Srobbo18 Posted July 21, 2007 Report Share Posted July 21, 2007 hi i have a mk4 golf v5, 1999 10valve. under slight acceleration round about 1800-2200 rpm it has a power loss, if i boot it it seams to accelerate ok. i just changed air filter oil and plugs,any ideas what it might be. it was happening before service. i also tried injector cleaner. i thought maybe try new petrol filter, or could it be mass air flow or lambard probe or ????????/ Link to comment Share on other sites More sharing options...
Mook Posted July 23, 2007 Report Share Posted July 23, 2007 MAF sensor (a.k.a. Mass Air Flow Meter) is your most likely cause. Around £70 from your VW dealer Link to comment Share on other sites More sharing options...
Srobbo18 Posted July 24, 2007 Author Report Share Posted July 24, 2007 hi had the MAF changed about 2 years ago, could it go again so soon ????? Link to comment Share on other sites More sharing options...
Mook Posted July 24, 2007 Report Share Posted July 24, 2007 Yes. MAFs are horribly unreliable. Link to comment Share on other sites More sharing options...
Srobbo18 Posted July 25, 2007 Author Report Share Posted July 25, 2007 will try that. thanks Link to comment Share on other sites More sharing options...
Srobbo18 Posted July 29, 2007 Author Report Share Posted July 29, 2007 Hi please help i have tried unpluging the maf meter and still the same problem so does this rule that out as a source of the problem or sould i still try replacing the maf. i checked all the hoses took of the air tube between filter and injector inlet tube. there was quite alot of oil in it and the round flat plate that turns whith the throttle was very dirty, like a black layer of dirt biult up on it. is this a problem do i need to do anything about it. Link to comment Share on other sites More sharing options...
Srobbo18 Posted July 29, 2007 Author Report Share Posted July 29, 2007 oh yes just to add the problem has developed from a flat spot to a guddering with little power, will go on for about 20 seconds then full power will come back and car will drive fine please help. Link to comment Share on other sites More sharing options...
Srobbo18 Posted July 30, 2007 Author Report Share Posted July 30, 2007 this prob gets worse when car is warm. any ideas Link to comment Share on other sites More sharing options...
Mook Posted July 30, 2007 Report Share Posted July 30, 2007 [ QUOTE ] Hi please help i have tried unpluging the maf meter and still the same problem so does this rule that out as a source of the problem or sould i still try replacing the maf. [/ QUOTE ] That's exactly how to test for the problem. When it's removed, there's no metering going on. When you unplug it, it's exactly the same, so there's no metering going on when it's plugged in. Replace the MAF Link to comment Share on other sites More sharing options...
Srobbo18 Posted July 31, 2007 Author Report Share Posted July 31, 2007 thanks for clearing that up i will get new one asap Link to comment Share on other sites More sharing options...
Srobbo18 Posted August 3, 2007 Author Report Share Posted August 3, 2007 hi changed MAF what a difference, its much better no juddering, much more responsive. However still getting a flat spot on occasion (happened when overtaking lorry not cool) lasts for a second or so, then full power comes back. any ideas. please help Link to comment Share on other sites More sharing options...
Srobbo18 Posted August 4, 2007 Author Report Share Posted August 4, 2007 just had a bit of juddering back Link to comment Share on other sites More sharing options...
Srobbo18 Posted August 5, 2007 Author Report Share Posted August 5, 2007 seems worse when car is warm / hot happens alot as temp gage reaches midle/ as hot as it goes Link to comment Share on other sites More sharing options...
Srobbo18 Posted August 13, 2007 Author Report Share Posted August 13, 2007 hi juddering still keeps comming back, sounds like a machine gun when it happens, any one got any ideas at all what it might be, as its not MAF, could it be a coil pack or an injector fault or something else electrical ????? Link to comment Share on other sites More sharing options...
Mook Posted August 13, 2007 Report Share Posted August 13, 2007 Coil packs are the next option to look at. Replace them all, rather than one at a time. It's likely to be cylinder #1, as this gets the hottest. Link to comment Share on other sites More sharing options...
Srobbo18 Posted August 13, 2007 Author Report Share Posted August 13, 2007 Thanks any idea how much they cost ? please Link to comment Share on other sites More sharing options...
Mook Posted August 14, 2007 Report Share Posted August 14, 2007 About £75 each IIRC. Check with your VW dealer, though Link to comment Share on other sites More sharing options...
Srobbo18 Posted August 30, 2007 Author Report Share Posted August 30, 2007 hi just put on a second hand coil pack that i am sure is working , (all HT leads are sparking while engine is running poorlory) will try new leads as well. any other sugestions, they are new spark plugs so they sould be ok, or sould i check them. Link to comment Share on other sites More sharing options...
Srobbo18 Posted February 17, 2008 Author Report Share Posted February 17, 2008 ok just an update, since the last post i have fitted new fuel pump did not help just fitted new ignition amplifier which seams to have done the trick Link to comment Share on other sites More sharing options...
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