01' Lincoln LS V8, My check engine flashes when I get on the gas, then when I come to a complete stop it goes away. I just changed my O2 sensor before the cat, then cleaned my MAF semsor. I already cleared codes P0174, P0153/4 before my CEL started flashing, I have a K&N air filter (cone). I might have over oiled my filter but I need to know just in case. Thank you
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Re: Check Engine Light
Scan the computer again for codes. driving the car with flashing ck engine lite is damaging the valves and the cat converters. any po300,1,2,3,4,5,6,7,8 codes indicate that cyl. #misfire. most likely plugs and/or coils. if the po174 is back i would take a look at a possible vacuum leak in engine somewhere. the o2 sensor could have fixed the 153/4 but still could be more
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The 3.9 L V8 Lincoln LS does not have a PCV valve. There is a tube on the drivers side of the engine that goes from the valve cover/crank case to the air intake and this is what performs the crankcase ventilation. There is no valve to change
A flashing check engine light is generally for a really bad, active misfire that is causing unburned fuel to go into the Catalytic Convertor. Without a code, I cant really point you in the proper direction to fix it. I would recommend getting it professionally looked at very soon, or if you or a buddy know how to work on an engine, go to one of your local auto parts stores and have the code pulled for free to at least give you a decent idea of where to go. Given that you are driving a Gen I LS (I am assuming the 3.9L V8) coils and plugs are probably the most likely culprit (and possibly valve cover gaskets). There is also the possibility that the plastic tensioner for the timing chain has broken, causing the timing to go bad.
It's your Cat. I promise you I hads the same thing happen to mine and was told it was just my heat shild but if that was the case then it would raddle all the time I thought then when I got a new cat it all stoped
i just had mine fixed for that very same problem YESTERDAY.....you have several "coils"/sparkplugs that should be replaced....MISFIRE....you should have it put on a machine that will read which one it is....problem targeted. The best thing to do though is change all of them. they break 1 after the other. i replaced 2 within 3 months. Later i decided i didn't want to go have it done once a month, so i bit the bullet and spent the money.....