Could my Holden Commodore have a manifold leak?
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Asked by Steve
My five-litre VR Holden Commodore has a big flat spot when cold and hunts on very light throttle. Parts replaced include the ignition module, coil, distributor, injectors, fuel pump, plugs, leads, and the oxygen sensor. The throttle body has been cleaned and vacuum hoses checked. The problem improves when engine temperature normalises. Also, it does have noisy lifters. Could this be caused by a manifold leak?
Answered by CarsGuide
24 Jan 2025A manifold leak will throw the engine’s fuel-air ratio out the window and can cause poor cold running and hard starting. The old school way of checking for a vacuum leak is to get the engine idling and then spray either carburettor cleaner (or something else flammable) around the intake area of the engine. If the engine suddenly picks up revs, you almost certainly have a vacuum leak. But be careful, spraying flammable stuff around a running engine comes with a fire risk.
The other thing to check would be the throttle body and the sensor attached to it that tells the computer how much throttle has been applied. Again, these can start to give false readings, throwing the fuel-air mixture out.
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