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[Explorer]

Good Day Gents.

today while i am driving to my work a feel that the rpm goes little bit down and come back to normal from 3000 to 2950 may be a little bit .as soon as i reach the first taffic light the rpm goes under 500 rpm and the car start shaking and at that time i prsss the gasoline peddle and it comeback to normal . this issue happen some times bit i can not figure out the probleem.

i have change the MAF sensor two days ago but the probleem still there .. can some body give an advise or solution to my probleem

Opel omega 3.2    2002   

thanks and best regard

[rustym95]

sounds like a blocked air pipe.

[Explorer]

Thank you brother

any more replies or observations ?

[tunnie]

check the butterflys are operating smoothly 

[Explorer]

where is the butterfly loacted or does have another name ?

[rustym95]

on the throttle. also check the idler and gaskets on intake.

[tunnie]

right at the front of the plenum, the 2 main air feed pipes come up from underneath into the plenum, the metal section these plastic pipes join to is the thottlebody/butterfly section, this could be sticking open slightly, give a blast with WD40 and make sure its opening smoothly.

[Explorer]

ok.
do you think this probleem is not related to sensors ? like camsensor or crank sensor ?

[Andy B]

where is the butterfly loacted or does have another name ?

Right at the front of the plenum. The butterfly is within the throttle body. If you had an accelerator cable, it would be what the accelerater cable would open, like in the days of a downdraught carburettor.     

[hotel21]

right at the front of the plenum, the 2 main air feed pipes come up from underneath into the plenum, the metal section these plastic pipes join to is the thottlebody/butterfly section, this could be sticking open slightly, give a blast with WD40 and make sure its opening smoothly.

Its a 3.2 and FBW so no cables to lubricate.

If you think its sticking, best thing is to remove the butterfly and clean with carb cleaner.

[tunnie]

right at the front of the plenum, the 2 main air feed pipes come up from underneath into the plenum, the metal section these plastic pipes join to is the thottlebody/butterfly section, this could be sticking open slightly, give a blast with WD40 and make sure its opening smoothly.

Its a 3.2 and FBW so no cables to lubricate.

If you think its sticking, best thing is to remove the butterfly and clean with carb cleaner.

Sorry, i did mean the inside of the butteryflys to blast with WD

[Explorer]

thanks for all of you

[hotel21]

Would also check the hinge pivot for the actual foot pedal in the cabin to see if its sticking.  never looked down there to see whats what, so guessing there is a pivot of some description....

[feeutfo]

also worth a pedal trick, free and easy to do 

[Explorer]

Dear Gents

i alreday cleaned the throttle but sometime while i am stopping i feel that the RPM goes down and up very fast but i can feel because the car seems to be vibrating

is it sound like a probleem in one of the sensor like the cam shaft sensor ??

can you please give me any findings ?