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Author Topic: what have i done?  (Read 4400 times)

Offline weazgti

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Re: what have i done?
« Reply #30 on: 04 January 2010, 12:59 »
Right. Have checked for continuity on the tci plug and all but one of the pi.ns buzz my multimeter when touching the battery earth.
Im not getting sparking recently and have been able to drive the car but it still has the huge flatspot its had for ages which is worse when something is turned on in the car. Yesterday morning i went to pull away and it stalled then wouldnt start so i wiggled the ecu and it run spot on for one trip really pulling well then it went back to normal again, gutless with a huge flatspot.
I dug out an old tci but its a 16v one.Would this work on this or is the ecu looking suspect still?

edit: just been out driving and while i was waiting for somebody i thought id have a look at the ecu relay. Pulled it out,wiped the contacts and put it back in and after a while all was well again on the drive home. Either pure coincedence or water in the fusebox connections maybe?
« Last Edit: 04 January 2010, 15:54 by weazgti »
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Offline DAVEMARX

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Re: what have i done?
« Reply #31 on: 04 January 2010, 17:56 »
Unplugging the battery is a no brainer when fookin about with electrics only a div would leave it connected 'no offence'  :evil:

unplugging the battery for half hour should reset the ecu.

What you've done is leave it live hangin over the arch its then contacted mental and you've burnt something out.

ALWAYS ALWAYS ALWAYS disconnect the battery when playing with electrics regaurdless if it says to or not i mean  if your electric cooker wasnt working right would you start mucking around with it poking a screw driver in there while it was still plugged in

Bonkers!!!  i reckon a new ecu will shortly be on the way.
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Offline weazgti

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Re: what have i done?
« Reply #32 on: 04 January 2010, 20:01 »
The ecu shouldnt be live anyway.What you say doesnt make sense because what would it matter if it touched the arch? its sitting in the scuttle which is metal.
The reason i was playing about with electrics in the first place was to try and find out what was wrong before i even touched it.
If its back to running the same as before then i cant see how i have burnt anything out.
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Offline DAVEMARX

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Re: what have i done?
« Reply #33 on: 04 January 2010, 20:16 »
Quote from: weazgti on 04 January 2010, 20:01
The ecu shouldnt be live anyway.What you say doesnt make sense because what would it matter if it touched the arch? its sitting in the scuttle which is metal.
The reason i was playing about with electrics in the first place was to try and find out what was wrong before i even touched it.
If its back to running the same as before then i cant see how i have burnt anything out.

Ecu shouldnt be live anway 'what' its friggin electric with wires coming out of it even unplugged its still earthed to the car.

if the car is back to normal then no you havent burnt anything out but pulling out plugs or what ever you done obviously upset the ecu for 1 reason and 1 reason only. coz you didnt disconnect the  battery

its the mother of all f**k ups i know this coz ive made the mistake myself and coursed magor headaches
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Offline rubjonny

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Re: what have i done?
« Reply #34 on: 05 January 2010, 10:50 »
you shouldnt need to pull the battery for this kind of thing, but you never know what faults are in the wiring which will cause things liek this to happen!  also pulling the ecu or battery for any length of time wont reset the digifant ecu as they have no memory.

the fact all but of the TCI piuns buzz continuity to earth is a problem, you defiitly have some wiring gremlins in your car!  check over the loom in the engine bay very carefully, you're looking for any damaged areas or bits that have electrical tape on. I always home in on electrical tape, 9 times out of 10 when you unwrap it you'll uncover something horrible  :grin:
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Offline weazgti

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Re: what have i done?
« Reply #35 on: 05 January 2010, 19:56 »
ok i need to investigate then. It has the remains of an alarm in there possibly immobiliser, aswell no box just wires. I disconnected the live for the alarm and lost all electrics so had to stick it back on for the time being,it just has a bag over the wires coming out the bulkhead.
Dont know if this is related but i will follow the wires and see whats tapped in where.
Not too clued up on alarm/immobilisers, would it be tapped into tci wiring at all?
oh and thanks for advice, i was considering shotgun diagnostics and just replacing ecu for the sake of it. :grin:
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Offline rubjonny

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Re: what have i done?
« Reply #36 on: 11 January 2010, 09:12 »
could well be, on my gti the TCI ign live feed had been tapped into by a previous alarm install.

removing alarm is pretty straight forward, find the brain then follow all the nwiring from it. if you find any wires that have been chopped and spliced into, find the other end of the wire and rejoin.
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Offline weazgti

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Re: what have i done?
« Reply #37 on: 11 January 2010, 10:42 »
Have had a nose about and although there are no wires chopped/spliced in the engine bay there are a lot of snap on connecters under the steering cowling and little plugs near the fusebox.
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