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Old 07-11-2018, 12:38 PM
tommurtha tommurtha is offline
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what replacement plug for MCX

I currently have ac delco 91-932 platnium, that evidently is no longer available, napa can't seem to find a replacement. they gave me a 41-980 which looks the same but I leery. Any inputs. internet
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Old 07-11-2018, 05:11 PM
trunderw trunderw is offline
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I replaced my 41-993's with 41-101's. Apparently that's what GM is currently recommending -- per Indmar. I suspect that if you email Indmar they'll tell you what to use. They did for me.
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Old 07-11-2018, 06:17 PM
tommurtha tommurtha is offline
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Indmar was useless.. The guy said it doesn't take platinum despite the manual They gave me a std copper number. He did pass me off to Larry and I left a voice mail.. So far no response but has only been about 5 hours.
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Old 07-11-2018, 06:21 PM
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CantRepeat CantRepeat is offline
 
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Remember, it makes a difference if you have a MEFI4 or MEFI 5 with CATs as to which plug the MCX takes. Likewise, it also changes the plug gap.
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Old 07-11-2018, 10:00 PM
trunderw trunderw is offline
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Quote:
Originally Posted by tommurtha View Post
Indmar was useless.. The guy said it doesn't take platinum despite the manual They gave me a std copper number. He did pass me off to Larry and I left a voice mail.. So far no response but has only been about 5 hours.
Yeah it was Larry that gave me the intel. Had a response next day. Good point above about the cat. I gave Larry engine details and that's what he recommended.
Prior plugs had nearly 700 hours and looked good. I'll check a few new ones in a few months to see how they're doing.
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Old 07-11-2018, 10:39 PM
tommurtha tommurtha is offline
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Larry from Indmar did get back to me. He said there was no reason to use a platinum plug and gave me a standard plug number. This , despite the 2004 dated manual calling out platinum. He did also give me a platinum number to use if I chose but he emphasized it was wasted money. The platinum number was AC 41-101, the non was MR43LTS
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Old 07-12-2018, 08:17 AM
snork snork is offline
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a trusted MC mech and service mngr said he use the mr43lts on the mcx with cats
I recently replaced my plugs with the mr43lts and all is good
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Old 07-12-2018, 10:06 AM
tommurtha tommurtha is offline
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actually Larry said the OPPOSITE, your number is for without cats
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