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Model specific boards => Golf mk3 => Topic started by: lectrotek on 16 December 2014, 20:41
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Hi Guys,
So I get my valver back from the menders after getting a brake hose sorted and they report this misfire.
I've known this for ages and have done a few things to try and sort it out but no joy.
Have tried: New plugs/leads + service etc
Mechanic mentioned it might be an injection problem/fuel filter.
Has anyone had a similar problem? At my wits' end trying to figure it out :undecided:
Cheers.
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Hi there, this is my first message to this forum. I was checking answers around the world about it.
Im from Turkey, and i have a problem like yours.
My car also shakes when the rpm reaches between 2,400-3,400rpm
Connected to a computer, checked every sockets and plugs and could not find anything, and my reapirman said, we have to change distributor it must be about ignition.
Have you solved the problem ?
this is mine. 16v ABF
https://scontent-b-lhr.xx.fbcdn.net/hphotos-xpf1/v/t1.0-9/s720x720/10711102_10154837971855441_2637193784406651262_n.jpg?oh=53635affd264c0185e95383e2b882c62&oe=550CD486
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Any fault codes?
If there aren't try a log drive....
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First rule of Mk3's swap the coil over if it misses or conks out and does not throw a fault code.
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Yeh no fault codes
Cheers Bush, this is interesting...Any particular specification of coil u recommend?
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Any particular specification of coil u recommend?
If you can find one - Beru are the OEM manufacturer.
Personally I would say there are lots of things to look into on an ABF before the coil -
Try cleaning throttle body & ISV
Check the condition of the wiring going to the throttle body -its location above the exhaust manifold bakes the insulation causing shorts.
Carefully check over the small vacuum hose for leaks -best just to replace with silicone
Lastly have a good look at the crank sensor the insulation on the cable likes to go brittle - even the sensor body can go brittle too.
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LR5V, thanks for that. proper food for thought
All these things difficult to do? I imagine coil + throttle body aren't too tricky...any pitfalls for a novice?
Tim
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coil is very easy, 2 screws.
TB a bit more difficult, you may have to take it off to clean it (and then likely need a new gasket)
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I thought the TB was just a case of disconnecting the air inlet, spraying carb cleaner and wiping the gunk out...that isn't likely to damage the gasket is it?
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Yes pretty much is but I would take it off and clean it outside....
I have used brake cleaner in the past and some lint free tissues
Gasket is p/n 037129748 and it's not too expensive
(http://www.vagcat.com/p/B121/133260.png)
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Great pic. Thanks for that.
ISV is for idle problems, right? Will cleaning it do anything to solve ignition at 2000-3000rpm?
Also, where is the ISV on that diagram?
Cheers guys.
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ISV can also cause running issue but not too much (air flow through is fairly restricted)
ISV is part 1:
(http://www.vagcat.com/p/B121/133060.png)
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Thanks again Itava. :smiley:
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Might even have a coil you can have if you can get to Epsom, think 8v uses the same part.....
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Does the misfire occur randomly or is it there all the while? If you have the chance I would hook up to VCDS and look at the live readings if possible.
However, I used to have a misfire that would occur randomly and it generally used to happen when cruising around 2500 - 3000rpm (that was most of my route driving between those values) and I sought advise and changed the ECU relay. That seemed to do the trick, no misfire issues ever since.
Some people have reported issues with the fuel pump relay causing similar. But to prevent unnecessary spending, check the basics first and swap components over from known working vehicles if you can.
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Second and third rule, have a spare ecu and pump relay with your coil.
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All these things difficult to do? I imagine coil + throttle body aren't too tricky...any pitfalls for a novice?
Apologies for not getting back to you sooner, seems you have been looked after
-All those fixes are pretty easy to do, most intense would be repairing the loom soldering in new cables.
Second and third rule, have a spare ecu and pump relay with your coil.
Yes relays are a good one too, the solder joints dry out and crack
iirc the ECU one can be easily re-soldered, fuel pump may be the same.
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Thanks guys.
Update: Fitted new coil....Engine started
Took the distributor cap off to give a clean but was clean as a whistle. Put back on.
Went to test the coil out on the road...engine wouldn't start. Wouldn't even try and tick over. Tried to bump start. no joy.
I think it's the scorpion immobiliser that's f*cked. won't disengage. so pissed off.
Next question...Was the scorpion alarm standard spec with the later 16v? Trying to figure out what it takes to disable the immobiliser.
I love this car, but it's doing my head in!
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Not sure if it was standard or a dealer fit option. Mine used to/has remains of the Scorpion alarm. Don't forget that the vehicle is likely to have a factory immobiliser anyway.
What makes you feel as though it's the Scorpion?
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update...
bypassed the immobiliser. still sketchy. will start 50% of time today. looks like starter motor is knackered or something. b*llocks!
Ah well. At least it's got a lovely, sparkly new coil
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Change your relays, at £10 each you now know (with the coil) that three of the four usual suspects are good. In my experience most Mk3 faults like this are related to the above or with a faulty crank sensor.
If they are all good then you can then go through injectors one at a time with a good unit etc, knowing your foundations are good is key in fault finding.
If it turns out to be a loose wire on the combobulator, then you have coil and relays for testing at a later date.
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Cheers Bush,
knowing your foundations are good is key in fault finding.
Amen to this. Know the relays are ok because the solanoid is clicking. Problem is either that the current is either not getting to the starter motor from the solanoid, or the starter motor is knackered.
Called up my local autofactors and they say there are two types of motor for the 16v. 2-bolt and 3-bolt.
now need to figure out which one of these i need and try and get hold of one over the holidays. won't be easy i reckon.