OKAY so i took my IACV off both engines and compared them to each other - finding an actual diagram of the IACV hasnt been easy - during the comparison I noticed that the IACV Magnetic Tongue on #1 was slightly more closed that #2 and also cleaner. I then took off the IACV mag-elec connection and found the ability of the magnet to SLIP back and forth was impeded. the Magnet Tongue MUST be cleaned, ideally to a gloss shine. over time there is a build up of residue similar to other areas involved in coolant that may sit for a while. this build up causes issues with the opening and closing on a hotter engine.
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