Car is quite lumpy/jumpy on start up but fine after 500yards/warm up

[Paddy_g46]

When I start my car it can be quite jumpy/jerky when i pull away, I find it is worse when the weather is quite cold. It is fine after 1-2 mins of warming up or if I drive few a few hundred yards. Would I be right in saying this may be a dodgy Lamda? Also I think the car may be over-fuelling slightly, again lambda?

Patrick

 

[Homer-Simpson]

Happens to me too, I think I will get Fred to check it out next time I am there Seems to be getting worse and worse too

 

[Gib#244]

Has it a Decat? Mine did this when decatted. Changed it back and working fine

 

[DrR]

They all do it?

 

[maupineda]

Mine did it with the latest cal available from fastchip. with my custom one it does not.

 

[kevin.s]

mine does it too mate. i think they all do it to a cirtain degree but if you have a de cat on like me then it makes it worse if its not mapped to run with it.

 

[Gez08]

clean throttle body fit new tps (crank) sensor, mite help a little

 

[EngineerD]

Valvers' do that, live with it!

 

[Paddy_g46]

Yeh it has no cat, straight through from manifold

Valvers' do that, live with it!

:dapprove:

It hasnt always done it....

 

[Martin_172]

they all do it, vvt doesnt engage untill a certain engine temperature is reached causing them to run like a bag of s**t.

 

[sideways danny]

rofl at all the mk2 owners


Could be lambda, but more likely coolant sensor

 

[Paddy_g46]

rofl at all the mk2 owners


Could be lambda, but more likely coolant sensor

What else does the coolant sensor effect?

 

[sideways danny]

tells the ecu when to go into cold start functions, richens fueling. If it's faulty if could be giving wrong info to the ecu

 

[EngineerD]

It hasnt always done it....

Maybe I should fix mine then :S Unplugging the cold start injector can help, underneath the inlet manifold, did it when I was diagnosing another problem.

 

[Paddy_g46]

tells the ecu when to go into cold start functions, richens fueling. If it's faulty if could be giving wrong info to the ecu

Any idea where it is located on a valver and how to check it?!

 

[EngineerD]

It is one of the plugs on the thermostat housing, next to the dizzy cap. *Think* its the brown plug.

 

[jonny_rs]

Mine does this aswell, bloody annoying! Hopping down the road aint a good look! lol

 

[andrewrobert87]

+1 mine does this too! well only recently, when i first start it, its jumpy as hell, give it like 200 yards and it seems fine untill i stop it and its cold ie - in the mornings lol

i thought it was just me but obvisolsy not lol another thing to add to my payday list!!

 

[jonny_rs]

yea same, its good to see others with same issue, although doesn't seem to be that much you can do about it which is bad!

 

[franx]

live with it. Mine does it too, when i feel it coming i press the clutch and let it rant .... And afterwards back in gear. All fine.

The RS is terrible on cold start; watch next time when it happens, when the temp. needle goes up all is good + well. It's a cold start limiter thingy built in by Reno

 

[Martin_172]

rofl at all the mk2 owners

lol reading fail on my behalf!!