Ok guys in need of advice here. Its the same prob I've had for nearly two years. Cylinder six isn't working properly.

 

Replaced PTU, Coil Pack and cleaned all connections BUT today i've had enough and disconnected all the injectors one by one. Every single one makes a difference except cylinder six (top right as you stand in front of the car).

 

Any ideas? Dead injector, dodgy wiring? All the injectors read 11.37 - 11.51 volts . but how to i test if each one is receving a signal to tell the injector to squirt? And if the wiring is working could it be a dead injector? If so how can i test.

 

this is gettin urgent now and its driving me mad both in the amount of fuel i'm using and the fact that it'll be destroying the cylinder if it already hasn't.

 

Please help guys.

 

Rich :headvswal

Put a screwdriver tip against the injector and listen for if its clicking through the handle. If its not, you know its dead or not recieving a signal. All injectors have a contant 12v feed and are switched on the earth. Only way really to tell if the signal is getting through ok would be to hook it up to an oscilloscope, signal chages too fast really to register on a multimeter, you might have some degree of success though.

 

I assume you have confirmed the spark and compression are good?

Put a screwdriver tip against the injector and listen for if its clicking through the handle. If its not, you know its dead or not recieving a signal. All injectors have a contant 12v feed and are switched on the earth. Only way really to tell if the signal is getting through ok would be to hook it up to an oscilloscope, signal chages too fast really to register on a multimeter, you might have some degree of success though.

 

I assume you have confirmed the spark and compression are good?

 

Yes I've confirmed the spark is fine and have replaced the coil pack and tested it twice! But I haven't tested the compression yet, need to find a compresion tester really!

 

Even if the compression was low, surely it would make some kind of difference to the running of the engine with the injector or coil pack disconnected? Because there isn't the slightest change in the engine note when either are disconnected which is what firstly aimed me towards the spark side of things. But after whippin off the injector there is absolutely no difference.

 

When u say hold a screwdriver next to the injector do u mean with the connector connected or short the pins?

I mean just press it against the top part of the injector which you can see, and put your ear against the handle and listen, you should be able to hear a distinct ticking from it.

Ok I've been on the Z32 technical index and found info on the resistances for injector coils. They should be between 10-14 ohms. I've tested mine and they are all between these variables ahich means my injectors is ok right? Is there anything else that can go wrong with an injector that would stop it working?

 

And as I've changed my coil pack, what else is left to check?

 

Please help

Just because its ok electronically doesn't mean the mechanics havent broken in it.

PS i couldn't hear any ticking over the damn rattling of the misfire!

rattling? should just chug a bit with a cylinder down.

PS i couldn't hear any ticking over the damn rattling of the misfire!

Right i'm goin back out, so i'm puttin a screwdriver basically while its connected to the face of the injector that u can se as u look down yeah?

 

Just to make sure i've done it right.

Right i'm goin back out, so i'm puttin a screwdriver basically while its connected to the face of the injector that u can se as u look down yeah?

 

Just to make sure i've done it right.

 

Yeah its chuggin a lot, but i've got the puff puff puff through the zorsts and its pretty loud, should i hear the ticking over that?

yeah, if I remember, its a metal bit you can see from the top.

 

edit - yes, it will sound like a scooby and shake the car to fook.

yeah, if I remember, its a metal bit you can see from the top.

 

ok give me a few mins to get it sorted! then I'll give a report! Thanx mate!

yeah, if I remember, its a metal bit you can see from the top.

 

edit - yes, it will sound like a scooby and shake the car to fook.

 

yeah thats exactly what its doin, but the injector is ticking, all of them onthe left bank are. but when i disconnect injector OR coil pack it makes no difference to the running.

 

I'm lost. its been lie this for ages and its driving me mad!! :headvswal

I went and had a look, and yes you can see the whole top of the injector assembly, a good view too with the throttle cover off.

 

OK then, sounds likely the injector is working if it sounds exactly like the others, is the plug wet with fuel? If you've got fuel and spark then you've either got no compression or its just majorly flooded.

