High Idle above 3k - Error Code 51

[dlfred]

Originally Posted by cre

Other suspects are the air bypass / mixture screws on the AFM and on the throttle body... the are NOT user serviceable so naturally every dimwit f@cks with those first. Then the coolant temp sensor, A/C signal, vacuum leaks, stuck ISCV, bad AFM.?

How would you tell and what would you do "if" someone messed with the non-serviceable screws?

Originally Posted by cre

Coolant blowing out the reservoir? If not a bad radiator cap and not over heating, I've got some bad news for you. Test the coolant's pH for signs of exhaust gasses getting blown into the coolant system and check the oil for signs of condensation or thinning from fuel. Did you get the block and head resurfaced? MHG or OEM composite HG

I picked up a new cap last night. I have not had any water in the oil nor does it blow smoke from exhaust. I did get the head resurfaced but not the block. I believe it was a OEM style gasket.