Mechanics

MY CAR IS DROPPING RPM IN SLOW

2007 Toyota Corolla

My toyota corolla xli 2007 is having rpm dropping problem. Its a manual car. When I pick up from first gear and give it a speed through speed padel it instantly drops the rpm then return back to normal level. Its mostly happening with air conditioner. We tried every possible thing for this like coils checking, changing of plugs, injectors cleaning, throttle body cleaning etc. We also have gone through with car computer scanner. Its all clear and not giving any sort of sensor or other ecm related fault. I am confused about the next step to sort our this problem. Please help me out
Avatar
Newtech_autospk
April 13, 2012.




Check fuel pressure and vacuum at idle. If vacuum is 15" or belwo suspect converter problem.

Hmac300
Apr 13, 2012.
At idle (without gear shifting) its static but at standing position it picks race with a delay. Also in addition to the information, its for a time running on CNG gas but giving this dropping rpm issue in both (with CNG & Petrol)

Can it be a problem of Compressor or compression from valves or piston? What do you feel with overall situation?

Please suggest me about it.
AD

Tiny
Newtech_autospk
Apr 14, 2012.
Running on cng normally requires an engine with a bumped up compression but should haveno effect on your problem. Do the schecks that i've suggested first. You have to have a starting point and not just guess your way through a repair.

Hmac300
Apr 14, 2012.
Thanks for your advises, we already proceed with your suggestions if any problem persists, 'll revert back to you.

Thanks once again.

Tiny
Newtech_autospk
Apr 15, 2012.

AD