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Author Subject: Hunting/Stalling
Boab

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Location: Chasing Haggis

Registered: 23 Apr 2005

Posts: 1,556

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Post #1
Recently changed my Lambda sensor (for 2nd hand one) due to overfuelling. Was working fine to start with but now i have a problem when starting from cold.

On first starting the rev needle doesn't move for at least 5-10 seconds then jumps up, if i don't keep the revs up the car will stall on me. Also when pulling away, especially when i get to 2nd,3rd or 4th gear the car hunts a lot until warmed up.

Is this the Lambda or is it the ICV which has been suggested to me already?

Cheers

________________________________________

PH3 Team Astor™GTi 6 owner
Posted 21st Feb 2010 at 22:33
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iplay

Seasoned Pro

Location: Number Wang

Registered: 18 May 2006

Posts: 3,268

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Post #2
Do you have an exhaust leak between the exhaust manifold and the catalytic converter? Could be that the firing ring has disintegrated and lets air into the cat effecting running until the manifold warms up and seals it tight?

OT: I am moving house soon ... do you have any more super sky deals? Whistle
Posted 22nd Feb 2010 at 05:19
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Boab

Seasoned Pro

Location: Chasing Haggis

Registered: 23 Apr 2005

Posts: 1,556

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Post #3
iplay wrote:
Do you have an exhaust leak between the exhaust manifold and the catalytic converter? Could be that the firing ring has disintegrated and lets air into the cat effecting running until the manifold warms up and seals it tight?

OT: I am moving house soon ... do you have any more super sky deals? Whistle


I don't think so but i am getting strong smelling exhaust fumes now so will look into that.

I'll PM you about sky later mateWink

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PH3 Team Astor™GTi 6 owner
Posted 22nd Feb 2010 at 14:15
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justinaccurate

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Location: Cov

Registered: 29 Apr 2006

Posts: 14,425

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Post #4
I'm thinking maybe MAP?
Posted 23rd Feb 2010 at 00:22
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greenbelt

Seasoned Pro

Location: How's Life In London?

Registered: 23 Apr 2006

Posts: 1,961

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Post #5
MAP sensor Yes

Does the car kangaroo when you gun it?

________________________________________

Standard Black 6
Black HBSC6 Smoke
Posted 23rd Feb 2010 at 01:03
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Boab

Seasoned Pro

Location: Chasing Haggis

Registered: 23 Apr 2005

Posts: 1,556

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Post #6
greenbelt wrote:
MAP sensor Yes

Does the car kangaroo when you gun it?


it does mate, will try that first then. cheers guys

________________________________________

PH3 Team Astor™GTi 6 owner
Posted 23rd Feb 2010 at 02:26
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Boab

Seasoned Pro

Location: Chasing Haggis

Registered: 23 Apr 2005

Posts: 1,556

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Post #7
Ok going to finally get round to sorting this problem out at weekend. quick question, can i clean the MAP sensor in anyway or does it have to be replaced?
I'm also going to clean stepper motor and check the coolant temp sensor. How is the best way to test the temp sensor?

Cheers

________________________________________

PH3 Team Astor™GTi 6 owner
Posted 11th Mar 2010 at 21:21
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Boab

Seasoned Pro

Location: Chasing Haggis

Registered: 23 Apr 2005

Posts: 1,556

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Post #8
Right, had a bash at this today. Got ICV/stepper motor out and cleaned it with WD40 inc the housing.I also checked connection for the temp sensor. Took the Map sensor off but had no idea what to do with it so put it back on Laugh

After completing an ECU reset i have found the hunting seems to have gone. I only now have an issue on first start up where the revs jump over 1000 rpm then drop to almost a stall then go back up and settle on 950 rpm.

Any further ideas on this?

Cheers

________________________________________

PH3 Team Astor™GTi 6 owner
Posted 16th Mar 2010 at 19:18
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scott.n

Junior User

Location: Lanarkshire

Registered: 16 Feb 2010

Posts: 73

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Post #9
Mines still sometimes does this and i have changed , map , stepper , cleaned other sensors etc lol still no joy with mine
Posted 16th Mar 2010 at 20:50
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:: blade ::

Senior User

Location: Altrincham

Registered: 21 Aug 2007

Posts: 697

Status: Offline
Post #10
had the same prob with mine, just done a ECU reset and cleaned all the sensors, so goin out for a drive in a min to see if all is well Smile

________________________________________

Black Ph1 XSi-6
161.8BHP (Getting Better!!!!)
Posted 17th Mar 2010 at 01:24
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justinaccurate

Seasoned Pro

Location: Cov

Registered: 29 Apr 2006

Posts: 14,425

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Post #11
Try disconnecting the plug from your throttle position sensor. They run fine without it; just revs a bit higher on start up, its free to try. Might need a mirror to see where it is tho (big white thing on the underside of throttle body)
Posted 17th Mar 2010 at 01:37
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kit

Seasoned Pro

Location: Location: Location:

Registered: 22 Jan 2009

Posts: 2,394

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Post #12
I would replace the ICV. If you have cleaned your current one it may well be knackered beyond use.

________________________________________

Racing driver, fighter pilot, astronaut, compulsive liar.
Posted 17th Mar 2010 at 04:08
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:: blade ::

Senior User

Location: Altrincham

Registered: 21 Aug 2007

Posts: 697

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Post #13
well been for the drive, and all went well, usually its starts doing it after 10 or so mins, lasted a lil longer this tims and did it after about 30mins, but doesnt stay as long, then will go, then 5mins after will do it again :S, ive changed the icv,

________________________________________

Black Ph1 XSi-6
161.8BHP (Getting Better!!!!)
Posted 17th Mar 2010 at 04:15
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Boab

Seasoned Pro

Location: Chasing Haggis

Registered: 23 Apr 2005

Posts: 1,556

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Post #14
Thought i would update this.

Looks like the Map sensor was the culprit.

Got one from CUJ on here and replaced it today, done an ECU reset then went a drive and no stalling at all. Was even trying to make it stall and it didn't Big grin. Hunting seems to have gone completely too.

Cheers for all the help Thumbs up

________________________________________

PH3 Team Astor™GTi 6 owner
Posted 4th Apr 2010 at 00:44
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