meandmyself777 Posted March 7 Author Report Share Posted March 7 Maybe it's just the way direct injection vws work, everyone that I knew with Mk5 gti,,'s had this issue and was apparently normal.. like I said as far as the cars aware it's perfectly healthy, no boost leaks, vacuum leaks, fault codes, I'm just replacing plugs because they have done nearly 10k and should be changed at that interval, and upgrading hpfp because race car 😁 Quote Link to comment Share on other sites More sharing options...
meandmyself777 Posted March 9 Author Report Share Posted March 9 Done a fair bit of logging fuel trims and seems that there is a fair bit of negative trims taking place up to 5% in places so probably where the misfires are occurring.. needs duty reduced in places.. I think 🤔 Quote Link to comment Share on other sites More sharing options...
Msportman Posted March 9 Report Share Posted March 9 Sounds like possible injector issue. I had one that went faulty at similar miles. I changed all four (costly) for peace of mind. It’s quite common on the 7/7.5 although rarely reported. Mine was APR stage 2 and I went thru similar elimination process ie changing to APR coils and NGK Race plugs. It was a dodgy DI Port injector so quite labour intensive it cost me circa £1k with labour fitting 4 injectors and vat. It was done back in 2019 by Retro Resus (VAG Race Team Specialists ) in Somerset who are Ecotune and APR against amongst others. Good luck. meandmyself777 1 Quote Link to comment Share on other sites More sharing options...
meandmyself777 Posted March 9 Author Report Share Posted March 9 1 hour ago, Msportman said: Sounds like possible injector issue. I had one that went faulty at similar miles. I changed all four (costly) for peace of mind. It’s quite common on the 7/7.5 although rarely reported. Mine was APR stage 2 and I went thru similar elimination process ie changing to APR coils and NGK Race plugs. It was a dodgy DI Port injector so quite labour intensive it cost me circa £1k with labour fitting 4 injectors and vat. It was done back in 2019 by Retro Resus (VAG Race Team Specialists ) in Somerset who are Ecotune and APR against amongst others. Good luck. I thought the injectors for the manifold were only £90 , how did it cost so much? Even if replacing all 4 where did the £600 labour go? Are you sure you don't mean a di injector and not a port injector, But it wouldn't surprise me if it was an injector cylinder 2 seems the worst but going to run a can of bg44k through before checking injectors.. Quote Link to comment Share on other sites More sharing options...
Msportman Posted March 11 Report Share Posted March 11 On 09/03/2023 at 22:11, meandmyself777 said: I thought the injectors for the manifold were only £90 , how did it cost so much? Even if replacing all 4 where did the £600 labour go? Are you sure you don't mean a di injector and not a port injector, But it wouldn't surprise me if it was an injector cylinder 2 seems the worst but going to run a can of bg44k through before checking injectors.. Yes it was a DI injector (typo error). I had them reconditioned and a spare set just in case. It was a while ago now but I remember all four were not cheap. They can leak or go fully open and have been known to destroy an engine if not caught in time. Mine had an intermittent lumpy idle/ misfire which was detected when we looked further. Quote Link to comment Share on other sites More sharing options...
meandmyself777 Posted March 12 Author Report Share Posted March 12 On 11/03/2023 at 02:06, Msportman said: Yes it was a DI injector (typo error). I had them reconditioned and a spare set just in case. It was a while ago now but I remember all four were not cheap. They can leak or go fully open and have been known to destroy an engine if not caught in time. Mine had an intermittent lumpy idle/ misfire which was detected when we looked further. If anything if think I might be a slight leak in cylinder 2 injector either di or mpi, or failing that the cylinder 2 is ever so slightly blocked, so I got the apr hpfp in and going to do some logging to see if there's any changes in, bg44k going in tomorrow and if it makes no difference its I will test injectors, the fact that it has misfires on all four cylinders doesn't mean there is problems with each cylinder, if you have one cylinder causing issues it will also cause issues in the other cylinders, but clearly cylinder 2 is the issue, but pretty certain at this point it's not the tune, otherwise it would be relatively equal across all 4.. its a big help being able to data log when tracing an issue.. will keep you updated, worse case scenario I have a few hours of work and and a new injector to go in.. Quote Link to comment Share on other sites More sharing options...
