Help please!! idle/reving problem

[rt_blackpool]

i've got an odd idle problem, and it doesnt really fall into any off them listed in the guides section.

basically, you start it and it will either rev to 2k and then die, or it will start and the idle will bounce from 700 to 2000 and die or it will idle at around 1400.
if it doesnt die from 1st starting, and you rev it the constant revs sound terrible, say if i hold it at about 3k or 4k it just sits there reving and poping.

it really does sound terrible and it's only just driveable, and as you've prob guessed i've not set off for FCS yet, and at this rate i wont be at all :(
odd thing its just come back from its MOT and how it passed like this i'll never know!

[VIPERONE]

lambda

[BRUN]

id say lambda aswell

[rt_blackpool]

that was my 1st thought, but if it was the lambda wouldnt the problem kind of go away once it was hot enough?

[BRUN]

usually yes, however they dont last forever, getting 80k from one is considered good, they always need replacing at some point

[Amirclio]

I took mine out, cleaned it and blasted the airline through it. much better idle now its re-fitted!

[rt_blackpool]

yep, gonna be taking the lambda off sometime this week and checking it.

was yours not even broken amir?

[rt_blackpool]

just to give a bit of an update on this....

had the car in the air tonight and tried to remove the lambda, however its pretty well stuck in there and i might just pay someone/somehwere to remove it and put the new one on for me.

howvere while i was under there i noticed that the wire that goes from the top of the sensor goes into a plug, so i disconected the plug and started up the engine to see if it still did it, and it does. exactly the same problem.

so, does that mean that the lambda is fudged if it does the exact same thing disconected?

[BRUN]

id say probably as it means the lambda isnt doing anything at all

[VIPERONE]

LOL I'D HAVE TO AGREE

[rt_blackpool]

i actually now think it maybe a fuel filter problem.
basically when i got it back from its MOT it was empty of fuel, so i 1/2 filled the tank with optimax and stuck 1/2 a bottle of forté in and it came better.

however, it idles better, but not perfect and when i try and drive it, it stalls its self unless im giving it more than required revs to pull away.

because the tank was empty, i think its sucked all the cr@p out of the tank and into the filter, which is now blocked and not letting enough fuel through.

thoughts?

[BRUN]

buy a new filter, there cheap and even i can change one

[rt_blackpool]

lol yeah, should be easy enough, however..... :roll:

me and a mate went to do it about 1/2 hour ago and the head of the torx screw has been rounded off.

honestly, i'd sware this car is cursed and i think as soon as i get the engine problem sorted im gonna be selling it and buying a better condition one.

[VIPERONE]

however, it idles better, but not perfect and when i try and drive it, it stalls its self unless im giving it more than required revs to pull away.


thoughts?

ISCV ?

[rt_blackpool]

however, it idles better, but not perfect and when i try and drive it, it stalls its self unless im giving it more than required revs to pull away.


thoughts?

ISCV ?


i've had this off and cleaned it with carb cleaner, however i noticed the valve is a bit stiff, so i got it out again and gave it some WD40, which seemed to help the valve.

i'm pretty sure its not the ISCV because it has problems when its not idling, for example, if i rev it up to say 3k it sits there struggling and popping or if i try and drive it, it stalls itself.

[rt_blackpool]

ok really really important update now......

i had the spark plugs out just now, and they were really really sooted (sp?) up. really black and caked up. this i believe is due to the fact its running too rich?

anyway, me and me dad cleaned them up, put them back in and started it up. and it was instantly 1000% better - idle was perfect (a little bit high at about 1500/1600k but otherwise ok), reved all the way through the range without missfiring or anything stupid. so i took it for a spin and it was perfect, never really got it out of 2nd going round the block but yeah, it was great!


so now to sort the problem of the over fueling. what could be causing this and what can i check?


also, on another note, how hot is the exhaust manifold ment to get?
like i said, it was like 2 mins round the block but when we got back it 4 pipes were really hot (you could hear them expanding and contracting). is this normall?

[BRUN]

over fuelling might be a really dirty air filter but your ITG should now be with you mate so it shouldnt be that

is it chipped ?

how old are those plugs ?

it still might be a bad lambda aswell you know mate, that does affect the fuelling but so do other sensors, a common failure is the coolant temp sensor, this affects the fuelling

[rt_blackpool]

yeah the ITG is on there now thanks :)

its not been chipped as far as i know, but i couldnt say 100%

plugs and leads are prob as old as the car to be honest.
would getting new leads and plugs help?

i take it if it was the lambda, the ecu would think there's too much oxygen being detected by the lambda, and the tell the ECU to put more fuel in?
is it possible to adjust the fuel/air mixture manually?

also, where is the coolant temp sensor?

[Purple]

plugs and leads are prob as old as the car to be honest. would getting new leads and plugs help?
I would guess you have not been getting enough spark across the gaps with the old cables. Run the new plugs and cables for a few weeks and visual check the plugs again. Might be as simple as that.

[BRUN]

plugs as old as they car ?

i hope your not serious mate lol

get them changed if they have been in there longer than 6k

NGK - BKR6EK

if you think your leads might be buggered aswell get those changed

[BRUN]

is this fixed now mate ?

[rt_blackpool]

nope :(

sorry i haven’t updated for a while. money is a bit tight at the min so haven’t had chance to do much. i've replaced the dizzy cap and the plugs but that’s not made any difference ( i didn’t think it would). ive still got the leads to do but im pretty sure its not them either.

we've tried a few other things here (earths and stuff) but at the end of the day im sure its the lambda. its either that or the fuel filter, it must be one of them but its over fuelling so it's prob not the filter.

if i could get it out and replace it i would, but its really stuck in there so im gonna have to get someone to do it for me. failing that i'll replace the filter as well.

failing all that i want to take it to a reno specialist and plug it into the comps and see what they say. i’ve started another thread regarding this.

honestly as soon as I know what's been causing me so much agro, im gonna post it in here!

[BRUN]

might be easier to get a replacement downpipe mate if its stuck in, thats what i did

[VIPERONE]

use the correct high quality spanner.. thenlie on your back and use your foot to power the spanner round.. it should.. "crack off"

[arj256]

A replacement Universal Lamba is £35 from Gsf, some dont recomend them but i didnt have any troubles with mine.
Could be worth a shot.
And if your having dificulties getting the old lamba out let the exhaust get nice and hot and then try.