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Mountaineer

On cars built after the late 1990's, replacing an ECU is a much bigger deal than just plugging in a new box. The ECU has to recognize the serial number of the car and the other modules in the car....

For this 2004 year Mercury Mountaineer they were only equipped with a 5R55S transmission for the 4.0 and 4.6 liter motors. The only different transmissions would be for rear wheel drive or all wheel drive. They are both 5R55S base...

There can be many reasons for an engine to stall. Since the Check Engine Light is on I would start with scanning the computer for codes and moving forward with a diagnosis from there. You may have a vacuum leak...

Hello there, thank you for asking about your 2007 Mercury Mountaineer. This is a fairly common issue on many cars. Your car is equipped with a V-8 motor which has two separate "sides" of the motor where the cylinder heads...

Hi Moo. Thanks for contacting us today. It is possible that an inner transmission failure has occurred, or perhaps (and more likely) that an issue with the differential is the source. The best way to determine what is causing the...

If the vehicle is 4 wheel drive, it sounds like it could be stuck in 4WD. Another possibility may be that the differential i stuck in the locked state if it is equipped with this option. Lastly, you may want...

Hi there. It's possible that you're not using the correct coolant or the right ratio of coolant to distilled water. Unless the coolant bottle says "pre-mixed", it's likely that you're adding straight coolant instead of a 50/50 ratio of coolant...

It should be safe to drive a short distance to purchase a Mass Air sensor. As long as the engine is not stalling or overheating and take it easy driving you should be fine.

This could be a result of the brake caliper sticking. A few different things can make the brakes stick or lock up. The master cylinder may be causing this if it has not been properly bled. If you loosen the...

If wheel bearing is in need of replacement on this vehicle then you will need to replace the entire hub assembly with it since it comes as an assembly incorporated with the speed sensor.

This vehicle engine has a manual throttle cable and cannot accelerate by itself. You may have a faulty idle air control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) that can cause a high idle but is limited to only about 1250 rpm. I would recommend...

It is not good to hold the steering all the way to the left or right against the stops. This can stress the power steering components. Some shaking at the stops can be normal. I would ask for help from...

This may be related to many different possibilities, some of which may be related to a lack of spark and some of which may be related to a fuel delivery problem or a combination of both. For example, if the...

Hello, it sound like your automatic transmission is having a mechanical problem internally. The first thing to check is the transmission fluid level and condition. If the level is low, top it up, check the fluid condition, it should be...

Hi Grace. Thanks for contacting us tonight. We are a bit confused by the description of your vibration; so let's provide a bit of detail for you. If the shaking occurs when you are fully stopped, then the shaking issue...

Hi Mushi. Thanks for writing in today. Sometimes the initial diagnosis based on the error code is not the actual source of the problem. In the case of the P0401, the code (https://www.yourmechanic.com/article/p0401-obd-ii-trouble-code-exhaust-gas-recirculation-flow-malfunction-by-jay-safford) indicates that that the engine control module...

You have a leaking rear a/c heater system core or hose for the rear unit. You will need to keep the rear heater turned off and keep coolant in the engine full to prevent overheating the engine. Have the cooling...

Hi there. I wouldn't assume that you have a coolant leak based on coolant being present after the vehicle overheated. In most cases, the coolant will boil out of the radiator cap and cause this type of 'spillage'. If you've...

Hi There, Code P1450 relates to the EVAP system in your vehicle and us unrelated to the power train malfunction you are referring to. Your car has a small purge valve with a purge solenoid (https://www.yourmechanic.com/services/evaporation-vent-solenoid-replacement) in the Evaporative Emissions...

There are reports of failure, and consequent leaks, of these plastic manifolds. Indeed, there was a settlement involving a range of Ford products years ago. However, looking at NHTSA (http://www.safercar.gov) data and other sources, I cannot find evidence of any...