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Author Subject: Slight hesitation every now and again??
mattgti6phase2

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Post #1
As above, when the engine is up to running temperature i get slight hesitation when plodding along. The performance of the car is in no way affected by this. Im drawn to it being a sensor and as discussed with my friend stuwee from here we think it could possibly be the ECU temp sensor.

When the engine is warm i can unplug the said sensor and nothing happens, and today i started the engine from cold with the sensor unplugged and again it ran fine Crazy I also unplugged it again today and it ran like a dog until i plugged it back in. Am i right in thinking its the ECU sensor and that it's working when it wants to or am i thinking towards the wrong sensor?

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Team Nile 6 Superman
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Posted 12th Aug 2012 at 15:14
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BlackSix

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Registered: 30 Jul 2012

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Post #2
which sensor?

along with the lumpy idle mine also does this
Posted 12th Aug 2012 at 15:27
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mattgti6phase2

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Post #3
The green one on the thermostat housing.

________________________________________

Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 12th Aug 2012 at 15:36
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BlackSix

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Post #4
yeah thats the coolant temp sensor mate Smile
Posted 12th Aug 2012 at 15:55
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mattgti6phase2

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Post #5
Yes which is controlled by the ECU Thumbs up

________________________________________

Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 12th Aug 2012 at 16:09
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #6
Yep, green temp sensor is what the ECU reads mate, the blue one is what the temp gauge uses. Wink

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 12th Aug 2012 at 18:57
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mattgti6phase2

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Post #7
Would you say that is what could be causing the hesitation though Stan? I done a google search but what i came up with didnt satisfy me, as said in my first post it's not all the time and when i unplug the sensor it makes no difference.

________________________________________

Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 13th Aug 2012 at 00:00
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #8
I would say Matt that you possibly have a lambda showing its early signs of a imminent failure...
Best thing to do, unplug the lambda and go for a short drive, say 5-10 miles and see if there's a difference. If the problem disappears you need a new one. Wink
It's very easy to disconnect and won't cost you anything to try it out. Thumbs up

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 13th Aug 2012 at 07:04
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mattgti6phase2

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Post #9
My other thought was lambda, I'm sure i can disconnect that Wink

Cheers mate.

________________________________________

Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 13th Aug 2012 at 08:03
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #10
No problem. Thumbs up

It's a black and red 4-pin plug usually found down behind the ECU box. It is a "slide" fitment plug, you will need to pull the tab out of the side of the plug before the two parts will separate. Wink

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 13th Aug 2012 at 11:03
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mattgti6phase2

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Post #11
So following on from this, I had the car put on DIAGNOSTIC at peugeot which came up with 02 sensor permanent fault. The said sensor has now been changed for a brand new item. The reading i now get from the 02 sensor on idle is 0.352 - 0.356MV is this the correct or there about corect reading?

________________________________________

Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 25th Aug 2012 at 14:29
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BlackSix

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Post #12
certainly would explain the symptoms.

does it feel better now?
Posted 25th Aug 2012 at 15:05
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stan_306gti6 Forum Admin

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Registered: 18 Jan 2004

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Post #13
That's pretty much what it should be Matt. Yes

Does the car drive sweet now? Dunno

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 25th Aug 2012 at 15:59
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mattgti6phase2

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Registered: 16 Jul 2010

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Post #14
It idles better for sure. Haven't really driven it yet as I've been looking after the boy today whilst the missus has a little break but I'm going to take it out this eve and put it through its paces.

The bogging down feeling appears to have gone low down in the rpms to. I'm guessing that's due to the correct amount of fuel/air being used.

Only took me 10 mins to install the new 02 sensor. Even though the original one was tight as Fook to undo.

________________________________________

Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 25th Aug 2012 at 17:51
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

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Post #15
What's the verdict then Matt after your test run last night? Dunno

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 26th Aug 2012 at 09:42
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mattgti6phase2

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Location: inside my 6 abusing the tarmac!!

Registered: 16 Jul 2010

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Post #16
Runs sweet as a nut Stan, much more responsive at any given RPM in the rev range. Even the smell from the exhaust is different. It still over fuels but nowhere near as much but i run a decat so that's to be expected.

All is well though brand new lambda FTW Thumbs up

________________________________________

Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 28th Aug 2012 at 00:42
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline
Post #17
Excellent news, happy motoring once again. Cool Thumbs up

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 28th Aug 2012 at 07:31
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