GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Nathan... on 05 July 2012, 11:07
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Hi guys, I'm in need.
My digifant 1.8 8v GTI won't start. When I bought it it didn't start, but got it firing with the aid of the AA. It wouldn't hold a charge but the Alternator is fine according to the AA dude.
The car turns over but doesn't fire. I have no spark at all.
I have replaced the Coil, HT Leads, Distributor Cap, Rotor Arm, and still I have nothing. Is it likely its the digifant ECU? I have a voltage of 8.5v on the plug above the digifant ECU, but nothing at the coil. Its really pissing me off lol.
Thanks
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bump :sad:
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Has the dizzy been taken out and put back in a different position?
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No mate, didn't take the dizzy out, just replaced the rotor arm and cap
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Put back the old parts, then come back to us :wink:
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Put back the old parts, then come back to us :wink:
the Old parts were utterly shagged mate, no chance they're going back on. It started once the new dizzy cap and rotor arm were fitted, since then has had a new battery and coil, leads and plugs.
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Do you get a spark from the king lead?
The one in the middle of the dizzy cap.
Plus are you taking one spark plug out at a time and seeing an arc on the head?
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Do you get a spark from the king lead?
The one in the middle of the dizzy cap.
Plus are you taking one spark plug out at a time and seeing an arc on the head?
Do I take the king lead from the dizzy end to find out if it get a spark?
Have taken lead 1, furthest from gearbox and have no spark whatsoever. Not tried the others..
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Dizzy to coil so take off the coil end for testing.
Take one lead off grip using insulated grips then go close to the head so if it arcs blue spark.
Check coil for voltages as well!
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ok so i take the end off the coil and hold that to a set of insulated pliers and see if there is a spark? sounds f**king dangerous to me but ill give it a go! haha :grin:
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It should spark no matter that position the dizzy is in.
IIRC a spark plug lead on the coil with a spark plug attached should do the trick. Not a fan of electric shock!
Also replace that battery if it doesnt hold charge. Saves messing around with the jump leads. Worth checking all the engine bay earths also.
My bet is on the distributor.
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ok so i take the end off the coil and hold that to a set of insulated pliers and see if there is a spark? sounds f**king dangerous to me but ill give it a go! haha :grin:
Nah in the old days we always tell newbies to hold a dodgy lead, once they got a shock we knew the lead was finished :evil:
Yeah spark plug should be on the end aswell so wasnt clear sometimes I assume people know what they are doing :grin: :laugh:
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right i've done a few spot checks:
Voltage at the battery is 12.4v.
Voltage at the coil with ignition on is 12.4v
Voltage at the coil when the engine is turned over drops to 8.7v.
Voltage at the igntion module (on top of digifant ECU) is 12v when ignition is on.
I removed the king lead from the dizzy cap, put a spark plug in there and still get no spark when the engine is turned over. the rotor arm hasn't been moved from its original location so it should still be at no.1 at TDC.
I am thinking it has something to do with the immobiliser/alarm circuit?!
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I would think if you have voltage at the coil and the engine turns over it wouldn't be immobiliser.
I had a problem similar to this recently and it turned out to be a duff battery. The voltage at the coil dropped to 7v in my case and the spark, when I got one, was yellow and as weak as piss. In the old days a 6 volt coil was fitted with a dropper resistance in series which was shorted when the starter was opperated to effectively put 12 volts onto a 6 volt coil.
I don't know if the digi has this, I bloody well should know, as I've had these now for 21 years. I suspect not, but someone on here will surely know.
Anyway, good luck with it, as I know, it can be a ball ache.
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I would think if you have voltage at the coil and the engine turns over it wouldn't be immobiliser.
I had a problem similar to this recently and it turned out to be a duff battery. The voltage at the coil dropped to 7v in my case and the spark, when I got one, was yellow and as weak as piss. In the old days a 6 volt coil was fitted with a dropper resistance in series which was shorted when the starter was opperated to effectively put 12 volts onto a 6 volt coil.
I don't know if the digi has this, I bloody well should know, as I've had these now for 21 years. I suspect not, but someone on here will surely know.
Anyway, good luck with it, as I know, it can be a ball ache.
Cheers for that, another evanue to go down :cry: I just have a feeling that there is a dual immobiliser system, its got a gemini Aquila alarm/immobiliser.
My battery is brand new, as is the coil, leads, plugs and its had a replacement digifant ECU as well