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VX Commodore revs surging

lukemartin94

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It's surging up and down anywhere from 100-500 revs, can do it for up to 2 minutes straight just constantly jerking or it might do it for just a second then be fine again. Coolant levels are fine and no leaks in those hoses.
 

SavVYute

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Don't go sinking money into trying to repair it until you run a diagnostic scan on it.
You may find it is a sensor like the VSS not working properly.
 

BlackVXGTS

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Don't go sinking money into trying to repair it until you run a diagnostic scan on it.
Did you read the OP's first post?

Faulty/contaminated oxygen sensors can cause this problem.
 

Nut Kracker

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I know you have replace it, but the TPS can have this surging effect.
If it is faulty, the ECU doesn't properly know what position the throttle is in and this will cause throttle surges.

You could try re-setting the TPS.

1) Un plug TPS.
2) Turn ignition to "on" position (red lights on)....Turn ignition off.
3) Plug TPS back in.
4) Turn ignition to "on" position (red lights on)....Turn ignition off.
5) Start the car.
 
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SavVYute

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Missed the bit you had scanned it.
Dirty injectors could be a possibility.
 

vyseriesII

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DFCO it could be depending on when it's doing it. Between say 70 to 100kmh the ecu cuts fuel to better fuel economy when there is no load. It can make the revs hunt.
 

lukemartin94

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I will try resetting the TPS thank you.
I have pulled all injectors out and checked them, they are working fine :/
And vyseriesII, What is the DFCO?

Thanks again for the help guys.
 

lukemartin94

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Just tried resetting the TPS, problem is still there.

I have not checked the O2 Sensors yet as I was told that they wouldnt be causing the problem unless when I accelerated hard it was blowing black smoke, which its not. But could be faulty information?
 

supercharger kingy

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my vx calais supercharged rev surges when cruzing on around 60-100ks, not badly just a little rev from like 1000rpm-1200rpm i cleaned the maf sensor and air control valve and helped a little but iam not stalling or loosing power so havnt worried about it.
Mine does this to when i take my foot off the accelater and cruise down hills.. sounds like i have a lumpyer cam lol .. havent lost power and never stalled. i think its got to do with the charger
 

SavVYute

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I have pulled all injectors out and checked them, they are working fine :/
You've had them flow tested, checked the spray pattern and renewed the injector O ring seals when you replaced them?
 
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