Msportman Posted March 12 Report Share Posted March 12 18 minutes ago, meandmyself777 said: If anything if think I might be a slight leak in cylinder 2 injector either di or mpi, or failing that the cylinder 2 is ever so slightly blocked, so I got the apr hpfp in and going to do some logging to see if there's any changes in, bg44k going in tomorrow and if it makes no difference its I will test injectors, the fact that it has misfires on all four cylinders doesn't mean there is problems with each cylinder, if you have one cylinder causing issues it will also cause issues in the other cylinders, but clearly cylinder 2 is the issue, but pretty certain at this point it's not the tune, otherwise it would be relatively equal across all 4.. its a big help being able to data log when tracing an issue.. will keep you updated, worse case scenario I have a few hours of work and and a new injector to go in.. I agree re data logging….I bought 4 new ones from AKS and Retro fitted them. They also tested the MPI injectors which were all good and fitted another set to confirm they were all good. I had old ones reconditioned and all been good ever since. I found changing from RS7 plugs to NGK Race together with APR coils really sharpened up response on my stage 2 set up. Only thing now to do is go TTV4! I’ve been stage 2 a good few years now (2017) but car only just turned 50k as I only use her occasionally weekends mostly summer or occasional trip to Castle Combe! TTV4 would be ideal for me 480-490 and cap torque to keep DQ250 happy although I never launch the car. The APR TCU software does a good job on that. Good to hear you’re properly looking into injectors as when I had mine done Retro said they had seen a fe issues arising some of which ended in disaster for the owners. Quote Link to comment Share on other sites More sharing options...
Msportman Posted March 12 Report Share Posted March 12 As a side note I see a few are retro fitting DQ381 box to early 7’s as they’ve become available used and a nice upgrade. Dan_Moore 1 Quote Link to comment Share on other sites More sharing options...
meandmyself777 Posted March 12 Author Report Share Posted March 12 54 minutes ago, Msportman said: As a side note I see a few are retro fitting DQ381 box to early 7’s as they’ve become available used and a nice upgrade. Mine is a 7.5 dq381, and is running the littco l450, running 440 hp and 400ftlbs, going in again for a retune in couple weeks, running 1.6 bar but peaking briefly at 1.8 this is down to the r600 being fitted after the original map. Still I'd be a bit pissed off if injector failed so early, thought with the mpi they would last longer than the old mk5s which were okay Upto 80k Quote Link to comment Share on other sites More sharing options...
Msportman Posted March 13 Report Share Posted March 13 On 12/03/2023 at 13:48, meandmyself777 said: Mine is a 7.5 dq381, and is running the littco l450, running 440 hp and 400ftlbs, going in again for a retune in couple weeks, running 1.6 bar but peaking briefly at 1.8 this is down to the r600 being fitted after the original map. Still I'd be a bit pissed off if injector failed so early, thought with the mpi they would last longer than the old mk5s which were okay Upto 80k I’m told the issue with injectors is quite common. One bit of advice is never use injector cleaner. It kills injectors and can lead to engine failure due to them being stuck open or debris falling into chambers. Quote Link to comment Share on other sites More sharing options...
meandmyself777 Posted March 13 Author Report Share Posted March 13 3 hours ago, Msportman said: I’m told the issue with injectors is quite common. One bit of advice is never use injector cleaner. It kills injectors and can lead to engine failure due to them being stuck open or debris falling into chambers. Never heard of proper injector cleaner causing injectors to fail.. VW themselves use the bg range, and my tuner says their products do what their supposed to, although they only help blocked injectors, they won't help a mechanical failure in them obviously.. its looking like an injector playing up, no logged codes and there's no knock or timing being retarded on any cylinders, so I'm going to ket this stuff run through the tank then go from there.. Quote Link to comment Share on other sites More sharing options...
Bingodalton Posted March 13 Report Share Posted March 13 Injector problem is common in previous gen's, since they have filter cup which can deteriorate.Sent from my SM-S901B using Tapatalk Quote Link to comment Share on other sites More sharing options...
Msportman Posted March 14 Report Share Posted March 14 6 hours ago, meandmyself777 said: Never heard of proper injector cleaner causing injectors to fail.. VW themselves use the bg range, and my tuner says their products do what their supposed to, although they only help blocked injectors, they won't help a mechanical failure in them obviously.. its looking like an injector playing up, no logged codes and there's no knock or timing being retarded on any cylinders, so I'm going to ket this stuff run through the tank then go from there.. I’m talking cheap off the shelf stuff at Halfrauds. My tuner always advises to stay clear of the stuff not that I need it. I got no EML but we found the offending injector after logging. meandmyself777 1 Quote Link to comment Share on other sites More sharing options...
meandmyself777 Posted March 14 Author Report Share Posted March 14 9 hours ago, Msportman said: I’m talking cheap off the shelf stuff at Halfrauds. My tuner always advises to stay clear of the stuff not that I need it. I got no EML but we found the offending injector after logging. Yeah I'm thinking I might just buy a new di injector and port injector, as the issue is clearly with cylinder 2, Quote Link to comment Share on other sites More sharing options...
Bingodalton Posted March 14 Report Share Posted March 14 I think you do not have issue with specific cylinder, it is just more affected. If it is injector, you would really feel the problem and had fault.Usually two inner cylinders are most affected. I am not sure why, but they usually have slightly more missfires.Sent from my SM-S901B using Tapatalk Quote Link to comment Share on other sites More sharing options...
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