106 gti cutting out on idle

[skunkeemunkee@orange.net]

hello everyone, hope someone can help or shed some light

basically my girlfriends got a phase 2 gti which has got an idle problem, it doesnt do it every time but when you stop, the revs will just become iratic generally trying to drop below idle but sometimes it'll try to rev its nuts off. i've not been involved in the problem much myself but its had a new fuel pump and idle control valve which did nothing. it had a new lambda sensor last week which seemed to cure it but its now started again.
the only time its been plugged into a diagnostics machine it came up with the lambda sensor but that was before it was changed

i'm thinking ecu but they're about £200 second hand which is quite alot "just in case"

any ideas?

[Olee]

welcome along mate

may possibly be a vaccum pipe, that may be why it wants to cut out. not completly sure why it would rev up high though........ possibly a sticky throttle cable ?

EDIT: gti`s are known for there dodgy idle`s! so it might just be having a french moment :)

[skunkeemunkee@orange.net]

thats something to check, it does have a foooking loud exhaust on it, not sure if the lack of back pressure would screw up a lambda sensor though?

its definately worse than just a slightly dodgy idle though, cuts right out and stalls so i get punched everytime i laugh at her lol

[chompy]

does it have standard cams?

[Olee]

bit of a bummer that ^^^^

does it have a decat on it? ? ?

[skunkeemunkee@orange.net]

as far as i'm aware its got standard cams and by the sound of it theres no cat there but havent looked at it. unfortunately she lives about 50 miles away so so get to have another look at it till saturday

[danridesbikes]

the only time its been plugged into a diagnostics machine it came up with the lambda sensor but that was before it was changed

i'm thinking ecu but they're about £200 second hand which is quite alot "just in case"

any ideas?

snap,

was not ecu

[skunkeemunkee@orange.net]

snap,

Quote:
Originally Posted by skunkeemunkee@orange.net http://www.106owners.co.uk/forums/images/cars/buttons/viewpost.gif (http://www.106owners.co.uk/forums/showthread.php?p=539539#post539539)
the only time its been plugged into a diagnostics machine it came up with the lambda sensor but that was before it was changed

i'm thinking ecu but they're about £200 second hand which is quite alot "just in case"

any ideas?

snap,

was not ecu



its still doing after the sensors been changed though?

[danridesbikes]

ive changed

throttle body and all sensors
map sensor
injectors
coil pack
coolant temp sensor
new lambda
new cat

changed the ecu

it still does it

[skunkeemunkee@orange.net]

bugger, does yours completely cut out then? what sort of mods have you got?

[danridesbikes]

standard,

idles at 500rpm if it will idle from cold with no throttle response, cuts out at junctions, revs drop when clutch pressed, if it cuts out at junction takes 5/6 turns of key to start sometimes

[skunkeemunkee@orange.net]

christ, that sounds a bit worse than my girlfriends. been doing a bit of searching on here and might clean out the throttle body see what that does. just havent had a spare 5 mins to look at it.

what are you going to try next?

[mitch@evolution]

ive got a similar problem, mines drive fine but is crap on fuel so ive a feeling that its overfueling as im only getting about 50 miles to a tenner city driving. Im about to change the thermostat and coolent temp sensor to see if its those and its making the car run with the choke on. I cleaned the ICV out and that seems ok. I have however filled the throttle body with Nitros 0-60 when running and filled the tank too which made it smoke like hell for a good 20 minutes of driving but seems to have helped the issue dramatically.

[chris106gti]

crank position sensor;)

[mitch@evolution]

crank position sensor is this a definate or a guess im it looks like no one actually knows the issues with these engines and guesses by changing every sensor.

[rich106quiksilver]

Get a diagnostic check done to see if anything comes up

[Henry]

Right im intrigued. . I . . used to have this problem... I changed everything except the ECU and injectors which i was avioding. . .the problem carried on... i also cleaned out the body etc etc. The diagnostics did however say . . nothing! Except the mixture levels were out. What i did learn is that only seemed to have this issue with less than half or maybe a quarter of a tank.

The problem has gone, if i keep my fuel topped up.

