Dave-G Posted January 19, 2007 Report Posted January 19, 2007 My TDI 'feels' like it has a misfire like you get on a petrol. I took it down to a local guy with vag-com for a quicky. Brake swith has had implausible signal at some time - but all the brake lights work ok. The guy took it for a spin with vag-com still connected... the 'chugging' occured but nothing shows on the vag-com. He suspects early indicaction of injector problem - but suggested I took it to the main dealer for more in depth checkover.Well sods law it dint occur on a test drive with them and anyway - "their diagnostic equipment is not to good with the VW engine issues" - try VW dealer. A quick chat with said VW indicates they know of an electrical issue with the injectors - bring it in on tuesday for a test drive. So - Forewarned is forearmed - any ideas? Quote
Guest flubber01 Posted January 19, 2007 Report Posted January 19, 2007 possible needle lift sensor? or dodgy injector loom wiring/connection? see if you can get a fault code? possible, 18074 - valve from pump cylinder 1 electrical problem in circuit, this fault has been know to cause a misfire and loss of power! I just happen to be reading a similer post on another forum! SPOOKY or what? Quote
seatkid Posted January 19, 2007 Report Posted January 19, 2007 Nah...try a new fuel filter (or drain it) if it hasnt been changed in ages - could be water. Quote
littledaz Posted January 19, 2007 Report Posted January 19, 2007 If filter doesn't help, can you get your VagCom man to readout MVB's 13, 18 & 23.These are the readings for you're injectors. Can you then post you're findings so, I can have a look.Might be able to point you in the right direction. Obviously, this must be done when the chugging/misfiring occurs to get a good indication if it is an injector issue. ld Quote
seatkid Posted January 19, 2007 Report Posted January 19, 2007 Whats an 05/05 Tdi? If its 2005 its under warranty...... Quote
seatkid Posted January 19, 2007 Report Posted January 19, 2007 Just looked at your profile, looks as if you have a PD (we dont refer to them as a TDi here...), in that case your injector(s) may be duff, them unit injectors are electrically controlled, and theres the potential of camwear due to wrong oil. Quote
NikpV Posted January 19, 2007 Report Posted January 19, 2007 Whats an 05/05 Tdi? If its 2005 its under warranty...... surely would depend on the mileage Quote
littledaz Posted January 19, 2007 Report Posted January 19, 2007 can you get your VagCom man to readout MVB's 13, 18 & 23. forgot to say, should really be tested at idle and light throttle. If chugging occurs under load only, this may not help but, worth a look before replacing anything. Quote
Dave-G Posted January 19, 2007 Author Report Posted January 19, 2007 SK - 05 year - 05 plate Ld - There didnt seem to be anything else available. Interestingly... the problem only occurs at idle and very light throttle/constant speed, but at all speed ranges. Quote
Dave-G Posted January 19, 2007 Author Report Posted January 19, 2007 Darn this no edit thing... I considered the fuel filter - till I found it still does it at speeds too. Quote
Dave-G Posted January 19, 2007 Author Report Posted January 19, 2007 DARN THIS NO EDIT TING :lol: 21k miles on the clock. Now an interesting bit from the ford guy... Allegedly - they only get paid by ford for things they can prove are faulty - so unless they can prove the problemo - no warranty repairo! May be hypothetical as the book aint been stamped - ever... yet. The previous owners have indicated they will stamp it up for me - its an ex Hertz car and they do their servicing in house. with me so far? Now the other bit - as there was no stamp - I insisted on a warranty. We agreed that they would pay for a year if I bought a second years warranty from car care - which I know pays main dealer prices because they paid for my autobox the first time it failed on my last car... bought from the same firm. Quote
littledaz Posted January 20, 2007 Report Posted January 20, 2007 Ld - There didnt seem to be anything else availableNot sure what you mean. No MVBs available or no signifcant data in MVB? Check the example from my Galaxy below showing good readings and compare with yours. Quote
Dave-G Posted January 20, 2007 Author Report Posted January 20, 2007 Thanks LD - I'll get down there monday morning. What would we be looking for there if the fault is occuring please? Quote
