How to repair issue below?

2006 Mercury Mariner 3.0L, after reaching normal temperature, starts a continual, erratic drop in rpm due to IAC valve slamming shut. White/red lead has a continuous 12V, other lead has 10V and intermittently loses voltage enough to see meter needle move. Can Hear Valve slamming even better with air filter holder open.

My car has 141500 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
You probably have a faulty idle air control valve that is not adjusting properly as the engine reaches operating temperature. Sometimes these valves can be cleaned to reduce the amount of carbon built up inside of them, but replacement of a faulty valve usually comes soon after anyway. Consider hiring an experienced technician like one from YourMechanic who can come out for a closer look and offer a more personal diagnosis of your rough/low idlle situation.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Mercury Mariner won`t start are a dead battery, an alternator problem, or failed starter.
Product Details. This is a repair service for a 2005-2006 3.0L Mercury Mariner PCM (Power Control Module), ECM and or ECU that has been damaged by failed ignition coils and spark plugs.
2006 Mercury Mariner Recall


What to Know About 2009 Mercury Mariner Scheduled Maintenance. You want your Mercury Mariner to last as long as possible. With the right maintenance at the right time, your Mariner has a good chance of hitting 200,000 miles or more.
A cracked, clogged, or otherwise worn fuel pump is often the reason a Mercury outboard cranks but won`t start. Consult a repair manual for your engine model and year to determine the proper replacement part.
Dirty or damaged spark plugs make it difficult for your engine to crank. Inspect your spark plugs and replace any spark plugs that are broken or dirty. If the spark plugs in your marine engine are improperly gapped, this can also prevent your boat from starting by delaying engine combustion.
Check the voltage of the battery in the PCM using a multimeter. Set the multimeter to DC volts and connect its probes to the battery terminals. The reading should be around 12V. If it is lower than 10V, then check for any loose connections or other issues with the power supply before proceeding further.
How much is a 2006 Mercury Grand Marquis worth? The value of a used 2006 Mercury Grand Marquis ranges from $847 to $5,291, based on vehicle condition, mileage, and options.
At present, Mercury product brands include Mercury, Mercury Racing, MerCruiser, and Mariner outboards (sold outside the U.S.). Outboard sizes range from 2.5 horsepower (1.9 kW) to 600 horsepower (450 kW).
The estimated cost to maintain and repair a Mercury Grand Marquis ranges from $95 to $2264, with an average of $256.
The most common reasons a Mercury Mountaineer won`t start are a dead battery, an alternator problem, or failed starter.
Check Your Starter

If you hear a clicking sound or a low whine when you turn the key, the starter solenoid may be the issue. Before having a mechanic take a closer look, first try the old method of tapping the starter motor lightly with a hammer before turning the key again.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Car jerks when accelerating in reverse & makes grinding noise. Is this a transmission or computer issue?
ANSWER : Hi there. Typically when you hear a grinding noise when you move forward or in reverse it’s usually an indication of a gear fault either in the transmission or another driveline component. If this occurs only when in reverse, it’s likely a damaged reverse gear. It is also possible that it’s a hydraulic fluid issue not supplying enough lubrication or pressure inside the lines to fully open the gear. I would recommend having a professional mechanic come to your location and complete a car is hard to shift inspection, so they can diagnose the source of your issue and recommend repairs that should resolve this problem.

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How do I tell the difference between an alternator issue and a starter issue?
ANSWER : If the starter motor is turning the engine over at adequate RPM, then you definitely do not have a starter motor issue. Even if you had a bad alternator (and the alternator should absolutely be tested, certainly when you install a new battery because you want to be sure the charging function is working properly) that would not prevent the car from starting. So, if the starter is turning the engine over, but the motor won’t run, you have either a fault in the fuel or ignition systems, or the air induction system. To "quickly" determine if it is a fuel system problem, you can try introducing starter fluid into the intake while cranking and if the vehicle starts at that point that would be an indication that you have, at least, inadequate fuel delivery perhaps due to a fuel pump issue. The most efficient approach to getting this resolved is to just simply request a no start diagnostic and the responding certified mechanic will make quick work of this for you. At the conclusion of the diagnostic he will let you know of the fault and the cost to repair. Please let us know how we can best assist you to get your vehicle running properly.

