Problem with Vtec idling...varying RPM. EDIT : Solved! - Team-BHP

GTO · 10th September 2007, 11:19

This had happened about two months back, but rectified itself automatically. However, since this morning, the problem has resurfaced.

At idling, the RPM keeps on shooting between 800 - 1500 rpm by itself. The car has completed around 52,000 kms and most of you know the minimal mods I have put on it. I didnt want to take a chance so just parked her back in the garage.

Whats up?

iraghava · 10th September 2007, 11:29

Is this happening only with the A/C on?

ajmat · 10th September 2007, 11:31

Sounds like the air intake sensors are dirty. Honda will say replace and 16k whereas the part costs a lot less. You might get away with getting them cleaned for the short term

Rudra Sen · 10th September 2007, 11:36

I'm least knowledgeable here to comment but as Ishan says, you may need to check your vacuum idle switch for AC. Also check if accelerator cable getting stuck.

GTO · 10th September 2007, 11:37

@ Iraghava : Dunno but will be able to check only in the evening now.

@ Ajmat : Anything to do with the K&N plumbing?

Rudra Sen · 10th September 2007, 11:38

Quote:

Originally Posted by ajmat

Sounds like the air intake sensors are dirty.

You mean to say air intake is correct but sensor acting funny?

GTO · 10th September 2007, 11:42

@ irags : Driver just checked. Problem is there even without air-con.

@ Rudra : No problem with accelerator cable.

rdkarthik · 10th September 2007, 11:49

Is the check light coming on?

Chk the O2 sensor, try to get a replacement from another car to test if possible. If thats okay then check MAP sensor - vacuum connection from manifold to sensor, broken/shorted wires, etc.

BUSA · 10th September 2007, 11:54

I think thats something to do with KnN, i have noticed with KnN the car revvs automatically sometimes, maybe drawing in more air.

sushrutha · 10th September 2007, 11:56

I'm new to OHC.
Every morning when I start my OHC 1.3Exi , my car RPM needle raises till 1,300RPM and after 1 min or so it comes down to 750 -800 Rpm mark.
Is this normal ?

Jaggu · 10th September 2007, 12:00

check air leaks as well as air filter > clean the sensors (throttle body and O 2) > then move on to injector cleaning

Jaggu · 10th September 2007, 12:02

Quote:

Originally Posted by sushrutha

I'm new to OHC.
Every morning when I start my OHC 1.3Exi , my car RPM needle raises till 1,300RPM and after 1 min or so it comes down to 750 -800 Rpm mark.
Is this normal ?

normal.. for achieving optimum engine temp its devised

suren181 · 10th September 2007, 12:03

Used to have this problem on a regular basis on my Santro. The solution for me was to change the petrol pump after removing the old petrol that was in the tank. Have been poring petrol from select pumps and ever since have not had this problem. Well, might not be the remedy but just my experience.

mclaren1885 · 10th September 2007, 12:18

Even I am having the exact same problem and added to that my engine goes off everytime the needle comes below 1000 rpm. My car will be going in tomorrow to rectify this idling issue. Will keep this thread updated on what was carried on.

But by the looks of it could it be:
1. IAC valve malfunction?
2. TPS malfunction?
3. Vacuum leak?
4. Cam position sensor malfunction?

Karthik, in my case there is no check light & O2 sensor seems to be working fine. Because when I run with the O2 sensor disconnected I get really bad FE. And it betters by a lot when I connect it back.

rchimni · 10th September 2007, 12:33

I too developed this problem in my car after the throttle body was cleaned , it did somehow rectify itself ..

10th September 2007, 11:19	#1 (permalink)
GTO Super-Admin Join Date: Feb 2004 Location: Bombay Posts: 12,185 View My Garage	Problem with Vtec idling...varying RPM. EDIT : Solved! This had happened about two months back, but rectified itself automatically. However, since this morning, the problem has resurfaced. At idling, the RPM keeps on shooting between 800 - 1500 rpm by itself. The car has completed around 52,000 kms and most of you know the minimal mods I have put on it. I didnt want to take a chance so just parked her back in the garage. Whats up? __________________ GTO Change the way you think, and watch the world change around you. Please don't PM for support. Use the Contact Form instead. Please read the NEW Team-BHP FAQ section for all your queries.

10th September 2007, 11:29	#2 (permalink)
iraghava Distinguished - BHPian Join Date: Oct 2005 Location: Bhaiyyaland Posts: 7,332 View My Garage	Is this happening only with the A/C on? __________________ There is a very fine line between "Hobby" and "Mental Illness".

