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n2wheelies
Samba Member
Joined: May 31, 2006
Posts: 88
Location: newport beach, ca
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 Posted: Tue Dec 12, 2017 11:30 am Post subject: Couple pictures of Digifant ECU - my hunting idle culprit |
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hello, been fighting a hunting idle and part throttle oscillation like throttle snatch for EVER, its found, my buddy loaned me an ECU. I have tried everything else. a few photos of found cold solder joiint, not sure if this resister is suspect, going to fix the solder joints first and try it out
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'87 Vanagon Weekender 'ELNINYO'
past vw's...
'09 Jetta Sportwagen 'Pearl'
'60 Deluxe Beetle
'09 EOS 'petal'
'78 scirocco
'66 T2 panel dead tour vehicle, 'mr bus'
'67 13 window
'95 eurocamper 'charlie' (phish tour vehicle)
'03 Mk4 TDI 'steve'
'04 W8 Phaeton 'david' |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 5974
Location: Bemidji, MN
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| Posted: Tue Dec 12, 2017 11:44 am Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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classic. the resistor should still be good. i'd measure the value, order one of a higher wattage that will still fit, and then solder it back in the standoffs but with longer leads so the resistor heat can dissapate a bit before hitting the PCB. won't take much length. that PCB can be cleaned up after the posts are removed.
you can 'rebuild' the entire ECU by attacking that resistor, shot gunning all the electrolytic caps, and reflowing each solder joint.
a tool like this is incredibly wonderful for desoldering components:
https://www.hakko.com/english/products/hakko_fr300.html
-dan |
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n2wheelies
Samba Member
Joined: May 31, 2006
Posts: 88
Location: newport beach, ca
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| Posted: Tue Dec 12, 2017 12:54 pm Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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resoldered the suspect connections, no change 
_________________
'87 Vanagon Weekender 'ELNINYO'
past vw's...
'09 Jetta Sportwagen 'Pearl'
'60 Deluxe Beetle
'09 EOS 'petal'
'78 scirocco
'66 T2 panel dead tour vehicle, 'mr bus'
'67 13 window
'95 eurocamper 'charlie' (phish tour vehicle)
'03 Mk4 TDI 'steve'
'04 W8 Phaeton 'david' |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 5974
Location: Bemidji, MN
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| Posted: Tue Dec 12, 2017 2:37 pm Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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the capacitor next to the resistor is also bad... electrolyte oozing out from under the top cap. it is next to the very hot resistor so that makes sense that it has failed too.
were it mine, i'd replace ALL electrolytic caps. source them from Digikey.
-dan |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 5974
Location: Bemidji, MN
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| Posted: Tue Dec 12, 2017 2:40 pm Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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the capacitor next to the resistor is also bad... electrolyte oozing out from under the top cap. it is next to the very hot resistor so that makes sense that it has failed too.
were it mine, i'd replace ALL electrolytic caps. source them from Digikey.
-dan |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32987
Location: Reading Pennsylvania
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n2wheelies
Samba Member
Joined: May 31, 2006
Posts: 88
Location: newport beach, ca
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| Posted: Tue Dec 12, 2017 3:30 pm Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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ive already gone the go westy route... thanks for the reply. i may try to fix it in the meantime as I have a loaner ecu. how do I determine the resistance of that suspect resistor since you said 'too'?
_________________
'87 Vanagon Weekender 'ELNINYO'
past vw's...
'09 Jetta Sportwagen 'Pearl'
'60 Deluxe Beetle
'09 EOS 'petal'
'78 scirocco
'66 T2 panel dead tour vehicle, 'mr bus'
'67 13 window
'95 eurocamper 'charlie' (phish tour vehicle)
'03 Mk4 TDI 'steve'
'04 W8 Phaeton 'david' |
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| Back to top |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 5974
Location: Bemidji, MN
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| Posted: Tue Dec 12, 2017 6:24 pm Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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my 'too' failure reference regarded the PCB/solder melt at the resistor. but since the markings are burned off the resistor, it should be swapped out. you'll have to unhook one end and then measure the resistance with an ohm meter. no way to check it in circuit.
-dan |
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n2wheelies
Samba Member
Joined: May 31, 2006
Posts: 88
Location: newport beach, ca
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| Posted: Thu Dec 21, 2017 12:21 pm Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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go westy unit arrived. ran fine around town, but fails after 30 minutes of freeway driving. hope they have the resources to 'test' that on return, having a tech drive 60 miles to 'confirm' its faulty.
_________________
'87 Vanagon Weekender 'ELNINYO'
past vw's...
'09 Jetta Sportwagen 'Pearl'
'60 Deluxe Beetle
'09 EOS 'petal'
'78 scirocco
'66 T2 panel dead tour vehicle, 'mr bus'
'67 13 window
'95 eurocamper 'charlie' (phish tour vehicle)
'03 Mk4 TDI 'steve'
'04 W8 Phaeton 'david' |
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| Back to top |
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fortheloveofvdub
Samba Member
Joined: September 21, 2007
Posts: 140
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| Posted: Thu Apr 19, 2018 9:30 am Post subject: Re: couple picture of digifant - the ECU was my hunting idle culprit |
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| What were your symptoms please? |
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