I figured it maybe something to do or connected around the fuel pump (which was replaced) ?? or last resort the ECU is dead? Which would maybe also explain why i lose revs for a second when i do a full turn roughly on the wheel?? And the wrong mixture levels. . .

I know this isnt much help but i figured it maybe used for reference and knowledge.

Good luck. ;-)

[danridesbikes]

if the ecu was dead the car wouldnt run

[Henry]

Humm its easy to say so... but what if it was merely faulty?

[106sc]

i had this cleaned all sensors, check stepper motor and now it starts 1st time every time jus idles very high lol

[Henry]

Yeah. At what roughly? I mentioned fuel earlier on in the thread.. Also dont seem to have the problem now ive been using premium fuel (usually v power) even though it shouldnt affect it ... Again just reference.

[106sc]

at about 3k rpm lol, i now seem to think its head gasket as i have water coming out of exhaust

[mitch@evolution]

my mechanic said mine was a head gasket as i had water coming out of the exhaust but its only when the car starts to want to cut out if i drive it all day the car is fine and the exhaust doesnt spit out water so it seems to just be a symptom caused by the original fault.

[Henry]

at about 3k rpm lol, i now seem to think its head gasket as i have water coming out of exhaust

Have you checked for other headgasket signs?? White deposits??

Its probably just condensation...

[gj_gti1986]

i have the same prob at the mo i turn the engine over an car revs like fuk instantly then at traffic it tries to cut out i have got cams so i no its lumpy but not this lumpy i have changed oxy senbsor an map sensor aswell and had diagnostics that came up with map sensor but its still the same it also went thru a phase of not starting until the fuel pressure was built up.

[Lee C]

Loads of us with same problems then.

[Jamie-106]

try a map sensor mate worked on mine

[Lee C]

Anyone local to me got the new style map sensor i can try?

[jnymris]

i'm in the same boat, anyone manahed to find anythink? i've not changed anythink yet. what would you all recommend? mine is a 1.1 ZEST 2 with a high millage, but still anyone got any ideas?

[mitch@evolution]

ive found from reading post after post no one can answer this and people just change sensors until its fixed which means they didnt know which one fixed it. French build quality i guess.

[jnymris]

well i'm not doing that to mine, i'll jst give it sum revs "in the school car park and 'be cool'"before i set off.

[mitch@evolution]

lee you manage to find one, been out for 6 hours driving today in the car and it got worse, seems pretty good on short runs and when physically running just doing like hot engine stop starts,

[Henry]

See mine was only when it was cold. Would be ok after about 5 minutes of driving. Whether or not it was because it had warmed up or the ECU had 'adapted' i don't know! Like i said, its ok now, lots of redex, and a usually full tank and it seems to be ok!

[aidy]

Anyone local to me got the new style map sensor i can try?


what years your engine kid? theres 3 map sensors, mine runs the mk2 variant.

now lots of people have had these issues, but i seem to recall albino jay had similar ones with the car running on 3 cylinders and intermitent misfires and stuff and it was solved by changing the water temp sensors. no idea how or why. will ask him about it if i remember

[jnymris]

See mine was only when it was cold. Would be ok after about 5 minutes of driving. Whether or not it was because it had warmed up or the ECU had 'adapted' i don't know! Like i said, its ok now, lots of redex, and a usually full tank and it seems to be ok!

mines excatly the same ! wish i knew wht the stupid thing was.

[mitch@evolution]

anyone got a pic of the MAP SENSOR and where is sits on the engine as it looks like this is the issue from alot of research.

[FENTON]

Give your ICV a realy realy gd clean or even better replace it.

[mitch@evolution]

cleaned icv and even changed it but it aint that fella.

[ryanpletinka]

mate mine does the exact same thing and on my girls vts. i reckon its the really big exhaust ive got could be loosing back pressure?????

[jnymris]

i don't have a "big" exhust on mine and it still does it so i doubt that could be it, but try swapping it and seeing?

[Jim_]

well i'm not doing that to mine, i'll jst give it sum revs "in the school car park and 'be cool'"before i set off.

Is it just idling irriaticaly or is it stalling? If its idling irraticly it could just be the air filter is blocked or clogged?

If it cuts then i would have set the injectors...but if they've already changed then its French...

Any of you had a compression test?