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Old 03-01-2009, 18:02   #1 (permalink)
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Navigator issue, spark plugs?

Today while driving on the highway I've noticed that there was lack of power at WOT and it seemed like something was cutting the power (car was almost jerking), but when speeding up slowly everything was fine.

I tried the same from a stop light, if accelerating "normally" everything was fine but if I pushed the gas pedal down there was hesitation..then later check engine light came on.

I had similar problems with a few different cars before and it was always spar plugs/cables..does this sound like same problem?
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Old 03-01-2009, 19:09   #2 (permalink)
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Re: Navigator issue, spark plugs?

The 'check engine' light means that a trouble code has been detected. If you do not have access to an OBDII code reader, some parts stores will scan the codes for free. Read the codes, and post them in this thread.

OBD-II Trouble Code: P0171 System Too Lean (Bank 1)

Do the symptoms presented with this code sound familiar?:
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
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Old 03-01-2009, 19:25   #3 (permalink)
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Re: Navigator issue, spark plugs?

That sounds right, when driving normally everything is fine, I only notice problems (lack of power/hesitation) at WOT (when accelerating rapidly).

I'll go to the dealer tomorrow so they can check the code.
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Old 03-01-2009, 19:48   #4 (permalink)
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Re: Navigator issue, spark plugs?

Before going to the dealer, perform the MAF sensor cleaning steps in the following link. A dirty MAF sensor will set trouble codes that may be corrected with a simple cleaning of the sensor. This may not solve your problem, but it is preventive maintenance. The F150 is similar to the Nav:

How to clean the MAF (Mass Airflow Sensor) in a Ford F150
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Old 03-01-2009, 19:51   #5 (permalink)
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Re: Navigator issue, spark plugs?

I'll try that first tomorrow. Is there another name for the electric contact cleaner?

I guess places like princess auto should carry that?
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Old 03-01-2009, 19:56   #6 (permalink)
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Re: Navigator issue, spark plugs?

I'm sure most/all parts stores carry electric contact cleaner.
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Old 03-01-2009, 20:09   #7 (permalink)
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Re: Navigator issue, spark plugs?

Thanks for all your help!
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