hello all.. :)
i have a volvo v40 GDI 2000.....the engine is hunting when idling ,...it has been on the computor which indicates it is running to rich...but not where the problem is...the lamba sensor has been changed still the same .....ANYONE GOT ANY IDEAS ....THANKS

Welcome.

Check for borken Vaccum lines or leaks.

Welcome, Taff!
:)

I have read the engine becomes dirty by unburned carbon substances due to European fuels which the GDI cannot take.

sounds like you need the volvo de-coke recall , loads of gaskets loads of labour , but we do about 2 a month GDI'S are babba

hi.... what decoke recall? I know most GDIs seem to coke up, but I didnt know there was a recall.

i think i may have found an easy way to fix this problem, i have been working on my gdi engine today because it failed the mot on emissions, i will post after the cars been for a retest and let you know the results.

the car passed the mot and has been fine since, if you want to know how it was done i can post it up for you.

Yes please - if you know a safe, effective & economical way to decoke a GDI then post away!

Look forward to hearing from you.

BB
:beer:

Still no reply on this

hi all,

mine has just failed its mot on emissions.

the guy at the garage said i need to take it to someome with a diagnostic machine but they will just change the lamda sensor and cat till the emmisions go down.(v expensive)

i am going to try changing the oil and going for a thrash down the motorway (this worked on my golf gti)

it has very low idling for ages and sometimes keeps revving itself till it cuts out. had a quick decoke once done free by the guy who services it (dont know what he did?)

anyone any other ideas???

Mines got a TUV (MOT) in August and I have the same problem, can´t see the emmisons being ok, it also smells of fuel.

got it through the emissions test. the old flush / oil change / shell optimax and a good thrash cleared it out.

the mot tester had a problem getting it to tick over. he cleaned the throttle housing which improved it enough to get it through the test.

i had to start it 10 times to get it to tickover for 20mins whilst the flush worked.
it ticks over so low it starts revving itself before eventually cutting out.

strangely though when it started to get really hot (97deg) it ticked over perfectly at around 800rom.

can anyone explain this bizarre behaviour!!!
:puzzled: :puzzled: :puzzled:

Isn´t Shell optimax that expensive fuel, its called "V Power" in Europe I think.

I thought high octane fuel wasn´t good for the GDI engine.

Mine keeps revving up and cutting out also, but only when the outside temperature is around 20°c.When its colder this doesn´t occur.

try using the engine decoking spray that you can buy, it cost about £20 but it sorted mine out

Sorry about the delay, my car passed the mot in 2006 no problems and passed in 2007 with no problems, i will get some photos of the work i done if your interested

My V40 just failed its MOT because of emissions test. The owner of the garage is a great guy and told me that it had just about passed and when they went on to the 2nd stage of the emissions test the CO level went right above the limit so it failed. He asked me if I did long runs and I told him I travel 60 mils to and from work daily and he said that to give it a few runs in a lower gear to burn off the CO. He has also given me Forte Advanced Formula Gas Treatment to put into my engine when the tank is half full then give it a good old blast. I will update you next Mon morning after the retest. He did say that it was down to thw GDI engine and the coking levels. If that doesnt work then possibly have to get new Cat or Lambda.

She passed but only just. He did the retest and it was worse as the engine system light came on and the airflow light. He then went onto paln B which didnt work but it got the alarm lights off. They then tweaked about with it and it passed.

Mine does something similar.

Any idea what tweaking they did to sort out the problem for the MOT?


Thanks