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DevonGSi
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« on: November 04, 2010, 10:28:08 AM » |
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My GSi let me down the other day. Called out Mr RAC and he gave here a good look over and connected a bulb to one of the injector power connectors and told me it was a weak signal...
Why would this be?
The alternator was charging fine.
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There are 10 types of people in this world. Those who understand binary and those who dont.
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carlton_mad
3.0 CDX and now Diamond 3.0 24v
Administrator
Wanted: Life
Posts: 5216
dartford kent
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« Reply #1 on: November 04, 2010, 05:57:28 PM » |
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have you got a spare ecu??
if so give it a try che
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what would life be like if we all drove fwd cars? feckin boring that's what rear drive or bust
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DevonGSi
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« Reply #2 on: November 04, 2010, 06:05:48 PM » |
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have you got a spare ecu??
if so give it a try che
Will do Chris! |
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There are 10 types of people in this world. Those who understand binary and those who dont.
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melinx
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« Reply #3 on: November 04, 2010, 08:07:44 PM » |
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Make sure that there is no corrosion on the ECU connector while you have it disconnected.
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24vman
Mini's and Carltons
Hero Member
Posts: 724
Battle, East Sussex
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« Reply #4 on: November 04, 2010, 08:34:46 PM » |
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have you got a spare ecu??
if so give it a try che
If you haven't got a spare, I have one or two you could borrow. |
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1988 GSI 12v, 1991 GSI 24v, 1993 Diamond 4.0 24v, Lotus Senator
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chris
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« Reply #5 on: November 04, 2010, 10:47:34 PM » |
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If I remember correctly from many years ago when I had a failed ECU and investigated the injector supplies -
The injectors should have a ignition +ve supply, easy to check with a meter down to earth, and the other wire is earthed by the ECU for whatever time the ECU decides for the injection pulse.
I guess this means that as well as having a good 12v supply and a working ECU a good earth via the ECU would be the other important thing.
I would check all earths as I dont know where the ECU eventually earths, if its anything like the dash itll be miles away like the body beside the battery, on the other hand also check the ones on the engine and engine to body strap.
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DevonGSi
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« Reply #6 on: November 05, 2010, 08:55:21 AM » |
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have you got a spare ecu??
if so give it a try che
If you haven't got a spare, I have one or two you could borrow. Thanks for the offer. Luckily I do have a spare...but I dont have a bulb to plug in to the injector... |
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There are 10 types of people in this world. Those who understand binary and those who dont.
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DevonGSi
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« Reply #7 on: November 05, 2010, 08:56:41 AM » |
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If I remember correctly from many years ago when I had a failed ECU and investigated the injector supplies -
The injectors should have a ignition +ve supply, easy to check with a meter down to earth, and the other wire is earthed by the ECU for whatever time the ECU decides for the injection pulse.
I guess this means that as well as having a good 12v supply and a working ECU a good earth via the ECU would be the other important thing.
I would check all earths as I dont know where the ECU eventually earths, if its anything like the dash itll be miles away like the body beside the battery, on the other hand also check the ones on the engine and engine to body strap.
All good advice and once my new daughter lets me have an hour or two I will do that! |
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There are 10 types of people in this world. Those who understand binary and those who dont.
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von-opel
Full Member
Posts: 240
"Broadsword calling danny boy"
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« Reply #8 on: November 05, 2010, 04:42:45 PM » |
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I guess this means that as well as having a good 12v supply and a working ECU a good earth via the ECU would be the other important thing.
I would check all earths as I dont know where the ECU eventually earths, if its anything like the dash itll be miles away like the body beside the battery, on the other hand also check the ones on the engine and engine to body strap.
The ECU gets the majority of it's earths from the back of the manifold. Check these connections (i.e. remove the bolts & clean the mating surfaces). You'll see 3 large black wires going to bolts on the manifold.....they're the ones. |
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chris
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« Reply #9 on: November 06, 2010, 12:15:17 AM » |
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I guess this means that as well as having a good 12v supply and a working ECU a good earth via the ECU would be the other important thing.
I would check all earths as I dont know where the ECU eventually earths, if its anything like the dash itll be miles away like the body beside the battery, on the other hand also check the ones on the engine and engine to body strap.
The ECU gets the majority of it's earths from the back of the manifold. Check these connections (i.e. remove the bolts & clean the mating surfaces). You'll see 3 large black wires going to bolts on the manifold.....they're the ones. Good info for reference thanks. Thats what I was trying to say by "the ones on the engine", and since the earths are on there, the engine to body earth is important too. I cant say that I know where that is located mind, can you advise please Von Opel, cheers |
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DevonGSi
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« Reply #10 on: November 06, 2010, 01:33:52 PM » |
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I have already added another earth from the battery to the engine, so that should be good.
WIll clean the other earths and report back.
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There are 10 types of people in this world. Those who understand binary and those who dont.
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DevonGSi
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« Reply #11 on: November 07, 2010, 08:32:32 PM » |
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Cleaned the earths on the manifold. Jeezus. Its like a new car! No really!
The 4000rpm kick that I have written about going missing is back too....odd.
But im a happy chappy!
DevonGSI
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There are 10 types of people in this world. Those who understand binary and those who dont.
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von-opel
Full Member
Posts: 240
"Broadsword calling danny boy"
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« Reply #12 on: November 08, 2010, 05:43:28 PM » |
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It's often these earths as the ECU relies on them to pulse the injectors. Way back when I was working on these cars (early 90's) GM sent round a service instruction regarding these to be checked at service intervals.
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melinx
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« Reply #13 on: November 09, 2010, 09:36:40 AM » |
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von-opel
Full Member
Posts: 240
"Broadsword calling danny boy"
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« Reply #14 on: November 09, 2010, 09:20:20 PM » |
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FYI these earths supply: 1) Injectors
2) Ignition Coil
3) Oxygen Sensor (Lambda)
4) ECU 'Chip' Ground
All the above is via the ECU, it has no other source of battery neg (ground)
so you can appreciate how important a clean/sound contact is for the correct operation of the engine. Moral is..... when things go wrong, check these first & to eliminate any problems they might be causing.
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chris
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« Reply #15 on: November 09, 2010, 11:40:12 PM » |
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Worth adding to the list of jobs for the annual service maybe and prevent the problems.
Clean up, bit of vaseline on and refit.
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