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Toyota engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2000 Toyota Tundra - Engine - 5/27/2014
    Why does truck idle good in N or P, but shakes in gear n acceleration.
    180k,new spk plugs, vac hoses good. misses while idling in gear n struggles on take off. vibrates badly when passing. no eng light on
     
    • GT500Knights
      5/27/2014 GT500Knights
      Check engine and transmission mounts. When a car is idling in park or neutral, there is not load. When the car is put into gear, a load is presented and the engine/transmission uses the chassis as a point to anchor onto. If the the mounts are bad, you will feel the vibrations produced by the engine and/or transmission.

      Other things to check for are a bad map (manifold absolute pressure) sensor and bad O2 (oxygen) sensor. I'm almost positive your vehicle is not "missing" (misfiring)......if it was, the ECM (engine control module) would pick up on the misfires, and then you would have a check engine light.
  • AutoMD Member
    AutoMD Member - 2009 Toyota Corolla - Engine - 5/26/2014
    How do I determine which coil is coil C?
    System says Coil C is defective, must replace but I do not know which cylinder is considered C. Facing vehicle, which sparkplug would be considered C.
     
    • Jimm
      5/26/2014 Jimm


      P0353 = Ignition Coil C Primary/Secondary Circuit Malfunction

      From the front of the engine, the cylinders are numbered 1-2-3-4 (left to right)

      Potential causes of a P0353 code include:
      •Short to voltage or ground on COP driver circuit
      •Open on COP driver circuit
      •Loose connection at coil or broken connector locks
      •Bad Coil (COP)
      •Faulty Powertrain Control Module

      Is the engine misfiring presently? If not, the problem is likely intermittent. Try wiggle testing the wiring at the #3 coil and along the wiring harness to the PCM. If manipulating the wiring causes the misfire to surface, repair the wiring problem. Check for poor connection at the coil connector. Verify the harness isn't misrouted or chafing on anything. Repair as necessary

      If the engine is misfiring presently, stop the engine and disconnect the #3 coil wiring connector. Then start the engine and check for a driver signal to the #3 coil. Using a scope will give you a visual pattern to observe, but since most people don't have access to one there's an easier way. Use a Voltmeter in AC Hertz scale and see if there's a Hz reading of between 5 and 20 or so that indicates the driver is working. If there is a Hertz signal, then replace the #3 ignition coil. It's likely bad. If you don't detect any frequency signal from the PCM on the ignition coil driver circuit indicating the PCM is grounding/ungrounding the circuit (or there is no visible pattern on the scope if you have one) then leave the coil disconnected and check for DC voltage on the driver circuit at the ignition coil connector. If there is any significant voltage on that wire then there is a short to voltage somewhere. Find the short and repair it.

      If there is no voltage on the driver circuit, then turn the ignition off. Disconnect the PCM connector and check the continuity of the driver between the PCM and the coil. If there is no continuity repair the open or short to ground in the circuit. If continuity is present, then check for resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn't, repair the short to ground in the coil driver circuit

      NOTE: If the ignition coil driver signal wire is not open or shorted to voltage or ground and there is no trigger signal to the coil then suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver is at fault, there may be a wiring problem that caused the PCM failure. It's a good idea to do the above check after PCM replacement to verify there won't be a repeat failure. If you find that the engine isn't misfiring, the coil is being triggered properly but P0353 is continually being reset, there is the possibility that the PCM coil monitoring system may be faulty.

      The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities. In fact, they (RockAuto) list the ignition coil from around $40.00 (each) for your vehicle.
  • AutoMD Member
    AutoMD Member - 2009 Toyota Corolla - Engine - 5/26/2014
    How do I determine which coil is coil C?
    System says Coil C is defective, must replace but I do not know which cylinder is considered C. Facing vehicle, which sparkplug would be considered C.
     
