Question about 2004 Toyota Corolla

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Dear readers, I am having a problem with a rough idle. My mechanic cleaned the injectors, adjusted the idle and even had a diagnostics done, but nothing worked. I took the car to someone else and he adjusted something on the throttle body and it worked for one day. Could it be that my throttle body needs changing. Any help will be greatly appreciated. Amanda.

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  • Toyota Master
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Before you could proceed, confirm the following basic adjustments:
1. Check the valve tappet clearance at operating temp (80 degrees Celsius and above)
Intake = 0.25 - 0.30
Exhaust = 0.25 - 0.30)
2. Spark plug gaps = 0.9mm - 1.1mm
3. Clean the throttle body and Idle Air Control Valve.
4. Take the Ignition key out of key cylinder and remove the battery negative terminal for one minute or more and then tight it again back.
CAUTION: BY REMOVING THE BATTERY TERMINAL ALL THE PREVIOUS CODES AND FREEZE FRAME DATE WILL BE LOST.
MAKE SURE YOU HAVE THE NAVIGATION AND MAP DVD AND THE CAR IS NOT EQUIPPED WITH TRACKER SYSTEM. IF YOU ARE DOUBTFUL DO NOT REMOVE THE BATTERY TERMINAL. ONLY REMOVE THE EFI FUSE FOR ONE MINUTE OR MORE THEN FIX IT BACK.
5. Sit on the driving seat. Keep the steering wheel in the center position. Lower the drivers window with key on engine off. Put the gear in P or N. Pull the hand brake. Switch off all accessories (heater, lights audio and video system, room light). Do not depress the brake pedal.
6. Make sure that coolant level is topped up, and engine oil level is normal.
7. Start the engine and hold the throttle paddle at 3000 rpm till the radiator fan comes on. Once the fan is on release the throttle pedal and let the engine run at idle for 8 to ten minutes. Do not open any door or operate any accessory, because doing so will interrupt the relearning process.
8. The desired idle speed is 715 -735 rpm. If it is above or lower than the desired rpm, loosen the 8 mm throttle stop screw nut, loose or tight the small Allen screw, bring it at the desired rpm and lock the nut.
Regards,
Shadab Lodhi

Posted on Feb 05, 2013

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It could be your MAF Mass Air Flow Sensor a bad resistor inside the sensor can cause a rough idle(MAF measures the air going into your engine and can cause many problems.) On top of that you should also check your EGR Exhaust Gas Release/Recirculation Valve that can also cause a rough idle(EGR Releases/Recirculates Exhaust gases into certain cylinders to cool them down and bring the engine temp. down or up(with restriction of exhaust Gases) but can cause a rough idle, Possibly just need to Clean you IAC EGR and MAF and you should be all set.

Posted on Jul 20, 2009

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Have them check your IAC (idle air control) or just unplug it and see if it runs better. if so then replace it.

Posted on Apr 16, 2009

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Car idle is rough Inspection Service & Cost A rough idling engine can be caused by a number of issues, some of them are serious while others tend to be minor, but the symptoms remain pretty much the same. The car will feel rough and bouncy when the engine is running. The car will also idle below its regular speed, display inconsistent RPMs and may produce a shaking, skipping or slipping sound when the vehicle is running.
While a rough idling engine may seem to be a simple inconvenience it often indicates a deeper problem within the engine. The vehicle should be inspected and repaired as soon as possible because small problems have a way of turning into expensive repairs. How this system works: The idle speed of an engine is basically the rotational speed the engine runs on when it is un-coupled from the drivetrain and the throttle pedal is not being depressed. The idle speed is measured in the revolutions per minute of the crankshaft.
When an engine is running at idle speed it generates enough power to smoothly operate equipment such as the water pump, alternator, and power steering but not enough power to move the vehicle itself. A passenger car will usually idle between 600 RPMs and 1000 RPMs. A properly functioning idle should run smoothly without skipping or slipping. Common reasons for this to happen:
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Hook up a portable trouble code tool for your specific Ford make and model. Look for any trouble codes that appear while the engine runs at idle. Write down any code number and look it up in a trouble-code manual. Most times, code numbers can pinpoint the exact system failure or miss in the engine.
Powerful Autel MaxiDAS DS708 Multi language Diagnostic tool

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