Guest ttam lleb Posted August 2, 2003 Report Posted August 2, 2003 Have a 2002 new shape tdi 115, when at normal running temp I think third and fourth gear lackpower, at higher revs in third ( car not fully laden) it seems to hold back then give a little then give a bit more, is it the engine managment giving power as IT seems fit. The car has done 55k and is fully maindealer serviced, fourth gear does the same. please help Quote
Guest SA Intruder Posted August 2, 2003 Report Posted August 2, 2003 Easy to try is disconnect MAF sensor at connector. If same or improvement, replace. There were 2 makes fitted during production, Pierburg and Bosch. Bosch one is notoriously weak. Failure rate massive on all TDi fitments on VWs. Make sure only genuine air filter used (which should be the case if Main dealer serviced). If the loss of power is continuous, your inlet manifold and/or EGR valve may be gummed up. This is an involved procedure to correct, but well documented. All VW TDIs will suffer from this eventually. How soon depends on many things.... Quote
Guest SHELLMAST1 Posted August 2, 2003 Report Posted August 2, 2003 HAD SAME PROB CHANGED MAF NO DIFFRENCE SO TOOK IT TO FORD ONTO COMP FOUND BOOST PRESSURE SELONOIED DOWN Quote
Guest SA Intruder Posted August 2, 2003 Report Posted August 2, 2003 Unusual fault. The entire EGR system on the VW TDi is its achilles heel. The Yank TDI sites have pages of info on it. Quote
kevinp Posted August 3, 2003 Report Posted August 3, 2003 :) :) Oh Dear Oh Dear. After keeping reading all the loss of power topics, I fear it's happened to me this very afternoon. (1998 Galaxy TDi, 90k). Driving round the south M25 with no problems at a steady 75-80mph (sorry 70 mph, officer) including the uphill Pole Hill section, at about Swanley the power dropped away and I struggled to keep going at 50 to 60 mph. It seems like I've lost the Turbo boost???. Limped home and checked for anything obvious - nothing seen, no loss of fluids or nasty messes under the bonnet. Reading the above and other pages, I assume the MAF sensor - no evidence of this being replaced before according to service history. Strangely enough over the last couple of weeks I was noticing a "flat spot" at about 60mph/3000rpm which seemed to disappear when the revs increase. I was noticing this more today before all the power suddenly went. Interested to read also the possible EGR valve or air inlet or indeed boost solenoid possibilities. Unfortunately, I need the car for holidays in a couple of weeks time so it looks as if I'll have to get it into a Ford dealer straightaway if i can, rather than spend time to have a look myself. I may well try disconnecting the MAF sensor first thing tomorrow, looks like it's easy to do quickly (top left according to the Haynes manual). Will keep you informed. :( :( Quote
Guest SA Intruder Posted August 3, 2003 Report Posted August 3, 2003 Takes moments to unplug....don't remove the sensor...! Quote
kevinp Posted August 4, 2003 Report Posted August 4, 2003 Monday am - Fully intended to drive it a short distance to confirm the problem then unplug the MAF but guess what. The car is as good as gold this morning. This worries me as therefore may be an intermittent problem. I will try to pop out from work later and give it a good thrashing in the warm to see if it re-occurs. Anyone know of history of sensors or electronics failing when hot etc? Doesn't bode well for the forthcoming holiday! :angry: Quote
Ivor_E_Tower Posted August 4, 2003 Report Posted August 4, 2003 Could some kind person confirm what happens when the MAF sensor is diconnected - does the problem remain, or does the ECU realise that the MAF's gone, and so enter a "get you home" mode, so that engine performs almost as it should normally do?TIAIvor Quote
Guest SA Intruder Posted August 4, 2003 Report Posted August 4, 2003 If the sensor is bust, the engine performs badly. If it is disconnected, the ECU runs on preset values that are close to the normal. Therefore there is a distinct improvement, but not complete. Kevin....it still can be the MAF. When the engine is switched off, the hotwire in the MAF is made to glow red hot to burn off contaminants. May effect a partial correction. Are you using genuine air filter? Quote
kevinp Posted August 4, 2003 Report Posted August 4, 2003 I've only had the car since end of May but always been serviced from new by a local Ford dealer according to service history - therefore must assume that all parts fitted etc are genuine Ford. Quote
Guest reefer Posted August 4, 2003 Report Posted August 4, 2003 Moving over to the thread that the entire EGR system on VW diesels is its Achilles heal, what sort of problems / symptoms occur with defect EGR systems ?.S A Intruder, what is your experience with the EGR system on our beloved VW TDi's ? Quote