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looking to buy a 2016 Mazda 6 but concerned about the repair cost of the" I loop" fuel system and other unknown costly repairs. I
ANSWER : All issues that appear to be common throughout a particular model would be something of concern. I would recommend having any vehicle that you are considering purchasing thoroughly inspected by a professional. If you’d like, a certified YourMechanic technician can come to your location to perform a standard 75 point safety inspection on the vehicle in question and give their recommendation.

Another very important thing to consider would be to get a long warranty on the vehicle – preferably bumper-to-bumper. A bumper-to-bumper warranty for a long period of time will ensure that anything that happens to the vehicle will be covered under warranty.

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If we have a diagnostic done and then decide to have you do the repairs, do you then subtract that amount from the repair amount?
ANSWER : Some customers have obtained a diagnostic of their vehicle’s problem already and thus will just request a specific repair directly. Of course, no vehicle can be repaired without performing a diagnostic, a service that sometimes involves relatively complex test equipment and highly specialized training. All mechanics, whether mobile or shop based, distinguish between the cost of diagnosing a fault and the actual time or labor cost to repair the fault once it is identified. To illustrate, imagine a circumstance where it takes a Mechanic 2 hours to pinpoint an electrical fault in a car’s complex wiring system that is ultimately found as a simple short circuit due to a 3 inch section of frayed wire. Once found, that repair takes literally 15 minutes due to the inherent ease of just replacing a short segment of wire but, keep in mind, it took 2 hours to find it. Would it make sense to bill this as a 15 minute "repair" job, keeping in mind it took 2 hours to perform all the painstaking, tedious circuit traces, that is the diagnostic, to just get to the fault? Whatever diagnostic you request, you can be sure that the responding certified mechanic will get your issue taken care of for you promptly and professionally and answer, in person, any additional concerns that you might have. In the meantime, if you have further questions or concerns, do not hesitate at all to re-contact YourMechanic as we are always here to help you.

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I have a leaking power steering hose according to my dealership, they said it would take 5 hours to repair and cost $843.00, $800
ANSWER : Hi there. It would probably benefit you to obtain a second opinion. Although the power steering system can take time to prime and replace a hose, that estimate of labor is rather high; but expected by a dealership. If you’d like, you can request a quote to have one of our mobile mechanics complete a power steering pressure hose replacement to compare with the dealership.

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My Engine Light has started been displayed since i had my AC repaired. Is it any issue?
ANSWER : The check engine light comes on when the Electronic Control Unit (ECU) has detected a fault and stored a trouble code. The only way to know what is the problem is to scan the ECU with the proper diagnostic equipment. It could be that a sensor wire of some kind was disconnected during the repair on your AC. Or it could be totally unrelated to your AC Repairs. Your car has enough years and miles on it that you will be seeing the check engine light from time to time. Usually the issue that first Presents on a Honda is an oxygen sensor. To find out what is going on, contact Your Mechanic. They will send a technician to your home or office to scan your Honda and let you know what it’s going to take to put that light out.

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Are fuel injector banks and catalyst converters considered different issues and warranties?
ANSWER : Question sent to CS for warranty information regarding fuel injectors and catalytic converters for a Chevrolet 2010 V6-3.6L.

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If I book a repair with you does your repairs come with a warranty?
ANSWER : Yes, repair work is guaranteed. The complete terms of YourMechanic’s warranty are within this Warranty Document. Broadly, all labor on repairs and the replacement parts themselves are covered by a 12-month/12,000-mile (whichever comes first) warranty. Subject to certain conditions, if any defects in workmanship arise within this period, YourMechanic will work with you to resolve the issue at no additional cost. Please note that if you ordered a repair service, but YourMechanic did not first perform the diagnostic that substantiates the repair that you ordered, the warranty only covers defects in the replacement parts that you purchased. To illustrate, let’s say you ordered a new battery because your car would not start, but you did not have the "no start" condition actually diagnosed by YourMechanic, if after the new battery is installed by YourMechanic the car still does not start, the warranty does not cover the "car not starting event". The new battery is covered though, of course. If after a mechanic performs a service, you have reason to believe the services caused other problems, the warranty will be voided if you hire another mechanic (outside of YourMechanic) to inspect or work on your car. If we send a mechanic to inspect the car and the inspection demonstrates that the problem was indeed caused by the previous service, then the mechanic will fix your car at no cost to you. If the problem was caused by other reasons, the mechanic will bill you for the inspection or any further repair services provided by him or her. The warranty document at the aforementioned link provides additional details but the bottom line is yes, subject to reasonable exceptions, any repairs performed by Mechanics dispatched by YourMechanic are covered for 12 months or 12,000 miles.

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