Right where to start...
Once I got back from afghan i went to pick RIch's beast up from my mates, as soon as i started it I noticed a fuel leak coming from the fuel hose that goes from the high pressure pump to the original filter, I replaced the fuel line that was perished and that sorted that problem.
After driving it for about a week she started giving me s**t....

On cold start she idels at 1500 rpm and shows half s bar boost on tick over... Once warm she ran alright!
As it has an air/fuel ratio gauge I was always keeping an eye out on that, on tick over it showed 13 on the gauge which is normal?
Now the bloody thing shows 15 on tick over which is clearly running lean?
At cruising speed at 2k rpm the gauge is constantly in the red... Not right!!
As I have a spare labda sensor I went to change it thinking that it would have 2, the original one and the one for the afr gauge but that is not the case it just has the one which is the afr gauge so i can't swap it for the spare one as it's different

It's booked in with lynx next week but as the high boost is off the road as iv sold it and my bmw is in for mot I am car'less and don't really want to carry on driving the super high boost as it's running so lean....

Anyone got any ideas what is wrong with her.....


Its totally different to a normal high boost set up do I don't know where to start

I did think about that but it ran alright for around 1000 miles before it started to play up.

Maybe the pump isn't pushing enough fuel through might be worth checking the wiring to it especially the earth?

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Super high boost Completed, destroyer of gearboxes and 160mph club

Was going to fit my brand new 044 pump to see if that makes a difference, problem is I just don't have the time atm so probably won't get round to doing anything before it goes to lynx

15 on the AFR isn't lean its pretty bang on mate 14.7 is perfect "Stoichiometric" AFR for 1.00 lambda reading and complete combustion. Should read about 15 on idle and cruising. I can't see that its the lambda of the wide band AFR gauge one is used for the ecu and as its reading 0.5bar of positive boost at 1500rpm then the boost / map sensor is more than likely at fault.

Be interested to see what they find wrong

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

Sounds like an air leak to me, I've had this before on mine years ago.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone

Iv done a video that I will upload however as it's not a cold start like it would when I drive it for the first time it's not showing the 0.5 bar boost on tick over....

It used to sit around 13.5 on tickover so was in the green so surely that's what it should be??
I can't film and drive at the same time or I would show what it's doing then!
If it had a boost leak would it not be running rich and not lean??

Right I don't know if iv fixed it or not as I'm not sure what the afr gauge should do on/off load, just took it for a drive and the afr just sits at 14.7 no matter if I'm poodling along or booting it!
Before it fluctuated from 11 when I let off upto 16 when booting it but now it's not moving at all lol

yup would run rich when under load but lean on idle. hopefully somethng simple like a sensor gone just check all the sensor connections and vacuume and boost pipes. All you can do without pluging it in tbh.

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

Just like it was when I took you out so god knows what's up with it now

Weird maybe a lose bit of wiring? have a look at the wiring from the map sensor?

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Super high boost Completed, destroyer of gearboxes and 160mph club

Still don't have the beast back, they have spent a few hours on it and have been told that it's s lambda issue, apparently it's not speakIng to the ecu so a wiring issue somewhere
They have put the ecu into safe mode so no damage can be done, should get it back tomorrow but will more than likely need to go back
Wish I had just kept the high boost now, not even sure how much this little issue is going to cost me but it's an expense I could do with out atm!

That's alright mate, do you know who fitted the boost gauge?