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Audi A6 Avant Ignition no-go!.
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#1
 
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Audi A6 Avant Ignition no-go!. -
05-25-2006
, 06:02 PM
#2
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Hi, My formerly, till this afternoon, trusty old steed 1995 vintage, was going fine till I parked up and went to re-light a few hours later and simply no-go!. A bit of investigation revealed that there was no sparks to be found anywhere. Fortunately I happened to have some tools with me and a multi meter and discovered that there were around 11 volts on the two coil primary windings. I was offered a lift back home and I seemed to remember that some Audis had problems with ignition coil failures so with not that much to loose, I took the coil off and bought it back home and a few checks with a multi meter revealed the right , according the Haynes manual, resistance's. However I connected the coil across a small 12 volt battery and took another bit of wire from the HT output terminal and formed a small "spark gap" with that to one of the other primary terminals, and when you "flick" the wire from the battery onto the primary terminals there is only a tiny feeble 1 millimetre long spark. I would have thought that this should be a lot more than that and suspect that perhaps the coil has "shorted turns" perhaps?. ....or the battery is flat. Just a thought. |
--
Conor,
Grumpy Old Man.
Same shit, different day.
#3
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Hi, My formerly, till this afternoon, trusty old steed 1995 vintage, was going fine till I parked up and went to re-light a few hours later and simply no-go!. A bit of investigation revealed that there was no sparks to be found anywhere. Fortunately I happened to have some tools with me and a multi meter and discovered that there were around 11 volts on the two coil primary windings. I was offered a lift back home and I seemed to remember that some Audis had problems with ignition coil failures so with not that much to loose, I took the coil off and bought it back home and a few checks with a multi meter revealed the right , according the Haynes manual, resistance's. However I connected the coil across a small 12 volt battery and took another bit of wire from the HT output terminal and formed a small "spark gap" with that to one of the other primary terminals, and when you "flick" the wire from the battery onto the primary terminals there is only a tiny feeble 1 millimetre long spark. I would have thought that this should be a lot more than that and suspect that perhaps the coil has "shorted turns" perhaps?. Anyone else had a similar experience with this sort of problem on these cars?. |
If its the inline 4 2litre, then almost certainly its the amp mounted under
/next to the coil.
Tim..
#4
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Hi, My formerly, till this afternoon, trusty old steed 1995 vintage, was going fine till I parked up and went to re-light a few hours later and simply no-go!. A bit of investigation revealed that there was no sparks to be found anywhere. Fortunately I happened to have some tools with me and a multi meter and discovered that there were around 11 volts on the two coil primary windings. I was offered a lift back home and I seemed to remember that some Audis had problems with ignition coil failures so with not that much to loose, I took the coil off and bought it back home and a few checks with a multi meter revealed the right , according the Haynes manual, resistance's. However I connected the coil across a small 12 volt battery and took another bit of wire from the HT output terminal and formed a small "spark gap" with that to one of the other primary terminals, and when you "flick" the wire from the battery onto the primary terminals there is only a tiny feeble 1 millimetre long spark. I would have thought that this should be a lot more than that and suspect that perhaps the coil has "shorted turns" perhaps?. Anyone else had a similar experience with this sort of problem on these cars?. |
spark.
is the cambelt still intact and turning? they usually fail at start up.
otherwise it is connections, immobiliser, crank sensor, ign module, etc.
if you are in the aa get them out.
mrcheerful
#5
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"tony sayer" <tony (AT) bancom (DOT) co.uk> wrote in message news:Ys91VIA7lidEFwCa (AT) bancom (DOT) co.uk... Hi, My formerly, till this afternoon, trusty old steed 1995 vintage, was going fine till I parked up and went to re-light a few hours later and simply no-go!. A bit of investigation revealed that there was no sparks to be found anywhere. Fortunately I happened to have some tools with me and a multi meter and discovered that there were around 11 volts on the two coil primary windings. I was offered a lift back home and I seemed to remember that some Audis had problems with ignition coil failures so with not that much to loose, I took the coil off and bought it back home and a few checks with a multi meter revealed the right , according the Haynes manual, resistance's. However I connected the coil across a small 12 volt battery and took another bit of wire from the HT output terminal and formed a small "spark gap" with that to one of the other primary terminals, and when you "flick" the wire from the battery onto the primary terminals there is only a tiny feeble 1 millimetre long spark. I would have thought that this should be a lot more than that and suspect that perhaps the coil has "shorted turns" perhaps?. Anyone else had a similar experience with this sort of problem on these cars?. unless you introduce a condenser as well then you will only get a feeble spark. |
did indeed get it better. But in the original design thats not there is it?,
it seems that the ignition amplifier is just a simple semi conductor switch
that takes the output of the ECU and "amplifies" the switching pulse from
that..