10th September 2007, 11:31	#3 (permalink)
ajmat Team-BHP Moderator Join Date: Feb 2004 Location: Bangalore Posts: 5,213 View My Garage	Sounds like the air intake sensors are dirty. Honda will say replace and 16k whereas the part costs a lot less. You might get away with getting them cleaned for the short term __________________ I love the whoosh, but i miss the bellowing

10th September 2007, 11:37	#5 (permalink)
GTO Super-Admin Join Date: Feb 2004 Location: Bombay Posts: 12,185 View My Garage	@ Iraghava : Dunno but will be able to check only in the evening now. @ Ajmat : Anything to do with the K&N plumbing? __________________ GTO Change the way you think, and watch the world change around you. Please don't PM for support. Use the Contact Form instead. Please read the NEW Team-BHP FAQ section for all your queries. Last edited by GTO : 10th September 2007 at 11:41.

10th September 2007, 11:42	#7 (permalink)
GTO Super-Admin Join Date: Feb 2004 Location: Bombay Posts: 12,185 View My Garage	@ irags : Driver just checked. Problem is there even without air-con. @ Rudra : No problem with accelerator cable. __________________ GTO Change the way you think, and watch the world change around you. Please don't PM for support. Use the Contact Form instead. Please read the NEW Team-BHP FAQ section for all your queries.

10th September 2007, 11:36	#4 (permalink)
Rudra Sen Team-BHP Moderator Join Date: Apr 2004 Location: Bangalore Posts: 3,681 View My Garage	I'm least knowledgeable here to comment but as Ishan says, you may need to check your vacuum idle switch for AC. Also check if accelerator cable getting stuck.

10th September 2007, 11:49	#8 (permalink)
rdkarthik BHPian Join Date: Sep 2005 Location: bangalore Posts: 178	Is the check light coming on? Chk the O2 sensor, try to get a replacement from another car to test if possible. If thats okay then check MAP sensor - vacuum connection from manifold to sensor, broken/shorted wires, etc.

10th September 2007, 11:54	#9 (permalink)
BUSA Senior - BHPian Join Date: Aug 2005 Location: Bombay Posts: 5,066 View My Garage	I think thats something to do with KnN, i have noticed with KnN the car revvs automatically sometimes, maybe drawing in more air. __________________ thecarsandmore.blogspot. com

10th September 2007, 11:56	#10 (permalink)
sushrutha BHPian Join Date: Mar 2006 Location: Chikmagalur/Bangalore Posts: 360 View My Garage	I'm new to OHC. Every morning when I start my OHC 1.3Exi , my car RPM needle raises till 1,300RPM and after 1 min or so it comes down to 750 -800 Rpm mark. Is this normal ? __________________ Honda City Maruti ZEN - SOLD Maruti 800 Bajaj Pulsar

10th September 2007, 12:00	#11 (permalink)
Jaggu Team-BHP Moderator Join Date: May 2004 Location: Bangalore Posts: 3,633	check air leaks as well as air filter > clean the sensors (throttle body and O 2) > then move on to injector cleaning __________________ The strength to change what I can, the inability to accept what I can't, and the incapacity to tell the difference. -Calvin

10th September 2007, 12:03	#13 (permalink)
suren181 BHPian Join Date: Aug 2006 Location: Hyderabad Posts: 410 View My Garage	Used to have this problem on a regular basis on my Santro. The solution for me was to change the petrol pump after removing the old petrol that was in the tank. Have been poring petrol from select pumps and ever since have not had this problem. Well, might not be the remedy but just my experience.

10th September 2007, 12:18	#14 (permalink)
mclaren1885 Senior - BHPian Join Date: Jul 2005 Location: Bangalore (the city of modded cars) !! Posts: 3,796 View My Garage	Even I am having the exact same problem and added to that my engine goes off everytime the needle comes below 1000 rpm. My car will be going in tomorrow to rectify this idling issue. Will keep this thread updated on what was carried on. But by the looks of it could it be: 1. IAC valve malfunction? 2. TPS malfunction? 3. Vacuum leak? 4. Cam position sensor malfunction? Karthik, in my case there is no check light & O2 sensor seems to be working fine. Because when I run with the O2 sensor disconnected I get really bad FE. And it betters by a lot when I connect it back. __________________ I am proud of you, binzy boy !!! Keep up the good work. Last edited by mclaren1885 : 10th September 2007 at 12:20.

10th September 2007, 12:33	#15 (permalink)
rchimni BHPian Join Date: Dec 2004 Location: Manila Posts: 133 View My Garage	I too developed this problem in my car after the throttle body was cleaned , it did somehow rectify itself ..

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