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Compression (Sienna)

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  1. Remove outer front cowl top panel assembly.
    1. Remove hood and 2 wiper arm head caps. Remove 2 nuts and wiper arm and blade assemblies.
    2. Remove head to cowl top seal and cowl panel hole cover.
    3. Remove clip and disconnect window washer hose and remove cowl top ventilator louver. Remove RH and LH ventilator louvers.
    4. Remove 11 bolts and disconnect wiper motor connector and remove cowl top ventilator louver.
  2. Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged.
  3. Remove ignition coils. See IGNITION COIL under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs.
  4. Fully open throttle and using compression gauge, check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See COMPRESSION SPECIFICATIONS  table.
  5. If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
  6. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 71 INCH lbs. (8 N.m). Install outer front cowl top panel assembly and tighten wiper arm and blade assembly nuts to 15 ft. lbs. (20.5 N.m).
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