DanH Posted December 31, 2006 Report Share Posted December 31, 2006 (edited) Hi all,Having a nightmare at the mo that I hope someone can advise me on?I was having major idle problems not so long ago and overheating probs. Back then we took the water pump out and swapped that as well as the Fan switch and thermostat. That sorted the overheating problem, at the same time we took the throttle valve control unit off and the manifold, gave them all a clean out and put it all back together again.That sorted the idle and stuttering loss of power and then sudden onset of power problem.Its back now though!!! I called VW and asked them how much a new unit would be and they came back with near on £300The car is seriously messed up..i will be driving along and it will lose power stutter and then burst back into life again. As said it has had new thermo, fan switch, plugs and I had cleaned all of the throttle body etc out not so long ago.Im thinking replace the whole unit? Can anyone recommend a good breakers or parts place? Thanks. Edited December 31, 2006 by DanH Quote Link to comment Share on other sites More sharing options...
db Posted December 31, 2006 Report Share Posted December 31, 2006 Before you run to that huge sum of money have a look at your HT leads, it's a very common problem for them to fail and cause stuttering and loss of power. It's definitely worth a try. Quote Link to comment Share on other sites More sharing options...
DanH Posted December 31, 2006 Author Report Share Posted December 31, 2006 (edited) Thanks db!! Edited December 31, 2006 by DanH Quote Link to comment Share on other sites More sharing options...
s3boy Posted December 31, 2006 Report Share Posted December 31, 2006 how can you tell if your ht leads are gone? Quote Link to comment Share on other sites More sharing options...
db Posted December 31, 2006 Report Share Posted December 31, 2006 You'll get a missfire, which will cause a loss in power, stuttering, dodgy idling and on mine it even threw up the engine check light. Usually one of the leads is just shorting, but it's best to replace them all. You'll also find it's a lot worse when it's damp. Quote Link to comment Share on other sites More sharing options...
DanH Posted January 1, 2007 Author Report Share Posted January 1, 2007 (edited) Yeah I had noticed that this tends to happen after rain etc..like yesterday driving through floods on the bloody A35!! Poor little lupo is covered in crap! Edited January 1, 2007 by DanH Quote Link to comment Share on other sites More sharing options...
The subtle modder Posted January 1, 2007 Report Share Posted January 1, 2007 Right mine has this sudden loss of power and then all the power comes back on at once BUT i dont think its leads or plugs as it only happens from cold when going up the bank from my house like every morning etc But i can get rid of it by changing up gear and it keeps going style="vertical-align:middle" emoid=":confused:" border="0" alt="confused.gif" /> which makes it definately electrical in my mind?What can it be?wayne Quote Link to comment Share on other sites More sharing options...
DanH Posted January 1, 2007 Author Report Share Posted January 1, 2007 See this is what happens to mine and when it overheated and blew up due to blown water pump the RAC blokee came along and plugged in his own RAC diagnostic machine. And that came up with throttle position sensor. Which i later found out as actually being insie the throttle valve control unit. And these are about £300 main dealer part only!! Quote Link to comment Share on other sites More sharing options...
IDGM Posted January 2, 2007 Report Share Posted January 2, 2007 My 1.4S has got a cough and splutter situation under acceleration that has really only developed since it was serviced. HT leads weren't replaced then so I'll see if a change improves things. Quote Link to comment Share on other sites More sharing options...
DanH Posted January 24, 2007 Author Report Share Posted January 24, 2007 (edited) Sorry to drag this up again folks but...I swapped the HT leads today and it is STILL spluttering, oddly it only seems to do this while revving at certain revs..say 2500rpm. Ill be driving along and i will just hesitate and splutter, it sounds like a definate misfire. While its doing this if i pull up to stop the idle is all over the place. This is really driving me mad now as I really dont know what this could be... anyone got any ideas? im still thinking throttle position sensor? Edited January 24, 2007 by DanH Quote Link to comment Share on other sites More sharing options...