    • Jimm
      5/26/2014 Jimm
      P0353 = Ignition Coil C Primary/Secondary Circuit Malfunction

      From the front of the engine, the cylinders are numbered 1-2-3-4 (left to right)

      Potential causes of a P0353 code include:
      •Short to voltage or ground on COP driver circuit
      •Open on COP driver circuit
      •Loose connection at coil or broken connector locks
      •Bad Coil (COP)
      •Faulty Powertrain Control Module

      Is the engine misfiring presently? If not, the problem is likely intermittent. Try wiggle testing the wiring at the #3 coil and along the wiring harness to the PCM. If manipulating the wiring causes the misfire to surface, repair the wiring problem. Check for poor connection at the coil connector. Verify the harness isn't misrouted or chafing on anything. Repair as necessary

      If the engine is misfiring presently, stop the engine and disconnect the #3 coil wiring connector. Then start the engine and check for a driver signal to the #3 coil. Using a scope will give you a visual pattern to observe, but since most people don't have access to one there's an easier way. Use a Voltmeter in AC Hertz scale and see if there's a Hz reading of between 5 and 20 or so that indicates the driver is working. If there is a Hertz signal, then replace the #3 ignition coil. It's likely bad. If you don't detect any frequency signal from the PCM on the ignition coil driver circuit indicating the PCM is grounding/ungrounding the circuit (or there is no visible pattern on the scope if you have one) then leave the coil disconnected and check for DC voltage on the driver circuit at the ignition coil connector. If there is any significant voltage on that wire then there is a short to voltage somewhere. Find the short and repair it.

      If there is no voltage on the driver circuit, then turn the ignition off. Disconnect the PCM connector and check the continuity of the driver between the PCM and the coil. If there is no continuity repair the open or short to ground in the circuit. If continuity is present, then check for resistance between ground and the ignition coil connector. There should be infinite resistance. If there isn't, repair the short to ground in the coil driver circuit

      NOTE: If the ignition coil driver signal wire is not open or shorted to voltage or ground and there is no trigger signal to the coil then suspect a faulty PCM coil driver. Also keep in mind that if the PCM driver is at fault, there may be a wiring problem that caused the PCM failure. It's a good idea to do the above check after PCM replacement to verify there won't be a repeat failure. If you find that the engine isn't misfiring, the coil is being triggered properly but P0353 is continually being reset, there is the possibility that the PCM coil monitoring system may be faulty.

      The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities. In fact, they (RockAuto) list the ignition coil from around $40.00 for your vehicle.
  • AutoMD Member
    AutoMD Member - 2008 Toyota Solara - Engine - 5/25/2014
    Timing chain and waterpump?
    I have noticed some noise in the car coming from the serpentine belt area and yesterday I was driving and it was squealing a little bit when the air conditioner was turned on. When I stopped the car I noticed antifreeze or coolant was leaking on that side of the car ...
     
    • HouseCallAuto
      5/25/2014 HouseCallAuto
      Most likely a bad water pump. Can be replaced without timing chain.
  • AutoMD Member
    AutoMD Member - 2009 Toyota Yaris - Engine - 5/24/2014
    Tapping noise under back seat starts after driving 5 mins tapping increases when idling at the lights
    noise is continuous, have only noticed recently, no lights on the dash. Have been told by Toyota mechanic it is a failed fuel pump-can I use a after market to replace and does the fuel tank need to be cleaned as well please?
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2008 Toyota Camry - Engine - 5/24/2014
    VSC Warning Light came up on dashboard
    mileage 284,000. Just had an oil change, tires rotated, cabin filter and air filter replaced. While driving today the VSC warning came up on the dash. I remember this happening before and Toyota walked me thru it but can't remember what I did.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2013 Toyota Highlander - Engine - 5/22/2014
    What cause engine to vibrates, taps, rattles, and hesitate.
    Went to dealer for an oil change. Car uses 0W20 oil. The oil they use was a very thicker viscosity compare to the thinner oil that was in the car the day of purchase July 2013. Car came out vibrating, tapping, rattles, clanking noises. Dealer said it was the ...
     
