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I have an 04 3.5 altima, it has a rough idle ,but smooth off…

Customer Question
Hello, I have an...

Hello, I have an 04 3.5 altima, it has a rough idle ,but smooth off idle, service eng. soon light is on, it has over 200,000 miles on the eng.,replaced plugs and coil packs also booth cam sensors, please help,

Mechanic's Assistant: Is the rough idle intermittent or consistent?

Consistent

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

Yes, new plugs, coil packs,cam sensors, rear valve cover that was leaking

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

Thats about it

Submitted: 8 months ago.Category: Nissan
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Answered in 3 minutes by:
12/11/2017
Nissan Mechanic: nelson freitas,
 replied 8 months ago
nelson freitas
Category: Nissan
Satisfied Customers: 121
Experience: AutomotiveTechnician at brantford toyota
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Hello, and thanks for using JustAnswer, my name is ***** ***** I have been an Automotive Technician for over 15 years.

are you able to check which codes are stored in the engines computer?

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Nissan Mechanic: nelson freitas,
 replied 8 months ago

ok great, which codes did you find?

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Nissan Mechanic: nelson freitas,
 replied 8 months ago

I am sorry but I am unable to take any phone call requests at the moment

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Customer reply replied 8 months ago
scan indicates P0300,P0011 ,P0021
Customer reply replied 8 months ago
scan codes are P0300,P0011,P0021
Nissan Mechanic: nelson freitas,
 replied 8 months ago

so the P0300 code is for the random misfire from the rough idle.

Now the rough idle is caused by the other 2 codes. those are for the intake valve timing.

And first thing I would like to to check would be the oil level and condition. both of these use oil pressure to control them and if the oil is the wrong grade or too low you will have lower oil pressure at idle and the pressure will increase with rpm causing them to actuate properly.

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Customer reply replied 8 months ago
Ok, will change oil and hopefully this will fix my problem, Thank You
Nissan Mechanic: nelson freitas,
 replied 8 months ago

no problem, let me know if you have any other quesitons.

Can you please rate my services today, Your honest feedback is appreciated.
If you dont feel like I deserve a 5 star rating please let me know if there is anything else I can do before rating
Nelson

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Nissan Mechanic: ,  replied 8 months ago
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