P1506 – Idle Air Control System Over speed Error

Rick — Sun, 13 Nov 2011 20:58:49 +0000

If you get this code on a Ford vehicle with the Duratec engine, don’t start with an idle air controller valve (IAC) replacement. This vehicle has a LOT of vacuum leaks and that can cause serious idle problems. Air leaks into the engine AFTER the MAF has already metered the incoming air. So the oxygen sensor sees a very lean exhaust. Since the vehicle is at idle, the computer tries to reduce incoming air by shutting down the IAC. Once it commands less air and stills sees an idle that’s too high, it sets a P1506 trouble code.

One of the common air leaks is in the rubber hose

PCV valve elbow

going to the PCV valve. The hose has a 90 degree bend in it and it tends to crack there. So START your diagnosis by replacing both the PCV AND the hose. Many readers report that Ford doesn’t stop this hose. If you can’t find it, check the link below. Since this part has such a huge failure rate, Dorman has stepped into the market with a replacement. Install the elbow, clear the code and then see if it returns.

Want more more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

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Ticking Noise from Engine – Ford 3.0 Duratec Engine

Rick — Tue, 25 Sep 2007 01:59:00 +0000

Some Ford 3.0 Duratec engines are exhibiting a ticking noise coming from the left cylinder bank after engine warm-up. Ford has isolated the problem to 2005-07 vehicles with cam driven water pumps. The ticking is caused by an improperly torqued exhaust camshaft. The fix involves removing the valve cover and re-tightening the exhaust cam bolts while pre-loading the #4 cam cap.

Here’s the procedure. Run the engine up to operating temperature and verify that the ticking sound is coming from the area around the #6 cylinder. (Use an automotive stethoscope for this) Remove the valve cover and rotate the engine by hand until both cam lobes for the #6 cylinder are pointing straight up. Next, remove all the exhaust cam caps and reinstall them with the bolts finger tight. Torque all the cam caps except #4 in the proper sequence to 72 inch/lbs.

Using two flat blade screwdrivers, wedge the flat tips under the inboard side of the cam cap and apply pressure to force the cap towards the exhaust side of the cylinder head. Holding the cap in this position with the screwdrivers (you may need a second set of hands for this part), torque the inboard cap bolt to 72 inch/lbs. Then tighten the outboard bolt on the cap to the same torque. Reinstall the valve cover.

Vehicles affected by this problem are: 2005-07 Ford Five Hundred, Freestyles, and Mercury Montegos. Also included are: 2006 Ford Fusion, Mercury Milan and Lincoln Zephyrs. Add 2006-07 Ford Escapes and Mercury Mariners to the list as well.

For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

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Both Alldata and Eautorepair offer professional grade shop manuals at a price you can afford. Check them out!.

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