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Ask Eric Gardner Your Own Question
Eric Gardner
Eric Gardner, ASE Certified Technician
Category: Ford
Satisfied Customers: 228
Experience:  ASE Certified Automotive Technician with a Bachelor’s Degree in Automotive Technology
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Idle very rough and blue smoke and gas smell out tailpipe on

Customer Question

Idle very rough and blue smoke and gas smell out tailpipe on 2001 f150 5.4
Submitted: 1 year ago.
Category: Ford
Expert:  Eric Gardner replied 1 year ago.

Hello, and thanks for using just answer.

I would like to help guide you through the process of diagnosing your vehicle.

I have read your description of the problem, and from what little information I have this sounds like there is/are bad ignition coils that are bad. The blue smoke is unburnt fuel and that's why you sense the smell of gas emanating from the tail pipe.

There are 8 ignition coils on your engine so the easiest way to determine which of the coils are bad, you would need to have the the check engine light scanned. If you can retrieve the code by having the computer scanned by an autoparts store or a shop. Please let me know the code and I can guide you through the next steps.


Customer: replied 1 year ago.
Should I change spark plugs and injectors to
Expert:  Eric Gardner replied 1 year ago.

Lets not go that far yet. That would cost a ton of money and we just need to fix the fault causing the issue. If you get the vehicle scanned at an autozone to pull the check engine codes we can get this narrowed down and get this fixed fairly cheaply and easily. Let me know what you find regarding the codes. Thanks