    • GT500Knights
      5/22/2014 GT500Knights
      If the incorrect oil viscosity is used that will cause a lot of problems. Newer cars like yours have very close machined parts and surfaces, and very, very tight clearance. Lower viscosity oil is used for this reason, because it has better flow and can lubricate smaller spaces. If higher viscosity oil is used, such as 30 or 40, then the oil will not be able to reach critical engine components such as the valve train or even crank and piston bearings. What probably ended up happening is that, due to improper lubrication, the valvetrain (camshaft, lifters, rocker arms wore themselves to pieces. The tapping noise is the valvetrain. Hydraulic lifters aren't working properly and taking up the slack in the valvetrain causing the tapping you're hearing. I would take it to whoever did the oil change and have a word with them.
      GT500Knights
      5/22/2014 AutoMD Member
      Thank you so much GT500Knights
      I did a history report on this car which require 6.4 quarts of oil with filter. Each time the oil was change, the first time they put 6.0 with filter, 7.0 with filter, 5.0 with filter. Is this the reason why to tapping is happen? As you stated the valvetrain? Do fuel injectors taps and makes vibration? Dealer says that is normal for injectors to taps and vibrate the car. As you can see I dont no anything about engine. Please help me some more. Thank God for you
    • GT500Knights
      5/22/2014 GT500Knights
      Well lower than normal oil level can cause an issue during high rpm situations. While you're idling, maybe 2 quarts would remain within the oil pan. As the engine spins faster , so does the oil pump. If the incorrect amount of oil (too little) is used, what will happen is that as you step on the pedal and Rpms increase, so does the oil pump speed and the volume of oil it circulates. If the pump has no oil to suck up and pump, it will end up sucking air, and then pumps that through the system. Air between components of the engine is never a good thing.... Air doesn't lubricate. As far as the tapping noise, I've never heard of injectors making a tapping noise. It is possible since cars change all the time.
      GT500Knights
      5/22/2014 AutoMD Member
      I agree with you because this car was absolutely quiet the day I took it into the dealer for an oil change. There was absolutely no tapping or vibrations of any kind before I went into the service. I could not hear the engine running most of the time, because it was just that quiet. Now it sounds like a baby diesel and it is worse on an incline like in my driveway. My muffler shakes when I start the car up, do that suppose to happen? Thank you so much. You are really teaching me. :)
  • AutoMD Member
    AutoMD Member - 2002 Toyota Celica - Engine - 5/21/2014
    2002 Celica - CEL P0171 Lean Condition
    I have a CEL on with code P0171. When it is reset at auto place, usually stays that way when I drive home, but next morning it will be on again. It has been on and off for years. It used to stay off for months when reset. So far mechanic tried to clean MAS. I ...
     
    • GT500Knights
      5/19/2014 GT500Knights
      Your system is popping the lean code from two possibilities. First and most likely possibility is a vacuum leak, located somewhere after (and unmetered) by the maf sensor. Listen for any hissing sounds while your engine running. Try to locate the hissing / sucking noise. It's easier to do this with a length of 1/2" rubber vacuum hose. Hold one end to your ear and run the other end along the engine. When you place the hose over where the noise is coming from, it will be magnified. You can also try soapy water. Spray where you think the extra air is getting sucked into. The moment you spray soapy water onto the area of the engine that is leaking is when the engine will idle smoothly.

      Second, check air fuel ratio sensors. Don't just replace them--they are expensive. If you need diagnostic aids, let me know.
      GT500Knights
      5/21/2014 AutoMD Member
      Does the price seem reasonable for the work? And does the work seem reasonable? i.e., Do you think the fuel injection cleaning, and air filters really need replacing. (I have been told that shops often try to oversell fluid cleaning and replacements to make extra $)

      It might be worth noting that I am likely to sell/trade this car in, in the next 6 months. Not sure if its better to put the work into it (i.e. could get more for it) or if its better not to.

      Thanks in advance!
      GT500Knights
      5/21/2014 AutoMD Member
      So I took it to the other shop. This is what they are recommending...

      replace intake manifold gasket
      replace valve gasket
      fuel injection cleaning
      replace serpentine belt (cracked)
      replace air filters
      replace spark plugs (says he can't tell for sure if they are worn... but might as well replace while in there.... I am at 140k and not sure if they were replaced at any point (120k recommended)

      quoting something in the $800's.
    • GT500Knights
      5/21/2014 GT500Knights
      Price doesn't sound too bad for all the work. That's considering you're going to a reputable shop that charges around $120 per labor hour. Everything being replaced seems like it would help with your issues you're having. Especially the intake gasket. Sometimes those can get contaminated with oil and that mixed with heat and time makes them brittle and begin to crack. The valve cover gasket is only necessary if oil is leaking from the valve cover area, or into the spark plug holes. Spark plugs would be a good idea too especially if you're not sure the last time they were replaced.
      GT500Knights
      5/21/2014 AutoMD Member
      The shop is precision Tune. Someone on another forum had a very strong opinion that I should not let them touch my car. What do you think?
  • 64
    64 - 2002 Toyota Camry - Engine - 5/21/2014
    P1155 code on my 2002 toyota camry
    came from auto zone they says my code is p1155 definition air/ fuel sensor heater circuit bank 1 sensor 2.Also went to aamco they say its air fuel sensor heater circuit bank 2 who is right .can some one help I have a 2002 Toyota Camry XLE 6 Cyl 3.0L engine check ...
     
