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Pete
Pete, Auto Service Technician
Category: Ford
Satisfied Customers: 24697
Experience:  Over 17 years diagnosing and repairing automobiles various makes and models with some training and certifications.
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What causes hesitation while driving. It has no check engine

Customer Question

What causes hesitation while driving. It has no check engine light on.
Submitted: 1 year ago.
Category: Ford
Expert:  Pete replied 1 year ago.
Hi,my name is ***** ***** I will be happy to try to assist you with this.I may need more information in some cases to help with answering your question.I apologize for any delay.
A dirty mass air flow sensor will cause this as well as low fuel volume due to a weak fuel pump or restricted fuel filter.These are the most common causes.
If you can tell me the year,make and model of your vehicle as well as engine size this will help.
Thanks Pete
Customer: replied 1 year ago.
2006 ford f150 lariat
Customer: replied 1 year ago.
5.4
Expert:  Pete replied 1 year ago.
O.k.,since this didn't trigger a check engine light the most common cause is the mass air flow sensor.It can become dirty and in some cases can be removed and cleaned to correct this fault by purchasing mass air flow sensor cleaner from a local parts store and in other cases it has to be replaced.The computer will see the false air flow signal from this sensor and think that the signal is the correct signal so it won't turn on the check engine light but does cause hesitation like this here.
Your mass air flow sensor should be located inside the engine air filter box and has two screws holding it in place that need removed to access and replace it.
Thanks Pete

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