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Old 09-25-2016, 08:01 PM   #7
LuvNLife
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Join Date: May 2010
Location: Crossville, TN
Posts: 142
Re: Truck has started running rich & terrible MPG

I only mention this because it happened to me once.

On the back of that cheap tach you have, should be some sort of switch. This selects 4, 6 and 8 cylinder engines. You may have to Google the brand to find out more info, but I had one set for a 6 cylinder by mistake, and got crazy high readings like you.

I might be all wet, but it's worth a look...

Jerry
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