Question about 2003 Lincoln LS

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I have a 2003 lincoln ls 3.9 v8 the code shows that I have a 8th cylinder miss and a bad o2 sensor can the o2 sensor make my car miss and it doesn't miss all the time either

I have replaced plugs

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A faulty o2 sensor will not cause a misfire. This is exhaust related, which is more than likely due to a clogged catalytic converter, which was is likely due to your misfire leaving unburned fuel to go to the exhaust, which clogs the catalyst. You likely smell a rotten egg type smell in the car at times. Your misfire is likely another cylinder. The OBDII codes are not great at finding the cylinder of the misfire in this particular car. Your best bet is to replace all 8 coils and plugs at the same time with OEM Motorcraft coils only. One bad coil makes the others work harder, meaning if you replace them one at a time, you will be constantly chasing a misfire.

Posted on Apr 14, 2014

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Posted on Jan 02, 2017

SOURCE: Engine sputter

2002 linclon ls 3.0 v6 pcv location

Posted on Jul 17, 2008

  • 4 Answers

SOURCE: cylinder location and firing order diagram for

have you considered buying a $14.oo haynes repair manual from Kargen or one of those type stores? If not just google your year, model and engine type and a diagram comes up

Posted on Aug 14, 2009

  • 2 Answers

SOURCE: I HAVE A 2000 LINCOLN LS. IT IS MISSING BAD AT AN

I have the same problem exactly,took it to repair shops replaced coils,egr, egr sensor, timing chains, plugs still no solution,my cylinder misfire is on #3

Posted on Mar 05, 2010

michigan man
  • 3533 Answers

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.

Posted on Mar 05, 2010

SOURCE: how to install upstream o2 sensor

You just unplug the wire connector and unscrew them with,a 22mm or 7/8" open end wrench.
I assume you mean, the one closest to the engine, on the exhaust pipe.
Put Permatex Anti-Seize on the threads.

Don't just change it because you got a code. The code may be set because you got a misfire,on a COP Ignition Coil
Your best bet is to put a scanner on the car and watch the O2 Sensor Data

Posted on May 17, 2010

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What is bank 1 for a catalytic converter for 2000 Lincoln ls v6


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There is no tune -up for your car

I have the same car ,V8 --- only spark plugs


You have a bad COP Ignition Coil -- give us the code PO301 thru PO308

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The EGR Valve could be an issue

Almost certain you will have 1 or 2 bad cop
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Could be several other problems

Need the correct spark plugs,they are special
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1 Answer

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The coil you did, may have been the one that
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Need more info on issue.

I want mileage , O2 Sensor info, Preventative
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Who has worked on it and who is currently going to
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1 Answer

The trouble code is P0303 on my 2003 LS V8. When engine on and gear in parking or neutral position engine working isn't optimal, it seems it hasn't enough rpms and the car is shaking a little. also the...


Disconnect and plug the vacuum hoses to the EGR Valve
and drive a few days.

I think your getting random misfires and the #3 is not
the issue,as you installed a new coil.

The PO300 codes on a L/S are not always an indication
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until I got the bad one.

Spray the MAF with CRC MAF Cleaner

If the O2 Sensors are around 100,000 replace
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order from NAPA,the connectors may be a different
color and they give you 5" too much wire but are the
OEM NGK Sensors.

Meter the TPS Sensor and If you have an
oscilloscope use that. KOEO work throttle plate
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1 Answer

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Thermostat
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It may be overheating due to coil misfires or other issues and ruined the
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You need to solve all issues before replacing a converter
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