Stooopid car :(

Wingy16V · Post by **Wingy16V** » Tue May 02, 2006 6:09 pm

Hello all, basically i have a 98' mk4 1.4 16v polo with a AFH engine code.

I brought it with a lil problem with the idle, under braking the car would want to stall unless i dip the clutch quick enough.

I took the car in for a cambelt change which was done no problem but upon starting the car it wouldnt have it. Once started it was running lumpy as hell! The throttle body was cleaned and everything was checked and double checked and all seems to be in order.......

Hooked the car onto a diagnostic tester and the throttle body positioning sensor was failing and another code i cant remember now.

I changed the temp sensor as I've read up that these fail and my old one was giving wierd readings anyway which the new one has sorted.

I also got a brand new throttle body which hasnt solved the problem!!!

Ive got Mag leads in there and when i touch the number 2 lead i got a lil shock, is that meant to happen?

My baby is STILL running rough and i dont know what it can be? Any ideas anyone? Someone please help me solve this.....

polo boi · Post by **polo boi** » Tue May 02, 2006 7:15 pm

ur plug lead is split man, thats why u aint idling right, buy new leads an u will be fresh, if u get a shock that means that ur earthing the spark which shudnt happen if u touch it, i touched a split lead once witha spanner in my hand at work an JESUS my arm flew away back, ''spanners conduct well'' lol, just get new leads man, seems like uve spent alot cash on summit u didnt need but at least u have new parts

polo power · Post by **polo power** » Tue May 02, 2006 9:42 pm

hi there, have you checked for resistance in the ht leads, it could also be an air mass meter?

polo boi · Post by **polo boi** » Tue May 02, 2006 10:54 pm

polo power''
hi there, have you checked for resistance in the ht leads, it could also be an air mass meter?''

i wudnt of thought if wud b that man, it just sounds like a basic split in his lead, as hes gettin shocked wen he touches it,

just look at the lead wen ur car is turned off an look for splits in it, i guarentee if u buy new ones, ur problem will be solved

Wingy16V · Post by **Wingy16V** » Sun May 07, 2006 11:10 am

Hello all, thnx for the replys!

Where is the air mass sensor?

Ive changed the uprated HT leads for standards ones and still the same problem.

I think it is the lamda sensor because the garage cleaned the old one and it made it worse. Ordered a new one so hopefully see some promising results on Mon!!!

Karwing

Wingy16V · Post by **Wingy16V** » Thu May 11, 2006 9:43 am

I got the new lambda sensor and STILL no change!!

I dont think it has an air mass sensor because its normally visable and connected to the air box hosing right? I dont have one there well at least i cant see it.....

What can be the problem?:( Got new throttle body, new temp sensor and tried new lambda sensor to no avail!

It had a service not long ago with new sparks, the lot.

Even the garage is baffled!! HELP someone......

warrmr · Post by **warrmr** » Thu May 11, 2006 12:39 pm

may be a silly suggestion but find some one with VAG.com and get them to hook up to the diagnostic port and read off the fault codes to you will cost no more than Â£30 to have the fault codes read and reset

if you cant get them read then just reset the ECU leace the negative battery unplugged overnight then the ECU will relearn everything over the next 500 miles and it may have solved your problem

as if the ECU is still reading a problem with the idle controll valve then you will still have the problem as the ecu is sending the wrong settings to compensate it. ( you have a electronic throttle ( you can tell as when you look at the throttle butterfly it is closed then you start teh engine and it will move by itself to part open (idle speed) but the accellerator cable wont move hence you get slack in the accellerator peddle (about 2mm) i noticed that as i lernt to drive in a diff car and it still annoys me) )

so a list of things you have changed from what i see in the thread
Lambda probe (o2 sensor)
Throttle body (idle control valve and air temp sender)

check the blue temp sender that may be your problem ( i havent got a clue what it is but that causes and unstable idle aswell.

other than that i havent got a clue mate.

polo boi · Post by **polo boi** » Thu May 11, 2006 10:08 pm

warrmr, u seem 2 know wot ur chattin about, with the ECU's, does ur ECU control ur petrol sensor? coz i dont know if im burnin 2 much petrol up, i have a 1L an its sortve sore on petrol, i do drive a fair bit, but i think i shud b gettin more miles mabye, if i left the ECU unplugged all night wud it solve the problem?? an any otha problems that the car may have?

Wingy16V · Post by **Wingy16V** » Fri May 12, 2006 9:36 am

I changed the blue temp sensor already.

The car has been on the diagnostic tester twice. The first time came up with faults but the second time none..... but still running rough?

What is wrong with it?

LeMeph · Post by **LeMeph** » Fri May 12, 2006 12:41 pm

try taking it to a specialist maybe

i have absoluetly no idea what to suggest. It probably is somthign really really stupid, thats what these things tend to be in my limited experience. Not like a blown piston ring or somthign? My peugeot idlled horribly and we believed that to be a piston ring. Though fi your gettign electric shocks then gawd knows! What bit of the cabel were you touching to get the shock? did you still recieve the shock when you changed the cables over? Because if you did that would mean the shock isnt comign form the cable but form somewhere else. That would theoretically mean youve got an earth or a live hanging lose somwhere (maybe??). I dunno im just theorising im no mechanic and no electricanso dont quote me on anything!

Chris,