All Things Mk5 > How to Guides / Troubleshooting

P0304 Misfire problems

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Ash_89:
Morning guys

recently noticed a misfire on my car noticeably worse when cold starting
the only code im getting on my reader (not vag com) is the P0304 misfire cylinder 4

my injectors where cleaned/serviced last October also new BKR7EIX plugs fitted at the same time , and walnut carbon clean

bits i have tried
swap coil pack and spark from cylinder 1-4 yesterday
replaced pcv pipe (going to inlet) as was slightly leaking
fuel filter changed 1/08/20
r8 coil packs around a year old
the car runs fine whilst driving boosts as normal its only on idle i get the misfire .

engine code BWJ
75K miles



[/url[url=https://www.flickr.com/photos/158705908@N03/]

CYLINDER 4 PLUG

Ash_89:
Compression test was done last night

cylinder 1  182 psi
cylinder 2  178 psi
cylinder 3  187 psi
cylinder 4  187 psi

will be doing another this weekend with a leak down test aswell due to me using a fair bit of oil

mjmallia:
When was the cam chain and tensioner changed?

Had a similar problem recently with a cold misfire and had a little chain rattle. The chain and tensioner were changed recently, but one of the three cam plate seals was broken and not producing enough oil pressure at idle.......so the chain was slack and created the misfires.

Ash_89:

--- Quote from: mjmallia on September 03, 2020, 03:21:54 pm ---When was the cam chain and tensioner changed?

Had a similar problem recently with a cold misfire and had a little chain rattle. The chain and tensioner were changed recently, but one of the three cam plate seals was broken and not producing enough oil pressure at idle.......so the chain was slack and created the misfires.

--- End quote ---

Not had the cam chain replaced mate just the cambelt last year , was yours only missing on one cylinder ?
my car does sometimes have a rattle when starting but it goes in a second

mjmallia:
It did to begin with then spread out on three cylinders.

The cam chain does need checking and they can start to fail from as early as 60K miles, but between 80K-100K they are usually due these days.

I don't get any rattle at start up on mine

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