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 Drew Your Own Question

Drew
Drew, Super Mazda Tech.
Category: Mazda
Satisfied Customers: 2518
Experience:  19 yrs. experience. Mazda Senior Certified Tech, with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
49548721
Type Your Mazda Question Here...
Drew is online now
A new question is answered every 9 seconds

Mazda 6 I: Hi. I have a 2004 Mazda 6 2.3 L 4 cylinder. The

Customer Question

Hi. I have a 2004 Mazda 6 2.3 L 4 cylinder. The car overheated a month ago, and when I pulled codes, I got a P2187 and a P0303. My symptoms after that point were: rough idle (RPM fluctuate between 500 and 1000), misfire, rapid heating, slow acceleration, and a shakey steering wheel. Paying attention to the engine misfire code, I replaced the spark plugs, spark plug wires, coil pack, air filter, and I cleaned the MAF. After I replaced the coil pack, the RPMs didn't fluctuate like they had when it's parked, and it ran really well for about 4 miles. I was about to test it on the freeway when it started to overheat. It also started to run very poorly (poor acceleration, coughed and sputtered at stoplights, knocking sounds). I came home promptly. Since then, I've done some research on the internet. It seems the most likely problems are either an internal leak, bad thermostat, or bad o2 sensor. I thought it could be a vacuum leak, but it seems that a leak wouldn't cause the overheating. Before I go purchase a compression tester and replacement o2 sensors, I wondered if you might be able to narrow it down.
Submitted: 1 year ago.
Category: Mazda
Expert:  Drew replied 1 year ago.
Welcome to Just Answer. My name is XXXXX XXXXX I will be glad to assist you.

Sounds like you have a couple different concerns here.

For your overheating concern, you need to make sure the radiator cooling fan is coming on when the engine temperature rises above normal.

If the fan does work, and the cooling system is full, then I suspect you have a thermostat that is stuck closed. You can verify this by checking the temperature difference between the upper and lower radiator hose. If the lower hose is significantly cooler then the top radiator hose, then the thermostat is stuck closed. I suggest only replacing with a Mazda factory thermostat. No aftermarket parts.

For your P2187 concern, I suspect that you have a vacuum leak and that contributes to the idle concern. The most common area is a EVAP purge valve that is stuck open or a PCV hose that is rotten off under the intake manifold. You may hear a hissing noise when started cold. That is the sound of a vacuum leak. You can verify this by spraying carb cleaner or brake cleaner under the intake manifold in the area of the PCV valve. If you hear a change in idle when the vacuum leak sucks in the additional fuel supply, then you found the leak.

To test the EVAP purge valve, you can pinch off the hose between the purge valve and the engine or just disconnect it from th e vacuum hose and cap it off. If the engine runs normal, the purge valve is stuck open.

For your P0303 misfire concern. I want you to clear the codes and test drive after resolving the other concerns to see if you still have a misfire.

I also suggest using some throttle body cleaner to clean the throttle plate and throttle body bore to remove all the black carbon/coke build-up.

Thanks
Drew
Drew, Super Mazda Tech.
Category: Mazda
Satisfied Customers: 2518
Experience: 19 yrs. experience. Mazda Senior Certified Tech, with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
Drew and 6 other Mazda Specialists are ready to help you
Customer: replied 1 year ago.

Great suggestions. I'll give those a try. Very practical and well-explained. Thank you.

Expert:  Drew replied 1 year ago.
Thanks for the rating.

You can reply back here at any time and I will be glad to help with any additional questions.

Thanks
Drew

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 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
< Last | Next >
  • 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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
 
 
 

Meet The Experts:

 
 
 
  • Drew

    Super Mazda Tech.

    Satisfied Customers:

    2176
    #1 rated Mazda technician. 17 yrs. experience as a shop owner. Mazda Certified with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
< Last | Next >
  • http://ww2.justanswer.com/uploads/supermazdatech/2010-8-24_54425_Self_Portrait.jpg Drew's Avatar

    Drew

    Super Mazda Tech.

    Satisfied Customers:

    2176
    #1 rated Mazda technician. 17 yrs. experience as a shop owner. Mazda Certified with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
  • http://ww2.justanswer.com/uploads/MA/mazdamaster577/2012-6-7_13242_IM001017.64x64.JPG mazdamaster577's Avatar

    mazdamaster577

    Master Technician

    Satisfied Customers:

    633
    mazda master/shop foreman for 15 years.
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    354
    15+Years
  • http://ww2.justanswer.com/uploads/MI/mikeamechanic/2013-4-2_175558_photo.64x64.JPG Mike Kelly's Avatar

    Mike Kelly

    Mazda Mechanic

    Satisfied Customers:

    269
    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.
  • http://ww2.justanswer.com/uploads/maddogtech/2008-12-13_185836_ed1.JPG Mazda Ed's Avatar

    Mazda Ed

    ASE Certified Technician

    Satisfied Customers:

    264
    ASE Certified Mazda Master Technician
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Technician

    Satisfied Customers:

    247
    16 years of experience
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Mazda Tech -

    Satisfied Customers:

    232
    18+yrs experience. State Inspector and Mazda Diagnostics