Missfire

[Steveohim]

Yes sorry that's what I meant knocked out


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[Steveohim]

No error codes, but the plugs were in pretty bad condition so fingers crossed, it happened again this morning for about 5 miles then disappeared


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[Wabbitkilla]

Sounds like it just needs a darned good service, new plugs and all.

[Steveohim]

Well on the 30 mile drive home the engine management light did flicker for a minute or 2 but no misfire as far as I can tell, could a coil pack be at fault?


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[Lurch]

I had this on mine and mine has only done 10,800 miles from new but stored over winter months, turned out to be one faulty spark plug , although no mileage but with age it still failed so a new set of plugs sorted mine.

[Steveohim]

Had new set put in, seemed to improve it but the engine management light flickered for about 2 miles, not sure if it misfired as I was going quite fast with the roof down, it's weird that it bought no error codes on a snap on code reader, quite frustrating. I've bought myself a cheap code reader the will try plug it in when it happens again


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[Lurch]

Mine was saying misfire cylinder 3 so I moved the coils around first , reset the code and drove it again and said cylinder 3 again so that iliminated the coils, swapped plugs around reset it and went for a drive and a different cylinder fault occurred so knew it was a doggey plug. Replaced and reset , sorted. May be a coil pack ?

[Steveohim]

I'm hoping it will give me a code when it happens again but nothing when its fine

[Steveohim]

Ok so I got my code reader through today, and when I connected it it gave me a code of  po304 cylinder 4 misfire, the plugs were changed so I'm guessing it's a coil pack? What does erase codes mean on the reader, is that erase codes from the ecu?

[Wabbitkilla]

Erase codes means erase the current error codes from the ecu.

Swap coil packs 3 & 4 over to verify if the fault follows the coil pack. If it does ..... replace it

[Steveohim]

Ok just to confirm number 4 is on left as you look at the engine under bonnet?

[Wabbitkilla]

Ok just to confirm number 4 is on left as you look at the engine under bonnet?

Correct, they number 1 to 4 from the timing chain end of the engine.

[Steveohim]

Ok thanks but after I cleared the codes I drive it about 5 miles and no codes have reappeared since, does that mean it was the plugs?

[Wabbitkilla]

Please be logical about this.
1. You said the plugs were in bad shape.
2. You said the plugs were changed.
3. You said the misfire was still there.

You can understand how I am now getting totally confused by your statements.

So can you please tell us what the order of events is?

[Steveohim]

Please be logical about this.
1. You said the plugs were in bad shape.
2. You said the plugs were changed.
3. You said the misfire was still there.

You can understand how I am now getting totally confused by your statements.

So can you please tell us what the order of events is?

i never said the misfire was still there, i said the engine light flickered on for about 2 miles. yes the plugs were in bad shape, so changed those, got my reader through today and it said misfire on cylinder 4, so cleared codes and drove it 5 miles took another reading and still no codes, so i was asking was it possibly the plugs, but if it was why did the engine management light flicker on when driving back from the garage just after having the plugs fitted?

[Wabbitkilla]

Ok, some codes take a few trips to appear.

Go out for a few trips and see how it goes.
Fresh plugs make a lot of difference.

[spit]

The usual plan of attack for misfire after you've ruled out duff plugs is exactly what Wabbit has suggested - swap coil packs around and see if the code moves with the offending pack. If it does, replace the coil pack, if it doesn't, get your cyl4 injector checked out.

Above all, don't drive the car if the EML is flashing.

As for why your EML has been intermittent, well, who knows. Maybe you're up and running again following a severe misfire fault. If it returns, take action.

[Steveohim]

Why is it important not to drive it if it's flashing? I would of thought it would be more serious if it was permanently on

[spit]

Really? I suspect most people would disagree with that.

Its pretty standard on cars for a steady light to indicate a service code and a flashing light to indicate a more serious fault.

[Steveohim]

Ah ok, didn't know I will keep my eyes open for it

[Steveohim]

Update*
Swapped the coilpack from cylinder 4 to cylinder 3 erased codes took for a drive, started to misfire took a reading, still saying cylinder 4 with a flashing engine management light, what next? Injector is failing?

[Carolyn]

If you're up for it:  Swap injectors 3&4 and see what gives.  If it's the injector the fault should move.  If not, time for a compression check.

[Steveohim]

If you're up for it:  Swap injectors 3&4 and see what gives.  If it's the injector the fault should move.  If not, time for a compression check.

is there any how 2's for that? just looking through my service history and it appears cylinders 2&3 have had injectors replaced so I'm hoping its that or i think I'm going to be in trouble. would a faulty injector cause a flashing EML?

[spit]

is there any how 2's for that?

Not something I'd recommend if this is your first time at it. Older seals and seats get very brittle and petrol leaks are not pleasant. One for your garage friend maybe? In the right hands its no more than a 20 minute job.

Never encountered this giving a flashing CEL but I guess its possible. It may not be your answer but its sensible to find out or at least rule it out.

[Steveohim]

It's an intermittent misfire that only flashes when the misfire happens if any help?