bros...
Just checking on some issues with perdana v6 2002.. when engine starts even after warm up and idling..the whole car rattles, from the engine bay looks ok but when inside the car driving or sitting in, ...there is some vibrations in the cabin.. what could it be? the GB falling apart? or engine mounting issues?..or could it be throttle body? There is no gears slippage or drop or whatsoever. Just power loss and rattles in the car..the RPM during idling is 1200rpm, and that is not low at all.
Whenever i accelerate, the vibrations are so obvious and even the passengers can feel & hear it..
there is power loss when accelerating and obviously the engine doesnt sound and feel smooth at all. Can all the sifus share some thoughts and if the repairs gonna be costly.?
Rgds.
Firstly check the engine mounting. broken mounting causes vibration during idling.
Secondly check spark plugs and plug cables. breakdown any of them causes erratic idling and power loss.
Thirdly:
Causes of erratic idling,high petrol consumption and lack of power
This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.
As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.
Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.
The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.
Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.
It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine
Might also be worth cleaning out the idle speed control motor / valve as these get clogged up with carbon and some brake cleaner washed through helps free things off.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.
if the engine condition is the same then chances are the meter or the connection to it is faulty
Air leaks are very temperature dependent as gaps can open or close up as things expand with heat, so they can be effected by the weather and engine temperature.
This leads them to be quite intermittent in the case of mild leaks
its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue
On no account touch the sensor wires with anything physical as they are extremely fragile
