225 Cylinder Misfire Help

Hi all.
Wonder if anyone can shed some light on a misfire problem im having on my 225 trophy?

The other day i got stuck in a traffic jam and never moved for an hour but left the car running. Anyway engine management light started flashing after about 50 mins and once i got going the car was coughing/spluttering and misfiring. Managed to limp it home and put my scanner on it. Cylinder 1 misfire. So i got some second hand coils which was told were good but its still the same. 2 spark plugs had oil on them so got some new ones from Renault. Popped them in and still no joy. Ive took the plugs out and could see a small amount of oil on top of the pistons. Done a compression test on each cylinder and every one made 155psi so it cant be the rings.

Im collecting some new coil packs tomorrow morning but wondered if it could be anything else?

1st/2nd gear it misfires but once i move up the gears it pulls well with no misfire.

Any help would be much appreciated as got a day off tomoz to get to the bottom of it.

Cheers

 

Something i havent tried yet Matt. Is there anyway of knowing without sending them away?

 

Cheers Ian. I'll give it a try tomorrow. Any explanation of the oil on top of piston??

Anyway of cleaning the tops as its soaking the spark plug.

 

Am i right in think tge firing order is 1-3-4-2 with 2 being flywheel end?



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Yeah i done a compression test on each cylinder and repeated again to be sure. Every pot came in at 155psi both times.

I'll see if the new coil packs work and if so ill give it a good run with a bit of welly and see if it burns away. Might see if i can use my brake bleeder to pump some of it out before hand.

Failing that ill swap 2 injectors over.

Thanks for replying bud.

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Sorry, engine is on 67k

 

Well its deffo cylinder one (Gearbox end) that came up on my scan gauge and thats the pot that has oil on the piston along with cylinder 2

 

It looks very clean Ian with just a light film of oil on it. Will get a pic in morning. I gave it a fresh oil service today with new filter for piece of mind. Old oil wasnt to bad to be fair.

I always let it warm up & cool down for 5mins before turning the engine off.

Its bloody stumped me to be fair lol.

 

Haha very good point

No, hardly anything Ian but i had half a tank of juice in when this happened and after trying various things like 2nd hand coils etc its nearly empty so its drinking it and ive only been testing it up the road and back.
Plus the rear of the car is shit high with black carbon from the exhaust.

 

Could well be a possibility Ian. Yeah it runs great under load and pulls well in 4th/5th etc and comes on boost as it should. Im unsure if its been remapped or not. Nothing in my reciepts folder to say so.
Will try the coils first as getting them in morning, can always take them back if its not those. Ill then strip down the fuel rail and injectors and give them a clean. In the 2 years ive owned my trophy ive not seen any 225 sports where i live lol.
Will carb cleaner release them?

 

Cheers Ian. Something im not gonna have chance to get done today. Ive bought some injector cleaner to put in the tank so will see if that frees them up first.

 

Right im on the case now tgat i have all the new bits. Gonna try clean up the top of the pistons with my brake bleeder and a bit of card cleaner.

Puc of the plugs removed. These were brand new. In order 4-3-2-1




Also number 3 cylinder coil pack plug which isnt there but hasnt shown an error code


Ppic of inside the oil filler neck. It looks clean with just a light film of oil on it


I also noticed the end of this sensor had broken off and was held in by the clip. Whats this sensor for? I noticed that there is 2, one on inlet manifold and one on intake pipe. 2 different part numbers though. Can someone confirm which goes where?


Cheers


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Gimme a match

Fitted 4 new coil packs this morning along with adding some injector cleaner to the fuel and im still getting this bloody misfire
I also cleaned up the plugs with carb cleaner.
Fired it up and still misfiring so pulled off coil plug leads one by one. No1 stalled the engine, No2 nothing happened, No3 nothing happened, No4 stalled the engine.
So swapped them over and put 1 & 4 into 2 & 3 and its exactly the same. 1 & 4 cut out engine again so i know all 4 coil packs are good.

Cleared codes, fired it up again
and got code P0300 ( Multiple Cylinder Misfire)

Cylinder pots 1-2-3 have oil on piston, pot 4 is dry.

Its wrecking my head lol

 

Hi mate
No it was just a Wynns Injector cleaner that goes in the tank. Gonna remove the injectors tomoz and clean them up with carb cleaner.

Yeah i realise now that i should have done 1&2 then 3&4. Another job on the list.

Ive removed the intake pipe from throttle body and it was clean, including the throttle body which i did on the rebuild.
Pistons 1-2-3 have oil on top of them, number 4 is born dry including the spark plug.

I'll clean up the plugs again and swap them over so see if that helps. Sounds weird but its not run right since i fitted the bloody things.

I'll also try blocking those holes as you mentioned but what would i be achieving doing that? When i removed the pipe from the top breather cover it ticked over much better and you could feel the air sucking through it. Once i fitted it back it nearly stalled the engine.

Hahaha yeah process of elimination lol. Its going into Renault on sat morning and put on clip as i aint spending another penny until i can find out the root cause.
Until then im just trying to eliminate stuff by trying different things.

 

My mistake, i read the part numbers wrong. Yes both sensors have the same part number bud. The one broken was on the inlet manifold which would explain the error code P0235 ( Boost Pressure Sensor circuit malfunction)
Ive hopefully got another one coming but cant see it being the main issue of the problems im having?? Or can it?

 

Is there anyway i can test the spark plugs one by one to see if there sparking?
Something is swaying me towards a dodgy set of plugs.

 

Ahh right haha. Ill do that tomoz and see what happens. Better get some rags ready if it spews all out everywhere.

Yeah im gonna go back to the beginning and number the plugs and coils and start again.

Yeah it was the small breather pipe that goes from the top cover to the inlet manifold. Took that off and put my finger on the end of the pipe and it was sucking in towards the inlet manifold.

I have a brand new itg style filter set up with the cone down behind the front bumper. Cone looks fine bud.

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Ok so i cleaned up all the injectors, plugs and and it started up ok. Took it for a little drive and was still misfiring so back home, opened bonnet and bloody oil everywhere. Dipstick was 1/2 inch out the tube.
Its beat me

 

Hi mate, thanks for replying.

Im unsure if the car has been remapped at all but it ran perfect prior to what happened and did pull well although dont think it was mapped.

On start up there was smoke coming out of it like a bloody chimney. Proper thick but after the drive it was only a light haze but still noticable. Took the oil cap off and smoke coming from top end too.
Cleaned up all the oil and removed the plugs again, 1-2-3 soaking in oil including top of pistons but cylinder 4 (Belt end) is dry including plug.

I removed the injector rail again and 1-2-3 injectors had oil on the tips.

Ill do another compression test on monday when i can get it from my mates garage.

Could it be a turbo related at all? Blown? Im running a blanking plate and no dump valve (Chatter)