I went and had a look, and yes you can see the whole top of the injector assembly, a good view too with the throttle cover off.

 

Done..see above!

Well the last time i checked to see if the plug was wet, yes it was. It stank of fuel too!

injector sounds fine then, try swapping the plug with another, leave it out overnight though to let the bore dry out. If its been like that for a bit you probably have a bit of bore wash so might be an idea to change the oil.

injector sounds fine then, try swapping the plug with another, leave it out overnight though to let the bore dry out. If its been like that for a bit you probably have a bit of bore wash so might be an idea to change the oil.

 

Right i changed the oil last week, so thats done. I've mixed the plugs about before and its made no difference at all. I'll do it again tomorrow but got any other ideas?

The coilpack is deffinatly working? If it is, then my educated guess would be no compression :(

The coilpack is deffinatly working? If it is, then my educated guess would be no compression :(

 

Oh shit :( not what i wanted to hear :( well i'll have to get it checked cos it s new coil pack.

 

Thanksfor your help mate, much appreciated.

No problem, thats just what i'd think anyway, I hope some others will come along and give their opinions/suggestions.

No problem, thats just what i'd think anyway, I hope some others will come along and give their opinions/suggestions.

 

So do i buddy, so do i!

Sounds like a dodgy coil pack connector or one of the wires going to it. Mine has the same problem but it only happens when I disturb something. It goes down to 5 cylinders, so I try to find out whats wrong, then after about 5 mins of me unpluging/plugging connectors and wiggling wires it just goes back to 6. Usually when I've just about given up.

From memory the 3 wires going to the coil packs are +12v with ignition on, permanent earth, and the other one runs to the left hand PTU connector and tells the coil pack when to spark. The earth and 12v are easy to check, but the other one a bit of a pain as you have to remove the connector off the PTU.

I checked all of mine and didn't find anything wrong, but it was running on 6 at the time so that makes sense. Also, try checking the pins in the coil pack connector, to make sure they're not shoved too far up or or bent apart or something. Never heard of this but you never know.

That's alll I can think of at the mo.

 

Rob

Sounds like a dodgy coil pack connector or one of the wires going to it. Mine has the same problem but it only happens when I disturb something. It goes down to 5 cylinders, so I try to find out whats wrong, then after about 5 mins of me unpluging/plugging connectors and wiggling wires it just goes back to 6. Usually when I've just about given up.

From memory the 3 wires going to the coil packs are +12v with ignition on, permanent earth, and the other one runs to the left hand PTU connector and tells the coil pack when to spark. The earth and 12v are easy to check, but the other one a bit of a pain as you have to remove the connector off the PTU.

I checked all of mine and didn't find anything wrong, but it was running on 6 at the time so that makes sense. Also, try checking the pins in the coil pack connector, to make sure they're not shoved too far up or or bent apart or something. Never heard of this but you never know.

That's alll I can think of at the mo.

 

Rob

 

ok i have another problem, I've lost loads of power now and she feels and sounds like a damn subaru :( i give up. i'm doin cylinder checks and according to the software i've lost cylinder 4 aswell. But this is with a 4 month old series 2 ptu on, so it can't be that. I'm so lost, anyone close to Chester to come give me a hand, or anyone with conzult?

I'm getting confused about these coil packs as you have mentioned injector coil packs ?. Why dont you remove each plug coil pack in turn and put a spare plug in it to see if it sparks. This will confirm the electrics thus so far. If all ok, perhaps you just have some duff plugs. What make and type are they. It does sound like it ignition related.

I'm getting confused about these coil packs as you have mentioned injector coil packs ?. Why dont you remove each plug coil pack in turn and put a spare plug in it to see if it sparks. This will confirm the electrics thus so far. If all ok, perhaps you just have some duff plugs. What make and type are they. It does sound like it ignition related.

 

Sorry i mean injectors AND coil packs! Laready done the check all cylinders firing.

 

Although I have just found out i have dodgy electrical connections to my injectors. Not good!