Guest SA Intruder Posted August 4, 2003 Report Posted August 4, 2003 The EGR valve itself allows crank fumes into the inlet manifold. Both get blocked by sticky black goo. In time, this turns into hard deposits. The EGR begins to malfunction, and the power gradually reduces as the manifold gums up. The only cure is to remove it all and clean. You CANNOT do it succesfully on the vehicle, and you risk all sorts of debris entering the engine. You only need a few gaskets and seals to do the job, and you get good access by undoing the timing belt end mount and sliding the engine forward at that point. I have done my dad's Passat 110 and my mate's Shagam 115 in this way. The Passat had 60000 miles on it, and had evidence of poor quality oil. The Shagam had 85000 miles and a full dealer history. Both were lethargic to drive, with power reducing with revs. Fiddly, but worth it. For those people with VAG-COM, there is a well documented mod to the EGR section which closes the EGR more and prevents the problem. The US sites have the procedure. Quote
Ventoux Posted August 4, 2003 Report Posted August 4, 2003 .... and where ire "The Yank TDI sites " ?? V. Quote
rcms Posted August 4, 2003 Report Posted August 4, 2003 I hope as a new member the following will help somebody.Earlier this year My 90bhp 1.9tdi lost power and drivability.After reading this site I tried the above re MAF sensor and sure enough it was stuffed! Further reading suggested as well as changing the MAF there was also a set of plastic components (modified air intake etc.) available. After spending Quote
Guest reefer Posted August 4, 2003 Report Posted August 4, 2003 Thanks Intruder for sgaring your knowledge and experience with us.Think I will strip and clean my EGR piping etc this weekend. Quote
kevinp Posted August 4, 2003 Report Posted August 4, 2003 Gave my 1.9Tdi 110 a good 50 mile run up the A12 at lunchtime today. The major power loss did not re-occur but at about 80mph/3000rpm I could occasionally feel the power just "cutting back". It certainly doesn't feel quite right. I was hoping for the power loss to occur so I could whip out the MAF connection and re-try it. Just a point about running with MAF sensor disconnected (because I am a coward) - is it OK to run at high speed and for some distance or can it cause any damage/problems. If OK then I may unplug it and repeat my 50 mile run again to see if there is any difference. Interested in everyone's comment on the EGR gumming up. Not sure if I interpreted SA Intruder's comments correctly about "cannot be done on engine". I assume you meant you need to remove the valve for cleaning but noting you saying "...slide the engine forward...." suggests something more major - you didn't infer the engine has to come out did you? (sorry for my stupidity). Sounds like it may be worth doing an EGR clean. Quote
Guest SA Intruder Posted August 4, 2003 Report Posted August 4, 2003 Engine doesn't have to come out...just undo the bolts holding the mount to the body (easy) and pull the engine forward at that side. It is a flat surface (you can see this just by looking under the bonnet. This gives you more room at the back. I raised the car slightly too and undid the undercover tray thing...six bolts from memory. This gave me clear views all around. I took the air filter box off too...easy and again, gives you much needed room. Of course, remove the dirty great plastic engine cover....which I always do to "successfully" top the oil up without spillage. Quote
Ivor_E_Tower Posted August 4, 2003 Report Posted August 4, 2003 Wouldn't a funnel be easier and quicker to top up oil without spilling any - rather than removing plastic engine top cover? That's what I've used on previous cars. Quote
Guest SA Intruder Posted August 4, 2003 Report Posted August 4, 2003 Can't get a funnel in. Even the bendy ones. Cover is dead easy to remove anyway..... Quote
Guest SA Intruder Posted August 4, 2003 Report Posted August 4, 2003 I'll let the dealer do that for me. Quote
Guest SA Intruder Posted August 5, 2003 Report Posted August 5, 2003 That mount...it's the Torx bolts you undo... Quote
Ivor_E_Tower Posted August 5, 2003 Report Posted August 5, 2003 Great shots - like the one of the undertray you took for me a few months ago. What camera are you using? I take it that you are using the flash? Quote
Guest SA Intruder Posted August 6, 2003 Report Posted August 6, 2003 It's a fairly basic, but excellent, Fuji Finepix A204. Quote
Guest SA Intruder Posted August 6, 2003 Report Posted August 6, 2003 One of the better Yank (actually Canadian) sites: http://www.tdiclub.com/ Quote
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