GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: neil1780 on 07 February 2011, 18:37
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I've read through loads of threads but cant find the answer!
Think its an agg code , i got a new ignition module (coil) today but still no spark. Ive also changed relay 30 and all fuses and checked all earths but still nothing.
Is there anything else thats simple to check before i start changing sensors?
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immobilisor?
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it only has the standard vw one and from what ive read will still let the car start for a few seconds mate.
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Is there a spark coming from the coil? If not it's either:
a) the coil
b) ignition barrel
c) old, brittle, crap german wiring
Or d) the ECU
Or if like in my case all of the above!!
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Is there a spark coming from the coil? If not it's either:
a) the coil
b) ignition barrel
c) old, brittle, crap german wiring
Or d) the ECU
Or if like in my case all of the above!!
Changed coil and ignition switch today but still no spark. Ive looked at some more threads and read about the crank position sensor so i went out and checked mine just now and from what i can see, where thie wire enters the sensor it appears to be cracked and moves when wiggling the wire so i will get one tomorrow if dealer has one in stock.
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yea mate quite possible, on my car one of the wires from the ECU to the coil had literally been torn in half... thats what happens when a car with nearly 20 year old wires gets used day after day!
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Sounds like an immob problem.
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yea mate quite possible, on my car one of the wires from the ECU to the coil had literally been torn in half... thats what happens when a car with nearly 20 year old wires gets used day after day!
will check this tomorrow as well mate cheers as ive had a few issues with wiring the previous owner managed to melt the main live wire from the fuse box to the ignition dont know how he managed it had to replace the ignition to fuse box loom because of this, luckely the only other wires damaged were on the same loom.
Sounds like an immob problem.
how do i check this mate?
the reason im thinkin the crank sensor is the previos owner had the cutting out problem for a while before it stopped going.
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crank sensor ?
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crank sensor ?
crank positon sensor.
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I would plug it into vagcom before you do anything.
It'll tell you if the crank position sensor or any other sensors are failing.
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dont have one but will ask around.
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yeah thats the one its a possible mate.
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id say crank sensor, even if its not you need to replace it as the bare wires means it will fail soon if it hasnt already.
as you say if the factory immob was kicking in the car would fire for a couple of seconds then cut out.
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>It'll tell you if the crank position sensor or any other sensors are failing.
nah it won't the mk3 ecu doesn't appear to be that clever.
If the crank position sensor has broken wiring, then replace it. GSF for about £50 or dealer for about £200!!
James
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yeah the crank sensor diagnostics are a bit hit and miss, mine did tell me when mine was playing up though. problem is if its sending no signal at all the ecu will just think car isnt cranking over! luckily mine was just sending bad signals so ecu could tell and told me the readings were 'implausible'
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yeah the crank sensor diagnostics are a bit hit and miss, mine did tell me when mine was playing up though. problem is if its sending no signal at all the ecu will just think car isnt cranking over! luckily mine was just sending bad signals so ecu could tell and told me the readings were 'implausible'
Same thing with me. It's worth a shot plugging it into vagcom I guess! :smiley:
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I guess as always it depends on how-bad-it-is. as you say - no signal the car assumes no cranking, but a bad enough signal to cause rough running but not trip the ecu parameters is also possible. Later cars (more modern ECU's) are better at this I think.
J
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Got a price today £31 so it's not breaking the bank but none in stock so be in tomorrow.
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where are you getting it from, some are better than others! got mine for about that off ebay and it were crap, broken out of the box with the symptoms you describe. was not chuffed as it meant i couldn't get the car MOTed and had to walk to work while i waited for a replacement from a better supplier
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I am running the GSF one - and its works fine. beware cheap imitiations I guess.
J
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£25 + vat from local Partco cause I know manager. :smiley:
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as long as its a good make should be ok, mine was completly unbranded
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Changed crank sensor an still no spark! It's annoying me now! Where do the wires from the coil go to will need to check them tomorrow?
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my crank sensor was shot! bare wires,and inturn shorted out my ecu took me ages to work it out...but that was the problem :wink:
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Changed crank sensor an still no spark! It's annoying me now! Where do the wires from the coil go to will need to check them tomorrow?
yeah - check for battery voltage (> +12v) on pins 1 & 3 on the coil feed. Also check whilst cranking that 12v pulses seen between 2 & 3 on the feed. You'll need a test light and/or multimeter for this
James
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Cheers mate gonna check thes tonight got that info today.
my crank sensor was shot! bare wires,and inturn shorted out my ecu took me ages to work it out...but that was the problem :wink:
Did you half to replace ecu then?
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yes mate! one day my car just stopped it done my head in! i had no spark so replaced coil,dizzy,ripped out alarm and had it checked,replaced all plugs and leads and crank sensor which was in a bad way,turned out to be a earth fault on ecu due to crank sensor wires touching...when i plugged in vag com i got error message BATTERY + or something like that,basically ment no power to ecu...took me 3 months to find problem..some chap on here had a ecu with key(chip) imb,and ring leader for £75....plugged it all in and BINGO of she went :wink:
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Ok now it's running I have a new problem. When I start the car from cold it runs for about 20-30 mins then cuts out. If I try to start it again it cuts out straight away but if I leave it for 5 mins it starts but only runs for about 5 mins, the colder it is the longer it runs. The fuel pump struggled a bit yesterday then stopped and the car cut out, so I thought the relay was dodgy (is new from vw) so I pulled it out tonight and linked it out with wire so the pump was live and it still cut out and the pump stayed on.
Anyone help?
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ecu relay would be next on the list. does sound a lot like the new crank sensor is faulty, as this is exactly what my cheap ass new one did...
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Have done the relay mate unplugged thecrank sensor while running and its done the same thing so might just get another one and try it.