bigchris1981 Posted February 18, 2013 Report Share Posted February 18, 2013 Morning all, Wondered if I could pick your minds... After 6 months of on/off misfires when warm, and a dead fuel pump, this weekend I replaced both the cats, both lambdas, both ignition amplifiers...took the car for a drive....and the warning lights cam back on. VCDS says there is intermittent voltage fault to cyl 2 and intermittent misfires on random cylinders. I tried swapping over coilpacks and the fault doesn't move. Not sure where to go next: 1 - Do I replace all the coilpacks and pencils on the off chance? 2 - Wondered about engine speed sensor? These seem to die across the VAG range and might explain the ESP light coming on? 3 - When MAF sensors die on MK4/5 golfs, they have a habit of putting the ESP light on...maybe the MAF? 4 - Intake manifold gaskets? 5 - other random air leaks? Any other suggestions? It's only when it's got warm (10-15 minutes of driving from cold), and the fault then stays until it's properly cooled down again. The logical bits of my brain that are still hanging on in there make me thing it must be a rubber/rubber covered component expanding or cracking open when it's warm...but the ESP thing...air leak?! ARGH. Link to comment Share on other sites More sharing options...
cruiser647 Posted February 18, 2013 Report Share Posted February 18, 2013 What about the amplifier for the coilpacks? and/or the connectors where they connect? Link to comment Share on other sites More sharing options...
bigchris1981 Posted February 19, 2013 Author Report Share Posted February 19, 2013 I have changed the amplifiers already...you mean the plugs that plug into them, or the other end? Do those bits of loom die then? Link to comment Share on other sites More sharing options...
cruiser647 Posted February 24, 2013 Report Share Posted February 24, 2013 I have changed the amplifiers already...you mean the plugs that plug into them, or the other end? Do those bits of loom die then? Yeah, that's what I meant. Oh! Coilpacks next then, I'm afraid. Link to comment Share on other sites More sharing options...
bigchris1981 Posted March 5, 2013 Author Report Share Posted March 5, 2013 Coilpacks and Spark Plug connectors on back order...sigh. Link to comment Share on other sites More sharing options...
cruiser647 Posted March 5, 2013 Report Share Posted March 5, 2013 Have you tried GSF and Eurocarparts? Link to comment Share on other sites More sharing options...
bigchris1981 Posted March 6, 2013 Author Report Share Posted March 6, 2013 Yes! Hoping to have a euros delivery on Monday. Beru just under £300 for the full set of 8. Link to comment Share on other sites More sharing options...
cruiser647 Posted March 7, 2013 Report Share Posted March 7, 2013 Hope that works! Link to comment Share on other sites More sharing options...
bigchris1981 Posted March 21, 2013 Author Report Share Posted March 21, 2013 After much ar$ing about the right bits should be with me in the morning...Euros sell three brands of coil...I got sent 4 beru, 3 BBT and 1 unknown random coild with chineese characters on the box Link to comment Share on other sites More sharing options...
bigchris1981 Posted March 26, 2013 Author Report Share Posted March 26, 2013 So, Beru who make the OE coils sell them through Euro Car parts with the spark plug connect...which is too short. ECP have now advised Beru that the spark plug connector they spec for the S8 is wrong. Now waiting on TPS (VAG) to supply the spark plug connectors to me tomorrow. New coils alone have not got rid of the misfire, fingers crossed that the old spark plug connectors are borked...otherwise, where do I look? :/ Link to comment Share on other sites More sharing options...
bigchris1981 Posted April 3, 2013 Author Report Share Posted April 3, 2013 Finally fixed yesterday. Number 4 injector was shorting under load when hot...but the code didn't show until the spark plug connecters had been replaced! Total now running at: Fuel pump, cats, lambdas, ignition amplifiers, coil packs, spark plug connectors and 1 x injector! Appears to be up and running better than at any time I've driven it...good times. Link to comment Share on other sites More sharing options...
patently Posted April 3, 2013 Report Share Posted April 3, 2013 Appears to be up and running better than at any time I've driven it...good times. Always nice when that happens Link to comment Share on other sites More sharing options...
bigchris1981 Posted April 3, 2013 Author Report Share Posted April 3, 2013 Always nice when that happens Yes! It's been a learning curve for sure, I'm now pretty good at speed stripping and rebuilding the coilpack/injector part of the engine...maybe I should get into competitive puzzle building? Link to comment Share on other sites More sharing options...
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