Question about 2003 Ford Expedition

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How do you know whens the cadilac converter is Bad/

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2 Answers

When it is 14 years old - you replace it

When it fails - you replace it -- AFTER you make sure you have no cylinder misfires,vacuum leaks & all data & sensors are okey

You have to look at scan tool data for the oxygen sensors

If the Emission Monitors do not run--that is a key

If you have O2 Sensor Codes-you check switching times with
an oscilloscope,especially if the front to rear switch bias voltage
is not with range. (that is what sets the PO420 & 430 OBD Codes)

On your vehicle-- I can tell you it is unlikely the spark plugs have been changed & not every 3 years
Also the ignition coils fail on Fords after 6 to 7 years-then you get
cylinder misfires that ruin the converter
Some 5.4 motors had leaking injectors-they take out a converter in a couple months

My suggestion:

New Spark Plugs
8 New COP Ignition Coils
New Front Oxygen Sensors-at 100,000 miles
New Exhaust Converters
Mail away your 12 year old injectors to be tested &
Ultra-Sonically Cleaned
Clean MAF Sensor

Not knowing about vehicles & the required Preventative
Maintenance, is why you have those problems

Posted on Nov 18, 2014

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  • Contributor
  • 31 Answers

Loss of power and some times overheating

Posted on Nov 18, 2014

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I had to have cadilac converter taken off car, I have a code that says Map Sensor and 02 sensor..is this due to the converter missing now? and does that affect the performance of the car in anyway?


The codes your car are throwing up and important codes to get fixed. The O2 sensor code is there because the cadilac converter was removed. The O2 sensor measure the amount of oxygen present in the exhaust both before the cadilac converter and after. When the measurments are the same the computer knows the cadilac converter is not working properly and it turns on the Check Engine Light. This code in itself will not effect the performance of the vehicle in any way OTHER then emissions. This is bad for the environment and if you live in a place that requires emission testing you will fail and eventually your resignation will be revoked making it illegal to drive that vehicle. It is illegal for a shop to remove the cadilac converter without replacing it so I recommend you avoid that shop in the future. There is a $10,000 fine if they are caught **** this.

The code for the MAP (Manifold Absolute Pressure) is completely unrelated but this code WILL effect the fueling and thus performance (both power and fuel economy) of the vehicle. The computer uses this sensor to get an idea of how much vacuum or suction the engine is using to pull fresh air into the combustion changer and then decided how much fuel to add. Its important that the proper amount of fuel be added to keep your engine running well. I highly recommend either doing some testing yourself or have a shop address this issue. MAP sensor are quite cheap and easy to replace. If you are not good with a multimeter then I would just replace the MAP sensor and see if it goes away. If you feel up to it you can check the resistance and continuity of the wires connecting the MAP sensor to the PCM. If you would like I can provide you with step by step instructions and wiring diagrams as well as pin out so you can test this. Good luck and thank you.

~Kyle~

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It will smell like rotten eggs and/or it will glow red when hot

May 14, 2011 | 1995 Subaru Legacy

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How do u know its your front or back cadilac converter if its plugged


Disconnect the rear one from the front one and run the engine to determine if performance improves. if it does then replace the rear one. If little or no improvement is noted then replace the front one.

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Cadilac converter i went out we had it tested at some auto store can u tell me how hard it is to replace


Most are welded in and have to be cut out. Stock converters can be expensive so I would recommend talking to muffler shops to see if they know of replacement ones that will still let you pass inspection.

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When I start the truck it only runs for a minute or two then dies and won't start again for a while and it floods I have replaced the ignition coil module dis. Cap & rot. Button


i recall two other similar experiance with to different vehicles ur cadilac converter may be clogged the would cause this problem or ur air filter may need changed and if ur blazer has a mass air flow senser could be goin bad

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