I have a 2004 Lincoln LS 3.9L V8 that has been misfiring lately (rough Idle and hesitant acceleration). The CEL came on 2 weeks ago and I had it ran through diagnostics at Advanced Auto Parts and it came back with P0355/Ignition coil E. I had the #5 coil replaced and it ran smoother for about 5 minutes after I left the shop that was in the process of closing for the weekend. The CEL came on again a few days after that and I just had it ran through diagnostics again with the same code. Any thoughts on what it could be? The part is under warranty at the shop so I am getting replaced again on the house, but what do you think the chances are that it was just a bad part? I have read a lot about the bad valve cover gaskets so I am going to have them check to see if there is oil or anything in there. Does anyone have any idea approximately how much I can expect to pay for this at a mechanic if it is indeed the valve cover gaskets?
I have the same car, I bought new
You don't need a shop to work on that issue
You go to Rock Auto.Com & buy about 6 Wells
COP Ignition Coils for about $50 verse $70 at parts store
You only need a 7mm socket to remove the coil covers &
one screw holding any coil you wish to change
I realize you don't have professional tools as I do,or all the
experience with the LS coil issues
I have replaced coils based on a code, which should be PO 301 thru
PO308, not the 355 & letter stuff, although there the same thing, just not
on an LS
I have used scan tool software in Mode #06 to find bad coils
The third & most time consuming way, is what you do & I have had
to do also & the reason the dealers & shops can't resolve the issues
at times
You start with a new coil in the cyl with the PO Code
If you get codes again or many codes & you will,you replace the old
coil & walk the new one to another cyl
Why--because a really bad coil will act up whenever it wants to,once
ever 3 weeks,2 weeks,at every stop light one day & then gone for weeks
I have seen people on this site spend up to $2500 at a dealer with no fix,
when one 50 dollar coil & half hour of your time was the fix
A bad coil will put you into ETC Failsafe & you can't go over 6 mph,that
is the way the system is designed
Better yet- for another $1200 a dealer installs a new throttle body for
no reason ,other than they don't understand the very product they sell
& service
The mechanic I brought it to couldn't figure out what coil was truly bad. He said that it kept coming back with a different cylinder misfiring including the one that was just replaced. Stupid question #1: If I were to do it myself and just straight up replace all 8 coils, would that fix the issue to the best of your knowledge? I know its not really cost effective, but I would like the piece of mind that its fixed. Also, is this an issue that I can expect to see often even after all have been replaced and is there something preventative that I can do to possibly keep it from happening?
Oh and stupid question #2: is it a possibility that once I pull the coils that I could go to a place like autozone and test them to see if they are good?
Replacing 8 coils yourself you get from Rock Auto is better than a professional that can't diagnose a ford I explained that to you Follow my story about on what to do The new coils may fail in 18 months ,one or two or last 8 years as the oe ford ones did The only way to test COP Coils is on the car as I said in Mode #06 with a scan tool or the correct way is to current ramp the primary side of coil & use an oscilloscope on the secondary. If the coils only fail when they feel like it like some of mine did you won't have the test equip with you when it shuts off So walk new coils or install several The shops certainly have no idea how to fix any ford with these coils The best part is that they have been on most V8 Ford since 1996 joke isn't it at the customers expense & a Lincoln Dealer can't resolve either because of the way they test in the service bay.
All vehicle or most have the same individual coils so the repair shops better get with the program,& stop changing TPS Sensors & $700 Throttle Bodies for no reason Also most fixes for most vehicle issues are here on the internet solved already Just Google your problem & find out what has been resolved in the last ten years
Do you know why the ignition coils go out as often as I have read that they do? Is it just ****** factory coils or a design flaw of some kind?
Those coils do last 6 to 10 years the factory ones but they have been on mosr fords for 15 years or more & no solution There ar emany other issues with ford products from 1997 thru 2006 or later they never change the design of a part until the next new things & then they fail
I don't have an answer as to the longevity of the aftermarket coils Just part of todays technology so you keep learning You need to do a lot more today than 20 years ago with any vehicle. You simply can't just drive them untill they need sonmething fixed because you don't know what to do then Have to practice your skills on a working vehicle & be ready
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SOURCE: Lincoln LS idle problem
Hello
The engine
and transmission in this cars drive train are fully
electronically controlled by a computer called the PCM (Power Train
Control Module). Whenever a problem like this occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump for instance) in the form of a fault code
in its memory, to read these fault codes you must have the systems
memory scanned with a special tool. Once the fault code(s) are read
you then must perform the appropriate diagnostic testing to find and
resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE
DIAGNOSIS & TESTING IS COMPLETED.
SOURCE: 2001 lincoln ls v8,rough idle and misses under load
you may need to check the cowl pack that sits on top of the plugs and check all of your vaccum lines give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.
Misfire is almost always bad spark plug and/or ignition coil. I wouldnt trust an OBDII scanner to correctly diagnose which cylinder is misfiring. Your best bet is to replace the coils in all 8 cylinders (or 6 if its a V6) since when one goes out it makes the others work harder, meaning that they arent far behind
P0305 is a misfire code in cylinder 5. Not sure whether you have a v6 or a v8, but regardless, this car in particular goes through ignition coils pretty quickly. The best way that I have found to deal with a misfire code is to change all 8 ignition coils and spark plugs at the same time. Make sure that you use only Motorcraft coils as the PCM does not play well with after market coils. rockauto.com has them for around $50 per coil
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Also you replace the front oxygen sensors at 100,000 miles Rock Auto again & the OE NTK Brand You must use the NGK OE Factory Spark Plugs also every 3 years All the part # are on the rock site or I will give them to you Work on your own car People don't like or understand fords
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