alexc Posted August 10, 2003 Report Share Posted August 10, 2003 What are the symptoms of a failed Forge DV? Was driving my Golf back from a VW show in Belgium this weekend and decided to play with a 911 Carerra 4, anyway I overtook him at the wrong side of 150! And as I kept on going I suddenly fealt the engine just hold back, it now runs like a bag of spanners, all the vital signs seem OK, oil & water temps dropped back to normal, no nasty knocking from the engine but it's idling very lumpy and doesn't accelerate smooth and uses more fuel. Also the boost gauge needle jumps around a bit on idle which isn't normal which leads me to believe that it might be the DV or maybe I've got a loose boost hose but the hoses seem to be in place. The Turbo seems to spin up OK, so I don't think it's damaged but then again I could be wrong. Any ideas? Cheers in Advance Guys! Quote Link to comment Share on other sites More sharing options...
Ben Posted August 11, 2003 Report Share Posted August 11, 2003 Sounds like a coil pack is on it's way out. Good luck, Ben Quote Link to comment Share on other sites More sharing options...
Hopsta Posted August 11, 2003 Report Share Posted August 11, 2003 I thought that Alex didn't have the coil pack system on his car ? Quote Link to comment Share on other sites More sharing options...
alexc Posted August 11, 2003 Author Report Share Posted August 11, 2003 [ QUOTE ] I thought that Alex didn't have the coil pack system on his car ? [/ QUOTE ] You're right Graham, I decided against running coilpacks, far too unreliable, I just run a central coil and normal HT leads. I have a feeling it could be a problem with the MAP sensor, I'll have a closer look tomorrow, I'll also plug the laptop into the DTA brain and check for any fault codes. Quote Link to comment Share on other sites More sharing options...
Ben Posted August 12, 2003 Report Share Posted August 12, 2003 It won't be the coil packs then If you disconnect the connector into the MAF then the car should gain it's readings the best it can from elsewhere. I had a bad MAF on my car and one of the tests that Mitch from REVO did was just that. Mind you, I didn't have a bad a problem as yours sounds. I've also had loose hoses on my old A3 and that didn't cause the car to misbehave, just make more whoosing noise when on boost and generally not go as well. I've got my old MAF and housing if you want it mate, it still works, just not very well. Hope the VAGCOM finds something for you mate, Ben Quote Link to comment Share on other sites More sharing options...
Drillslinger Posted August 12, 2003 Report Share Posted August 12, 2003 Dude, how long can you run with the MAF unplugged? And does it create any error codes? Quote Link to comment Share on other sites More sharing options...
Ben Posted August 12, 2003 Report Share Posted August 12, 2003 Pass, but we went for a 10 minute blast. I don't remember having any codes cleared, but you would have thought that it would bring up one or two! I presumed the car wouldn't run with the MAF disconnected but it ran pretty well. Quote Link to comment Share on other sites More sharing options...
Drillslinger Posted August 12, 2003 Report Share Posted August 12, 2003 Just wondering as I've recently gotten some hesitation at around 5k revs, and wanted to discount the MAF as a problem. But the only time I can really get a good drive in, is on my way home from work, which is an hour + drive Quote Link to comment Share on other sites More sharing options...
Ben Posted August 12, 2003 Report Share Posted August 12, 2003 Well, stop after 10 minutes and reconnect it then! Quote Link to comment Share on other sites More sharing options...
Drillslinger Posted August 12, 2003 Report Share Posted August 12, 2003 Not many places to pull over on the Autobahn Dude Plus, at 200 kph it (stopping) becomes something of a chore Quote Link to comment Share on other sites More sharing options...
gambba Posted August 12, 2003 Report Share Posted August 12, 2003 Well in theory it should create a fault code, as the ECU is looking for an output from the MAFS circuit board, and when it doesn't see that it should revert back to a factory setting for the MAF, limiting performance, and secondly should log the fault. It depends if Audi/Bosch have decided that a MAF fault is important enough to log that sort of fault. The above is based on Nissan engines which use basically the same setup, and I know a bit about them...it's my job! Quote Link to comment Share on other sites More sharing options...
Drillslinger Posted August 12, 2003 Report Share Posted August 12, 2003 Dude.... you WORK?!?! Quote Link to comment Share on other sites More sharing options...
Mo-S3 Posted August 12, 2003 Report Share Posted August 12, 2003 Apparently, my dealer has told me that MAF's dont log faults for some weird reason thats why they have problems diagnosing them. Quote Link to comment Share on other sites More sharing options...
alexc Posted August 13, 2003 Author Report Share Posted August 13, 2003 Did some more inspection work today, DV fine, MAF fine, all hoses present & correct. Then I decide to remove the plug leads (no coilpacks remember), removed the plugs......... and I find that cylinder no.3 has completely melted the end of my platinum plug! Out comes the compression tester, cylinders 1, 2 & 4 are fine, cylinder 3 has feck all compression. Looks like the head's coming off, I just hope it's a valve and not a piston. Bugger!! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.