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[Web Creator] [LMSOFT]
VX Commodore Engine Issues
Phoenix Mechanical
Soaring
V6 Engine Pulley noise - Some V6 engine pulleys develope a ringing type noise at idle, which may be caused by the drive belt slapping against the A/C idler pulley. A revised A/C idler pulley was introduced late 2000.

Idler pulley Assembly - Part number 92094003
Idler pulley support - Part number 92065824
Drive belt  - Part number 92100691

Belt Squeal (SC V6) - The supercharger belt may squeal or chirp during cold start conditions, if the belt is old or if the pulleys are misaligned.

Supercharger Drive Belt - Part number 92067829

Rough Idle or Hissing Noise (Gen III) - Some Gen III's may experience rough idle, a high pitched hissing noise and the engine chack lamp illuminates on the dash. The PCV (positive cranckcase ventilation) pipe may deteriorate, perish and fail causing these problems. A revised PCV pipe made of more durable material was released.

PCV Pipe – Part number 12590632

Gen III Oil leaks - On the front left edge of the engine sump, there is a oil pan transfer cover (just above the oil filter). Some Gen III's may leak oil from this area. A possible caused can be porosity in the oil pan transfer cover stud holes. A revised sump was introduced early in 2000. O-Rings were added to the oil pan transfer cover studs (with a gasket as well), to help reduce leaks from this area. In some situations, the sump itself can be porous and may need to be replaced.

Unfortunately, early production sumps can not have O rings fitted to them, as they have not been counter bored around the transfer cover mounting studs.

Gen III's engine covers - Engine cover rattle at idle, or just above idle speed is common. This is caused by the engine cover contacting the coil/bracket assembly. GMH have revised the support brackets and the mounting nuts. Split covers are readily available which reduce inlet manifold temperature for better performance. In mid 2002, the brackets were again revised with bumpers, and no longer require spacer nuts.


RH Engine Cover Support Bracket(includes new bumper 92138641) - Part number 92087580

LH Engine Cover support Bracket (includes new bumper 92138641) - Part number 92087581

Bumper (15mm high, slotted) - Part number 92138641

Nut  - Part number 09440004 

Engine cover Insulator (front) - Part number 92086029

The engine cover may also rattle against the hydraulic clutch hose on manuals built before vin # L867194. The clutch hoses may become twisted or distorted and interfer with the engine cover. A revised clutch hose with quick-connect fittings was introduced mid 2002.

Gen III Belt Squeal - In some cases, Gen III engine serpentine belts will squeal at around 1500 to 1900 rpms. The squeal can occur if the power steering pump pulley is misaligned with the crank pulley and the alternator pulley. The pump pulley may be too close to the pump body or too far forward. This can cause the belt to not track straight and will rub on the front or rear flange of the pulley. An adjustment of the power steering pump pulley (between 1 – 3mm) may be required, to re-align the pulleys.

Some Gen III Automatics may develop a belt chirp/squeal under hard acceleration, during the 1-2 shift.
Decreased damping of the belt tensioner increases this condition, so a revised belt tensioner with increased damping was introduced early 2002.

Belt Tensioner - Part No 92111701

Gen III Vibration - Some VX's may suffer from an excessive vibration, which is felt within the
vehicle. Vibrations may be felt when A. The vehicle is stationary with the engine idling in gear and the A/C is on , B. When the idle speed drops during automatic gear selection and/or a steering load is applied, or C. During slow acceleration or low speed driving in a low gear, with engine speed between 650 and
1000 rpm. A common cause may be a stressed exhaust system. A Bent catalytic convertor bracket is an indication that exhaust stess is evident (this should be straight). Spacers can be added to keep this bracket straight when bolted in place.

Catalytic Convertor bracket bolt - Part number 90495649
Flat washer (spacer) - Part number 120394

Along with a sequence of loosening and retightening exhaust and mount bolts, extra bolts were added to the rear gearbox mount. In late 2000, extra studs were added to the gearbox mount, so only extra nuts are required.

Gearbox mount bolt - Part number 92138301
Gearbox mount nut - Part number 11086962 (torque to 45-55 Nm)