All Things Mk5 > How to Guides / Troubleshooting

Spark plug gaps

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AJP:
@maxitrol Is it maybe worth merging this with the thread I linked to in the first post please?

They're both covering the same issue and it'd probably be more helpful to someone reading up on the issue in the future.

r5gtt:

--- Quote from: AJP on August 21, 2016, 01:28:30 pm ---Update.

Borrowed my brother's OBD2 thing, expecting to see a cyl 2 misfire code, but... nothing! No codes.

It definitely misfired the day after I fitted the new coils and every day since, the only difference this time is that the engine light flashed but didn't stay illuminated. When I originally had the misfires, before I fitted the coils, the engine light flashed, stayed on, and subsequently I got the cyl 2 misfire code, which I then cleared.

So, to recap, the misfire appears to have subsided and there are no fault codes. I removed the spark plugs, and didn't find anything of concern. They all look similar and they don't look fouled: (1-4 in order from bottom to top; that's just a bit of tubing on plug 1 because the socket wouldn't grab it)



Here's plug 2:



So, back in went the same plugs, this time with 2 and 3 swapped. The plan is to drive it as much as possible to induce the misfire, then scan it, see which cylinder it is.

I've got the new plugs waiting for if and when they're needed.

So I'm a bit stumped for today. The car pulls like a train and is as smooth as it gets. No fault codes. But I know something aint right.

--- End quote ---
Did you check for any hair line cracks on the insulator white part?.

AJP:
I wasn't specifically looking for cracks but I had a good look and didn't notice any. All the plugs looked very good, which I'd expect with them being 2k old.

One thing I did notice was that plug 4 was really tight compared to the other 3.

r5gtt:
I think you should take them out again and have a good look around thr insulated for cracks although it'd be a continuous misfire if one was cracked.

AJP:

--- Quote from: r5gtt on August 21, 2016, 01:57:38 pm ---I think you should take them out again and have a good look around thr insulated for cracks although it'd be a continuous misfire if one was cracked.

--- End quote ---
I will do. Although I agree, the intermittent nature of the misfire logically points to something other than plugs.

I guess if an injector is dying, it might work fine one day but not the other. It's just a solenoid after all.

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