Dave-G Posted January 21, 2007 Author Report Posted January 21, 2007 I found a wee little straw to clutch at while waiting till I can get it back to the vag-com. Recall there was an implausible signal fault recored at some time? - While at the VW dealers, and to rule it out of the equation, I got a brake light switch from VW for a 115 bhp auto, 02/03/05 build date sharan...thinking it should be the same? Well the new switch is black - as was the one's I have replaced in my other galaxy's.... but the one in this Galaxy is purple and "more rounded" in shape...does that sound right anyone? Could someone with a later car have a quick peek through their fuse box cover for me Quote
Dave-G Posted January 21, 2007 Author Report Posted January 21, 2007 The centre picture shows where it is located when viewed through the fuse box access Quote
NikpV Posted January 21, 2007 Report Posted January 21, 2007 I've just had a look but on my 2001 auto there is nothing at all where the the purple switch is in the centre view :) Quote
Dave-G Posted January 21, 2007 Author Report Posted January 21, 2007 TCH PUH-LEASE... WHY CAN'T WE HAVE OUR EDIT BUTTON BACK GLEN? Could I be looking at the wrong switch. It's not that I'm too fat or lazy to get down and pull things around, I have had an operation on my left hand and every time I stretch it open too far the wound cracks open. Some of the stitches gave up last week! I'm not sure if there is a another switch further up - although I seem to recall there was only one on my last (02 reg) auto. And it may be that the one on an auto differs from a manual? Quote
Dave-G Posted January 21, 2007 Author Report Posted January 21, 2007 oer nik - now there's a thing? Quote
NikpV Posted January 21, 2007 Report Posted January 21, 2007 oer nik - now there's a thing? ummm will try and take a picture later but I am breakfasting with/in/around kids atm :) Quote
Dave-G Posted January 21, 2007 Author Report Posted January 21, 2007 Thanks Nik - but I believe you :) Quote
Dave-G Posted January 21, 2007 Author Report Posted January 21, 2007 Well I carefully got down below for a closer look - sounds pervy huh? There is only one switch - and it's plunger is totally different to usual - being a smooth rod about 3.5mm diameter... rather like the refill of a ball point pen. Two thoughts occur - one is it's a totally wrong switch - giving implausible results. Or an improved switch due to the known issues with the old type - but as the new one I bought yesterday was the same as the other ones I have replaced in the past, this seems unlikely. Quote
littledaz Posted January 21, 2007 Report Posted January 21, 2007 What would we be looking for there if the fault is occuring please?If the fault is a misfire on a cylinder, you should see the engine ecu trying to combat it by altering the injection values in MVB 13. Minus figures reducing fuel and plus figures adding fuel to smooth it out. Extreme figures away from zero indicate a misfiring cylinder, most probably injector. MVB 18 should be on zero, anything else indicates a possible fault with injector solenoid valve. MVB 23 usually injector solenoid duration, may differ on various ecus, need to concentrate on MVB 13 & 18. Or an improved switch due to the known issues with the old type Looks like you've got the latest VW/Audi brake light switch there, Dave-G. They used to be blue or black, had loads of problems with them, I am now fitting purple (modified) ones. Generally, you should get engine management light on with brake light switch faults. Doubt you would get a misfire but, don't quote me on that. Quote
Dave-G Posted January 21, 2007 Author Report Posted January 21, 2007 Thanks LD, The switch issue seems to be ruled out now, good. Looking at your vag-com printout... The lower line of group 23 shows a major different value on cyl 2 - is that correct? Quote
littledaz Posted January 21, 2007 Report Posted January 21, 2007 The lower line of group 23 shows a major different value on cyl 2 - is that correct? Sorry, I think some ecu's don't use MVB 23 in the way I use it at work on Audis. MVB 23 is not documented in VagCom for my ecu part number but, is for others. This leads me to think it is not used for injector reference on all ecus. Concentrate on MVBs 13 & 18 as these don't alter from ecu to ecu. Still look at MVB 23 on yours though, it may show something relevant. If under your MVB 23 readings you have a "m/s" reference, this is your injector solenoid valve duration. I'm interested to see what your readings are. Quote
Dave-G Posted January 22, 2007 Author Report Posted January 22, 2007 Well LB, I've been down to see him again - no charge this time either 'cos Iput Quote
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