(nbr) vw passat 2.0 petrol running on 3

[hmmmnz]

hey kids,
well i have a bog standard b5.5 2.0l petrol passat estate,
the mrs came home the other day and said it was shuddering,
so i went out and checked it, sure enough,
plugged it in to the pc via the vag.com cable and popped a 16687 fault code which is

[TheCatSatOnTh...]

I am anything but a mechanic, but if you know you have a spark, you're left with air (statistically diminishing unlikely issue) and fuel.

Our (diesel) Passat is on it's second replacement injector at 170k, so for us it's not unheard of.

[Nb]

Engine code? Ive done a lot of coil packs on b5 passats on the 20valve engine.
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Cbr1100xx blackbird gone, mk4 golf gt tdi chav now
Colin1 wrote 'Im grateful for what i can get, which isnt all that much.'
Columbus travel insurance are crap!! Do not use!

[hmmmnz]

its the sohc azm engine
bog standard 8valve engine, yeah feel the power

the coil pack is hidden away in the stupidest place near the back of the motor under the intake
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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Aff]

Vacuum leak?

Get a-sprayin' with the carb cleaner.
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Current Bikes:Honda 929RR Fireblade, Honda CD200 Benly (Project), Stomp Z2 140
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[Nb]

The old square coil pack with the big heat sink in the middle, i remember those. Can you swap a ht lead round to eliminate a lead? Ive had cars where you can see a spark outside of the cylinder but its not good enough when under pressure.
____________________
Cbr1100xx blackbird gone, mk4 golf gt tdi chav now
Colin1 wrote 'Im grateful for what i can get, which isnt all that much.'
Columbus travel insurance are crap!! Do not use!

[hmmmnz]

[Nb]

I would of thought with a split breather hose you would have another code other than misfire. But always worth a spray around the intake i suppose.
____________________
Cbr1100xx blackbird gone, mk4 golf gt tdi chav now
Colin1 wrote 'Im grateful for what i can get, which isnt all that much.'
Columbus travel insurance are crap!! Do not use!

[hmmmnz]

yeah i know, nothing makes sense,
i did have another error code that said my maf sensor was reading to high??
both things have said check vacuum lines,
so i guess its plausible, how it effects only the 3rd cylinder is frankly beyond me
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Nb]

[hmmmnz]

right i think i cracked it,
i thought since its a wasted spark system, it would fire on both 2 and 3 at the same time,
so swapped lead 2 on to plug 3, and if still was running on 3 cylinders then it was going to be lead related,
if it started running on 2 cylinders then it was not, and was definite issue with cylinder 3 by itself,

what do you know it ran the same, (cylinder 2 was now dead, but cylinder 3 was running fine) also noticed that the metal surround of the lead was sparking on the rocker cover, hmmmm
i pulled the cover off and tried again, and spied this
https://i58.photobucket.com/albums/g257/hmmmnz/IMAG1154Medium_zps6deb81d5.jpg
you may not be able to see it, but in the center of the plug top there is a pin prick and a spark is escaping and earthing itself, thus taking the easiest way home rather than through the spark plug,

ive wrapped it insulation tape popped it on cylinder 3, started the car,.... ran perfectly
so there you go, f*cken metal surrounded plug ends, dumb sh*t,

mucho thanks, ill keep ya posted on any developments
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Nb]

Glad you got it sorted, if you do replace the leads get a high quality set or even genuine so you wont have to be struggling for a while to change them again.
Try here for genuine stuff https://www.thetradepartsspecialists.co.uk/
____________________
Cbr1100xx blackbird gone, mk4 golf gt tdi chav now
Colin1 wrote 'Im grateful for what i can get, which isnt all that much.'
Columbus travel insurance are crap!! Do not use!

[raesewell]

Post this on Passat forum
This is a bike forum
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Yamaha FJR 1300 Normanton West Yorkshire

[hmmmnz]