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melinx
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« Reply #25 on: April 20, 2007, 07:14:31 AM » |
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I think it is coming to the time for substituting the ECU ! the spark intensity is directly related to the speed that the coil primary current is switched off.
If the semiconductors in the ECU that control this have become leaky or aren't switching fast enough it will result in a weak spark.
It will be a bit ominous for everyone if this has occurred due to age though because I get the impression that the ECU is a pretty reliable piece of gear, unlike most of the other electronic systems on these cars.
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3000gsijim
3000 GSI 24V Auto
Jr. Member
Posts: 72
birmingham
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« Reply #26 on: April 20, 2007, 12:03:41 PM » |
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I think it is coming to the time for substituting the ECU ! the spark intensity is directly related to the speed that the coil primary current is switched off.
If the semiconductors in the ECU that control this have become leaky or aren't switching fast enough it will result in a weak spark.
It will be a bit ominous for everyone if this has occurred due to age though because I get the impression that the ECU is a pretty reliable piece of gear, unlike most of the other electronic systems on these cars.
i think you maybe right. problem is finding one local. i know there is one on ebay. |
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3000 GSI 24V Auto, dead..............., i`m in birmingham
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Dave the Builder
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« Reply #27 on: April 20, 2007, 01:17:30 PM » |
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remember the ecu is well protected behind a kick pannel so unless you have a leak and its got wet  it might NOT be that .or might be ...who knows  but the ecu and all other engine management components are connected together with looms , some engine flexing/movement over time could case harden(weaken ) these looms and cause an open circuit. only way to know is to meter the looms out and that could take a while hope this helps |
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If the above post contains spelling mistakes / grammatical errors / poor use of the quote function / a very weak retort, or is generally shyte; it's because I'm feked on a cocktail of drugs,homebrew and carb cleaner.sorry
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3000gsijim
3000 GSI 24V Auto
Jr. Member
Posts: 72
birmingham
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« Reply #28 on: April 20, 2007, 02:00:57 PM » |
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remember the ecu is well protected behind a kick pannel so unless you have a leak and its got wet it might NOT be that .or might be ...who knows but the ecu and all other engine management components are connected together with looms , some engine flexing/movement over time could case harden(weaken ) these looms and cause an open circuit. only way to know is to meter the looms out and that could take a while hope this helps bernard is popping over later, he has a plan.................. |
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3000 GSI 24V Auto, dead..............., i`m in birmingham
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von-opel
Full Member
Posts: 240
"Broadsword calling danny boy"
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« Reply #29 on: April 20, 2007, 05:48:51 PM » |
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One thing I thought of....the ECU gets its earth for the coil switching output stage from a specific point (it's not a general earth). Its one of the three brown wires that are earthed at the rear of the intake manifold bridge. Check these, if they're high resistance you'll get a low coil voltage. Also these three connections ultimately get they're earth from the engine main earthing braid. Check this.
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3000gsijim
3000 GSI 24V Auto
Jr. Member
Posts: 72
birmingham
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« Reply #30 on: April 20, 2007, 06:10:11 PM » |
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One thing I thought of....the ECU gets its earth for the coil switching output stage from a specific point (it's not a general earth). Its one of the three brown wires that are earthed at the rear of the intake manifold bridge. Check these, if they're high resistance you'll get a low coil voltage. Also these three connections ultimately get they're earth from the engine main earthing braid. Check this.
Will do and good thinking. Bernard is popping over tomorrow, we will see what comes of it. |
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3000 GSI 24V Auto, dead..............., i`m in birmingham
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Dave the Builder
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« Reply #31 on: April 20, 2007, 06:17:47 PM » |
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Top man that Bernard chap  |
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If the above post contains spelling mistakes / grammatical errors / poor use of the quote function / a very weak retort, or is generally shyte; it's because I'm feked on a cocktail of drugs,homebrew and carb cleaner.sorry
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GMC
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« Reply #32 on: April 20, 2007, 06:31:06 PM » |
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Does the car turm over?
Does the car turn over quicker than normal?
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3000gsijim
3000 GSI 24V Auto
Jr. Member
Posts: 72
birmingham
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« Reply #33 on: April 20, 2007, 08:14:25 PM » |
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Does the car turm over?
Does the car turn over quicker than normal?
nah, i know what your thinking and the chains are good |
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3000 GSI 24V Auto, dead..............., i`m in birmingham
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Pedro
I'M A FILTHY TORY!
Global Moderator
Wanted: Life
Posts: 6605
Location: York
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« Reply #34 on: April 20, 2007, 09:35:42 PM » |
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I think Mr, GMC is thinking of the dreaded "borewash" syndrome.
Nasty business.............
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Do you know what "Nemesis" means? A righteous infliction of retribution manifested by an appropriate agent. Personified in this case by an 'orrible c*nt... me.
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3000gsijim
3000 GSI 24V Auto
Jr. Member
Posts: 72
birmingham
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« Reply #35 on: May 04, 2007, 09:19:48 PM » |
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3000 GSI 24V Auto, dead..............., i`m in birmingham
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #36 on: May 04, 2007, 09:31:20 PM » |
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who wants to look at my poor starting 12v ? |
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3000gsijim
3000 GSI 24V Auto
Jr. Member
Posts: 72
birmingham
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« Reply #37 on: May 04, 2007, 09:32:52 PM » |
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who wants to look at my poor starting 12v ? symptoms?? |
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3000 GSI 24V Auto, dead..............., i`m in birmingham
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A3LTR
No longer single and lovin it !
Sr. Member
Posts: 489
IF ALL ELSE FAILS - HIT IT!!
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« Reply #38 on: May 04, 2007, 09:35:17 PM » |
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Tetleysmooth
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« Reply #39 on: May 05, 2007, 08:00:57 AM » |
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This is a really long shot, but that sounds like the fuel vapourising, same as the old Rover V8's used to do.
Are any of your fuel supply lines close to the exhaust manifold?
Try re-routing the fuel lines.
Like I said, it's a long shot.
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Nils desparandum illegitimi carborundum.
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Pedro
I'M A FILTHY TORY!
Global Moderator
Wanted: Life
Posts: 6605
Location: York
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« Reply #40 on: May 05, 2007, 08:24:53 AM » |
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This is a really long shot, but that sounds like the fuel vapourising, same as the old Rover V8's used to do.
Are any of your fuel supply lines close to the exhaust manifold?
Try re-routing the fuel lines.
Like I said, it's a long shot.
My brother's SD1 used to do that, especially when it was getting low on petrol. Had to pour petrol down the Strombergs!  |
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Do you know what "Nemesis" means? A righteous infliction of retribution manifested by an appropriate agent. Personified in this case by an 'orrible c*nt... me.
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Scatmancraig
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« Reply #41 on: May 05, 2007, 10:08:25 AM » |
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Only happy to help! At least you got a spare dizzy now too!! |
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Bernard
Jr. Member
Posts: 98
Diplomat 2.0 92 Frost Blue Mk2 Carlton 2.0 86
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« Reply #42 on: May 12, 2007, 11:40:31 PM » |
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Nothing gives you a oooooooh like a Good old Vauxhall does !
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3000gsijim
3000 GSI 24V Auto
Jr. Member
Posts: 72
birmingham
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« Reply #43 on: May 13, 2007, 02:05:43 PM » |
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many thanks bernard... |
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3000 GSI 24V Auto, dead..............., i`m in birmingham
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