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Mike V.
Mike V., Infiniti Mechanic
Category: Infiniti
Satisfied Customers: 23827
Experience:  Factory trained to repair Nissan and Subaru.
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I have a 2002 q45. If I give it the gas slowly its fine. If

Customer Question

I have a 2002 q45. If I give it the gas slowly its fine. If I step on it it just keeps bucking. Idles a little rough.
Submitted: 11 months ago.
Category: Infiniti
Customer: replied 11 months ago.
it has 120000 miles
Expert:  Mike V. replied 11 months ago.

Hi there,

Is the check engine light on when this is happening?

Customer: replied 11 months ago.
no
Expert:  Mike V. replied 11 months ago.

Ok, this issue is usually a problem with the mass air flow sensor. If you unplug it and start the truck and the idle is smoother it can be a good basic test. Usually though the best test is to have a scan tool that can see the live data from the maf sensor. This may also be a problem with your fuel pressure and fuel pump, but it's been my experience that it's typically a mass air flow issue. This can fail without setting the check engine light. All it has to do is read wrong and it will cause this type of problem.

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Thank you so much!