Help me diagnose my misfire (and EML)

[Sandman77]

My car has had an intermittent misfire for a while now. It is no longer intermittent and the EML light is now on.
I have read the codes and they are:


Now, I am pretty good with a spanner and will try to fix the issue myself but I have absolutely no idea how to diagnose what the issue is so any help will be very much appreciated.
Any ideas where to start?

 

[ph001]

The only fault you seem to have currently present is the DISA. Trouble is I’m not sure which one the diagnostics refers to when it says no.2, so I would start with the one that’s easiest to get at! (The other requires removal of the inlet manifold). Quite rare for the DISA to fail on the N52 so I would check the connector is all good first before splashing out on a new one.

 

[Sandman77]

Thanks for pointing me in that direction. A bit of google searching has led me to believe it is the disa valve in the inlet manifold. I guess it’s a pretty big job then.
Would this be the cause of the misfire?

 

[Smartbear]

Thanks for pointing me in that direction. A bit of google searching has led me to believe it is the disa valve in the inlet manifold. I guess it’s a pretty big job then.
Would this be the cause of the misfire?

I would have thought flat spots more than a misfire with a faulty disa? :?
Rob

 

[Sandman77]

Yeah it’s definitely a misfire. Rough and bouncy idle too.

 

[ph001]

Well your diagnostic is clearly showing a fault with the DISA but indeed this may be a separate issue to the misfire which could well be a coil pack (assuming the plugs are good).

 

[Sandman77]

Today i swapped over the coil packs between cylinder 2 and 3 and the misfire code has moved to cylinder 2. I have ordered a new coil pack and will look into the other codes once I have cleared the misfire.

 

[Smartbear]

Today i swapped over the coil packs between cylinder 2 and 3 and the misfire code has moved to cylinder 2. I have ordered a new coil pack and will look into the other codes once I have cleared the misfire.

Get in!
Rob

 

[ph001]

I would replace all 6 coil packs for what they cost. Peace of mind and all that.

 

[Haggisman]

I would replace all 6 coil packs for what they cost. Peace of mind and all that.

Agree, I replaced 1 due to a misfire after I changed the spark plugs then another coil went almost immediately. Change all six and they are all the same age. Good peace of mind.

 

[Sandman77]

Probably good advice and I will do just that once I have sorted the DISA fault. The coil pack was only about £18 from carpartsforless so buying another 5 won’t break the bank.

 

[Sandman77]

Quick update - I replaced the coil pack and the misfire and lumpy idle are completely gone and the EML light has also disappeared from the dash. I haven’t plugged in my laptop yet but I think all codes may be cleared now. I’ll try to get the codes read tonight if it ever stops raining.