(21-07-2012, 01:44 AM)BlackSix Wrote: ive got the same thing going on with my gti 6. ive hooked it up to a code reader and it comes up with no codes (snap on modus)
before it came up with lambda malfunction so i replaced that, ive changed the spark plugs but no joy and ive tried replacing each coil pack with a known good one, still no joy.
Right... thats now the second person who has the same fault and replaced very similar items (lambda sensors) so it must be a common problem with no clear solution. I've seen the question asked so many times and yet no defining answer....
so... lambda sensor code, replaced which showed no code, so.. it's likely it isn't sensor related.
coming from owning classic cars, this kinda thing was pretty normal and was "p*ss to sort out"
usually its either a duff/weak plug
weak or failing contact on a HT lead or an amplifier module
fuel starvation through a damaged diaphragm in the fuel pump or partially blocked fuel filter.
if the problem persisted after checking the above (not replacing parts willy nilly) I'd then I'd start investigating inlet manifold gaskets for air or fuel leaks, as either one will disrupt the balance of fuel and air mixture.
the only other things I could think is... oxidized contacts on the ecu and connections.
Possibly "possibly?" throttle position sensor "IF" the 306 has one...
or... brake servo (if it feels it needs to top up the pressure and raises engine speed to create enough pressure?) finally... power steering at fault somewhere.... as that too can raise the engine Rpm
I've searched for a fair few hours all over peugeot and french car related forums surrounding this very problem and have found NO answer. when it comes to people explaining the same issues the posts appear to go quiet and no further posts etc (many where it sounds like the OP has given up!)
surely they can't run like this normally? surely they are supposed to be a nice smooth even steady tick over speed?
just had a thought....
take a look at that induction pipe that connects to the air scoop at the front grill.. (that furry pipe) where it connects on to the scoop at the front grill, if it isn't a tight fit, it is possible that air could be faulting the readings causing more air to enter than required and pulling more fuel through, richening the mixture, causing the revs to for a second.. flutter up and fall again.
aside from the cleaning the ICV out and resetting it, MAF sensor? possibly, known a few MAF sensors not to come back as faulty when they were. ( I don't take all diagnostic readings as gospel anymore).
Thanks
rob