Question about Lincoln Navigator

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2006 Lincoln Navigator hesitation problem

I have a 2006 Lincoln Navigator that hesitates/pulls back when driving. Went to a mechanic and they told me that one of the spark plugs broke when they were looking at it so they needed to replace it and that I should replace all the plugs and coils for like $1800. Told them I would go somewhere else and they charged me $350 for the one spark plug, coil and labor. Car continued to hesitate. Put in fuel injection cleaner and car was running great for a week or so then started hesitating again but not as bad. I was told by someone that I should have the 02 sensors replaced. Brought it down to another local mechanic who said that if the fuel injection cleaner made a difference it couldn't be the 02 sensors and that I would probably need a new catalytic convertor which would cost around $1500. Does any of this make sense? Should I have the 02 sensor replaced first and then see if it is the catalytic converter? Why do I need to be charged for just having someone look at my car to figure out what is wrong?

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1 Answer

Why are you charged for someone to look at a vehicle?

Well-- they have decades of knowledge & training & about
$100,000 in tools & test equipment

Just like your doctor charges you $220.00 & the staff does most
of the work before the doctor comes in & no one questions those fees

On that vehicle & that 5.4 V8 motor you had to remove the odd two
piece spark plugs the day you brought it home form a dealer or they
freeze in the head & about 3 break off

There are a couple of tools for removing the plugs
They cost about $70.00 & are on amazon & all tool sites
That job you can do yourself for the price of the tool

Champion makes a one piece spark plug

Lots & lots & lots of info on the internet on that spark plug issue

All was avoidable if the plugs were replaced the first couple months
it was new

On to Oxygen Sensors--The front 2 only get replaced at 100,000
miles on ALL Vehicles

The COP Ignition Coils on a ford only last 6 to 7 years so their
done & most likely have been misfiring for years & RUINED the
Exhaust Converter

ALL you have been told is true, just not explained properly,or why
your not knowing what vehicles require in the way of Preventative
Maintenance actually caused the issues

As they say, you bought it, you drove it, & it is up to you to use the
internet before & during ownership to educate yourself

I've typed enough for now & will say the prices you were given
were just short of fraud & non sense

You can go to Rock & look up the spark plugs (champion)
Wells Coils (8) & Walker Pipes & Converter if necessary & your
around $1000.00 in parts --normal wear & tear actually for an 8 year
old vehicle

The 2004 thru 2006 5.4 had injector leaking issues
Most on the 2005 model year those can ruin a converter

IF you PAID a shop once or twice a year to go WITH YOU &
your driving & they take along a scan tool to look at data you
can stay on top of how the motor runs & (again) avoid most

Posted on Apr 01, 2014

  • Anonymous Apr 01, 2014

    Let me add NO Mechanic should be giving out any advice until you pay & they test things Then you have mileage,vehicle history & fact based test results Any professional that tells you that injector cleaner works is an imposter ,not need nor does it work in 18 gallons of fuel,apply the laws of physics

  • Anonymous Apr 01, 2014

    Would appear they asked you very little in the way of vehicle maintenance or history,didn't drive it with scanner to look at data & don't know much about fords or at least how to talk to a customer



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