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I have a 2004 jeep grand cherokee special editon 4.7 v8. Got a reading of a p171 fault code. What could cause this. Jeep was running fine filled it up then the gas mileage started to decline rapidly and was idling rough put some lucas in it and cleared the code. Light came back on cleared it again and it has not come back on again but when at 45 to 50 and sometimes at idle there is a humming noise

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I looked up the code and it said p171 was a lean air mixture.
Lucas could help if it were a clogged injector.

Lucas Fuel Treatment
Lucas Fuel Treatment is formulated for both gasoline and diesel engines, carbureted or fuel injected. It gives your fuel system what it really needs - a blend of super slick oils and additives with a high detergent action that allows the engine to operate at maximum efficiency. Also, it cleans and lubricates the carburetor and injectors and causes the fuel to burn more thoroughly for increased power and less fuel consumption. Lucas Fuel Treatment should definitely be used in vehicles that require leaded fuel because it actually replaces the benefits of lead in gasoline without causing harmful emissions. Use it to pass smog tests. Finally, it totally neutralizes the harmful effects of low sulfur diesel fuel.
I have a 2004 jeep grand cherokee special editon - btn_read_more_off.gif
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I do not know what the humming noise would be, exactly. It's kind of hard to diagnose without hearing what and where.

However, I would check all fluid levels to make sure that they're ok, as a start.

Posted on Jul 13, 2010

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Posted on Jan 02, 2017

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