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2000 Ford Windstar P1506 Code: Idle Air Control Overspeed Error After Intake Gasket Replacement

Model: 2000 ford Windstar Fault Code: P1506 Posted: 2007-11-06 21:19

I recently replaced the intake gaskets and bolts on my 2000 Ford Windstar, which has a two-piece plastic intake manifold. Shortly after reassembly, the check engine light came on, and my OBD2 scanner now displays fault code P1506 — Idle Air Control (IAC) Overspeed Error. I'm not sure what went wrong during the repair. I've already double-checked all vacuum hoses and connections, but the issue persists. Could this be due to improper reinstallation of the intake manifold or a missing vacuum line? What are the most common causes of P150-than normal idle, and how can I troubleshoot it effectively?

Related fault codes
P1506
Comments (8)
Anonymous 2007-11-07 08:11

What does the P1506 error code specifically mean in terms of vehicle operation?

Anonymous 2007-11-07 08:43

P1506 stands for Idle Air Control Overspeed Error — this indicates that the idle air control valve is running faster than intended, often due to vacuum leaks or unmetered air entering the intake system.

Anonymous 2007-11-07 09:20

It's likely you left a PCV hose or another vacuum line disconnected. A vacuum leak can cause the engine to idle higher than normal, which is a common trigger for P1506. Please carefully re-inspect all connections and ensure every vacuum hose is properly attached.

Anonymous 2007-11-07 19:42

I’ve already checked all hoses — none appear disconnected. I’ll go over them again to make sure everything is correctly routed. Thanks for the tip!

Anonymous 2007-11-08 16:11

No vacuum leaks detected during my inspection.

Anonymous 2007-11-09 08:03

It's highly probable that the intake manifold was not reinstalled properly or a vacuum hose was left disconnected. This is one of the most common causes of P1506 in 2000 Ford Windstar models.

Anonymous 2007-11-11 13:09

Could improper torque sequence be causing this? What’s the correct torque specification for the intake bolts? Can I reuse the new bolts, or do I need to replace them entirely? Are there other things I should check before reassembling? Thanks for your help.

Anonymous 2007-11-11 19:47

The intake bolts are reusable. The recommended torque range is 80–100 inch pounds for the lower bolts and slightly less for the upper ones. Torque sequence isn’t usually the issue — just ensure cross-torquing is used. As for why you replaced the gaskets, could you confirm if there were any prior DTCs before this repair? First, double-check all hose routing and connections by comparing them to the vacuum schematic on the hood decal. Verify air intake clamps and fittings are secure. If the issue still persists after these checks, consider disassembling the intake again to ensure no gaskets or components were misaligned. All P1506 causes relate to vacuum leaks or unmetered air — focus your troubleshooting there. Good luck!