L119 UPO Posted January 24, 2007 Report Share Posted January 24, 2007 (edited) Surely you mean the ICV (idle control valve) ?Theres no way that will cost £300, more like £60.Misfires are normally due to bad ignition.If you have changed your plugs/leads, and your battery is pumping out good voltage you should try fitting a new coilpack.A coilpack should cost ruffly £60But it could also be some dodgy wiring somewhere, or an ECU mapping problem. Could be a whole host of things, but id try ignition stuff first because it's more likely. Edited January 24, 2007 by LoopGTI Quote Link to comment Share on other sites More sharing options...
tshirt2k Posted January 24, 2007 Report Share Posted January 24, 2007 Dont keep guessing, get a diagnostics scan to find the problem. Vag Com or similar. Quote Link to comment Share on other sites More sharing options...
L119 UPO Posted January 24, 2007 Report Share Posted January 24, 2007 Dont keep guessing, get a diagnostics scan to find the problem. Vag Com or similar.Wont always find a fault, and it wont narrow down your search for an ignition issue.It wont tell you if your ICV is nackered, your Battery is nackered, your plugs are nackered, your leads are nackered etc.Pretty sure a diagnostics is only any good for broken sensors/ECU stuff. Quote Link to comment Share on other sites More sharing options...
tshirt2k Posted January 24, 2007 Report Share Posted January 24, 2007 Have you Got Vag com?? If not then you should keep comments to yourself! It can tell you anything you want if you know how to use it. I have it and it can tell me which Ht lead has gone ie Cylinder 1 misfire. You can keep swapping parts all day long and still not get anywhere. You cant guess with modern vehicles cos anything can cause these probs even a coolant sensor. Quote Link to comment Share on other sites More sharing options...
Teflon Posted January 25, 2007 Report Share Posted January 25, 2007 (edited) dont discount the fact it may be the coilpack playing up too! Edited January 25, 2007 by Teflon Quote Link to comment Share on other sites More sharing options...
DanH Posted January 25, 2007 Author Report Share Posted January 25, 2007 (edited) Easy guys!! There are benefits for and against VAG com, i take all points on board. Problem I have is that he RAC put their own kind of scanning software on it and it came back with throttle position sensor, which is in the throttle valve conrol unit which is £300 from VW main dealer. I didnt think the 1.4 16v had an Idle control valve? Im taking it to a VAG specialist on Friday so watch this space hopefully he can tell me whats wrong. Am i right in thinking that the 1,4 16v AHW doesnt have a dizzy? Hes pretty good this guy so i will report back what he finds. He does REVO as well lol... REVO the Lupe? lmao!!!but so far changed the leads, plugs, battery is good, but still misses and jumps like a bloody kangaroo!! Worse today than ever before.!! Edited January 25, 2007 by DanH Quote Link to comment Share on other sites More sharing options...
L119 UPO Posted January 25, 2007 Report Share Posted January 25, 2007 (edited) Hope you get it sorted and it doesnt cost you too much.ICV is on the throttle body, it's a simple mechanical air flow switch which keeps the revs going on tickover.These can get clogged with oily residue making them stick, so your car will stall if you dont keep your foot on the gas.BTW these don't cause misfires, so it doesnt sound asif this is the culpret. You have an ignition problem. Edited January 25, 2007 by LoopGTI Quote Link to comment Share on other sites More sharing options...
DanH Posted February 15, 2007 Author Report Share Posted February 15, 2007 (edited) Hi all,Yet again im sorry for bringing this up but.....Put the new throttle valve control unit on today, before it went on VAG com was coming up with Lambda probe blown and Throttle position actuator blown. Now we put the new one on and it seemed ok to start of with but after driving it up the road it is EXACTLY the same if not worse. Does anyone know what this is likely to be as i am fast running out of ideas. When the car left the garage it had no fault codes at all but the lambda is faulty, I can see where the exhaust gases are blowing through the middle of the lambda. So i still have the massive problem after blowing £100 on new throttle unit. Its weird, if i rev the engine from the wire it gets to about 2500rpm then loses power stutters and wants to stall but catches itself. Then it will rev really high and eventually drop back down.Could a faulty lambda cause this? If its reading incorrect o2 then will the ecu go against this by over fuelling and breathing heavy, then if its breathing heavy that would mess up the idle? Im going for the lambda next on my list....But if you rev the engine at the throttle cable end the spring on the throtle valve feels like its slipping but only when the revs drop!!Im totally confused and fed up with this problem, plus the car is going through SOO much fuel..i got 140 miles out of a tank yesterday!!! If anyone could help i will reward them with beer... or donate an organ or something cos im at my wits end :-( Edited February 15, 2007 by DanH Quote Link to comment Share on other sites More sharing options...
