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VX Commodore revs surging

lukemartin94

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Hey guys, I have a vx commodore executive automatic. when I'm driving at different speeds I can see the taco going up and down slightly and feel the car following. I cant seem to trace the problem :/

I've put a new fuel pump and filter in, swapped coil packs+dfi module over, new Crank angle sensor, checked fuel injectors, new air temp sensor, Throttle position Sensor, new leads and spark plugs and had my car scanned. I'm not sure what else it could be, it seems to play up more when the car is warmed up, but does it when cold some times too.

any help would be greatly appreciated!
 

commodore665

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the idle air control valve might need cleaning .
 

Cashman_309

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Unless you're also experiencing misfiring then it's probably a vacuum leak. Misfire and bad idle would indicate an ignition problem.
 

VX Exec

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When was the last time you checked your tranny fluid?...
 

lukemartin94

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I'll check it over for vacuum leaks, thanks

and trans fluid is fine.

Thanks guys :D
 

BlackVXGTS

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You'll get some variation in revs depending on whether or not the torque converter is locked up or not. What specific rev variation are you getting? Is it happening at city driving speeds or country speeds (>80 kph)?
 

inSight

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You'll get some variation in revs depending on whether or not the torque converter is locked up or not. What specific rev variation are you getting? Is it happening at city driving speeds or country speeds (>80 kph)?
Had a similar issue with my old Mazda 626. Think it was coolant related. Maybe check coolant levels or see if there is a leak?
 

eliteaaron

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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.
 
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