2001 Lincoln LS V8. Engine missfire and p0174 Code. Please Help!!!

jjcool00 said:
Leads me to believe you have a clogged catalytic converter
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with a clogged cat, it would run worse as the RPM climbed and needed to flow more volume of air. if a cat was clogged to the point that it caused the engine to run poorly, it would straight shut/choke the motor out much higher.
 
OP, when was the last time you changed the fuel filter on that 01, if it hasn't been changed by yourself, I'd replace it asap. if it's restricting flow it could be contributing to your lean condition.

I'd also be double checking further for leaks, using an unlit propane torch to prospect for such.



A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.

more ... http://www.aa1car.com/library/ford_lean_codes.htm


EGR valve is not closing, flow is faulty ?
 
1LoudLS said:
with a clogged cat, it would run worse as the RPM climbed and needed to flow more volume of air. if a cat was clogged to the point that it caused the engine to run poorly, it would straight shut/choke the motor out much higher.
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When my cat was clogged, my car ran exactly as he describes. Lower RPM/speed it was worse, higher RPM/speed it was fine. Mine never cut my engine off but several times at low speed it felt like it wanted to turn off. It also threw a lean code.
 
jjcool00 said:
When my cat was clogged, my car ran exactly as he describes. Lower RPM/speed it was worse, higher RPM/speed it was fine. Mine never cut my engine off but several times at low speed it felt like it wanted to turn off. It also threw a lean code.
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Fuel Filter was just changed fuel pressure is all good. The engine is missing from both sides of the engine. both exhausts are "put put put" theres no cross over pipes or x pipes so if it was a clogged cat it would only miss on one side of the motor
 
ecarlincoln said:
I must be wrong, I could have sworn I looked and it was a true dual.
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It's a "true dual" in my opinion, but there should be a small section just ahead of the resonators that allows the exhaust from both sides to mix. This makes the exhaust "draft" better (perhaps there is a better word for it).

It's easy enough to test. Just block one side of the exhaust.
 
jjcool00 said:
If the first gen is anything like the second it goes, manifold > cat x2 > x pipe > 2 outlet pipes > two mufflers.
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it is, they are almost exactly in the same configuration, the only difference is some have a third cat/crossover, some just have a stamped plate where that cat would be, and i guess there are some without even the plate at all (just two separate pipes)


I am uncertain if they all had the crossover tube in the rear, I swear I've seen pictures of both on here. but do not know for sure...






jjcool00 said:
When my cat was clogged, my car ran exactly as he describes. Lower RPM/speed it was worse, higher RPM/speed it was fine. Mine never cut my engine off but several times at low speed it felt like it wanted to turn off. It also threw a lean code.
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thats so weird. my car did the exact opposite. you could start the car and it could run for 5-10 minutes before the pressure got too high and it choked the motor out, but if you started it up and revved it or tried to drive it, it would choke out in 60 seconds or less depending on how high it was revving.
 
1LoudLS said:
thats so weird. my car did the exact opposite. you could start the car and it could run for 5-10 minutes before the pressure got too high and it choked the motor out, but if you started it up and revved it or tried to drive it, it would choke out in 60 seconds or less depending on how high it was revving.
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Don't ask me but my experience was like this: Got lean codes assumed no big deal and reset the code. After a week or so it started idling funny. Didn't think anything of it. Then it felt like it had a misfire, but at low speeds/rpms. Sometimes when turning it felt like it lost power. When I floored it or was on the highway it was perfectly fine. It got worse and worse as time went on, til eventually it threw the dreaded cat code... P0420. Then I replaced with magnaflow cats and had no issue afterwards. Guess not all clogs are created equal.
 
Well got some bad new on the LS today, Mechanic said one side of the engine is misfiring at low rpm's and hes suspecting either timing has jumped a tooth or the chains severely stretched. Ive been looking but cant seem to find any timing chain write ups?
 
I thought I replied to this but i guess not lol. Mechanic said one side of the engine is misfiring at low rpm's hes suspecting either that side has jumped time or the chain is so stretched its causing this issue. My question is, is it possible that if i pull the valve cover and verify timing is off, Can i change the tensioner and line that cam back up? I realize i should just change the chains but im leaning towards going to the lincoln dealer and trading it in after the winter.
 
jjcool00 said:
Don't ask me but my experience was like this: Got lean codes assumed no big deal and reset the code. After a week or so it started idling funny. Didn't think anything of it. Then it felt like it had a misfire, but at low speeds/rpms. Sometimes when turning it felt like it lost power. When I floored it or was on the highway it was perfectly fine. It got worse and worse as time went on, til eventually it threw the dreaded cat code... P0420. Then I replaced with magnaflow cats and had no issue afterwards. Guess not all clogs are created equal.
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My bad cat was about the same. Started with code for a bad coil, then I got the O2 sensor code & then within a couple weeks it idled rough & ran terrible at low rpm or under load going up hills, but still ran like a champ on the highway. I had 4 new O2 sensors & was just waiting on a full Mangnaflow exhaust to show up, so I wasn't concerned about it getting worse. When it finally went to the exhaust shop, they confirmed the cat on the driver side (which was the side with the bad coil & O2) was clogged.
 
Rancor Keeper said:
Started with code for a bad coil
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that is exactly how most cat failures happen...

the coil misfires, then fuel is not burned and is throw out of the motor where the hot exhaust/cat ignite the fuel. burning fuel in the cat melts down the inner material then the cat is clogged.
 
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