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2002 Mercury Cougar XR
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Discussion Starter · #1 · (Edited)
Hello , new member here I’ve been doing a lot of digging around and I found this to the best spot for me to ask and get some opinions. I recently bought a Cougar 02 XR 82k miles and the engine light is on and I’ve been having some issues with it, first thing I noticed is that it was hesitating around 40mph / 4000 rpm . I’ve looked and it’s possibly the IMRC but I’m not sure.

Another issue I noticed ( First and Third Picture ) was the intake pipe was covered with duct tape so I took it out and it looks like they replaced it themselves I looked up stock year of the car it doesn’t look like this, but I did replace it. ( Fifth Picture )
Motor vehicle Vehicle Hood Automotive tire Car
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Codes
P0300 (Multiple Cylinders misfire)
P0303 (Cylinder 3 Misfire)
P0172 (Bank 1 too rich)
P0175 (Bank 2 too rich)
P1152 & P1132 ( I don’t know but research says Heated Upstream Oxygen Sensor Switch ) (HO2S?)

I’ve replaced the EGR sensor and MAF sensor.

I’m going to get a tune up Monday and honestly I’m not sure on what to do first besides spark plugs / wires if anyone has any suggestions that would be amazing. I’m honestly not very good with cars anything helps!
 

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1999 3.0 SilFro
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24,982 Posts
Coil pack as well. All at once.

Misfires will cause rich conditions. Start there.

The Duratec naturally has a weird little “bump” in the power band right at 3500-4000 when the IMRC switches over, but if it doesn’t continue to pull all the way to 6750 then it might not be opening.
 
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2002 Mercury Cougar XR
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2 Posts
Discussion Starter · #3 ·
Coil pack as well. All at once.

Misfires will cause rich conditions. Start there.

The Duratec naturally has a weird little “bump” in the power band right at 3500-4000 when the IMRC switches over, but if it doesn’t continue to pull all the way to 6750 then it might not be opening.
Do you have any preferred brands on plugs/ wires / coil pack?
 

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1999 3.0 SilFro
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24,982 Posts
Autolite or Motorcraft double platinum plugs - no substitutes.

Stock wires are best. Don’t cheap out and don’t try anything fancy.
 
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Premium Member
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You're on the right track. most of our stumbling and hesitation issues are related to vacuum leaks or spark.
Many of these cars have vacuum lines hodge-podged together like you're seeing. If you get all those lines in good shape and do an ignition refresh there's a good chance it will run like a whole different car.
The most common IMRC issue is lost bushings in the linkages below the throttle body.

Just be methodical and ask here for help if something doesn't seem right, you will get it.
 
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1999 3.0 SilFro
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24,982 Posts
I think I have NGK wires on mine, too. The last time I had ignition problems was when I installed a set of Ford Racing wires. Hot garbage.

I used E3 plugs for a while, but anything that isn't double-platinum can't stand up to the Duratec's waste-spark system, and will fail early.
 
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I have had the e3 for about 6months but will probably check them this weekend and see how they look. I tend to do a tune up at least twice a year since it's quite easy to do and also doesn't cost an arm and a leg to do. The main reason I use the e3 is because of the fact I use 93 non ethanol fuel and e3 burns hotter.
 

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Autolite double-platinum, and Magnecor wires, no issues. Definitely double-platinum plugs, though I suspect the platinum fine-wire plugs would work too, but have never tried them.
 

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Welcome, I just use motorcraft plugs and wires like Andy mentioned above. Never had any issues with those.

If you need any OEM parts for your cougar I have plenty of extra parts. I have a 2001 Cougar ATX 2.5L parts car. Just message me and I can try to get what you need. Thanks


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