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- - Erratic Idle (https://www.v8miata.net/ford-v8-discussion-29/erratic-idle-2719/)

SteveP

01-15-2016 08:04 AM

Erratic Idle

I have a basically stock 5.0 engine (mild cam upgrade) in a 92 Mazda Miata. The car starts well and idles a little rough at 700 rpm. Driveability is good, but when the car warms up, the rpm hangs between 2000 and 2500. Installed a new IAC, no help. Car is a 5 speed with A9P EEC. Any suggestions would be greatly appreciated.

Gunpilot

01-15-2016 07:10 PM

Adjust or replace TPS?

charchri4

01-18-2016 11:20 AM

I'd bet a vacuum leak in one of the systems that is temperature sensitive like the canister purge or EGR.

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