idle fast when cold

[NeX]

hi all, my little micra has a facelift 1.3 engine in it when it was originally a pre facelift LX

the car idles at about 1700rpm when cold.

anyone had this problem and know of a quick fix? the car is fine when it gets warm.

thanks ppl

 

[Napster]

Mate, mine warms up to 15000 from engine start and then sits around 400 after that when warm!!

 

[Swiper]

Mate, mine warms up to 15000 from engine start and then sits around 400 after that when warm!!

whats your rev limiter set at, 15000rpm, that's like a f1 engine lol. it should be around 750-850 when warm.

 

[Napster]

whoops, i meant 1400!! lol!!!
no it drops to around 500 mate. i can adjust the throttle cable though to up the idle

 

[maddave]

The idle should be a lot higher when cold. As long as it isn't idling like that when warm then thats ok.

does it have air con?

 

[NeX]

thanks guys,

its alot higher than my other car which runs at 1200.

the car doesn't have A/C but it does have powersteering, the MOT said it had a lambda reading which was right on the limit.

i put the engine so i don't trust it at all lol.

when its warm its about 500 which is fine...

 

[frank]

nex

on mine there,s a thermostat valve that turns a cam which holds the throttle open when cold, try adjusting that
and a black plastic screw on the other side to adjust the idle mixture

 

[NeX]

nex

on mine there,s a thermostat valve that turns a cam which holds the throttle open when cold, try adjusting that
and a black plastic screw on the other side to adjust the idle mixture

cool thanks mate

i think i know the bit you mean, but i am just wondering why it got like that in the first place, cos i am sure when i put the engine in it ran fine.

 

[frank]

nex

if you tap a multimeter into the middle lambda wire, you can set the idle mixture on that plastic screw (very short allen key needed)

 

[NeX]

nex

if you tap a multimeter into the middle lambda wire, you can set the idle mixture on that plastic screw (very short allen key needed)

ah cool i will give that a try,

what does the lambda actually read?

 

[frank]

nex

0 to 1 volts, .5 is what your aiming for but the stock narrowband lambda,s are very sensitive and they swing a fair bit
on gas i aim for .7/.8v foot down, .5 cruising and it drops right down on lift

 

[NeX]

nex

0 to 1 volts, .5 is what your aiming for but the stock narrowband lambda,s are very sensitive and they swing a fair bit
on gas i aim for .7/.8v foot down, .5 cruising and it drops right down on lift

ah i see that kind of info should be a sticky cos that is really useful thanks

 

[frank]

nex

yeh it would probably get a borderline emissions fail thro eh

 

[NeX]

nex

yeh it would probably get a borderline emissions fail thro eh

yea it did... its in for its MOT now....

 

[mike]

the temp sensor may be mashed, the lamba sensor may also be mashed as well

 

[NeX]

hhmmmm true but this engine is from a facelift with only 40k on the clock it should still be ok