Hi, hope some experts can help me out here with this strange problem...as I press down accelerator pedal rapidly this problem happen at idle
https://youtu.be/G6owqAJEUl8
it does not happen if I press accelerator smoothly/ slowely
We have already replaced coil, spark plugs, injectors, fuel pumps..this problem occurs only when temperatures is liw( around 30 degree Celsius), once engine is warmed up like after 20 minutes of idling, problem goes away.
what do u think guys ?
Mileage around 150000kms

 

1st question is why would you press the throttle down rapidly on an engine that isn't warmed up yet with no load on it? Maybe it's the cars way of protecting itself and you from a major repair bill. Even so, that behavior doesn't look normal where the car is popping and sputtering before the revs climb. When were spark plugs and coils last done? What are the bank 1 and bank 2 fuel trim numbers when this is happening? How long after you start it are you trying to rev it up like this?

Also, what's with the blinking warning lights? When was the battery last fully charged or replaced?

 

Thanks for the reply..
It is not too rapid, yes it is push but not too much..
Spark plugs & ignition coils were changed very recently ( 5-10 days ago)... Now battery has been replaced with a new one, there are no more lights on dash( while we captured the video, battery was low).... Yet there is a fault P0418( related to secondary air pump relay), but being a 2007 C4s model ,I don't see any secondary air system in car, no pump there..
this problem occur whenever I do press accelerator rapidly for 1st 20-25 minutes, than as the care heats up problem goes away...
I have not taken any fuel trim data, I will surely take oxygen sensor values into account asap...
Thanks..

 

Secondary air pump is mounted on bank 1 forward and a bit inside of the intake manifold. It's the black and silver thing with the barcode label on it just behind my extended alternator cable.



Mean fuel trims for bank 1 and 2 will tell us more about what the whole fueling system is doing vs just the O2 sensors. Numbers should stay right at 1.0000 or swing just a little up or down and come back.

 

Actually secondary air pump is not there, it should be visible while injectors were done, but no there was no pump for this model.
I will check oxygen sensor value soon ( not today), let's see what is wrong...

 

My car is a 2005 997. 1 C2S with 3.8L engine. Unless yours is a base 3.6 L engine, they should be the same.