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2004 5.4 ldles at 2000 rpm

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2004 5.4 ldles at 2000 rpm
Submitted: 10 months ago.Category: Ford
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Answered in 1 minute by:
10/4/2017
Ford Mechanic: Fix It Man, Master Technician replied 10 months ago
Fix It Man
Fix It Man, Master Technician
Category: Ford
Satisfied Customers: 17,611
Experience: ASE Master Certified, AA Degree Auto/Diesel
Verified

Hello my name is***** is usually either caused by a vacuum leak in the engine or a failing throttle body or idle control valve. I would first check the engine for any loose vacuum hoses. Listen for a hissing noise when the engine is running indicating a leak. If that is fine then I would typically replace the idle control valve and clean the throttle body to resolve this issue. Please let me know if you need more help.

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Customer reply replied 10 months ago
Professional mechanic. Stumped. Has IAC and mass air replaced. Tps reads .96 at idle sweeps fine to wide open throttle. Checked intake with carb cleaner no apparent leaks. Non EGR engine. No codes.
Ford Mechanic: Fix It Man, Master Technician replied 10 months ago

How does the throttle plate look at idle? Closed?

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Customer reply replied 10 months ago
if I disconnect the IAC idle will drop down to 500 RPM. If I introduce artificial Air at brake booster hose idle will increase. I'm fairly certain it's not a vacuum leak at that point.
Ford Mechanic: Fix It Man, Master Technician replied 10 months ago

Is this an F150? How long have you let it run after the IAC replacement?

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Customer reply replied 10 months ago
I think I hit the call button by mistake ignore that for right now. It is an E350. Has run for probably at least 15 minutes while testing.
Ford Mechanic: Fix It Man, Master Technician replied 10 months ago

Does it accelerate just fine?

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Customer reply replied 10 months ago
I never drove it myself customer had no complaint drives it on the highway for a work van.
Ford Mechanic: Fix It Man, Master Technician replied 10 months ago

What is the voltage at both pins of the IAC with the ignition turned on?

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Customer reply replied 10 months ago
11.6
Ford Mechanic: Fix It Man, Master Technician replied 10 months ago

And do they both remain that way as the engine is running?

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