Team-BHP > Under the Hood > Technical Stuff

Thread Tools Search this Thread
Old 2nd January 2006, 22:48   #1
Join Date: Dec 2005
Location: Chennai
Posts: 9
Thanked: 0 Times
Default Palio auto revving


Of late am experiencing a problem with my palio (1.2 nv sport). When I take the car in the morning, within the first 3-5 minutes of driving the engine auto revvs even when i take my foot of the gas pedal. It happens only once. After that everything is fine.

Also the car is sluggish at times. I know this is a universal problem with NV model. Is there anything that can be done to get away with the sluggishness?

Appreciate your help.

rammkp is offline   Reply With Quote
Old 3rd January 2006, 12:04   #2
Senior - BHPian
Join Date: Dec 2004
Location: pune
Posts: 2,092
Thanked: 66 Times

Your engine auto-revvs upto what RPM levels? If it happens *only* on cold mornings, then it's normal phenomenon. (Engine RPM going upto 1200 rpm and then falling down to ~800 rpm over a minute or two). If not, it may be an ECU problem. Get it checked.
RX135 is offline   Reply With Quote
Old 3rd January 2006, 12:10   #3
Senior - BHPian
DCEite's Avatar
Join Date: Sep 2004
Location: NCR
Posts: 3,140
Thanked: 801 Times

Yes the engine Auto revvs in almost all MPFI cars. There is nothing unusual about it Remember the good old carb 800 days when the car does not start in the morning if you dont revv hard?.. MPFI systems are smart. They know that the engine is cold and needs revving. So it auto revvs.

As for the sluggishness, i have heard many people complain this about NV model. This is partly due to the fact that the NV model was a more "Fuel efficiency" tweaked model at the cost of performance. There is a lot of detail that goes into that, i dont think i would able to explain it here.

DCEite is offline   Reply With Quote
Old 3rd January 2006, 22:37   #4
tsxei's Avatar
Join Date: Nov 2005
Location: Coimbatore
Posts: 164
Thanked: 0 Times

Auto-revving on cold starts is normal like RX135 and dceite say. The engine rpm should drop to the idle speed when the ECU thinks that the engine is warmed up enough. I always let the rpms drop down to "idle" before pushing off. I also try not to rev hard for the first 10 minutes or so of driving from a cold start. Everything is rough and feels crude when it is cold. If you have a manual transmission car you might even feel that your shifts are not smooth. Give the car a few minutes to warm up and everything will be fine.
tsxei is offline   Reply With Quote
Old 30th March 2006, 21:16   #5
Join Date: Feb 2005
Location: mumbai
Posts: 66
Thanked: 2 Times

faced this auto reving myself but arbid not only on cold starts. turned out to be crud/build p in the throttle body idle valve unit. fortunatly solved with a couple of applications of carb cleaner spray.
air870 is offline   Reply With Quote
Old 31st March 2006, 08:25   #6
Join Date: Feb 2005
Location: Hyderabad
Posts: 529
Thanked: 14 Times

It happenes the same on my Optra...
it happenes on all MPFI cars i even say it happen on M800 Mpfi...
so it's normal...
zulfikar is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
High Revving the Honda City Vtec GTO Technical Stuff 34 25th June 2009 23:17
Under-revving on my Baleno Samurai Technical Stuff 174 7th November 2008 18:03
S10 engine revving on its own 16v100bhp Technical Stuff 19 18th January 2007 21:20
A Story of two guys and two high revving machines GTO Street Experiences 11 13th December 2005 10:28
citroen revving up for India devarshi84 The Indian Car Scene 16 14th October 2005 19:59

All times are GMT +5.5. The time now is 19:25.

Copyright 2000 - 2020,
Proudly powered by E2E Networks