04 polo bunny hopping !

[c l a r e]

Hi everyone

Just new to this fourm and I'm needin sum advice on my polo which is playin up. It keeps bunny hoppin & has got much worse 2 nite. It does it in every gear and at various speeds. Ther r no engine management lites on either.

Does any1 hav any suggestions as to whats wrong with it ? :confused:

cheers

Clare

[SKODAOCT20vt]

May be a simple fault with the ignition system - e.g. faulty HT lead, spark plug or dist cap??? I would check these first as it may cost a lot to have the fuel injection system checked over - which is what I would do next!

[c l a r e]

hey thanx 4 the suggestions :D maybe shud hav posted tho that I got it fixed :o needed a lambda sensor or sumthin like that. Thanx again !

[c l a r e]

:zx11:
Its been in the garage again 3 days after I posted sayin it was fixed ! They then said it was the throttle body so they ordered the part, changed it and it is still doin it. I'm about to give up as the garage has admitted they don't have a clue whats wrong with it

[Gaston]

Ive got similar problem with Golf Mk3 1.6 Petrol. Does your polo stall sometimes when you are approaching roundabouts and you press clutch in. Do you find its more of a problem after the car has warmed up? and in low gears.

I had diagnostic check done by VW specialist and they picked up that the Hall Sensor on the distributor was faulty. I replaced distributor but made no difference whatsover. I have also replaced all HT leads, spark plugs and filter again no difference. Also used fuel additive which cleans fuel system but no difference again. These are all fairly cheap do do and worth a try. Reading other threads one of the most common fixes for this problem seems to be to clean the throttle body but as youve replaced it it obviously cant be that.

Somebody at work mentioned that it could be air leak downstream of the throttle body such as leaky inlet manifold gasket or gasket under throttle body.

If you get any where let us know how you sorted out.

[c l a r e]

luckily enough mine is still under warranty so this hasn't cost me anything except my time & energy. I acutally got it back last week & its been fine so far (fingers x'd). They said it was something to do with the wiring near a sensor :confused: which one though I couldn't say.

from what you have said thats exactly what mine was doing at the time but after changing the cat and a few other things it was starting to do it when pressing the accelerator so I took it straight back. Re the temp thing though it was really intermittent and at one point it even did it after I put petrol in it. Actually thought I had put diesel in it lol

Anyway good luck with yours and let me know how u get on :D

[adamss24]

Hi to all, first i think anyone who owns a Vag car should invest in a OBD2 diagnostic interface and download Vag-com from the internet...it would pay from the first visit you should pay the dealer...Usually after a malfunction you should be able to scan the car for faults/trouble codes. Vag-com gives a educated guess/answer as to where the fault lies. Usually with a bit a know how and help from fellow members you could save yourself a lot of money...! Since 1980 when MB and VW introduced electronic sensors nearly all german cars became more unreliable! Petrol cars suffer from :Lambda(oxigen)sensors, faulty HT leads, dirty filters, MAF meters and throttle bodies, diesels from: dirty injectors, MAF meters, air/fuel filters, injection pumps, faulty relays and so on...Do not rely in dealers or independent garages to fix your car... because i have seen clueless audi techs and many back yard mechanics trowing new parts at a car in an atempt to fix a car. Get a good workshop manual and a good set of spaners and give it a go ! You will love getting to know your car plus it will save you a big wad of cash in labour costs.

[Gaston]

Adams24, Clare thanks , Sounds like the interface a good idea, is this something you can plug between a laptop and the diagnostic port in car. Where can you get them from?

[adamss24]

From Ebay, you should pick one for about 50-70 pounds and should work ok with cars up to 2001-2003. If you really want the best try www.rosstech.com for their hex can usb interface that worksd with all curent vag cars and cost about 300 dollars but you get full support and future upgrades. It pays for it as you could do a lot to your car like activate cruise control, key matching , imobiliser and ECU matching, disabling the EGR , calibrating the throttle body on petrol cars, tdi timing...check the web.

[david b]

Exactly same , runs perfect for 40-50 miles then cuts out on sunday took 2 hours to go 2 miles , cuts out then starts again after 5 mins.
In garage now code reader says hall sender no signal, they are replacing distributor today, they say this will cure it! will keep you posted.

[Gaston]

Finally cracked problem with stalling and problems with idle. Main problem was the idle control valve which was causing it to stall when you lift foot off gas. £80 from GSF and very easy to fit yourself. There were also a few other problems the Lambda sensor was faulty and had been disconnected. When tried reconnecting it made it impossible for engine to idle correctly. £50 from lambda power basically this was causing the engine to run very rich. Also I replaced coolant sensor which is around £10 and found that the temp gauge now reading at 110 centigrade rather than the 100 it was doing before. As this also feeds into engine management system suspect that it has an effect on fuel air mixture. Car now running beautifully, lots of power and starts really easily. You can see if its the idle switch thats a problem by adjusting throttle at throttle body so that it never depresses the idle switch. If you find the car runs better and doesnt stall then you know its the idle switch. I also had a fault code come up during diagnostic which hinted at idle control not working correctly. This has taken many months for me to resolve and affects many people. Need a dedicated thread or resource to help people diagnose these sort of problems because you can throw loads of money at parts hoping to resolve the problem and not getting any where.