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RPM drop very fast on gear change, when push clutch

Tiny
DAWINCHI
  • MEMBER
  • 2012 RENAULT LOGAN
  • 1.5L
  • 4 CYL
  • FWD
  • MANUAL
  • 31,000 MILES
I have the car listed above (it is called l90 in Iran and made here). When I want to change to higher gear and push the clutch the rpm's drop too fast and when I push gas, the car does not go smoothly and have shakes. What is the problem then?
another thing is when car is standing, if I push gas, when gas return I have shakes and its like the car is going to turn off!
and no error is in dash.
(sorry for bad English)
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Monday, September 11th, 2017 AT 8:03 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,047 POSTS
No problem. It sounds like you have one of two problems; first I would check the throttle bore of coking which is a dark goo over it which will make it not work right.

Here is a guide to help you see what I am taking about:

https://www.2carpros.com/articles/throttle-actuator-service

Next would be a vacuum leak which will cause the engine to hunt for idle which will make it drop rapidly.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please let us know what you find.

Cheers, Ken

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Tuesday, September 12th, 2017 AT 12:57 PM
Tiny
DAWINCHI
  • MEMBER
  • 2 POSTS
I will check throttle.
Thanks a lot.
I changed washer of manifold and throttle for the vacuum, but noting changed.
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Tuesday, September 12th, 2017 AT 1:05 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,047 POSTS
It kind of sounds like the engine is misfiring, have you done a tune up lately?

Here is a guide to help you get the job done.

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

If the plugs are new lets run the codes to see what come up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let us know what you find.

Cheers, Ken
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Wednesday, September 13th, 2017 AT 10:30 AM

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