jamiea7x Posted February 18, 2007 Report Share Posted February 18, 2007 Hi all,Yet again im sorry for bringing this up but.....Put the new throttle valve control unit on today, before it went on VAG com was coming up with Lambda probe blown and Throttle position actuator blown. Now we put the new one on and it seemed ok to start of with but after driving it up the road it is EXACTLY the same if not worse. Does anyone know what this is likely to be as i am fast running out of ideas. When the car left the garage it had no fault codes at all but the lambda is faulty, I can see where the exhaust gases are blowing through the middle of the lambda. So i still have the massive problem after blowing £100 on new throttle unit. Its weird, if i rev the engine from the wire it gets to about 2500rpm then loses power stutters and wants to stall but catches itself. Then it will rev really high and eventually drop back down.Could a faulty lambda cause this? If its reading incorrect o2 then will the ecu go against this by over fuelling and breathing heavy, then if its breathing heavy that would mess up the idle? Im going for the lambda next on my list....But if you rev the engine at the throttle cable end the spring on the throtle valve feels like its slipping but only when the revs drop!!Im totally confused and fed up with this problem, plus the car is going through SOO much fuel..i got 140 miles out of a tank yesterday!!! If anyone could help i will reward them with beer... or donate an organ or something cos im at my wits end :-(might be a bit diffrent i had similar problems with my saxo ud be revving and it would stutter and feel like the power is being withtheld took it to a citroen specialist he diagnosed it as a faulty lamda sensore fixed it and it solved the problem it still wasnt 100% though it went from doing it 9 times outta 10 to around 1 or 2 timeshope that helps..? Quote Link to comment Share on other sites More sharing options...
DanH Posted February 18, 2007 Author Report Share Posted February 18, 2007 Thank you mate,I am going to take it for a lambda replacement on Tuesday and hope that fixes it, cos ive replaced the entire throttle body and its still doing it. I mean the lambda is screwed, i can see the exhaust soot actually coming through the sensor!But this is getting realy bad now..its like driving a Kanaroo. Hopefully this will fix it, but im all out of ideas, im thinking coil and all sorts now. Quote Link to comment Share on other sites More sharing options...
fgrig0 Posted July 9, 2007 Report Share Posted July 9, 2007 Hi all,Having a nightmare at the mo that I hope someone can advise me on?I was having major idle problems not so long ago and overheating probs. Back then we took the water pump out and swapped that as well as the Fan switch and thermostat. That sorted the overheating problem, at the same time we took the throttle valve control unit off and the manifold, gave them all a clean out and put it all back together again.That sorted the idle and stuttering loss of power and then sudden onset of power problem.Its back now though!!! I called VW and asked them how much a new unit would be and they came back with near on £300The car is seriously messed up..i will be driving along and it will lose power stutter and then burst back into life again. As said it has had new thermo, fan switch, plugs and I had cleaned all of the throttle body etc out not so long ago.Im thinking replace the whole unit? Can anyone recommend a good breakers or parts place? Thanks.Hi DanH,Have you solved the problem yet?It seems my car has the same problem (strongly fluctuating idle speed - abot 60% situations of idle case).Also - very low acceleration at very low speeds.Changed - thermal sensor (was broken), Lambda probe (out of range signal), injection cleaned.Do you have the answer?Thank you,fgrig0 Quote Link to comment Share on other sites More sharing options...
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