Originally Posted by seed60
What's the proper gap for Autolite plugs, 2003 4.0???
..and I want the RIGHT information!!! lol
I used Autolite XP this time, gapped to .065 The computer at the parts store said this was the proper gap for that plug in that engine. When I got home I double checked on the Autolite site. Although it may depend on what style of autolite plug you are using.
After doing some research I found that the gap is more dependent on the plug than the engine. The "e" code is for the SOHC engine and from what I found the "x" code is for an OHV engine. Then again when it came to the engine code I did find some conflicting and rather vague info regarding what it means. All I know is that I have the "e" engine code. I found this out by inputting my VIN number into the Motorcraft site. From what I can tell the engine code is the 8th letter/number from the left on your VIN number. Don't quote me on this as I'm not positive.
Again the issue I was having wasn't because of improper gap. I checked and the NGK plugs I used were supposed to be gapped at .052-.054" This issue was that I probably over-torqued the plugs and cracked the insulators. Reason 1,495 why I like working on diesel engines more than gas engines.
I've actually been thinking that it would be a cool project to drop a diesel motor into a ranger. Something like a JD 4045H, nearly 400 ft-lbs of torque would be pretty sweet. I don't know if you could even wedge that engine into a ranger. Maybe something I should research a little when I get some time.