91 Cougar LS 5.0 Teardown and Build

[Zep5.0]

There were other cars with EVO but in the 5.0 variety it may well have been unique to the MN12s. Although are 3.8 PS pumps the same? All SCs had EVO

If rock auto is correct, they are different.

 

[MadMikeyL]

SC pumps are different, but the EVO is the same. Let me look and see, I think I have an SC pump here I can pull the EVO off of and send to you if you want to try swapping that out.

 

[Zep5.0]

SC pumps are different, but the EVO is the same. Let me look and see, I think I have an SC pump here I can pull the EVO off of and send to you if you want to try swapping that out.

I would appreciate that. Thanks!

 

[Grog6]

We must have the only cars with the valve on the pump? I've been searching for a couple hours and can't find any. Id just hate to buy another pump for the EVO and then that is my problem. I can try to clean it, but I see it going badly

The evo unscrews from the pump, and then you can disassemble it, to see if the coil is smoked. It's obvious when it's bad. I have one apart, it came from the pump I killed with the line mod. adapter went too deep.

 

[Zep5.0]

Drove it a bit today. I finally fixed my idle issue. Turns out I had 2 wires backwards on my IAC. I was finally able to get the idle down to 800rpm. Unfortunately I think I went. Touch too closed on the throttle blade, so I need to adjust that a touch. That should get my IAC% down at warm idle. I think that was part of running warm last weekend.

One thing I believe I'm missing is an air dam between the bumper cover and the lower radiator support. Is this where an upgrade was a grand am dam? If so, I may have found one. https://ebay.io/m/1AxEBD

Back to the power steering pump. I ran it with the EVM unplugged today and didn't mind it at all. I didn't notice it overheating, but the leak is still there. I think I have no choice but to pull it and see if the housing is cracked.

Funny part of the day. My wife had her first ride. She asked me if I like the back side of the hood, which is seen from inside the car. AKA, she thinks it's stupid. She didn't say so, but it's not my first rodeo...

 

[XR7-4.6]

Drove it a bit today. I finally fixed my idle issue. Turns out I had 2 wires backwards on my IAC. I was finally able to get the idle down to 800rpm. Unfortunately I think I went. Touch too closed on the throttle blade, so I need to adjust that a touch. That should get my IAC% down at warm idle. I think that was part of running warm last weekend.

One thing I believe I'm missing is an air dam between the bumper cover and the lower radiator support. Is this where an upgrade was a grand am dam? If so, I may have found one. https://ebay.io/m/1AxEBD

Back to the power steering pump. I ran it with the EVM unplugged today and didn't mind it at all. I didn't notice it overheating, but the leak is still there. I think I have no choice but to pull it and see if the housing is cracked.

Funny part of the day. My wife had her first ride. She asked me if I like the back side of the hood, which is seen from inside the car. AKA, she thinks it's stupid. She didn't say so, but it's not my first rodeo...

The Grand Am air dam is a little different from the stock setup in that rather than mounting it to that core support area utilizing the same mounting points as the bumper cover itself, you actually mount it further forward mounting it to the bumper cover itself behind the openings, theoretically cramming the most air possible into the rad/condensor.

I have found this very effective at keeping it cool well into triple digit heat, but I also cut mine down a bit from stock, lopping off the flappy ends and taking about 1/2” off total height which I think looks better and is no less effective for the job.





Your wife and I share the same passive aggressive sentiment for the aesthetics of cowl hoods but your setup at least needs it!

 

[Zep5.0]

The Grand Am air dam is a little different from the stock setup in that rather than mounting it to that core support area utilizing the same mounting points as the bumper cover itself, you actually mount it further forward mounting it to the bumper cover itself behind the openings, theoretically cramming the most air possible into the rad/condensor.

I have found this very effective at keeping it cool well into triple digit heat, but I also cut mine down a bit from stock, lopping off the flappy ends and taking about 1/2” off total height which I think looks better and is no less effective for the job.

View attachment 18969



Your wife and I share the same passive aggressive sentiment for the aesthetics of cowl hoods but your setup at least needs it!

If I could have kept the stock good I would have. I've thought about putting it on just to see how close it would be. A custom "bump" wouldn't be so bad if it was small. But I don't have funds sitting around for any more custom stuff at this point.

So you still have the stock deflector in there as well?

 

[XR7-4.6]

If I could have kept the stock good I would have. I've thought about putting it on just to see how close it would be. A custom "bump" wouldn't be so bad if it was small. But I don't have funds sitting around for any more custom stuff at this point.

So you still have the stock deflector in there as well?

Nope the stock deflector would be redundant, I just reused the plastic push pins to hold the bumper cover to the core support there, but the rest is gone

 

[Grog6]

Oh yeah! the evo has an optical rate sensor on the column,
under the dash. it gets spiderwebs, and shuts it off. canned air cleans it.

 

[theterminator93]

So, what I've been waiting for are the numbers. These are corrected numbers, as he runs a Mustang Dyno.

419 wheel, assuming 20% driveline loss is 523hp at the crank. My hope was 500, so this meets that criteria. It started to rain when I got home, so I'll see what it feels like another day.

Make sure you cross-post that to the Dyno section too.