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2005 Colorado.Check engine light on. Code 5th cylinder

2005 Colorado.Check engine light...

2005 Colorado.Check engine light on. Code 5th cylinder misfire. Rough idle. Decreased mileage per gal. Decreased power. Strong smell of.gasoline. Spark plugs already replaced.

Mechanic's Assistant: Does the light stay on, or does it blink?

Stays on.

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

Am an old lady. Will have it fixed if cost effective

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

Spark plugs replaced.

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Answered in 6 minutes by:
2/8/2018
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 25,965
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is ***** ***** I'm here to help get your problem solved.

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Customer reply replied 4 months ago
Thank you.

Give me a few minutes to gather information, thanks.

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This can be caused by a few things, the most serious possibility is a valve problems which isn't unheard of on this engine. I'd start with a engine carbon cleaning procedure done to clean off any carbon deposits on the valves. A shop should do this for around $150, dealership might be the best option. If that doesn't help then next step would be a compression test to see if engine internals are good, if compression is low then you probably need valves redone which is about a $1500-$2000 job depending on where you go. If compression is good then problem is most likely injector or coil which would be about a $400 job. Let me know if you have more questions or if there is anything else I can do to help, thanks.

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Customer reply replied 4 months ago
No one told me this was a common problem with this vehicle. Researched myself on-line. Not notified by Chevy. Not told by mechanic when problem occurred. Feel betrayed. 108,000 miles. Truck should last longer. It seems this might cost more than truck worth. Then no no at to buy another.

There is a chance it is something more simple such as injector or coil so I wouldn't expect worst case scenario but I just wanted to let you know what worst case was so you were aware of all possibilities. Let me know if you have questions, thanks.

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Engine cleaning procedure often helps too which is why I recommend to do that before doing any extensive work such as a valve job.

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Customer reply replied 4 months ago
What would be the cause of the strong g gasoline smell ? I feel like I'm driving a bomb.

That would be due to fuel not being burned which could be because valve now allowing compression to build up enough for fuel to burn, coil not igniting fuel, or injector putting out too much fuel. Let me know if you have questions, thanks.

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Customer reply replied 4 months ago
Thank you. I had seen all these recommendations but no one had prioritized them the way you have. Have been afraid to drive it and afraid to fix it. One last question. Would you suggest dealer over other mechanic...cost etc?

I do think I'd recommend dealership, they will cost a little ore up front but have a better chance of correctly diagnosing problem and correctly doing engine flush. You may need to specically ask for engine flush if they do not recommend it. Let me know if you have more questions, thanks.

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Customer reply replied 4 months ago
Is engine flush the engine carbon cleaning?
it is, let me know if you have any questions.
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 25,965
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Customer reply replied 4 months ago
Thank you so much. You cleared it up for me. Wish me luck. Will let you go.
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