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2017 Golf R mk7 misfire cylinder 1


JDvanb

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So I've been having a misfire code for sometime now started on cold starts would throw a code and sometimes would even hide cylinders the misfire use to be in more then one cylinder but I had the top of my block resealed and that got rid of the misfires in other cylinders now it's remains in the first cylinder I have spent dumb money getting it diagnosed I've done all new coils spark plugs,injectors and walnut blast, software update from vw and the issue still persists but now it seems to be misfiring not on cold start but after I drive to the back of my garage shut it off for a few minutes and then back on I'm getting hundreds of fish bites in this one cylinder and a code that sometimes turns to a cel or flashing cel. I don't appear to be burning oil. I am absolutely stumped I've been trying to get it fixed before winter but I'm out of ideas and pretty much money lol anyone have any ideas ? It drives completely fine but I'm worried in the winter it's gonna be hiding the cylinder and I won't be able to get it warm enough to clear it and drive off 

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@TechieAlijust the cylinder one misfire code shows and sometimes I get 02 sensor lean but it's been replaced also. I'm doing a compression test on Friday I'm literally ready to sell it but I love it so much it absolutely breaks my heart so I appreciate the reply . What does changing the cam magnet do ? I'll do a little research rn @gregozedobeI was thinking something like that . Again thank you guys this is my dream car but I'm already looking at trucks cause I need a reliable vehicle for our negative 30 temps in Canada. 

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39 minutes ago, JDvanb said:

@OpelCalibraBoss p030100 is the code and it's the only cylinder. And like I said everything has been done practically. Unfortunately everything you've brought up has been repaired or tested. I'm honestly grasping at straws now. When you say solenoid what is that ? Like cam magnet ? Cause that's what Im thinking now 

If its cam magnet or the valve inside the camshaft you'd normally see cam timing errors reported. And misfires would be unlikely to be on one cylinder only. It would be all cyl or atleast move around. But probably just drive worse, maybe run a little rough.

 

If you want to rule in or out variable cam timing, look at intake and exhaust camshaft timing specified against actual in adv meaduring blovks. It will give you a good idea but I doubt it. And all my go to ideas you've already replaced.

 

Checked fuel pressures? 

 

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@fastandy hey man thank you so I did check the valve timing and it's definitely off from the specified to actual now I'm no mechanic and don't understand when we get this deep into it but I figured that's not good.as for fuel pressure I'll try to see if I can figure that out. So I actually have an appointment at VW and they are gonna diagnose for free cause I chewed them out a bit cause they practically ripped me off and denied it but then offered to do free diagnostic so I think I won lol another weird thing is before I had the software update from VW my car's fuel economy was great now it's trash I was getting like 9L to 100km now I'm getting 14 L to 100 km in city so whatever is wrong doesn't like the update 

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13 hours ago, JDvanb said:

@fastandy hey man thank you so I did check the valve timing and it's definitely off from the specified to actual now I'm no mechanic and don't understand when we get this deep into it but I figured that's not good.as for fuel pressure I'll try to see if I can figure that out. So I actually have an appointment at VW and they are gonna diagnose for free cause I chewed them out a bit cause they practically ripped me off and denied it but then offered to do free diagnostic so I think I won lol another weird thing is before I had the software update from VW my car's fuel economy was great now it's trash I was getting like 9L to 100km now I'm getting 14 L to 100 km in city so whatever is wrong doesn't like the update 

9L in city would beat my car. In urban, not really city driving, but including a decent amount of start stop - traffic lights, 30 to 40mph, I get about 480km from 48-50 litres. So that's over 10L/100km and that is driving fairly sedately.   But for you to have noticed that much of a fall, that is a big movement! What update was loaded? 

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13 hours ago, JDvanb said:

So on obdelleven I found camshaft adjustment specified and actual and at idle actual fluctuates alot and driving it seem to be always a couple lower then specified and fuel pressure seems to be a 100 to 200 kpa less then specified idk if that big enough to cause an issue 

If the cam adjustment phase is not following closely specified or fluctuates around several degrees at constant rpm, it likely means the camshaft solenoid magnet or adjustment valve is on way out. Mine did that. The intake one often does it first (front of car engine). The magnet is the easier and cheaper first fix.  And mine started to intermittently report timing set point retard or advance set point not reached if they get too far out and the ecu reports it - CEL. Brake cleaner freed the magnet pin for a while but the codes eventually came back within short time.  I didn't have noticeable misfires though, even with a frozen pin in the magnet although driveability / performance must have been affected. 

 

200kpa, that's, like 30psi?  From what specified at idle? i,e. how much divergence in relative terms> The thing that is making me ask about fuel pressure is -  you've done a lot of everything else!!! And, if you are saying cyl 1 is the problem that is the last injector on the rail from the HPFP on the right hand side viewing from front of vehicle?

 

You could log fuel pressure at WOT briefly as well and see if it is underperforming under higher loading.  I looked in the VW mk7 repair manual i have on the HPFP sections but bizarrely there is no testing or pressure thresholds to apply just removal and install instructions but I have heard of the regulators being replaced before. Maybe some more google searching may throw up something ........

 

I could look at mine at cold start, fast idle, normal idle if you think it will help you.  Yours is Canadian, so I guess NA spec, no MPI injectors then just DI injectors.

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So to get back to everyone I did a compression test today and cylinder one is reading 118psi while the other cylinders are around 140-145 psi. So I'm assuming that is my issue honestly don't know what to do with this information I think I'm selling my dream car . What's crazy is I've never driven this car hard I've babied it 

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10 hours ago, JDvanb said:

So to get back to everyone I did a compression test today and cylinder one is reading 118psi while the other cylinders are around 140-145 psi. So I'm assuming that is my issue honestly don't know what to do with this information I think I'm selling my dream car . What's crazy is I've never driven this car hard I've babied it 

Oh. Sorry to hear that. From what I can recall reading wear limit is 101psi and max differential is 43psi per cylinder. I will try and confirm in the vw manual I have.  Technically, you'd be within that. But 27 is quite high and you have to wonder if that is the cause or contributing given its the problem cylinder. What did the plug look like. Is it fouling? 

 

CJXC compression tolerance in vw manual.

 

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