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Misfiring cylinder 4 causing stuttering and vibration at 65.

Misfiring cylinder 4 causing...

Misfiring cylinder 4 causing stuttering and vibration at 65

Mechanic's Assistant: How many miles are on the car? Is it a steady misfire? Or random?

Well i bought it used. Have a newer engine but the car has 194000. I am assuming based on what I read. When I start from a light it is stuttering and vibrates on hwy but if i let off gas vibration stops. At idle it sounds great

Mechanic's Assistant: What is the model of your '65 Mitsubishi?

2004 montero full size ltd.

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

No nothing going to bring it to a shop

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Had a head replaced 3000 miles ago but on cylinder 1

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Answered in 4 minutes by:
3/22/2018
peterpete190
peterpete190, Auto Technician
Category: Mitsubishi
Satisfied Customers: 33,389
Experience: Auto repair Technician with 17 years experience.Past ASE and other 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.
I am here Sundays through Thursdays from around 5 am to 2 pm Mountain time.If you respond and I do not respond back right away I will do so as soon as I can.

Usually, a misfire on a specific cylinder at a higher speed like you see here is caused by a failing ignition coil or spark plug.In some cases, it can be a failing fuel injector causing this fault needing replaced.

What needs to be done from here is to have the spark plugs checked to see if #4 is cracked or damaged.If it is o.k. check for carbon tracking down the side of the ceramic part of it.If there is carbon tracking then I would replace the plug wire/boot to resolve this issue.If it appears the spark plug was not fired off properly this can be the ignition coil at fault.

If spark is found to be o.k. then the fuel injector for #4 needs to be checked/tested to see if it needs to be replaced to resolve this issue here.

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 ( should be a link to click on here or above).You can rate at any time and we can continue to work on your question as this will not close out your question.I work on delivering the best answer and help here but in some cases, it can be difficult to do without seeing the vehicle.

Thanks Pete

peterpete190
peterpete190, Auto Technician
Category: Mitsubishi
Satisfied Customers: 33,389
Experience: Auto repair Technician with 17 years experience.Past ASE and other certifications.
Verified
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Customer reply replied 5 months ago
Thanks Pete. That is exactly what I had planned to do before I take it in to the mechanic.

Your welcome

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Customer reply replied 5 months ago
I had to drive it like this on the Hwy for 4 hours. Everything else seems fine is this bad for the engine?

It is bad if you continue to drive it this way if as it can eventually plug up or cause damage to the catalytic converter with it needing replaced.

Thanks Pete

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Customer reply replied 5 months ago
Thanks Pete! No I have not driven it since I have had this issue after that trip. Should I be concerned about having to replace the cylinder or is this more of an ignition/fuel injector issue?

Your welcome

This is usually more of a fault with an injector or coil or spark plug issue.

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Customer reply replied 5 months ago
Thanks!

Your welcome

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