Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 13th September 2007, 22:20   #61
BHPian
 
chetanhanda's Avatar
 
Join Date: Mar 2005
Location: Toronto
Posts: 886
Thanked: 42 Times
Default

Quote:
Originally Posted by Mpower View Post
Chetan, are you assuming that all cars have EGR. I'm not so sure that is true.
Also, blowby gases that are trapped into the crankase (PCV) and put into the intake downstream of the TB which suggests they shoudld go right into the engine rather than flow back and clog the TB.
The EGR s usually there in all new MPFI cars and GTO's car is a D15 vtec so definately it has one.
chetanhanda is offline   Reply With Quote
Old 14th September 2007, 01:13   #62
Senior - BHPian
 
veyron1's Avatar
 
Join Date: Mar 2005
Location: Mumbai
Posts: 1,426
Thanked: 37 Times
Default

Quote:
Originally Posted by chetanhanda
dude dont be so positive abt this..
Skoda = MAF
Cedia = MAF
Old indian ford escort = Alpha-n
Skoda- models sold in India= 1.9TDi & VRS (both boosted).
Cedia- Haven't checked the 4G94. Nice to know that it has an MAF.

Again, about alpha-n; okay, the Escort has an MAF. If it's running alpha-n, that's news to me as well. But I still do not get what alpha-n has to do here.

Quote:
Originally Posted by chetanhanda
dude can you please explain again as Im not able to get it...
All engines start in choke mode when cold. Mixture runs rich for the first 60-90 seconds. Haven't you seen the engines idling 2-300 RPM above normal when cold? This stabilizes once the engine is warm. It's common for all MPFI's from Maruti to Hyundai. And regarding the cars that I have seen which have had the idling problem, I also have to admit that the MAP sensors were also changed. Some under warranty.

Quote:
Originally Posted by chetanhanda
You wouldn't need a Idlecontrol valve's air supply when you are getting air via the main TB.
Yes, I'm aware of that. What I was implying was that I wasn't aware that the ECM cuts off return values once the TB moves off "0" position.

Quote:
atleast some here agrees
I wasn't disagreeing on anything. I was just trying to mix theory with the practical work that I've seen. I'm a novice, still at the bottom of the learning curve....

Last edited by veyron1 : 14th September 2007 at 01:14.
veyron1 is offline   Reply With Quote
Old 15th September 2007, 02:40   #63
BHPian
 
chetanhanda's Avatar
 
Join Date: Mar 2005
Location: Toronto
Posts: 886
Thanked: 42 Times
Default

Quote:
Originally Posted by veyron1 View Post
All engines start in choke mode when cold. Mixture runs rich for the first 60-90 seconds.
dude who calls it choke mode ? anyways I got your point ..

Quote:
Originally Posted by veyron1 View Post
Haven't you seen the engines idling 2-300 RPM above normal when cold? This stabilizes once the engine is warm. It's common for all MPFI's from Maruti to Hyundai. And regarding the cars that I have seen which have had the idling problem, I also have to admit that the MAP sensors were also changed. Some under warranty.

veyron sir I know exactly what happens when engine is cold but thanks for the valuable inputs.
we usually say the ecu is in open loop, choke mode is a new term for me...
chetanhanda is offline   Reply With Quote
Old 15th September 2007, 10:33   #64
BHPian
 
doomsday's Avatar
 
Join Date: Mar 2006
Location: Bangalore
Posts: 420
Thanked: 4 Times
Question

Quote:
Originally Posted by chetanhanda View Post
The EGR s usually there in all new MPFI cars and GTO's car is a D15 vtec so definately it has one.
Are you referring to the engine code? If you are, AFAIK the engine code for the OHC VTEC in India is B15. The D15 series of Honda engines never made it to the Indian market.
doomsday is offline   Reply With Quote
Old 15th September 2007, 21:27   #65
BHPian
 
chetanhanda's Avatar
 
Join Date: Mar 2005
Location: Toronto
Posts: 886
Thanked: 42 Times
Default

Quote:
Originally Posted by doomsday View Post
Are you referring to the engine code? If you are, AFAIK the engine code for the OHC VTEC in India is B15. The D15 series of Honda engines never made it to the Indian market.
D = d series
15,16,17 = cc i.e 1600,1700 or 1500 cc
thats why I call it D15 by mistake.
I know its an asian model but plz remember it is very similar to a USDM D series.
.. but I got ur point asian honda city is named differently
but its not a totally diff type of engine...
chetanhanda is offline   Reply With Quote
Old 15th September 2007, 23:20   #66
BHPian
 
doomsday's Avatar
 
Join Date: Mar 2006
Location: Bangalore
Posts: 420
Thanked: 4 Times
Talking

Quote:
Originally Posted by chetanhanda View Post
D = d series
15,16,17 = cc i.e 1600,1700 or 1500 cc
thats why I call it D15 by mistake.
I know its an asian model but plz remember it is very similar to a USDM D series.
.. but I got ur point asian honda city is named differently
but its not a totally diff type of engine...
I understand the Honda Engine nomenclature somewhat. Guessed you might be referring to the same engine but D15 is the nomenclature in the USDM. Yeah, the B15 only came in the Asian market. Since you are usually very specific technically, while posting; I even thought it might be a typo.
doomsday is offline   Reply With Quote
Old 16th September 2007, 15:22   #67
GTO
Team-BHP Support
 
GTO's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 47,749
Thanked: 89,399 Times
Default

4 days up and the car is still revving over 7100 rpm. Last I checked, the limiter kicked in at 7500 rpm
GTO is offline   Reply With Quote
Old 16th September 2007, 18:47   #68
BHPian
 
doomsday's Avatar
 
Join Date: Mar 2006
Location: Bangalore
Posts: 420
Thanked: 4 Times
Talking

Quote:
Originally Posted by GTO View Post
4 days up and the car is still revving over 7100 rpm. Last I checked, the limiter kicked in at 7500 rpm
I say, take the car to the Honda authorized service and show them whats happening. I'm sure they won't have a clue about what is wrong... You'll have a good time. You can pretend to be upset about the whole thing. These ASSs should get their due sometimes.

