172ph2 hesitant when cold ?

[RS_1985]

As the title says, my 2002 172ph2 is hesitating slightly when driving it straight from cold (to and from work!).

Once the temp. needle gets up to normal running temp. everything is fine? This only takes a few minutes normally. Seems to pull well through gears when up to temp. But just feels as though it's misfiring/lumpy when accelerating for the first couple of miles...

Could it be a lambda sensor?
Doesn't appear to be any mods other than cold air infeeds removed from air box.
I have serviced and replaced plugs and ignition block. Although not changed the leads...

Running about 300 miles per tank, if that's normal?

Any advice appreciated!

 

[JB21]

Sounds like the lambda yeah or coolant/thermo sensor maybe. Mine did it, didn't bother me as once warm it was fine. Try swapping the lambda's around and see if it stops.

 

[JamesBryan]

They do like to eat lambdas

 

[RIC172]

Out of the four 172s/182s I've owned, they've all driven lumpy from cold and take 1-2 miles to smooth out, so I wouldn't worry about it.

You can get your car mapped to improve this if it bothers you.

300 miles is a normal range too depending on how you drive it.

 

[RS_1985]

Cheers for the swift replies!

I'll see how accessible the lambdas are before deciding whether I want to try swapping them or not!

 

[imprezaworks]

Standard exhaust?

 

[RS_1985]

Standard exhaust?

Yes it is.

 

[Pricey98]

Similar symptoms on my 172. Been told by specialist that it may be a sticky injector.

 

[MonkeyKnifeFight]

Mine does this. I usually let it idle for a minute before heading off. Never tried to fix this fault but in my ownership I've replaced plugs, leads, Map sensor, Temp sensor, Crank sensor, injectors, battery, relays and the car still acts the same.

Haven't tried lambda as I couldn't get mine off..

 

[imprezaworks]

Mine does it, the lambda is a bit slow switching.

May look into getting it replaced but doesn’t bother me too much.

 

[donnylad]

mine does this sometimes too, I dont really like to sit there for a few mins though as its loud as feck!

 

[Brigsy]

Mine was doing the same recently misfire from cold for a couple of miles. Everything checked out ok on live data - swapped downstream & post cat lambda and runs fine again better idle etc. Still have an occasional hesitation when pulling away i think an injector is on its way out.

 

[RS_1985]

So verdict is to swap the lambdas and see how that goes!

Cheers!

 

[imprezaworks]

Ive got a replacement to try this week. Will report back

 

[Clio182mike]

My 172 does this but I just give it a minute before setting off when cold. Sometimes it will also start then die so I have to turn it over again but hasn't really bothered me. I'd be interested in seeing what the new lambda sensor does though if you can report back?

 

[imprezaworks]

Will do.

The starting issue with yours is likely to be sensor related.