Help!! OBD shows cylinder 5 Misfire and also readiness montiors not working.

Cel keeps coming on. P0305 for cyl5 misfire. Had it 3 times now over a week and also one P0152 - 02 sensor high voltage bank 2 sensor 1, which I guess is as of a result of the misfire?

Searches on here suggest some sort of test with brake cleaner to test the gasket underneath the inlet but I'm not to sure exactly what that involves or if I can do it myself. Another person who had the same code found it was just a faulty spark plug. Is it easy for me to swap the plug with another cylinder to see if that's the cause? As you can probably tell I've never done either before.

Should I be concerned and take it to my dealer straight away or are there things I can try beforehand even if only to localise the problem?

OBD also says some of my readiness monitors are incomplete too. The evaporative system and the catalyst system monitoring are always out and on my last check the oxygen sensor was too. Is this something to worry about too?

Sorry for all the questions but I am worried and would appreciate any feedback.

 

Thanks so much guys. Definitely more worrying than I thought so I'll stop driving it and get my mechanic to have a look.

Just had a little look around the plugs etc and couldn't see any obvious problem there but then I checked the inlet manifold. I can see the paper gasket which is dry and intact all the way round except for the right hand side when looking at the engine, in the corner closest to the back of the car. Is this above cylinder 5? Really worried now

I will take some pics now....

 

First pic is of the left side bank (when standing at the rear of car) and shows a dry gasket.

Second pic is the opposite side and oil coming from the gap.

Can anyone confirm this is likely my problem? Will do some research if so as I guess its not a simple problem to fix.
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Phew, I didn't know which was cylinder 5 so at least thats given me a some hope. The gasket seems ok above the rear left. I'm using just a standard OBD unfortunately. I'm hoping my local guy can check it over first without having to take it somewhere with an SD2. Especially if its not advisable to drive as is.

I'm praying its just the plug or something simple but all plugs were changed a year ago and the car has done 5k since so I'm guessing its unlikely.

 

Ok cool, thats something I am competant with at least. The misfire code doesn't pop up straight away though so I would have to drive it a bit after swapping the coils, dya reckon this is worth it? I cleared codes yesterday and the misfire didn't flag up for about 20 miles although it does sound slightly lumpy from start up (although doesn't sound like there is something seriously wrong). Thanks again mate.

 

Thanks guys, will def do that now. Managed to finally get hold of my mechanic and he suggested the same. Said it would be rare for me to much damage running on a test drive with a misfire if not giving it the beans so I'll pray thats the case. He reckons it is almost certainly a coil or plug with that code. Said I would be getting lean mix codes if the gasket had gone, plus my LTFT was around 6% which I think is pretty normal. Saying that though he's no ferrari mechanic so I take you guys word over his so let me know if thats not right.

If after swapping the coils the misfire stays on cylinder 5, I might swap the plug with another cylinder just to confirm the misfire swaps with it. This would confirm the plug right? My mechanic said it wouldn't be worth it and just to replace all plugs if the coil wasn't at fault. Can't see the problem with just replacing one myself, especially as they are not very old but I think he thinks all ferrari owners have money to spend on stuff like that without a second though. If only!

 

Thanks a lot for the advice and no need at all to apologise for your earlier post! I've just changed the coil with cylinder 4 and the plug with cylinder 6, then cleared the codes. Hopefully now if I keep an eye on the obd then it should narrow it down to hopefully the cause of the issue. Your method sounds a lot better actually and quicker to diagnose but it getting dark and starting to snow in cardiff so i'll leave it for today I think.

The spark plugs were different to the type listed in the manual. I have NGK R PMR8B while the manual recommends PMR7A. Do you know if this is ok and if I do replace a plug, which type to go for? I guess mix and matching isn't good?

I saw your previous thread when you had the same problem and it has helped me so thanks for that. I think the plenum chamber leak might actually be just spilt oil on the engine cover that has trickled down. I've cleaned it up and will keep an eye. Positive thinking anyway! I didn't know the gasket everyone has mentioned is at the bottom of the legs. I have no idea how I would see if that is leaking especially at the rear where cylinder 5 is! I'm guessing I'll have to look into that if cylinder 5 is still misfiring with a replaced coil and plug.

Thanks again for your help and please keep your fingers crossed that its only something simple!!

 

Damn, I thought it was the one on the left furthest back! Greyboxer said...

The normal numbering would have cylinder 5 as left rear when looking forward

... But i guess i've taken it wrongly as rear being the back of the engine bay, not rear of the car. Thanks for noticing though, guess I'll be putting my coat on and getting back out there with a torch then!

 

Thanks guys, my fault entirely. And yes I should have done a search for the spark plug too.

Going to change the correct coil and plug now and then going back to sleep I think. Or sufficating myself with a pillow might be better!

 

No it was my fault being a numpty!!! Yes all changed correctly now. One handed with the other holding a torch, in the pitch black and freezing snowy conditions. It must be love!!

Once again thanks for all your help and I will report back once I know if it was the coil or plug or something else.