Last edited by doomsday : 16th September 2007 at 18:48.
doomsday is offline   Reply With Quote
Old 25th September 2007, 15:35   #69
BHPian
 
Join Date: Jun 2007
Location: Mumbai
Posts: 189
Thanked: 6 Times
Default

My car Ikon 1.6 has RPM problem too.

At stand-still, when I press & release throttle the RMP takes about 2 seconds to come back to idle. I take this to be normal.

On the move, say 60-70 kmph, I release throttle, press clutch & put gear to neutral, the RMP stays high. It remains high even after long period. In neutral with clutch fully depressed I start decreasing speed, the RPM gradually lowers. It comes back to idle when I am stand-still or almost.

Clutch seems okay as I can engage all gears effortlessly. Including reverse.
Driving is quiet unpleasant in this condition as I am unable to use engine braking efficiently.

Will appreciate any help.
kaynmantis is offline   Reply With Quote
Old 25th September 2007, 16:44   #70
BHPian
 
im_srini's Avatar
 
Join Date: Sep 2006
Location: Portland
Posts: 956
Thanked: 368 Times
Infractions: 0/1 (5)
Default

This is regarding the question posed by QuickSilver, I too have pondered the same. Isn't positioning the O2 sensor in a single cylinder's exhaust pipe a rather inaccurate way to measure stoichiometric ratio ? Or is the difference trivial enough to ignore ?
im_srini is offline   Reply With Quote
Old 27th September 2007, 22:20   #71
Senior - BHPian
 
Join Date: Nov 2006
Location: Vizag
Posts: 1,986
Thanked: 1,343 Times
Default

I saw this higher idling problem in my cousin's 3 day old Maruti SX4. As soon as the car is started the rpm shoots to 12-1300. After a few seconds it settles around 800. Now that's ok. It's not such a big problem. But what is very irritating is that even while driving the rpm keeps shooting every time you press clutch to change gears. It is very irritating in city driving because after changing gear when you release clutch the car just jerks forward as though it would hit the rear bumper of the car ahead. Any idea where the problem lies.
pgsagar is offline   Reply With Quote
Old 28th September 2007, 00:41   #72
BHPian
 
rdkarthik's Avatar
 
Join Date: Sep 2005
Location: bangalore
Posts: 206
Thanked: 11 Times
Default

Few things that can help us all

1.Most cars with MAF also have a MAP sensor.

2. Idle Air Control still has a lot of work to do even when throttle goes from 0 to wherever. Thats where drivability comes in.

3. Rev limiter on almost all cars is based on time between reference signals ( cmp , ckp) and not on analog voltage

4. ECM resets cannot increase rev limit.
rdkarthik is offline   Reply With Quote
Old 28th September 2007, 13:40   #73
GTO
Team-BHP Support
 
GTO's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 47,749
Thanked: 89,399 Times
Default

Quote:
. As soon as the car is started the rpm shoots to 12-1300. After a few seconds it settles around 800.
Normal for any MPFi car when cold.
GTO is offline   Reply With Quote
Old 28th September 2007, 13:47   #74
Senior - BHPian
 
Shan2nu's Avatar
 
Join Date: Feb 2004
Location: Hubli - Karnata
Posts: 5,525
Thanked: 87 Times
Default

Quote:
4 days up and the car is still revving over 7100 rpm. Last I checked, the limiter kicked in at 7500 rpm
Same thing on my Vtec. Ever since the O2 sensor conked off, i've been able to revv past 7100. I've taken it to around 7400 without cutoff (didn't wanna go any higher).

But i generally shift at 6900-7000 so it's not that big a deal for me.

Shan2nu
Shan2nu is offline   Reply With Quote
Old 28th September 2007, 16:26   #75
GTO
Team-BHP Support
 
GTO's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 47,749
Thanked: 89,399 Times
Default

Quote:

Same thing on my Vtec. Ever since the O2 sensor conked off, i've been able to revv past 7100. I've taken it to around 7400 without cutoff (didn't wanna go any higher).
LOL! A third known example of this.

@ rdkarthik : How?
GTO is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
OHC Suspension Problem EDIT : Solved! KSM-Vtec Technical Stuff 101 13th January 2014 21:08
Linea Diesel: No one is able to solve engine problem EDIT: Now solved ! Travelbug Technical Stuff 35 21st November 2013 23:39
Strange problem with my petrol Swift. EDIT : NOW SOLVED abhaybakshi Technical Stuff 50 11th June 2012 13:01
Vibrations in Baleno at all times (Low varying Idle RPM) rohanmeets Technical Stuff 8 25th February 2008 11:36
Idling problem in my WagonR Lxi..EDIT : Now solved. ramki067 Technical Stuff 8 17th December 2007 11:19


All times are GMT +5.5. The time now is 22:59.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks