How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Jay Your Own Question

Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 15092
Experience:  20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
10181755
Type Your Nissan Question Here...
Jay is online now
A new question is answered every 9 seconds

2002 nissan altima: SL..light throttle..idling..It also stumbles

Resolved Question:

I have a 2002 nissan altima 2.5 SL and it has stumbling during light throttle and idling. It also stumbles while driving.
I replaced the spark plugs and put a set of BWD ignition coils but I still hav the same problem.What can I do to solve this?
The consumer guide has it under Engine Stalling and that a resistor needs to be installed between the coil and the spark plugs.What is the name of the resistor and where do I get it?
Submitted: 5 years ago.
Category: Nissan
Expert:  Jay replied 5 years ago.
Hello and thank you for using JustAnswer.com

Do you have a service engine soon light on?

Let me know, thanks Jay!
Customer: replied 5 years ago.
No I dont have a service engine soon light on.
Expert:  Jay replied 5 years ago.
Do you have acess to a scanner?

Let me know, Thanks Jay!
Customer: replied 5 years ago.
Not immediately but I can tomorrow and get back to you.
Expert:  Jay replied 5 years ago.
That would be fine. I am off from work tomorrow and will be on most of the day and all of the evening. I would like you to check the air and fuel mixture and let me know what it's reading.

I will talk to you tomorrow. Thanks Jay!
Customer: replied 5 years ago.

I got a scanner and plugged it up to the car and got a P0420 code (catalytic converter).

Could this be my problem and do I need to change the oxygen sensors too?

Expert:  Jay replied 5 years ago.
How many miles do you have on your car?

Let me know, Thanks Jay!
Customer: replied 5 years ago.
I have 168,000 miles and I just recondition the cylinder head due to a blown head gasket.
Expert:  Jay replied 5 years ago.
Oh man! I hate to say it. The Catt Converter has failed. That is your first problem with the service engine soon light. It's not a 02 sensor problem. When these catt converters fail, they break up towards the top, and because of this the debris gets sucked into the engine contaminating the entire engine. Once the engine is contaminated, there is no point in trying to repair it. The contamination will only come back and cause issues. The most common that is the first thing it does is burn oil. If you just had a head gasket done and you are having these issues, I would take it back to the mechanic who did the work. You paid to have your car fixed and it sounds like he went about it the wrong way. The stumbling could be due to the work that was performed.

At this point, if you have a oil consumption problem, then most likely your motor is contaminated and will only get worse. But if you don't, then replace that Catt ASAP before it does any damage to your engine.

If you have any more questions on this, please feel free to ask. Thanks Jay!
Customer: replied 5 years ago.

There is no service soon engine light and i am not burning oil.The car runs fine it just stumbles or you may call it miss fire when I throttle slightly over 1,000 rpm and slightly at idle, otherwise it runs fine.If I throttle from take off straight to 1,300 rpm all is ok.

Just to let you know I bought the car 4weeks ago from someone with the head gasket blown, they sold it to me as is.I did the work step by step with the tools specified.The cylinder head was reconditioned by a well known place called Dover cylynder heads in Atlanta Georgia.

When I got the car going a lot of antifreeze was still in the exhaust so I had to run it for a long time.

Expert:  Jay replied 5 years ago.
Well before you do any damage to this engine, I would get that catt converter changed ASAP.

What make spark plugs did you install?

Let me know, thanks Jay!
Customer: replied 5 years ago.

I installed NGK laser Platinum Iridium as recomended.

I will replace the cat by friday.

Expert:  Jay replied 5 years ago.
Do you still have the scanner? I was wondering if you can check the air and fuel mixture for me.

Let me know, thanks Jay!
Customer: replied 5 years ago.

My friend owns the scanner so I will have to drop by his house again tomorrow>

Just to let you know that I pulled up consumerGuide automotive and their study shows this as a trouble spot for this car.

The article states-ENGINE STALLING:a problem with the ignition coils causes stumbling during light throttle cruise or stalling at idle,requiring installation of a resistor between the coils and spark plugs.(2002)What resistor are they talking about?

I am only having the stumbling during light throttle not the stalling at Idle.

I will scan it tomorrow checking the air and fuel mixture.

Expert:  Jay replied 5 years ago.
When the car is fully warmed up, what does it idle at ? not in gear?

The resistor is built into the coils. I know you put after market coils in the car, that could be causing your problem as well.

My question is did you ever perform a Idle relearn after you had the work done to the car? Where is your idle at when the car is fully warmed up?

Let me know, thanks Jay!
Customer: replied 5 years ago.

Yes I had a shop that specialize in nissan with a new machine relearn the idle and it is idling at about 700 -750rpm in park.

I took back the aftermarket coils because I got the same problem with them as the old ones.Are you saying what I was thinking in the first place ,is to go get the OEM from the dealer?The coils on it are the originals and they did get overheated when the previous owner blew the head gasket.

So them lets sum it up ,the new dealer coils are now improved with the resistor to correct this problem.

I saw a lot of blog about this same problem on the internet.

Before I buy any thing more I will get the coils checked then go from there.

Thanks.

Expert:  Jay replied 5 years ago.
Great! Glad you got the idle relearn done. Since you mentioned you had all that work done I was wondering about that.

As for your coils, I can tell you right now, when it comes to electrical parts, the dealer is the only way to go. After market electical parts never seem to work on the newer Nissans. So I would start with coils.

Thanks Jay!
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 15092
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
Jay and 2 other Nissan Specialists are ready to help you
Customer: replied 5 years ago.

I will get back to you tomorrow after I have the coils checked and then replaced.

I will let you know the outcome the we can close.

Expert:  Jay replied 5 years ago.
Not a problem. Talk to you tomorrow evening. I am normally on after 7 pm EST. I may be on and off through out the day, depending if work is slow or not.

Thanks Jay!
Customer: replied 5 years ago.

Hi lay,

I finally got the nissan oem ignition coil and the problem is gone.

thank you.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I was in trouble with an electrical issue with my brand new Nissan. I frantically went online trying to find help and luckily I found your site. I reached a NISSAN tech named RIP. He was absolutely tremendous and helped me work through the issue. What a pro! cjaz Lexington, KY
< Last | Next >
  • I was in trouble with an electrical issue with my brand new Nissan. I frantically went online trying to find help and luckily I found your site. I reached a NISSAN tech named RIP. He was absolutely tremendous and helped me work through the issue. What a pro! cjaz Lexington, KY
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
 
 
 

Meet The Experts:

 
 
 
  • Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    446
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
< Last | Next >
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    446
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
  • http://ww2.justanswer.com/uploads/CA/caprio23/2011-12-13_155550_20111213105344.64x64.jpg Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    306
    ASE Master Automobile Technician with over 18 years exp. in this field.
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    171
    34 years of automotive Repair
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris(aka-Moose)'s Avatar

    Chris(aka-Moose)

    Nissan Technician

    Satisfied Customers:

    165
    16 years of experience
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    ASE Certified Technician

    Satisfied Customers:

    127
    ASE & Bosch master tech. 30 years experience.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2013-8-30_131413_11848761610058140852271553042976n.64x64.jpg Mike V.'s Avatar

    Mike V.

    Nissan Technician

    Satisfied Customers:

    7443
    Nissan factory trained and Certified Subaru Technician.
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    92
    Nissan Tech ASE certified technician
 
 
 
Chat Now With A Nissan Mechanic
Jay
Jay
Shop Forman / Lead Tech / Parent
12551 Satisfied Customers
20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer