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The engine starts to misfire when accelerating i figured it…

Customer Question
The engine starts to...

The engine starts to misfire when accelerating i figured it was the fuel filter

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

It's my daughters car - i dont know if its using a lot of fuel - starting seems fine

Mechanic's Assistant: What is the model/year of your Jeep?

2007 jeep patriot

Mechanic's Assistant: Are you fixing your Patriot yourself? What have you tried so far?

I was going to start by changing the fuel filter

Submitted: 1 year ago.Category: Jeep
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Answered in 4 minutes by:
3/29/2017
Jeep Mechanic: Pete, Technician replied 1 year ago
Pete
Pete, Technician
Category: Jeep
Satisfied Customers: 31,719
Experience: Over 17 years diagnosing and repairing automobiles various makes and models with some training and certifications.
Verified

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

If this feels like a possible lack of power before right before the misfire occurs here this can be caused by a fault with the fuel filter being restricted or a weak fuel pump.I have also seen a restricted catalytic converter cause misfires at higher speeds or when accelerating.There is also the possibility of one of the ignition coils starting to break down internally under acceleration.I have seen all of these cause this issue here.

If you replace the fuel filter and it does not correct this fault here if the check engine light is on with this issue the first thing that should be done is to have the fault codes checked/read out to see what codes are set with a compatible scan tool.Once this is done any codes set need to then be diagnosed to locate and repair this fault here.

If the check engine light is not on then I would have the fuel pressure tested ( this will require a fuel pressure test gauge) to see if the fuel pump is weak needing replaced.If this is o.k. I would have the ignition coils tested to see if one is cutting out under load as well as an exhaust back pressure test done to see if this is a restricted catalytic converter possibly.

But usually with what is described this is a lack of fuel or an issue with a coil failing needing replaced.A higher end scan tool will help to pinpoint which cylinder(s) are misfiring by observing the data misfire display on it which will help locate if you have a failing coil.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service,your 5 star rating is appreciated.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

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Pete
Pete
Pete, Technician
Category: Jeep
Satisfied Customers: 31,719
31,719 Satisfied Customers
Experience: Over 17 years diagnosing and repairing automobiles various makes and models with some training and certifications.

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