N52 hesitation, stuttering, jerking, surging etc
- Thread starter propaintballa
- Start date
propaintballa
Member
ph001 said:
I thought the same thing! Really hoping the coils are the issue. Have to wait a week or so for them to turn up though, which is less than ideal. I'll have to keep you updated as and when anything happens!
propaintballa
Member
Right then! Some good news and some bad news... More good than bad though. So got my new coils today and got them installed this evening. I took the opportunity to inspect the plugs and make sure they were torqued correctly (I torqued to 25Nm). I have just taken the car out for a quick spin, will go for a longer drive this evening, but idle is a lot better and generally the car feels a lot smoother, especially at those troublesome RPMs. I do not feel the issue is completely remedied though, however, it could have something to do with the plugs and the story they may tell.
I have attached some pics of them, and to me (I am no expert on reading plugs) but they look oil fouled. Could this have something to do with the amount of oil I found in the intake manifold? Weird though as there doesn't really seem to be any sign of it burning oil. Regardless of the larger issue that might be present, it does look like a new set of plugs would likely be beneficial. When reinstalling, I cleaned off the threads as I didn't want to blast the plugs off and find they were the issue all along.
Anyone care to voice an opinion on this? Thanks all! Getting there!
I have attached some pics of them, and to me (I am no expert on reading plugs) but they look oil fouled. Could this have something to do with the amount of oil I found in the intake manifold? Weird though as there doesn't really seem to be any sign of it burning oil. Regardless of the larger issue that might be present, it does look like a new set of plugs would likely be beneficial. When reinstalling, I cleaned off the threads as I didn't want to blast the plugs off and find they were the issue all along.
Anyone care to voice an opinion on this? Thanks all! Getting there!
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propaintballa
Member
ph001 said:
Been looking for any info on EGR issues or even just the existence of it on this model and I can't find anything. Might it be more to do with CCV as mentioned below? Also wondering whether it could be a remnant from before I had the valve cover gasket changed.
Smartbear said:
Oh right, was there an actual issue in the end? Blocked CCV or similar? I'll have to check my oil level to see if it is actually using oil.
propaintballa
Member
jack07 said:Doh! Just seen plugs,sorry
Haha, no worries. Your thoughts on the current plugs?
propaintballa
Member
Smartbear said:
Oh right, was there an actual issue in the end? Blocked CCV or similar? I'll have to check my oil level to see if it is actually using oil.
[/quote]
I blamed a partially blocked ccv system as after flushing it through with sea foam several times matters improved to normal levels.
Rob
[/quote]
Interesting. Do you have any info on how this can be done? I've noticed quite a bit of oil usage, bearing in mind i only changed the oil about 1000 miles ago, which combined with the oil in the intake, would suggest an issue with the CCV...
propaintballa said:
I blamed a partially blocked ccv system as after flushing it through with sea foam several times matters improved to normal levels.
Rob
[/quote]
Interesting. Do you have any info on how this can be done? I've noticed quite a bit of oil usage, bearing in mind i only changed the oil about 1000 miles ago, which combined with the oil in the intake, would suggest an issue with the CCV...
[/quote]
Hi, I just put a load down the top pipe with a large syringe & blew down the lower section until I could hear the oil bubbling in the sump!
I did this several times and ran the car until it was hot and changed the oil 8)
Rob
propaintballa
Member
Dammit, I've only just changed the oil -.- haha
propaintballa
Member
Quick update: So I replaced the plugs with some NGK Iridiums and the issue still persists. Getting a bit fed up of throwing money at it at the moment, so just going to leave it for now. Could be CCV, I don't know :/
I am sure you have checked, but make sure all the coil packs are seated all the way down on the plugs. I found the newer type coil packs did not seat as well as the old 'click' type. Wiggled mine all the way down and problem went away.
Long shot, but worth looking at?
Long shot, but worth looking at?
Don't give up - you haven't even got to any of the expensive bits yet! You said you had a lot of oil in the intake, increased oil consumption and plug fouling. Sounds like no.4 on the list is almost obligatory...
1)Observe O2 sensor voltages in INPA
2)Fit new battery
3)Replace coil packs and plugs
4) Replace CCV valve and check pipes to sump for blockages
5) Replace / inspect second DISA valve
6) Replace valvetronic motor
7) Have VANOS unit stripped and inspected.
1)
2)
3)
4) Replace CCV valve and check pipes to sump for blockages
5) Replace / inspect second DISA valve
6) Replace valvetronic motor
7) Have VANOS unit stripped and inspected.
propaintballa
Member
.AveZ4coop said:
I actually bought the 'old' type, assuming by that you mean the Bosch coils as opposed to the Delphi replacements? Thanks though, I will double check although I feel like I was pretty positive in my hammering them in in anger at the time
ph001 said:
That's not true! I've done MAF, 2 VANOS solenoids, eccentric shaft sensor and VCG! The latter of which isn't THAT expensive but I think the rest is, especially considering the monetary value of the car. I think I'll have to wait until after Christmas as we have a holiday to Barbados to pay for and a house we are renovating (problems happen at the worst times!).
After that, I think I will get that lower DISA out and have a look. There is a slight rattle in the engine bay which is hard to trace, but could be that. Then I think CCV. That is if I haven't just sold it by then. Though I suppose whilst inspecting the DISA, may as well do the CCV as the intake has to come off -.-
Another thing I read about actually, was someone with the same symptoms caused by the valvetronic motor gasket leaking. Which I feel would be obvious to the ear, but I might check that out. Unsure if the VCG kit comes with that gasket.
propaintballa
Member
Okay so quick update, if this counts as one, other than my bloody sunroof now randomly opening, I have stumbled upon a new bit of info from my OBD reader.
Within the "smooth running" live data, cylinder 5 appears to be running waaayyyyy out of the parameters listed (-200 to 200). -200 to 200 what exactly, I am not sure, but the values seemed to peak at ~-3000 (picture below). The rest seem to be around (-)50, +-50 or so.
Seeing as I have replaced coils and plugs within the last couple of months, my thoughts are now with the injector. Of course it could still be anything, could be valve or cylinder related, however I find the latter options highly unlikely... Any thoughts on the likelihood of an injector problem? When I have time, I could try swapping injector positions and see if the rough running follows.
The only problem I have with this diagnosis is that I have listened to the injectors for the solenoid function and they all seem the same to activate consistently and with the same volume. I have Also tried injector cleaner since I've had this problem which hasn't done anything (surprise).
Within the "smooth running" live data, cylinder 5 appears to be running waaayyyyy out of the parameters listed (-200 to 200). -200 to 200 what exactly, I am not sure, but the values seemed to peak at ~-3000 (picture below). The rest seem to be around (-)50, +-50 or so.
Seeing as I have replaced coils and plugs within the last couple of months, my thoughts are now with the injector. Of course it could still be anything, could be valve or cylinder related, however I find the latter options highly unlikely... Any thoughts on the likelihood of an injector problem? When I have time, I could try swapping injector positions and see if the rough running follows.
The only problem I have with this diagnosis is that I have listened to the injectors for the solenoid function and they all seem the same to activate consistently and with the same volume. I have Also tried injector cleaner since I've had this problem which hasn't done anything (surprise).
