Spark Plugs Toyota Corolla E11

22.1 To change the spark plugs you'll need a torque wrench, extension, ratchet, socket and a set of feeler gauges

Non-VVT-i models -every 30 000 km or 2 years

VVT-i models -

every 65 000 km or 4 years

1 Spark plug renewal requires a spark plug socket which fits onto a ratchet. This socket

Maintenance procedures 117

Sparkplug Gap Toyota Sienna 2001

22.4 Measure the spark plug electrode gap with a feeler gauge is lined with a rubber grommet to protect the porcelain insulator of the spark plug and to hold the plug while you insert it into the spark plug hole. You will also need a feeler gauge to check and adjust the spark plug gap and a torque wrench to tighten the new plugs to the specified torque (see illustration).

2 If you are renewing the plugs, purchase the new plugs, adjust them to the proper gap and then fit each plug one at a time. Note: When buying new spark plugs, it's essential that you obtain the correct plugs for your specific vehicle. This information can be found in the Specifications Section at the beginning of this Chapter, or in the owner's handbook.

3 Inspect each of the new plugs for defects. If there are any signs of cracks in the porcelain insulator of a plug, don't use it.

4 Check the electrode gaps of the new plugs. Check the gap by inserting the feeler gauge of the proper thickness between the electrodes at the tip of the plug (see illustration). The gap between the electrodes should be identical to that listed in this Chapter's Specifications. If the gap is incorrect, carefully bend the curved side electrode slightly.

Caution: Some plugs are supplied with the gap preset. There is no need to adjust them.

5 If the side electrode is not exactly over the centre electrode, align them.

Removal Non-VVT-i engines

6 To prevent the possibility of mixing up

22.10a Prise out the fasteners at the rear of the plastic cover...

22.6 When removing the spark plug HT leads, pull only on the boot and use a twisting/pulling motion spark plug leads, work on one spark plug at a time. Remove the HT lead and boot from one spark plug. Grasp the boot - not the lead - as shown, give it a half twisting motion and pull straight up (see illustration).

7 If compressed air is available, blow any dirt or foreign material away from the spark plug area before proceeding (a common bicycle pump will also work).

8 Remove the spark plug (see illustration). Examination of the spark plugs will give a good indication of the condition of the engine. If the insulator nose of the spark plug is clean and white, with no deposits, this is indicative of a weak mixture or too hot a plug (a hot plug transfers heat away from the electrode slowly, a cold plug transfers heat away quickly).

9 If the tip and insulator nose are covered with hard black-looking deposits, then this is indicative that the mixture is too rich. Should the plug be black and oily, then it is likely that the engine is fairly worn, as well as the mixture being too rich. If the insulator nose is covered with light tan to greyish-brown deposits, then the mixture is correct and it is likely that the engine is in good condition.

VVT-i engines

10 Undo the two nuts, prise out the two plastic fasteners at the rear, then lift off the plastic cover on top of the engine (see illustrations).

11 Disconnect the wiring plugs from the ignition coils.

12 Undo the bolts and pull the ignition coils from the top of the spark plugs (see

22.8 Use a spark plug socket with a long extension to unscrew the spark plug illustration). Recover the dust seal (where fitted).

13 If compressed air is available, blow any dirt or foreign material away from the spark plug area before proceeding (a common bicycle pump will also work).

14 Remove the spark plug. Examination of the spark plugs will give a good indication of the condition of the engine. If the insulator nose of the spark plug is clean and white, with no deposits, this is indicative of a weak mixture or too hot a plug (a hot plug transfers heat away from the electrode slowly, a cold plug transfers heat away quickly).

15 If the tip and insulator nose are covered with hard black-looking deposits, then this is indicative that the mixture is too rich. Should the plug be black and oily, then it is likely that the engine is fairly worn, as well as the mixture being too rich. If the insulator nose is covered with light tan to greyish-brown deposits, then the mixture is correct and it is likely that the engine is in good condition.

Refitting

16 Prior to installation, it's a good idea to coat the spark plug threads with anti-seize compound (see illustration). Also, it's often difficult to insert spark plugs into their holes without cross-threading them. To avoid this possibility, fit a short piece of 8 mm internal diameter rubber hose over the end of the spark plug (see illustration). The flexible hose acts as a universal joint to help align the plug with the plug hole. Should the plug begin to cross-thread, the hose will slip on the spark

22.10b ... then lift the cover from place

22.12 Undo the screw (arrowed) and lift out the ignition coil

1^18 Maintenance procedures

22.16a Apply a thin coat of anti-seize compound to the spark plug threads plug, preventing thread damage. Tighten the plug to the torque listed in this Chapter's Specifications.

Non-VVT-i engines

17 Attach the plug lead to the new spark plug, again using a twisting motion on the boot until it is firmly seated on the end of the spark plug.

18 Follow the above procedure for the remaining spark plugs, renewing them one at a time to prevent mixing up the spark plug leads.

VVT-i engines

19 Refit the coils to the top of each spark plug, ensuring the dust seal (where fitted) is correctly located. Tighten the ignition coil bolts to the specified torque,

23 Coolant renewal

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  • huriyyah
    How tochange sparkplug e11?
    8 years ago

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