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1993 Ford F-150 Base Styleside S/Special 117 WB

1993 Ford F-150
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January 29, 2013, 7:34 am

Patricia S
 

Question: How much should it cost to replace eight spark plugs in a 2007 Ford F-150?

Check engine light came on. The truck was taken to the dealership's vehicle repair shop to run a diagnostic. Per the service dept rep, the computer analysis will not reveal a problem with the spark plugs but they found a problem with the sparks plugs by checking the "internals". I don't understand the extent or purpose of attaching the computer systems (the vehicles to the service machine) if it cannot determine a spark plug issue given it is electrical. In addition, they stated the rack & pinon was showing signs of deterioration by the mechanic turning the steering wheel. Doesn't add up to me. Please explain how the spark plug can be determined as a problem o/s of the diagnostic and if the rack & pinon problem s/b shown on the diagnostic report.


February 9, 2013, 9:40 am

Elizabeth K
Expert Mechanic

Good questions, but they all require pretty lengthy responses. The check engine light monitors many (hundreds) of things, but it is a poor indicator of spark plug condition, which is more properly considered to be part of the ignition system. For your vehicle, you should replace spark plugs ~ every 100k miles, if you need them more often, then there is probably another problem causing that. Was there a diagnosis given for the check engine light? What was the code that it set? Without knowing more specifics, I cannot say if the spark plugs were a good diagnosis or not, but it doesn't sound likely.

Power steering rack? Usually those are considered bad when they leak, not by feeling for play. The belt, fluid and tie rod ends need to be inspected first, as they are all more prone to wear and causing problems than the rack itself.

For a 5 year old truck, the dealership is not a reliable place to get general repair work done. I suggest you find a reputable independent shop: cheaper repairs, and maybe you can find a technician that is willing to explain his work so you don't walk away feeling like you're being ripped off.


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