Question about 2000 Mercury Cougar
First you need to reset the computer. Disconnect the NEG battery cable for 10 minutes, you could have fixed the problem and the old errors are still being reported.
If the same code resets, the problem is the vacuum passage below the airhorn. Usually this occurs on 4.6 V-8s, and it only requires removing the Airhorn and its' gasket and cleaning the groove beneath the gasket. Another possibility is the backflow airtube. This sits behind the engine and has 2 vacuum lines going to the EGR sensors at the back of the engine. If its rusted or cracked it will lose airflow and generate a code. JB weld may fix it.
The onboard computer only knows that the EGR flow is not good. The computer blames everything South of the EGR and they have nothing to check the airflow TO the EGR. The grooves under that Airhorn gasket provide the original flow.
I went through $420 worth of parts to no effect before I found a copcar municipal mechanic who clued me in on this.
Posted on Aug 31, 2010
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Posted on Jan 02, 2017
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