Question about 2003 Lincoln Navigator

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How can you tell which catalytic converter is bad on an 03 navigator

Already replaced all 8 coil packs and a top hose keeps blowing off when going on expressway. car is still hesitating but running. was told the converter might be bad. problem is there are 4? Was told more than likely it was on drivers side.

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  • Lincoln Master
  • 14,333 Answers

You have 4 oxygen sensors,1 at each exhaust manifold and 1 after each catalytic converters.Usually a scan tool won't pin point which sensor is bad.It can get real expensive just replacing parts.The easy and cheapest way to find out is take to dealer for oil change and they will scan it for free and tell you what is wrong and the cost,you have option,to let them repair or fix yourself,now you know what is wrong,I take my Truck to dealer for oil changes to get free scan.

Posted on Jan 17, 2013

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 03 navigator Running board on driver side acts confused

There is a relay switch in each door. It is the relay in one of the the driver side doors. The switch is going bad.

Posted on Dec 29, 2008

  • 155 Answers

SOURCE: 2004 Lincoln navigator misfire on cylinder 8 error code p318

Replace the coil pack once more. I went through 2 new ones on my f150 on one cylinder. One worked, the other didn't (both new off the shelf). Condensation build up in the boot caused mine to misfire. Anytime you replace a coil pack, squirt a little silicone grease inside. This will prevent condensation from hitting your plug. Fords are notorius for this problem, especially if you live in a humid area. Also, make sure and clear the codes after you make the repair.

Posted on Jun 10, 2009

  • 5 Answers

SOURCE: my car sputters when accelrating and the check

Start with replacing all the spark plugs. Then drive. If it happens again it's your coils. Don't buy them used, and it's honestly better to buy them online from a website like partstrain.com or ebay.com. Dealership wanted 119.00 a piece, plus labor. I got them online, all 8 for a little under 450 after shipping. And it takes about an hour to do it yourself. All I can say is be gentle when getting the coils/plugs out.

Posted on Aug 08, 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

jim_james_43
  • 74 Answers

SOURCE: coil packs keep going bad when it rains

When they dry out, seal them with silicon... or some other like product.

Posted on Nov 24, 2010

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2 Answers

When i floor my 01 navigator it wont go it makes a popping sound in the throttle body


sounds like the cats are plugged up....remove the o2 sensors and see if it runs better. Mine would idle, but would pop and stumble when the gas was hit. Ran well for a long time but would stumble whwn floored, slowly got so bad couldnt drive it but it idled fine. Pulled the o2 sensors and started it up and all kinds of debris, junk, blew out. Replaced cats and o2 sensors and runs great. cost $2000.00 in parts.If you find that this is your problem, then check to see if the cats came apart and blew chunks into the muffler,,,,can cause a restriction and cook the new cats. Took me a lot of time to get this truck running right, but it sounds like youre dealing with the same issues..I went through the coil packs and chased engine codes for a week. Pull the o2 sensors and see what blows out; and if engine runs better.....hope this helps (spend some time pricing o2 sensors and y pipe with cars...you can save some $. good luck!

Mar 06, 2014 | 2001 Lincoln Navigator

1 Answer

I have a 2008 gt mustang why would it misfire on number 8 cylinder


Hi there:

May mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer


Possible Solutions: If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.


If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 09, 2012 | 2008 Ford Mustang GT

1 Answer

I have a 1998 f150 with a 4.6 v8, the code said the number 8 cylinder was misfiring, I have replaced the coil and the plug, what do I do now??


A code P0308 may mean that one or more of the following has happened:
Faulty spark plug or wireFaulty coil (pack)Faulty oxygen sensor(s)Faulty fuel injectorBurned exhaust valveFaulty catalytic converter(s)Running out of fuelPoor compressionDefective computer


Possible Solutions:If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps, also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Apr 16, 2012 | 1998 Ford F150 Regular Cab

1 Answer

02 mercury sable egr pressure feedback sensor keeps melting on the smaller vacuum side. And keeps blowing out smaller hose. Engine is running ok at idle but will not accelerate past 20 mph. What would...


Most likely it is the catalytic converter one the firewall side clogged. the part that melts is the exhaust feedback side and it backs up the hot air once the converter is clogged. I had same problem on 03 escape. Also resist putting straight pipe on downstream converter because it catches any loose carbon from going into the muffler. If the muffler is clogged it will do the same.

Aug 12, 2011 | Mercury Sable Cars & Trucks

1 Answer

Have a 03 dodge durango and have erratic idle, have changed plugs and coils, the 3 plugs 4,6, and 8 are fouled abd checked for vacuum leak get a p0300 code abd the check light blinks. help!!!!!


A code P0300 may mean that one or more of the following has happened:

  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • i would check the coils frist.goodluck hope its not that bad .

Jan 21, 2011 | Dodge Durango Cars & Trucks

1 Answer

My Navigator 2004 has code PO302, who can i fix this problem?


A code P0302 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Keep us updated (remember to rate this answer).

Jan 18, 2011 | Lincoln Navigator L Cars & Trucks

1 Answer

2000 ford focus I have to keep replacing the coil pk. also I have heat when I am driving but none when sitting. already replaced the therm. and flushed it, replaced lower hose to rad. what is causing...


motorcraft parts are recomended, though after market high end coils would also work, accel,MSD and such, when you replace are you getting them with a new resistor, as this can cause packs to blow also.
as for your heat not blowing check the water pump, sounds as though it may have broken free from drive internally and only when high rpm is creating enough friction to turn the internal fan.

Dec 22, 2010 | 2000 Ford Focus

1 Answer

4.7l V-8---error code P0308 is being displayed---about a year ago, I replaced the plugs and all 8 coil packs---thanks


Hi. This P0308 code means that the the PCM has detected that one of the engine's cylinders are not firing properly. In this case it will be cylinder Number 8.

A code P0308 may indicate that one or more of the following has occurred:

1 Faulty spark plug or wire
2 Faulty coil (pack)
3 Faulty oxygen sensor(s)
4 Faulty fuel injector
5 Burned exhaust valve
6 Faulty catalytic converter(s)
7 Running out of fuel
8 Poor compression
9 Defective computer

If there are no symptoms, the first thing to do is to reset the code, with a code reader, and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the affected cylinder and plug/coil assembly. Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs-COP-). In some cases, the catalytic converter has collapsed. If you smell rotten eggs in the exhaust, your converter may need to be replaced. I've also been told several times that the problem in this case could be a faulty injector at that cylinder 8.

Sep 04, 2010 | 2004 Dodge Ram 1500

1 Answer

I keep getting a coed of # 8 cylender missfire I have replace spark plugs wires and distributer cap ???


SymptomsSymptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes can mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Jul 13, 2010 | 1998 Dodge Ram 1500 4WD

2 Answers

We took our pick-up to the local Ford Dealership to find out why it was running so rough,especially when it was sitting still. It took 3-trips to the Ford House in one week before they could tell me...


The Ford guys you are going to are absolute morons. The engine light likely indicates misfire(s) codes. maybe catalyst inefficiency, but that would be due to the misfiring. Take it to a decent shop that has been in your area for a long time, tell them to tune it up and diagnose it properly. Ford trucks have a very common problem with bad coil packs and coil pack extensions. I can almost promise you this is your problem. Mention coil packs to the mechanic just to twig his memory and he can check his scanner for which ones are suspect.

Mar 30, 2009 | 2003 Ford F150 Regular Cab

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