LET not idling?

[let_nova]

started the LET up the nite and it wont idle with the AFM plugged in. only with it unplugged. so i thought it would be th AFM but i tried it in another LET and it seems to be fine?:wtf: changed the ICV but its still the same?

any help app.:thumb:

[meritlover]

is the AFM in the right way round?

[Paul]

sounds like some sort of air leak to me,

although I have noticed a few AFM's the wrong way round before, as they electrical plug is on the other side to the XE AFM's so that can throw people, although they do have an arrow on the top of them.

[let_nova]

the AFM has the arrow pointing towards the turbo which i pressume is the right way.

[Paul]

it is indeed what vacuum is it holding?

[let_nova]

holding vacuum?

[Paul]

Yeh assuming you have a boost gauge is should be about -15 or so on idle, if you have an air leak it may not idle and the guage will read 0 or maybe -1/2. Sounds like an air leak to me.

[let_nova]

why will it idle fine with the AFM unplugged? any ideas?

[meritlover]

because the AFM might be reading rubbish flow values but because the voltage isnt low/high there isnt a code genereated so the ECU assumes the value of flow is correct and therefor adjusts the fueling to suit.

unplugging the AFM will generate a fault and a default value to be substituted for the 'live value' this will be closer to the nonesense the AFM was reading, so it runs better. although its not right......

[meritlover]

however the fact that youve tried it on another let would suggest what id written is true, but not applicable in this case

[let_nova]

im confuggled!!!

[Rich]

The afm will be telling the ECU its getting x amount of air into the engine.

If there is an air leak after the afm, it will be getting more air than the ECU thinks, meaning it will not be putting enough/too much fuel in causing bad idle or cutting out.

When the afm is unplugged the ECU sees there is a fault, so it uses a default reading which may be better for the amount of air the engines actually getting

Easier to understand?

Does it run if you hold the throttle open?

[meritlover]

it does sound like its running lean. could be due to low fuel pressure (ie bad reg or wrong pump)
as if the AFM is disconnected, the ECU will automatically dump loads more fuel down to keep it safe.

are your boost hoses connected properly? including to/from the boost controller?

[let_nova]

it does run when you hald the throttle open. it blew a intercooler hose tonight the 1 that goes onto the bottom of the turbo so i maybe think that this is where the air leak has bee causing the cuttuin out? thanks very much for all info and will post my results when the pipe is fixed. rep both ways.

[let_nova]

well tightened all the intercooler hoses again so hopefully no air leaks.

i wired a new plug onto the temp switch but as there wasnt a plug on it before wasnt sure if i wired it correct?

http://i244.photobucket.com/albums/gg34/incanova/car.jpg

also is running with no airfilter just now just from the air filter would this cause poor idling?

[let_nova]

anyone?

[meritlover]

please solder or at least crimp your connections, strip-and-twist just wont do :(

[let_nova]

please solder or at least crimp your connections, strip-and-twist just wont do :(

they will be getting soldred this is just a pic to ask.

so anybody??

today i held the revs on the throttlebody with the afm unplugged then as i held the revs i plugged the afm back in then it idled but it would only also idle when it was warm?:tard:

[Paul]

today i held the revs on the throttlebody with the afm unplugged then as i held the revs i plugged the afm back in then it idled but it would only also idle when it was warm?:tard:

What? :tard:

[let_nova]

what?

[Paul]

what does that say? cant make head nor tails of it.

[let_nova]

right the car only seems to idle when the air flow meter is unplugged. as when you plug it in it dies. so i started the engine with the air flow meter unplugged i then gave it some revs using my finger on the throttlebody as i held the revs i plugged in the air flow meter let go of the revs and it idled. but when i turned it off and started it again it wouldnt run?


that better?

[Adam]

Got another afm try?

[let_nova]

i took my afm to a lad up the road to try in his and it seemed to run ok. he was a bit funny of trying his in mine incase it funked it.

[Paul]

i still reckon it has an air leak though, have you checked all the vacuum/boost pipes, even the little ones which contol the fpr etc?

