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Discussion in 'Ford Trucks' started by james.j.smith, Jan 31, 2011.
I have a 1991 ford 250 5.8L what is the correct idel speed for this truck?
I would guess around 750 RPM's. That info is on the under hood decal. You can not just adjust it either. You need to follow the specific procedures to set the idle speed.
The Idle Air Control and the Throttle Position Sensor determine your idle speed. Your fuel pressure regulator can effect it too. If it lets too much pressure to the injectors. Other sensor can effect it too. It just depends on what the problem is.
I just changed the IAC and I'm ideling around 1000 rpm I was wondering if that was to high
I would think that's too high. Take the vacuum hose off the fuel pressure regulator when it's running. If the idle increases it's working if not that could be the problem. High fuel pressure or no vacuum to it. If you have the can style vacuum reservoir it may be rusted out.