cheers for taking a look!Shoppinit wrote:Air flow looks OK.
What a bizarre problem. There must be a wiring problem somewhere. Broken earth wire maybe.
Check the earth connection.
where is the earth connection?
severe misfire at idle
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stealthyspeeder
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Re: severe misfire at idle
where is the earth connection?
Re: severe misfire at idle
That's a very good question.
Just looked at the electrical diagram and it seems there are 2 wires going to each coil. One from the ECU and the other from a fuse, so I'm guessing positive. And yet the procedure calls for checking the earth connection at pin 2 on the coil connector. This is the wire that goes to the ECU.
The coil connector is 4 pin, so maybe pins 3 and 4 are dummies? Can you have a look when you get a chance?
Pin 2 goes to the ECU, so maybe the ECU is switching to earth. Dunno. Would be interested in hearing anyone else's opinion.
Just looked at the electrical diagram and it seems there are 2 wires going to each coil. One from the ECU and the other from a fuse, so I'm guessing positive. And yet the procedure calls for checking the earth connection at pin 2 on the coil connector. This is the wire that goes to the ECU.
The coil connector is 4 pin, so maybe pins 3 and 4 are dummies? Can you have a look when you get a chance?
Pin 2 goes to the ECU, so maybe the ECU is switching to earth. Dunno. Would be interested in hearing anyone else's opinion.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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stealthyspeeder
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Re: severe misfire at idle
Whoa! right, yes now im well out of my depth! I dont know how I would actually test a wire for an earth connection! I was hoping to look somewhere and find something either broken or disconnected as the car was fine one minute and fecuked the next!
As its happening on all cylinders (I checked with VCDS, its not focused on a particular cylinder), if its an earth connection, is there an earth connection point further up the wire where they all merge together? (or to they earth at the engine?)
As its happening on all cylinders (I checked with VCDS, its not focused on a particular cylinder), if its an earth connection, is there an earth connection point further up the wire where they all merge together? (or to they earth at the engine?)
Re: severe misfire at idle
You could check the fuse, but I would have thought that if it had blown you wouldn't have any ignition at all. Fuse n° 32.
You would have to check the earth to the ECU.
The codes you've got are definitely an electrical problem, rather than misfiring caused by fueling. That's the weird thing.
Perhaps have a good visual inspection and see if anything ha been pinched or something?
Is your battery fully charged?
You would have to check the earth to the ECU.
The codes you've got are definitely an electrical problem, rather than misfiring caused by fueling. That's the weird thing.
Perhaps have a good visual inspection and see if anything ha been pinched or something?
Is your battery fully charged?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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stealthyspeeder
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Re: severe misfire at idle
Thanks a mill Shop! in a way thats good to hear!
I will have a gander at all the wires and check the fuses tomo, I think I will cry if I turn it on and hear it misfiring again this evenin!
I will have a gander at all the wires and check the fuses tomo, I think I will cry if I turn it on and hear it misfiring again this evenin!
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stealthyspeeder
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Re: severe misfire at idle
Nasty. 
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: severe misfire at idle
Very unlikely I know, but mine did something very similar this one day without any warning (at least from what I can tell from the clip). Turned out that the keyfob had lost sync with the ECU and this is what the mgmt did to the idle as a result of being started by an out-of-sync key. Went inside and tried the spare key and Bob's You Uncle - fixed. Had the first key reset at the dealer and it never happened again.
Just a thought...
Just a thought...
Re: severe misfire at idle
Thats bonkersR1NGA wrote:Very unlikely I know, but mine did something very similar this one day without any warning (at least from what I can tell from the clip). Turned out that the keyfob had lost sync with the ECU and this is what the mgmt did to the idle as a result of being started by an out-of-sync key. Went inside and tried the spare key and Bob's You Uncle - fixed. Had the first key reset at the dealer and it never happened again.
Just a thought...
usually when the key is not recognised the car starts for a few seconds then dies.Be very careful when checking the switched earths from the ECU, slightest bit of current the wrong way and it's fried. Best way is with a noid light or led test light.
Avus Avant, RNS-E mk2 with sds and Bluetooth, Milltek, Hotchkis, Bilstein, Forge, ITG, A.C.E, Wagner, FBMFSW, MTM.
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stealthyspeeder
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Re: severe misfire at idle
Afraid its not that. Starting the engine with the spare has the same effect!R1NGA wrote:Very unlikely I know, but mine did something very similar this one day without any warning (at least from what I can tell from the clip). Turned out that the keyfob had lost sync with the ECU and this is what the mgmt did to the idle as a result of being started by an out-of-sync key. Went inside and tried the spare key and Bob's You Uncle - fixed. Had the first key reset at the dealer and it never happened again.
Just a thought...
I might take a few pics and throw them up and see if you guys can stop anything out of place? failing that its getting recovered to a VAG specialist here in Dublin.
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stealthyspeeder
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Re: severe misfire at idle
Shoppinit wrote:You could check the fuse, but I would have thought that if it had blown you wouldn't have any ignition at all. Fuse n° 32.
YEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEESSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS!!
A million thanks Shop!
I think this is now the 3rd time your RS6 knowledge has has restored normally to my life in periods of RS6 distress! (I only have something like 50 posts!)
All good now! - Number 32 fuse it was!
Re: severe misfire at idle
Well, fcuk a dcuk...
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: severe misfire at idle
Freak.Shoppinit wrote:Fuse n° 32.
No matter where you go, there you are.
Re: severe misfire at idle
legendbam_bam wrote:Freak.Shoppinit wrote:Fuse n° 32.
Re: severe misfire at idle
I accept all contributions of alcoholic persuasion... 
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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