As said before by MeritLover, if the afm is dodgy then when un plugged it will run better than when being plugged in, but as youve tested it on another LET and it ran fine, then its not the AFM, so youre barking up the wrong tree.

[let_nova]

i still reckon it has an air leak though, have you checked all the vacuum/boost pipes, even the little ones which contol the fpr etc?

As said before by MeritLover, if the afm is dodgy then when un plugged it will run better than when being plugged in, but as youve tested it on another LET and it ran fine, then its not the AFM, so youre barking up the wrong tree.

yeah ive checked all boost pipes etc again and again but no leaks.:mad:

[Paul]

so on idle its holding what vacuum on the gauge?

[let_nova]

-9

[Paul]

hmm, bit low but should be ok, ideally you want to get a mate with a LET and swap bits over til it works, thats the easiest way.

[let_nova]

yeah i know but as theres only 2 lets around here. and the other guy is a bit protective over his car!!

thanks for help and patience,

[Paul]

hmm, dont what else to suggeust really, wiothout being there and having a play myself, its hard to say. probably wouldnt be able tio fit it anyway Lol

[let_nova]

probably wouldnt be able tio fit it anyway Lol

??:wtf:

[Paul]

sorry on my phone lol.

I probably wouldnt be able to fix it anyway Lol

[let_nova]

now that dedication for ya!!! using the phone for png!!!

[Paul]

Lol good luck with mate, im pretty stuck but maybe someone will be able to help some more.

[Rich]

well tightened all the intercooler hoses again so hopefully no air leaks.

i wired a new plug onto the temp switch but as there wasnt a plug on it before wasnt sure if i wired it correct?

(cut pic)

also is running with no airfilter just now just from the air filter would this cause poor idling?

Sorry if ive read this wrong, but have you been running it with no temp sensor connected?

Have you got an eml light wired up, try flashing the codes up and let us know what you get.

[Rick Draper]

You cannot wire the CTS in wrong. However running without it connected will not have been helping you with your problems.

[let_nova]

well after another day of trying to get the sh1t heap to idle all is not good.
changed the ICV again no difference. also changed the TCS no difference.
the car will idle very lumpy when it warms up and when you drive it it seems to get to about 3500 revs and looses power it still pulls but not loke it should.
also noticed when its boosting the volt guage drops and the lights dim?????

[let_nova]

also the ecu is chipped eds phase 2. and has a different actuator. also its running a intank pump.

[16v Nova Kev]

plugs/ leads/cold start switch funk knows mate

[let_nova]

been on mig ther

map sensor---or amal valve???????

or wrong plugs?

anybody know the code for let plugs???

[let_nova]

plugs/ leads/cold start switch funk knows mate

anyway get that car done!!

[alan b]

i had same problem and it was an air leak from a boost pipe.

[let_nova]

hmm i will check them again!!

[let_nova]

right today i tried again but still no joy. im sure theres no air leak.

if i unplug the airflow meter it dies but if i unplug it and squeeze the icv pipe so no air can pass through it idles near perfect??

[let_nova]

problem solved!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[Rich]

Be nice to post up what fixed it for anyone thats looking at similar problems in the future??

[let_nova]

i was going to but nature called.

well after trying my AFM in another car it was fine seemed to be no problems with mine. but after many days of head scratching and getting ready to advertise the whole car i gave it another go and tried my pals AFM in my car (didnt do this before as didnt want to damage any of his bits) and it fired up and idled all on its tod!!

[Adam]

;)

[16v Nova Kev]

well done son. pitty i had 500 quid with your name on it lol

[let_nova]

well chuffed!!! had it ticking over and the 2 niebours came out and complined as there windows and doors were vibrating!!!! 500 quid still worth the 800 i paid for it even not running right!!! lol

[16v Nova Kev]

i was talking about the whole car ha :thumb: :p

[let_nova]

once its running maybe for sale.... ......



























not. after the time ive put into it i want some use of it!!!

[16v Nova Kev]

good dont sell it till i get a chance to overtake you a few times up the track:p :p

[let_nova]

overtake.... meh you aint got no chance the only time you will see me in your mirror is when im coming up behind you lapping you.......