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All started when i had plugs changed.started

Customer Question
All started when i...

All started when i had plugs changed.started misfiring.changed 2 coils still misfires and pops and bangs from exhaust

Mechanic's Assistant: Where exactly do you think the noise is coming from? And how long has this been going on?

Started 1 week ago and drives rough lack of power

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

350z 2002

Mechanic's Assistant: Are you fixing your 350Z yourself? What have you tried so far?

Injection cleaner new plugs and changed 2 coils mechanic said they had failed

Submitted: 11 months ago.Category: UK Car
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Answered in 47 minutes by:
9/13/2017
UK Auto Mechanic: Peter Zavarelli,
 replied 11 months ago
Peter Zavarelli
Category: UK Car
Satisfied Customers: 33,405
Experience: Technical Consultant at Just Answer
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.

The popping and banging from the exhaust with this misfire issue can be caused by an injector or more then one injector atomizing incorrectly not allowing enough fuel which can cause a misfire and the lean back fire issue.The other issue is a burned or damaged exhaust valve in a cylinder head.If you have not had a compression test done this needs done to see if any cylinders are found to be low on compression at all.If any are found to be low on compression then the affected cylinder head will need removed and the valves checked for any damage.

If compression is found to be o.k. I would have the injectors tested to see if they need to be professionally cleaned or the affected injectors replaced.

If this only occurred after the spark plugs were changed I would have the spark plugs checked to see if any were cracked when they were installed or damaged as well as the spark plug gap checked to make sure none are mis gapped causing 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.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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