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Wow! I know what I'll be doing next. What a great tip. Thanks!

Makes sense. The air temp sensitivity seems to point to something that measures the air. I know the IAT part of it is just a resistor but the MAF part has additional stuff. I verified the firing order in both my Haynes manual and from postings online. Plus one of the COP's was new...

More on this. This afternoon it warmed up to the 70's. The misfire came back.

My wife's 2002 Explorer XLT with a 4.6L started missing when warm especially noticeable at idle. With an OBD2 scanner it showed P0301, P0306, P0316. An online search said those codes indicate mis-fire on cylinders one and six. New plugs and the codes were still there. I purchased one new...

been travelling so, no.

Well, the content of the responses to my post lead me to believe that the charge ports are not normal. It explains the lack of information on the web. I will probably have to change them out at some point to solve this. Thanks for the information.

I'm pretty sure they don't have the dust caps on but I'll certainly check. I'll also check to make sure it is not a test port. If it was just the low side that is smaller, I'd think it might be the wrong port but the high side is smaller too.

I'm gearing up for a trip. When I get back in a week, if I haven't figured this out I would be very grateful to check out the fittings on your 98 and bring my 98 to see how they compare. Q

Even though the R-12 ports I've seen were screw type, the later ones may have changed. I'll see what I can find out. Good idea, thanks.

The rules I see for posting say that I cannot post attachments. Doesn't that mean that I can't post pics?

Interesting that no one believes that I could possibly have measured it correctly and that it is smaller than the "standard" fittings. This in spite of my background in experimental physics, machining, and mechanics. That being said, I think that a 98 normally has the "standard" fittings so...

All the R-12 connections I have seen have had a screw on port. There is a label on the frame of the Explorer that states that it is 134a too. Yes, I know the low pressure vs the high pressure ports. One can never be warned too often about there difference. I used a caliper to measure the...

True, but untill I can connect my gauges to system I can't put in dye and/or sealer so I still need to find the correct fittings.

My daughter's 1998 Explorer's A/C compressor is cycling a bit. The air is still cool but should be colder. I went to add freon and found that the charging ports are smaller than the "standard" size. The ports on my 2000 ford truck and my wife's 2002 Explorer are what must be consider the...

Just a note to introduce me and my Explorers. I have a 2002 XLT with just about everything you might have heard about on it. My wife claims that one. My daughter drives a 1998 Explorer 2WD. All-in-all they have been great. Although not an Explorer, My ride is a 2000 SuperDuty 4X4 PSD...