I got an Email from NGK who claim that AC MR43T cross reference to NGK YR55, anyone use these?

Michael

WFT the two NGK plugs are different heat ranges...right from ngk.com

YR55

V-Power Plug, 14mm Thread Size, 11mm (7/16") Reach, 5/8" (16mm) Hex Size, Tapered Seat, Resistor, Solid Terminal Nut, V-Power (V-Grooved Center Electrode), .060" (1.52mm) Gap, Heat Range 5


BR6FS

Traditional Spark Plug, 14mm Thread Size, 11mm (7/16") Reach, 5/8" (16mm) Hex Size, Tapered Seat, Resistor, Solid Terminal Nut, .031" (0.8mm) Gap, Heat Range 6


Also attached a cross ref chart...MR43T = BR6FS
MR44T = YR5

I hear ya! It was a nitemare trying to get any help from NKG, THEY told me the YR5's and YR55's are identical except for the gap (40 thou for 1, 60 thou for the other) when I asked, I was told that the YR55's are DIRECT replacements for the AC MR43T, so......since they are supposed to be "identical" the YR5's should work as replacements too, right? NOPE!!! According to NGK, ONLY the YR55's are replacements for the AC MR43T??!!! LOL!!

I said "screw it" and just went into town and grabbed 8 new NGK BR6FS' plugs and spun them in, for what its worth they are EXACTLY the same size as the YR5's, but, are a little shorter than the AC's

IAC CON'T!

I pulled the air cleaner off and had another look, it appears the studs that protrude threw the throttle body and the air cleaner are not removeable? There is a heli coil on all 4 studs in the upper plenum, I did try spinning them out with the dbl nut technique, and tried vice grips and they didnt budge at all.

I took a pic of the throttle body and studs with the air cleaner off if someone wants to have a look, but, I dont know how to post "here" I can Email them if someone wants to post and/or have a look at it. I am out of options, to me, it APPEARS that I need to lift off the entire upper plenum to get to the IAC, but, I hope I am wrong!

ANY input welcomed and appreciated!

Michael

Any ideas????

Yeah, shoot me a pic at insptech at comcast.net , I am curious now. If you jave to lift the top it is pretty easy, I have done it like 4 times in an afternoon (don't ask). The only thing to be careful of is the seals between the 2 plenums, but if you break them they are like 3 bucks a piece.

Thanks! Will shoot a pic in the AM!

Pics sent, Thanks!

Michael

i would like to see too

[email protected]

Pics sent! If I need to pull the upper plenum, how do I go about it? Anything to watch for? (other than trying not to wreck the gaskets)

Thanks!
Michael