Hi chaps.

What causes a car to run "lumpy?" in the mornings? I think all of my RST's have done it, even my new one does with a low mile engine in, it will do it for 5 or 10 secs as if it runs on 3 but then is fine.

What causes RST's to do this?

Cheers

 

injectors,i fitted a new set and it doesn't do it now,best Ł96 i spent on it.

 

Ahh, well I suppose takin these out and giving em a cleanup could help? I thought that is could be a faulty cold start, could this be the case also?

 

mine does it a little bit, 5 secs, its had all new sensors, but the injectors i know are 120K miles old,


i think i have all my old sensor, if you put a pic up so i know which one it is, you can have it , i will post it, just pm me your address,i just changed all the sensors anyway when i got the car, as i knew i was going to have it for ever.

 

Well my car has only done 50k so maybe the injectors just need cleaning out, if that can be done?

 

mine runs like a bag of shit for first 40secs-a minute, then clears and revs up an down no probs.........weird!

 

injectors can be cleaned but better off with a new set.

 

Might just do that then, well the car is getting a good service this week so will see how it is after that. Will check the cold start is actually plugged in and then see about the injectors but for now I am not too worried because it only happens when it is left overnight.

 

thank fcuk it aint just me that gets this problem, it's got a bit better after disconnecting the cold start but still could be better.. so peeps reckon it's the injectors

 

I get the exact same problem but i thought it was dodgy plugs or somethin but i'll maybe get some injectors now

 

no quite the same but mine never started very well when cold, disconcted the cold strt injector starts fist turn now, think these go wrong and over fuel the car when cold, which will make it run cr*p, to be honest im sure its not needed unless its about -20

 

Can anyone confirm the above?

 

I'm gonna asume your S2 is MFI, in which case, they run lumpy at cold start. Always do.

Basicly is the fuel not vapourising enough in the cold air to burn effectivly.

The revs will be higher anyway at cold start, usually about 1300rpm. But my old one used to bottom out and twitch like a mo fo.

EFI ones shouldn't at all.

The only reason I ever disconnected my cold start injector was because it used to flood the engine all the time.

So chuck in some injector cleaner and see what happens. If not take it to your local tunup shak and get you injectors cleaned and the flow rates checked. You shouldn't have to replace injectors, they usually just need a clean.

 

Hi mate

Yea it is MFI. OK, well looks like I gotta go EFI I will do eventually, need chat

Not too worried for now as it doesn't do it as bad as my last S2!

Cheers for all your replies

Ad.

 

i've had this problems for feckin ages and it does my head in, also for the first few minutes it idles at about 300rpm, and if you rev it it will drop rite off and stall sometimes,


been told it could be the air flow meter? sound right?

think i may change the injectors as well then

also whats this cold start valve thing?

cheers

cawood

 

lol, mine is nothing like that, it dont stall or rev irratically, just for 30 secs or so it runs crap. I think the cold start is for extreme temps for starting the car, ppl say it is not needed and can flood ur car by putting excess petrol through

 

where is it? whats it look like and what do i do? just unplug it?

cheers

 

it's under your inlet manifold,blue plug.

 

tbh I don't know myself, I think it is a plug around the back of the engine but not sure

 

oh yeah seen that before, what'd i do? just unplug it n see how it runs?

 

yea unplug it... its a the blue plug underneath the inlet manifold, then try starting your car after its been sitting overnight and see how it reacts (i.e any better idleing)

 

nice one bruv,

 

Will try that too.