Hello guys

i know your probably sick of reading through these post of misfires and tbh so am i

Basically i have developed a misfire after changing the coil packs and also the spark plugs... no here is my problem iv gathered after reading through the forum that my ned job to check would be the HT leads but for the life of me i cant find any online that are for the 1.6 stilo :bang:i spend my days at work looking for these instead of doing work hahaha also another question would be where do the leads actually go from the coil pack and are they an easy job to change?

any help would be greatly appreciated and im sorry for another thread on misfires i just didnt want to hijack someone else's thread with my own misery

Thanks

Callum

Oh and for info the misfire is on cylinder 4

All Stilo petrol engines have individual coils, one on top of each spark plug, so your car doesn't have any HT leads.

If the misfire is on cylinder 4, swap that coil with one from another cylinder. If the misfire moves with the coil, then the coil is faulty. While cylinder 4 coil is out, check the spark plug gap.
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My mistake I didn't realise that thanks for the reply ill check the gap tomorrow at somepoint and let you know how it goes... Thank you

so i checked the gap and its at 0.8 which i what iv read to put the gap to on the 1.6 and again after taking all the plugs out and cleaning them (only a few week old) there is still a misfire im just at a loss as to what it could be

cheers

Callum

Did you swap the coil to another cylinder as I suggested in post 2?
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Ye changed them round and still there albeit it's not as bad, iv just been reading that an air leak In the exhaust could cause fouling on plug causing a misfire. I'm skeptical about this but when I bought the car the muppet that owned it prior to me put a stupid back box on that makes it sound horrible (some people like that) and I never got round to changing it it is very bubbly and it does seem to blow so it's getting changed anyway hopefully next week at some point... Could it be something as daft as that?

You can't find your HT leads because your car doesn't have any. It's LT all the way to the coil. If you're sure it's cylinder 4, why not swap a coil with another cylinder? If the misfire follows it, you'll know it's your coil that needs replacing. If the misfire stays on cyl 4 then it's probably a duff plug.

Ye i know that know i just presumed the leads were called HT but the plug sparks and the misfire stays in cyl 4 ill go grab a new plug now and see what happens if it still misses or not and post back

So changed the plugs again and sure as hell the misfire is still there they are all performing as they should apart from the 4th cyl so as i stand i have had new coils packs in, all working (swap tested them and the misfire stays in the 4th) new plugs all working ... any more suggestions guys...

thanks for every ones thoughts up to now anyway

Faulty/ clogged injector no. 4? Any unburnt fuel on the spark plug when remove it? I know you've had coils and plugs out a few times now lol but determining whether there is or isn't unburnt fuel on the spark plug will narrow it down for you. Has the engine light been flashing on the dash? That means the ecu has detected a misfire, if not have you got any fault codes?

Have you tested the injector there is a guide on how to test.

Really sorry I never got back to anyone been setting up new home and not had chance... Not been able to read codes as I don't have a diagnostics tool ... There is fouling on the plug on 4th plug and yes the engine light is on

Try the engine ecu it could be braking down that could course your misfire I have the same problem and I have been told to change ecu by 3 garages only problem is all 3 of them don't do ecus lol

check for spark at plug
check injector is the spark plug wet.
do compression test

What condition is the 4th plug like relative to the rest?

You could clean it up and make sure the electrode's clean to ensure it can give a good spark. If my memory serves right I think the ecu problems were most common on the 1.6 and the problem was a fried injector circuit in the ecu. Having the ecu read for fault codes should show up what the fault is. You could unplug the injector wiring plug and test for voltage and resistance or whatever and compare to the other 3 injectors.

when i take the 4th plug out it is always a bit damp with oil but when i clean this up it seem to be good underneath that... when i finish work today im going to do the injector test see what the crack is with that... i dont want to divert this topic away to what has already been posted but iv been reading through the spark plug threads and the debate between ngk and bosch at the minute it is running with ngk but they are the irridium ones now i know these are not reccomended in a car that isnt tuned i wonder if it could be something as simple as changing to the standard ngk or bosch ones

Morning/Afternoon chaps

Just a courtesy post really as and update and thanks for all your help

Had dads friend come round with a snap on modis diagnostics kit and had him do the once over... low and behold it is the injector on cylinder 4 that is the problem... fault code p0204...

he advised me to get something called forte (injector cleaner, redex to me) and try that before I go as far as buying a new injector and rail set or just injector either way

so when I get home im going to use this and also get some contact cleaner on the the injector connection that's just right of cylinder 4 and see if this is the problem :worship: wishful thinking I know but worth a try as the cost is next to nothing

again thanks for your help guys

p.s. if it comes to me needing a new injector does anyone have one going that I can purchase from you or know anywhere that I can get one that's not going to be £121 haha

P0204 = Injector Circuit Malfunction - Cylinder 4

It doesn't necessarily mean you need a new injector. Normal diagnostic procedure would be to swap the injector with one from another cylinder. If the fault code changes, (e.g. to P0202 if you swapped it with cylinder 2) then the injector is faulty. If the code remains the same, then the fault is in the wiring between the number 4 injector connector and the engine management ECU.
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Cheers for that ill get on this over the weekend... is it a bigish job as i know the injectors are quite far down in the engine on the 1.6 model (think im right in saying this)

Thanks

I would just buy a

MaxiScan MS300 OBD2 EOBD II CAN BUS Code Reader Engine Diagnostic Scanner Tool

from Amazon or Ebay, no better tool to spend less than £15 on delivered. Huge help with these sorts of problems and pays for itself in no time. I'm not a seller of such things.