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840 or 808

2353 Views 7 Replies 6 Participants Last post by  2048 Demon, 
1 DEMON
Had my dealer install the crate PCM and high octane button. When I put 100 octane in or 93 octane in, it shows up in blue light that 840 high octane activated. Why would it show that with only 93 octane?
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1 DEMON
THEONE said:
Have you ran all of the 100 octane out? It could still be reading the mixture as being 100 octane.
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Yes. I ran the 93 octane down to empty, then filled up a full tank of 100 octane. Could there be something wrong with the crate PCM?
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