stores will have a book at the counter or rack with the part number for most makes/models... o look up your truck and it will tell you what will fit
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Old 09-13-2010
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Quote:
Originally Posted by ranger4.0 View Post
most parts stores will have a book at the counter or rack with the part number for most makes/models... o look up your truck and it will tell you what will fit


Yeah but most parts store catalogs don't differenciate between the 4.0 OHC & SOHC so you'll end up with the wrong plug.
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Old 09-13-2010
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yes they do. they always go by year and specific vehicle. go look
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Old 09-13-2010
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The books I looked at had the same plug listed for the OHV and the SOHC...I just looked up plugs for the Explorer.
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Old 09-13-2010
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I found a dude at Autozone that just cross referenced 4.0 Mustang plugs and we came up with the correct plug. Took a minute but he was helpful. His computer had the same plugs for the OHC also listed for my SOHC. I told him it wasn't right and he was happy to do some searching for me. Ended up with Autolite platinum 5144s...I'll make a new thread with pics, changed them earlier today. I called around to a few dealers here in town and even if I spent all day driving from dealer to dealer I could still only come up with 5 Motorcraft plugs. Suprised the dealers dont stock them more.
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Old 09-13-2010
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glad to hear that the parts store could help you out
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Old 09-18-2010
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I just installed a set of E3.54 plugs in my "04 sohc 4x4 and it runs and idles like crap. It had a set of NGK TR55GP plugs in it before and it ran fine. Any one know if they are the wrong ones. they weren't cheep and will be pissed if I need to change them again. I keep getting a miss fire code as well. I first thought it was my coil so I replaced it with an Accel super coil. No change.
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Old 09-18-2010
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Quote:
Originally Posted by HouseofFinch View Post
I just installed a set of E3.54 plugs in my "04 sohc 4x4 and it runs and idles like crap. It had a set of NGK TR55GP plugs in it before and it ran fine. Any one know if they are the wrong ones. they weren't cheep and will be pissed if I need to change them again. I keep getting a miss fire code as well. I first thought it was my coil so I replaced it with an Accel super coil. No change.
from what i hear these trucks only really run good on motorcraft or autolite i would stick to them

and to the OP i know you already got new plugs but im going to run out and check my owners manual on my 2010 for the motorcraft part number for you for future reference
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Old 09-18-2010
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nevermind under spark plugs it says see your ford dealer for the correct part number use of a incorrect part may void new vehicle warrenty
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Old 09-19-2010
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I just installled denso iridium's
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Old 09-19-2010
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Quote:
Originally Posted by HouseofFinch View Post
I just installed a set of E3.54 plugs in my "04 sohc 4x4 and it runs and idles like crap. It had a set of NGK TR55GP plugs in it before and it ran fine. Any one know if they are the wrong ones. they weren't cheep and will be pissed if I need to change them again. I keep getting a miss fire code as well. I first thought it was my coil so I replaced it with an Accel super coil. No change.
e3's are a joke way to watch spike tv and allow yourself to be sold useless crap maybe some pulsestars will do the trick next there only $25 a peice. ngk makes some of the best plugs around, there isnt a higher quality plug then their iridium IX
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Old 09-19-2010
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APP5144 is the SOHC autolite double plat plug.




The BS your ford dealer is pulling is BS....they can order the plugs and have you a full set in 1 day.
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Old 09-21-2010
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I'm a Bosh Platinum Guy to start with, and as soon as I saw the Quality of the E3's I was a bit sceptical. Poor quality in the porcelain and the standard fat electrode. I bought them with nothing to do with spike TV, it was more for the promise of better MPG. I just prey they stand by there money back guarantee.
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Old 09-28-2010
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I just got an e-mail from E3 and they told me that they recommend the E3.53 rather then the E3.54 because they are a cooler plug. The hotter E3.54 hight be causing a pre-ignition. I guess the only way I'm going to find out is if I replace the current plugs with new ones. I'm going to attempt to get the parts store to refund or replace the incorrect plugs.
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