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Car Forum / Audi Cars / September 2007A6 misfire
I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and 4. I put in some fuel injector cleaner and replaced the plugs and Cyl #3 misfire went away. I replaced the coils on Cyl #3 and #4 but it still misfires. This is a very strange misfire. It misfires at idle, off idle and under load but seems to go away at 2000 rpm with no load and 2800 with load. This all started on the same day. Could it be fuel injectors? > I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and > 4. I put in some fuel injector cleaner and replaced the plugs and Cyl [quoted text clipped - 3 lines] > and 2800 with load. This all started on the same day. Could it be fuel > injectors? Is the compression OK? There's a scary chance that the head gasket blew out between the two cylinders. >> I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and >> 4. I put in some fuel injector cleaner and replaced the plugs and Cyl [quoted text clipped - 6 lines] >Is the compression OK? There's a scary chance that the head gasket blew >out between the two cylinders. ok, I'l confess to not knowing this for certain, but given the 2.7t is a V6, does Audi number the banks 1-3 and 4-6, or do they stagger (odds on one side, evens on the other)? /daytripper '00 s4 6spd Standing in front of the car facing the radiator: passenger side drivers side 3 6 2 5 1 4 / Radiator / > On Sun, 16 Sep 2007 13:47:45 -0700, Kevin McMurtrie > <mcmurtri@dslextreme.com> [quoted text clipped - 19 lines] > /daytripper > '00 s4 6spd >Standing in front of the car facing the radiator: > [quoted text clipped - 7 lines] > > / Radiator / Excellent. And that would, as I suspected, rule out a siamesed head gasket on a 2.7t between cylinders 3 and 4... /daytripper '00 s4 6spd > In article <1189947424.221814.238...@k79g2000hse.googlegroups.com>, > [quoted text clipped - 8 lines] > Is the compression OK? There's a scary chance that the head gasket blew > out between the two cylinders. Compression is fine >> I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and >> 4. I put in some fuel injector cleaner and replaced the plugs and Cyl [quoted text clipped - 6 lines] > Is the compression OK? There's a scary chance that the head gasket blew > out between the two cylinders. disconnect the battery and let the ecu set back to default..............reconnect and run. does it do it now. > >> I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and > >> 4. I put in some fuel injector cleaner and replaced the plugs and Cyl [quoted text clipped - 11 lines] > > does it do it now. Disconecting the battery may cause the ECU to loose its memory on the throttle body alignment settings, not a good idea unless you can re calibrate it ;-) Steve. >> >> I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and >> >> 4. I put in some fuel injector cleaner and replaced the plugs and Cyl [quoted text clipped - 17 lines] > >Steve. TBU recal after battery disconnect/reconnect: put key in ignition, turn to run position, wait three minutes. No biggie... /daytripper '00 s4 6spd > On Sun, 23 Sep 2007 23:30:34 +0100, "Steve68s" > [quoted text clipped - 31 lines] > > - Show quoted text - More info: I replaced the injector on cylinder #4. Bought a VAG reader at virtualvillage.com for $139 bucks. Reads OBDII and CAN too. I cleared the codes ran the engine and reread them. I got P1458, P0030 and P0304. Are you sre about the ECU? There is a test on the reader to test the ECU. What about the radio code when I disconnect the battery? >> On Sun, 23 Sep 2007 23:30:34 +0100, "Steve68s" >> [quoted text clipped - 31 lines] >P0304. Are you sre about the ECU? There is a test on the reader to >test the ECU. What about the radio code when I disconnect the battery? Who said anything about an ECU? P0030 is a bogus OBD2 code. Try again. The second digit cannot be 0. P0304 is a generic OBD2 code for cylinder 4 misfire. Got a bad coil pack? P1458 is an Audi-specific OBD2 code for "Exhaust gas temperature sensor 2 short to ground" /daytripper '00 s4 6spd > >> On Sun, 23 Sep 2007 23:30:34 +0100, "Steve68s" > [quoted text clipped - 43 lines] > > - Show quoted text - I must have written P0030 down wrong, It was a generic cylinder misfire. I already replaced the coil pack, spark plug (although it might be fouled again) and the injector. Could P1458 cause cylinder misfire? >> P0030 is a bogus OBD2 code. Try again. The second digit cannot be 0. >> P0304 is a generic OBD2 code for cylinder 4 misfire. Got a bad coil pack? [quoted text clipped - 10 lines] >might be fouled again) and the injector. Could P1458 cause cylinder >misfire? I don't know, sorry. I would expect the *bank* for that sensor to exhibit symptoms, not just one of the three cylinders, but I suppose even that could be in doubt. I'd certainly try to resolve that first, however, and see what happens next. /daytripper '00 s4 6spd > >> P0030 is a bogus OBD2 code. Try again. The second digit cannot be 0. > >> P0304 is a generic OBD2 code for cylinder 4 misfire. Got a bad coil pack? [quoted text clipped - 20 lines] > > - Show quoted text - I switched the ignition modules and all the codes went to the other bank. It's the module nothing else. > > >> P0030 is a bogus OBD2 code. Try again. The second digit cannot be 0. > > >> P0304 is a generic OBD2 code for cylinder 4 misfire. Got a bad coil pack? [quoted text clipped - 25 lines] > > - Show quoted text - I changed the ignition module. No codes left and car runs great. > I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and > 4. I put in some fuel injector cleaner and replaced the plugs and Cyl [quoted text clipped - 3 lines] > and 2800 with load. This all started on the same day. Could it be fuel > injectors? How do you know you have a misfire? You need to get the codes pulled. Go to Autozone, they can do it for free. Then you can find out via Google exactly what the issue is. Dan D '04 A4 1.8Tq MT-6 Central NJ USA > > I have a misfire on my Audi A6 2.7t Quattro. It started on Cyl #3 and > > 4. I put in some fuel injector cleaner and replaced the plugs and Cyl [quoted text clipped - 11 lines] > '04 A4 1.8Tq MT-6 > Central NJ USA My neighbor has an ODB2 code reader. It says misfire on cylinder #4. I can't get more specific without a VAG reader. |
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