Question about 2000 Mercury Cougar

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I am experiencing engine hesitation on my 2000 Mercury Cougar 2.5L. I've since changed Coil park, wires, plugs, O2 sensors, Transimission speed sensor, changed Trans Oil, Fuel pump, EGR valve, air flow sensor, air filter, cleaned injectors. Today, another mechanic thinks cylinder 2 & 3 are not firing. What is your opinion?

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  • Primcast Jun 22, 2011

    akkvghiu: Thanks for the effort made to help, but unfortunately, the links you provided weren't working. Can you please indicate the solution by typing them up for me?
    Best regards.

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Is the check engine light on

Posted on Jul 03, 2011

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Ford mercury cougar with the code p0301 whats dose this mean


A P0301 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

A code P0301 may mean that one or more of the following has happened:
Faulty spark plug or wire
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Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope helps.

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Have a good day !

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2000 mercury cougar hesitating/jerking


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Much luck

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1 Answer

2000 mercury cougar hesitating/jerking


First, disconnect neg battery cable 10 minutes and reattach to clear codes.
Lean condition means it is not getting same fuel as other side of engine.
Since you had it scanned before, try Autozone to see if new results.
You might try a TPS switch which regulates spark and fuel feed. At lower speeds EGR starts to open-you should have code for a problem there.

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O2 sensors on a 99 mercury cougar v6


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Vehicle speed sensor


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