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is the cambelt still intact and turning? they usually fail at start up. |
Quote:
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otherwise it is connections, immobiliser, crank sensor, ign module, etc. |
Actually went back to site this am and re fitted coil etc and switched on and
started first time and been running ever since!. Took a scope to the ign amp
input and output and very much as expected low amplitude slightly sloped pulse
and on the output side much larger with some ripple and overshoot and big fat
sparks!..
Mystery. absolute mystery!,suppose something is intermittent or the
immobiliser has got its nickers in a twist. Wonder if it might be due to being
parked right next to a radio transmitter site, 'tho nothing would have changed
since yesterday afternoon!!!..
Thanks to all who replied on group and via e-mail!....
--
Tony Sayer
#6
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#7
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On Fri, 26 May 2006 11:41:58 UTC, tony sayer <tony (AT) bancom (DOT) co.uk wrote: : Yes in fact further experimentation revealed that adding a cap across the coil : did indeed get it better. But in the original design thats not there is it?, : it seems that the ignition amplifier is just a simple semi conductor switch : that takes the output of the ECU and "amplifies" the switching pulse from : that.. I'm pretty sure there will be a big capacitor somewhere in the ignition amplifier. |
cheers
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Ian |
Tony Sayer
#8
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In article <cCUlhtvFIYkV-pn2-47rdoq11mzTG@localhost>, Ian Johnston ian.groups (AT) btinternet (DOT) com> writes On Fri, 26 May 2006 11:41:58 UTC, tony sayer <tony (AT) bancom (DOT) co.uk wrote: : Yes in fact further experimentation revealed that adding a cap across the coil : did indeed get it better. But in the original design thats not there is it?, : it seems that the ignition amplifier is just a simple semi conductor switch : that takes the output of the ECU and "amplifies" the switching pulse from : that.. I'm pretty sure there will be a big capacitor somewhere in the ignition amplifier. Can't be all that much as there seems sod all room in that unit! |
coil.
Tim..
#9
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"tony sayer" <tony (AT) bancom (DOT) co.uk> wrote in message news:b7IFAhAvs1dEFwSj (AT) bancom (DOT) co.uk... In article <cCUlhtvFIYkV-pn2-47rdoq11mzTG@localhost>, Ian Johnston ian.groups (AT) btinternet (DOT) com> writes On Fri, 26 May 2006 11:41:58 UTC, tony sayer <tony (AT) bancom (DOT) co.uk wrote: : Yes in fact further experimentation revealed that adding a cap across the coil : did indeed get it better. But in the original design thats not there is it?, : it seems that the ignition amplifier is just a simple semi conductor switch : that takes the output of the ECU and "amplifies" the switching pulse from : that.. I'm pretty sure there will be a big capacitor somewhere in the ignition amplifier. Can't be all that much as there seems sod all room in that unit! No, as the ECU performs the condensor-esque control of the LT side of the coil. Tim.. |
--
Tony Sayer
#10
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In article <w9Sdnescmbc6wurZnZ2dnUVZ8qadnZ2d (AT) bt (DOT) com>, Tim.. <the.farm.ha tes.spam (AT) btinternet (DOT) com> writes "tony sayer" <tony (AT) bancom (DOT) co.uk> wrote in message news:b7IFAhAvs1dEFwSj (AT) bancom (DOT) co.uk... In article <cCUlhtvFIYkV-pn2-47rdoq11mzTG@localhost>, Ian Johnston ian.groups (AT) btinternet (DOT) com> writes On Fri, 26 May 2006 11:41:58 UTC, tony sayer <tony (AT) bancom (DOT) co.uk wrote: : Yes in fact further experimentation revealed that adding a cap across the coil : did indeed get it better. But in the original design thats not there is it?, : it seems that the ignition amplifier is just a simple semi conductor switch : that takes the output of the ECU and "amplifies" the switching pulse from : that.. I'm pretty sure there will be a big capacitor somewhere in the ignition amplifier. Can't be all that much as there seems sod all room in that unit! No, as the ECU performs the condensor-esque control of the LT side of the coil. Tim.. Err right;!, when is the ECU anyway?... |
Under the scuttle panel, base of the windscreen passenger side. Be very sure
it is not cracked / damaged and replaced properly as I've known several die
from water ingress caused from broken / missing panel.
Tim..
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