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 david Your Own Question

david
david, Auto Service Technician
Category: Car
Satisfied Customers: 1499
Experience:  Certified Master Technician,Certified in diesel & gasoline engines
533087
Type Your Car Question Here...
david is online now
A new question is answered every 9 seconds

check engine light on, code p1349 miss at idle & low volt

Resolved Question:

check engine light on, code p1349 miss at idle & low volt at bank 1 o2 sensor, also vsc light on      1999 es300 aprox 161000 miles
Submitted: 5 years ago.
Category: Car
Expert:  david replied 5 years ago.

Hi thank you for your question hope this helps.

 

DTC P1349 is "VVT (Variable Valve Timing) System Malfunction (Bank 1)".

 

VVT system controls the intake valve timing to the proper timing in response to driving condition. ECM controls OCV (Oil Control Valve) to make the intake valve timing properly, and, oil pressure controlled with OCV is supplied to the VVT controller, and then, VVT controller changes relative position between the camshaft and the crankshaft.

 

Here is how this system works. There is an oil control valve on each cylinder head that directs oil flow through the cam and adjusts valve timing.

 

There are 2 possibilities here as to what is happing. One is that the controller on the cam is physically stuck.

 

The other is that the oil control valve is in the wrong position (either stuck or activated in error.)

In most cases it is possible that you are experiencing an oil gelling (sludge) build up in the engine.

 

Simply check under the oil cap for what looks like sludge and check the dipstick for something that looks like a varnish on the dipstick.

If this is the case, you will need some pretty extensive engine repairs performed by a qualified technician familiar with Lexus engines to remove the build up of gelling (sludge) .

 

If this is not the case, you could be looking at a couple of other things.

The last time I saw this exact condition actually ended up needing a computer.

The ECU was commanding the oil control valve on at various times when it should not have been, like at idle.

 

The first thing to do is to unplug the the oil control valve connector on the front valve cover, then start the car and see if it idles any better.

Repeat this for the rear one if needed. The procedure I am looking at for this code states that P1349 specifies the front (left) cylinder.

If this solves your problem, you will most likely be looking at computer to repair this problem.

 

If it does not, you will need to have a technician with a Toyota diagnostic scanner check this system, as it will require the oil control valves to be commanded 'on' by the scanner. You may need to replace a faulty control valve,

Don't condemn the other one if it checks out OK.

 

Always fix whats broken, not the same part other side just because. You would be wasting your money.

 

 

Expert:  david replied 5 years ago.

hear is a pic of a vvt valve mounted in the valve cover

graphic

 

Hope this helps

Good luck

Customer: replied 5 years ago.
what about the low voltage showing at o2 sensor ?
Expert:  david replied 5 years ago.

I would say it is related to the miss fire. this would put unburnt fuel into the exhaust and the o2 sensor will read it as retch recondition.

 

I would start with the Variable Valve Timing code,
then if the o2 is still acting up go from there.

 

Good luck

Customer: replied 5 years ago.
we unpluged vvt , car seems to run good. which fix is most likly ? if you state ECM where is it located ?
Expert:  david replied 5 years ago.

Yes if the engine soothed out after unpluging the vvt valve then the problem is in the ECM.

 

The ECM in mounted under the hood passenger side fire wall

graphic

 

Hope this helps

Good luck

david, Auto Service Technician
Category: Car
Satisfied Customers: 1499
Experience: Certified Master Technician,Certified in diesel & gasoline engines
david and 15 other Car Specialists are ready to help 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 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
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • 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:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician
 
 
 
Chat Now With An Auto Mechanic
david
david
Auto Mechanic
1499 Satisfied Customers
Certified Master Technician,Certified in diesel & gasoline engines