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My car is dropping RPM in slow

Tiny
NEWTECH_AUTOSPK
  • MEMBER
  • 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
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Friday, April 13th, 2012 AT 6:38 AM

4 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure and vacuum at idle. If vacuum is 15" or belwo suspect converter problem.
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Friday, April 13th, 2012 AT 2:22 PM
Tiny
NEWTECH_AUTOSPK
  • MEMBER
  • 3 POSTS
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.
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Saturday, April 14th, 2012 AT 5:37 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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.
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Saturday, April 14th, 2012 AT 1:43 PM
Tiny
NEWTECH_AUTOSPK
  • MEMBER
  • 3 POSTS
Thanks for your advises, we already proceed with your suggestions if any problem persists, 'll revert back to you.

Thanks once again.
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Sunday, April 15th, 2012 AT 11:13 PM

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