    • Jimm
      5/21/2014 Jimm
      P1155 = Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1

      The bank 2 is rearmost (next to the firewall) set of three (3) cylinders on the transverse-mounted V6 engine. The sensor 1 location would be the O2 oxygen sensor located ahead (upstream) of the catalytic converter.
      - Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1
      - Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted
      - Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
      - Faulty Engine Control Module (ECM)

      Check and repair (as required) the oxygen sensor connections, replace the oxygen sensors. The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities. The various O2 sensors are listed in price from around $32.00 each.

      Please note: this same question was already answered on May 20, 2014.
  • AutoMD Member
    AutoMD Member - 2009 Toyota Corolla - Engine - 5/20/2014
    My car makes noise when I am trying to accelerate and it reaches 3200-3400 RPM.
    Mileage - 53k Noise comes when I am pressing hard on the gas pedal to accelerate after a stop. It comes especially at 3200-3400 rpm
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2009 Toyota Corolla - Engine - 5/20/2014
    My car makes noise when I am trying to accelerate and it reaches 3200-3400 RPM.
    Mileage - 53k Noise comes when I am pressing hard on the gas pedal to accelerate after a stop. It comes especially at 3200-3400 rpm
     
    0 answer
  • 64
    64 - 2002 Toyota Camry - Engine - 5/20/2014
    Code p1155 2002 Toyota camry v6 engine can someone help me with this.thank you
    my car has 80000 miles check engine light is on got the code and it says p1155 .my car is a 2002 Toyota camry v6 engine
     
    • Jimm
      5/20/2014 Jimm
      P1155 = Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1

      The bank 2 is rearmost (next to the firewall) set of three (3) cylinders on the transverse-mounted V6 engine. The sensor 1 location would be the O2 oxygen sensor located ahead (upstream) of the catalytic converter.
      - Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1
      - Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted
      - Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
      - Faulty Engine Control Module (ECM)

      Check and repair (as required) the oxygen sensor connections, replace the oxygen sensors. The parts are readily available from these many on-line sources, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - to list only a few possibilities. The various O2 sensors are listed in price from around $32.00 each
      Jimm
      5/20/2014 64
      thank jimm just came from auto zone they says my code is p1155 definition air/ fuel sensor heater circuit bank 1 sensor 2 is this the same as the above answer you gave me.thanks again for your help
  • AutoMD Member
    AutoMD Member - 2004 Toyota Corolla - Engine - 5/19/2014
    Why did my 2004 Corolla suddenly drop from 30 MPG to 21 MPG?
    Recent issues: 143k miles: CEL came on with car vibrating especially while idling. Diag code suggested that an ignition coil was misfiring. Replaced ignition coil, which did not fix the problem. Mechanic replaced spark plugs, which did appear to fix it. Oil was ...
     
    • GT500Knights
      5/19/2014 GT500Knights
      How is the vehicles performance compared to how it previously ran? Any significant difference now in idle, acceleration, and such? Search for any vacuum leaks. Check for any pending codes as well. Check fuel pressure with engine off and ensure it does not drop (with fuel return line pinched). Check ect sensor operation. If you have a scanner to read live data, observe ect and IAT sensors after the car has been sitting for at least 6 hours. Their temperature readings should be within 5 deg F of each other. If not then measure their resistances and compare it to a chart. Check oxygen sensor operation, and ensure you also do not have any exhaust leaks. If you need me to provide you any diagnostic charts and info, let me know.
  • AutoMD Member
    AutoMD Member - 2004 Toyota Corolla - Engine - 5/19/2014
    Why did my 2004 Corolla MPG suddenly drop about 35%?
    Recent issues: 143k miles: CEL came on with car vibrating especially while idling. Diag code suggested that an ignition coil was misfiring. Replaced ignition coil, which did not fix the problem. Mechanic replaced spark plugs, which did appear to fix it. Oil was ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2012 Toyota Prius - Engine - 5/17/2014
    While I was driving my car fuel end. Now after putting 20 Ltr Fuel its start but does not move
    its 100000/ km driven I have already tried disconnecting n reconnecting rear Battery Wires. Its starting on Battery but Engine is not Starting
     
    0 answer