106 GTI misfires on light throttle

Hi,

If I'm touching the throttle very lightly (for instance, trying to go exactly
30mph in 3rd, particularly when going downhill and I barely have to touch the
pedal), the car feels as if:

a) it's misfiring
b) fuel is coming through in spurts, or
c) the ecu can't decide whether the gas pedal is pressed or not, so it
alternates between the two once or twice a second.

These are just my non-technical guesses, it could be something completely
unrelated. It's pretty violent in the lower gears (in first, it feels as
though I'm taking my foot on and off the gas pedal repeatedly). To get past
the problem, I give it a little more gas, but since this propels me towards the
car in front much faster, I have to back off for a bit, then accelerate again,
so I end up sort of kangarooing along the road... I have the throttle cable
set up pretty slack (I think it's about 4 notches down from being too tight) so
it's reasonably smooth, but even when it's tighter I have the same problem.

My car's a 98S - any ideas what this might be? It bugs the hell out of me, but
any time I'm at the garage it's usually okay

Thanks,
Graeme.

 

Likely candidates are...

- Lambda Sensor
- MAP Sensor
- Throttle Potentiometer


Get it to the dealer and have it hooked up to the diagnostic computer, this
will tell you the problem and you can get it sorted before you do any
damage.

 

Strange this cos mine does this and it really gets on my tits. You
will pull along in traffic at about 5 to 10mph and then let of the
pedal, the car slows then suddenly SLOWS like i put on the brake or
someone suffocated the car. Does it in other gears too. I just put
it down to a pretty screwed up car. Have no idea what it is, tried
injector treatment, changed map sensor, changed air filter and oil,
plugs, adjusted throttle thingy and it still does it. I tend to get my
own back cos i periodically floor the shite out of it to try and clear
it to no avail. Mind you I have a 95 306 XT and they had fuel probs.
Mine pinks like hell in summer and I cant do a thing about it. Im
looking for an engine transplant, problem solved phone soon type
solution to an otherwise obscure problem.

scott

 

When mine started to pink I went to Peugeot. I over time went to
Peugeot 5 times for the same thing, although after a couple of times
they said I needed a new map sensor which I gladly bought and it
reduced my pinking by no end. My car doesnt like heat and as soon as
the needle goes over 90 degrees it pinks under medium acceleration or
up hills. In the end Peugeot tell me its the grade of petrol i use
and the fact that i used Tesco petrol. I used other petrol from
elsewhere and it DID get better but didnt go away. I just put up with
it now but have read in a few places that the 1.6 XT had finniky fuel
probs so I just put up with it now. Sounds awful in a built up area
mind!!

Apparently it seems that old methods are still used to diagnose
problems. They get a fault code which tells the mechanics where the
prob is and then they go through all the possible combinations which
could be causing the problem. I dont go to peugeot now, unless its
for something that i feel requires a genuine peugeot part regardless
if the equivalent can be bought elsewhere for cheaper.

If you take your pug to ur dealer they will give u a list of things ur
prob could be. Lambda sensor, nok sensor, map sensor, air filter,
oil, plugs, grade of petrol, all of these things they will GUESS at,
all of which are not cheap and all of which rely on something else for
it to do its job properly. Ive tried all of these listed remedies and
none worked. Seems that its just "one of those things".

happy happy joy joy!

scott