Question about 2008 Ford F-350

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I have a 99 F-450 truck with a 6.8 motor. It just recently failed inspection for emissions was told I need to change coil packs but there is no check engine light on what do I look for?

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You need to check the inspection report, to see what the exhaust readings were. They may be a clue,to how you approach your troubleshooting

If,say the HC and O2 were high-Misfire as possible cause,from unburnt fuel
CO was high- rich condition

Check all basic stuff--Air Filter,Clean MAF Sensor, good spark plugs,install full synthetic oil,vacuum leaks,etc.

Posted on May 11, 2010

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Posted on Jan 02, 2017

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SOURCE: I have a 99 F-450 truck with a 6.8 motor. It just

it may have a dirty mass air flow sensor (MAF) and could couse a rich condition that would fail emissions test. it should throw a code but not always its a pretty delicate sensor and the contaminant may not b visible if u put an oil filter on it(K&N) if i use too much spray the sensor will malfuntion as it gets coated with oil. Gently remove the MAF from housing and spray the two sensor forks with carb n choke cleaner to remove contaminents.

Posted on Mar 17, 2010

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2 Answers

Why do new spark plug coils go bad ?


coils, it has just one coil pack. with 3 coils integrated.
its not COPs.
there are many DTCs related, and not posted.
did you try new spark plugs, then new wires. and then only last the coil pack? check compression.
is it failing the same cylinder? (the will fail in pairs, if the pack is bad)
the pack runs 2 cylinders at once (in series)
injectors leaking or clogged.
since you didnt show the symptoms, i cant help much.


how.?
1 month or 1 year?, or how many miles?
answer 1
time, heat,vibration, oil contamination. (pressure washing them)
not using the dielectric grease on the boots.
getting water in the wells over and over, causing flash over , and carbon tracking.
what make you think they are bad.???
my guess, is you see P03xx codes and assume the means bad coil.?
post symptoms.
post scan data, and DTCs.

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I have a 99 F-450 truck with a 6.8 motor. It just recently failed inspection for emissions, was told I need to change coil packs but there is no check engine light on, what do I look for?


it may have a dirty mass air flow sensor (MAF) and could couse a rich condition that would fail emissions test. it should throw a code but not always its a pretty delicate sensor and the contaminant may not b visible if u put an oil filter on it(K&N) if i use too much spray the sensor will malfuntion as it gets coated with oil. Gently remove the MAF from housing and spray the two sensor forks with carb n choke cleaner to remove contaminents.

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