Are you having problems with your Holden Commodore? Let our team of motoring experts keep you up to date with all of the latest Holden Commodore issues & faults. We have gathered all of the most frequently asked questions and problems relating to the Holden Commodore in one spot to help you decide if it's a smart buy.
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You're right to be concerned as there are lots of reports of problems with the Gen III engine. You're also right they can use oil at an alarming rate, and they can have a piston rattle. Holden has rebuilt lots of them under warranty, so I would ask the seller about any work that has been done on the engine. Ask for proof positive that work has been done if they say it has. Ask also for any records of oil consumption they might have kept. It's impossible to tell if an engine is using oil simply by looking at it, so you have to try to get as much info out of the owner as possible, and hope they're telling the truth. Check the service book for anything that might say it's been in for extra servicing, or had additional oil added. As for the noise, listen carefully for a light metallic rattle as you blip the throttle. There's no need to rev it hard, simply blip the throttle and you should be able to hear it if it does rattle. Keep it in the back of your mind that there are plenty of cars out there, so if you have any doubts about the car you're considering, walk away.
The change took place with the VX in 2000. The increase in power is predominantly due to a more powerful electronic control module that could process more data more quickly, and a new smoother intake manifold that improved the V6's gas flow and volumetric efficiency.
Early Commodores with independent rear suspension suffered from high tyre wear because of geometry changes they went through as they worked. Anything that made the rear lower, such as putting the weight of a trailer on it, made it worse. So the advice you received was correct and you would have to replace tyres more often on a Commodore built before the VX Series II. The VX Series II saw the independent rear suspension improved with additional links to particularly control the changes in toe-in as the wheels moved up and down. This meant Holden could change the suspension settings which reaped benefits in tyre wear, as well as worthwhile improvement in ride, handling and stability. If you are looking to buy, then I would recommend the VX Series II, but if you have a car you want to improve, then take it to a suspension specialist who will be able to suggest ways to solve the problem.
There's virtually no similarity between the Bathurst racers and the road cars you and I buy from Ford or Holden, apart from a vaguely similar appearance. The engines are purpose-built 5.0-litre V8s. Neither Ford nor Holden have a production 5.0-litre V8 on sale. The gearboxes are purpose-built for racing and the suspensions are special, as are the brakes, wheels and tyres. The bodies may look like the production equivalent, but they're specially built, incorporating roll cages and other reinforcements. And get this: the Commodores now run a Falcon-type wishbone front suspension instead of the MacPherson strut the production cars run. The Commodore racers have long-run Ford nine-inch diffs as well.
We contacted Holden for their response, which is: ``While it is impossible to diagnose a car without sighting it, rough running on start-up and/or hard starting can be caused by many things, including leaking injectors, carbon build-up on the valves, etc. Injectors wear over time and are also subject to deposits from the fuel. Given the age of the vehicle, injector leakage is a possibility. This is not a generic V6 problem. If the injectors are in fact leaking, this is a maintenance item. Injector leakage can be tested by carrying out a pressure test and confirming pressure drop.'' I think this is good advice. Take the car to a fuel-injection specialist and have them check the injectors, and think about having them cleaned.
The Commodore will need an upper cylinder lubricant added to the fuel if you run it on ULP. The Toyota should happily run on ULP without any additional lubrication.
On the surface it sounds a reasonable deal. You would expect a VT to have done 90-110,000km on average, so the mileage is below average. The trade is paying $11,000-$13,500 for a VT S at the moment, and retailing them at $15,000-$18,000. Check the car thoroughly, and make sure the odometer is correct.
Since you have covered the basics of fitting new spark plugs and leads, I'd look deeper. It sounds as if you might have a burnt valve so I'd suggest you get a mechanic to do a compression test on the engine and look for a cylinder that is not holding compression.
It's certainly worth upgrading your brakes to the later VT set-up. You will improve your braking performance. As far as the shocks go, it's worth fitting new ones. Shocks are a most important safety item in your suspension, and there could be ride benefits as well. I would suggest either Koni or Bilstein shocks, though they are more expensive than the Monroes.