Problems with my Ford Escape

Zack

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2002 Ford Escape 3.0L V6 150k on it
Ive never had an issue with this thing til yesterday.
Out of nowhere it starts running rough.
I find Cylinders 4 and 6 are dead.
So, I moved coil packs around, no change. I swapped plugs around, no change.
Compression test = pass
I even pulled the coils and watched the plugs fire outside the engine.

Both the upstream and downstream O2 sensors are stuck on .6v at idle for that bank.
The fuel trims are about -15% on both banks.

I am stumped.

Any insight is appreciated.

PS. I washed the engine a few weeks ago and have driven the car around a few times since this happened. I took all connectors apart, cleaned them and re-installed to rule that out. I also wiggled all wiring and the idle never improved.
 

rdsnake

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Those escapes have problems with the cats plugging up. Try removing the o2 sensor and doing a back pressure test.
 

Mook

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#zacksescapeisapieceofshit
 

Zack

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Those escapes have problems with the cats plugging up. Try removing the o2 sensor and doing a back pressure test.
Ive been told the same thing you are telling me.

Cant i just look at the cat to see if its glowing red?
 

rdsnake

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I doubt the cat will be that hot to visually see it. You could also drop the cats but as I recall they are part of the exhaust manifold and not easy to get off. Exhaust pressure gauge would be the easiest. All you need a o2 fitting with a nipple and a rubber hose, hooked up to the a normal pressure gauge. Does the car have low power with no check engine light?
 

Zack

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I doubt the cat will be that hot to visually see it. You could also drop the cats but as I recall they are part of the exhaust manifold and not easy to get off. Exhaust pressure gauge would be the easiest. All you need a o2 fitting with a nipple and a rubber hose, hooked up to the a normal pressure gauge. Does the car have low power with no check engine light?
It has almost no power to get out of its own way and doesnt throw any codes.
 

rdsnake

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100% sure it's a bad cat. Computer has no way to measure delta pressure pre and post cat. I'd skip diagnosis and get a plan together for cat replacement. Fuckers aren't cheap last time I looked.
 

Zack

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100% sure it's a bad cat. Computer has no way to measure delta pressure pre and post cat. I'd skip diagnosis and get a plan together for cat replacement. Fuckers aren't cheap last time I looked.
Thank you sir.

The day all this happened was the day I planned on cleaning it up and making a for sale ad.

WTF.
 

rdsnake

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Yeeeah isn't how it always goes! Lol
 

wolfe

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How would a bad cat make the cyl dead? I can understand it runnin like shit, but those cylinders should still fire.
 

l0wb00st

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2002 Ford Escape 3.0L V6 150k on it
Ive never had an issue with this thing til yesterday.
Out of nowhere it starts running rough.
I find Cylinders 4 and 6 are dead.
So, I moved coil packs around, no change. I swapped plugs around, no change.
Compression test = pass
I even pulled the coils and watched the plugs fire outside the engine.

Both the upstream and downstream O2 sensors are stuck on .6v at idle for that bank.
The fuel trims are about -15% on both banks.

I am stumped.

Any insight is appreciated.

PS. I washed the engine a few weeks ago and have driven the car around a few times since this happened. I took all connectors apart, cleaned them and re-installed to rule that out. I also wiggled all wiring and the idle never improved.
First thing i'd do is Check the Injectors. A missfire will cause the fuel trims to go negative
 

rdsnake

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How would a bad cat make the cyl dead? I can understand it runnin like shit, but those cylinders should still fire.
The Cylinders are not "dead". They are working like they should. Coils are firing and compression is good. When you have a bad cat, it's the same as a plugged exhaust. If the exhaust cannot escape the cylinder it works as a restriction, a huge one at that. It cannot push the Exhaust gas out fast enough and bogs the engine down. A lot of off road people run into and cars with bad cats lol. I've only seen the problem 3 times. 2 escapes and 1 GTO.
 

wolfe

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The Cylinders are not "dead". They are working like they should. Coils are firing and compression is good. When you have a bad cat, it's the same as a plugged exhaust. If the exhaust cannot escape the cylinder it works as a restriction, a huge one at that. It cannot push the Exhaust gas out fast enough and bogs the engine down. A lot of off road people run into and cars with bad cats lol. I've only seen the problem 3 times. 2 escapes and 1 GTO.
Ok, that I understand. I was just confused because in the first post he said that cylinders 4 and 6 were dead. So I figured they weren't firing.
 

Eagle

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Quit ruining my idea, ZACK! :rofl: Touche though... touche.
 

Flyn

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The Cylinders are not "dead". They are working like they should. Coils are firing and compression is good. When you have a bad cat, it's the same as a plugged exhaust. If the exhaust cannot escape the cylinder it works as a restriction, a huge one at that. It cannot push the Exhaust gas out fast enough and bogs the engine down. A lot of off road people run into and cars with bad cats lol. I've only seen the problem 3 times. 2 escapes and 1 GTO.

I was at the Forest Preserves one time with my GF and an old couple were trying to get their car started. It would sputter, run really rough for a second then die. I saw the guy had been backed into a spot by a hill and looked at his exhaust. It was plugged with dirt and clay. I told him to wait a minute and used my knife to cut the stuff out.

Of course he tried to start the car while I was doing this and blew the rest of the junk in my face. Thanks old man. Car ran fine after this and he and his lady friend drove off into the sunset.
 

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