Hey ya'll,

So been round pulling plugs to check if the revs drop etc and cylinder 4 doesn't seem to drop.

 

What do I need to go round checking?

I put the timing light pick up on that cylinder and its flashing.

 

Spark plug?

How do I check mate?

Get a long screwdriver. Put the tip on the injector, stick your ear on the handle.

 

Try a working one first so you know what it sounds like and dont think i'm winding you up

You mean remove the CAS altogether and turn it in the air sort of thing

Check the connections, check for he click, check for spark. Ohm injector and check plug coloration.

Not checked the plug coloration on the injector, the coil packs are real clean though.

I just went out and checked the injector with a screwdriver. It's definitely ticking really quickly as are the rest.

 

I guess the next thing to check is the spark plug?

 

Not sure if it matters but that side (passenger) exhaust seems to be smoking a fair bit. I made a video of the exhaust a couple of days ago

Have you checked the ptu connections for green crap? Was the cause of my cylinder problem.

 

Probably a crap/missing spark then, the smoke (black?) is mostly likely an offset of the I burnt fuel.

Have you checked the ptu connections for green crap? Was the cause of my cylinder problem.

 

No but I will. 2 minutes

The TPS connectors are clean

 

- - - Updated - - -

 

Probably a crap/missing spark then, the smoke (black?) is mostly likely an offset of the I burnt fuel.

 

Added the videos mate

Looks grey, just start at the beginning and work through. You need spark fuel and compression to fire the cylinder. One or more of those isn't happening.

Any idea on the smoking? I'm a little worried about that

occasionally i have this on one side too.

found mine to be a dodgy wire for the o2 sensor and when its not working properly it smokes on idle.

fiddle with the wiring and it goes again.

So maybe either your loom is dodgy, or maybe the o2 sensor is.

could be completely wrong but just an idea for you to look into.

Thanks mate. For some reason I'm wondering if the smoke is related to the cylinder

Do a compression test first of all.

Do a compression test first of all.

 

I know it's probably not advised and all that, but, can you do a test on a single cylinder without taking all the coil packs and plugs out of the engine?

I know it's probably not advised and all that, but, can you do a test on a single cylinder without taking all the coil packs and plugs out of the engine?

 

If you really must, but you may as well just remove all the plugs and do all the cylinders as it's important to get compression values for the adjacent cylinders accurately.

I'm just thinking of the time I don't really have. So should I do the whole bank? I'm gonna check the spark plug first anyway if a few minutes.

Sorry, if I am only going to do the one, would I only need to remove the plug and stuff from the cylinder and leave the others in?

You're supposed to remove all the plugs & keep the throttle open for an accurate result. You'll need about 45mins.

i wouldnt go jumping to conclusions before you look at the basics.

 

you know the coil pack is triggering as the strobe light was flashing - so it cant be the PTU

 

most likely is a green corroded injector connector or the injector its self is stuck closed/blocked.

 

this means that cylinder is effectively pumping fresh air down that back to the 02 sensor.

 

the ECU doesnt know it's a dud cylinder so it takes the 02 reading (which is now grossly 'lean' when combined with the other 2 working cylinders) and adds fuel to that bank - making the remaining 2 cylinders rich and causing the smoke.

 

if you have a compression tester to hand - great, do it anyway for piece of mind. just remember to have the throttle 100% open when you do it.

 

cheers,

Spark plug pictures

 

 

 

 

i wouldnt go jumping to conclusions before you look at the basics.

 

you know the coil pack is triggering as the strobe light was flashing - so it cant be the PTU

 

most likely is a green corroded injector connector or the injector its self is stuck closed/blocked.

 

this means that cylinder is effectively pumping fresh air down that back to the 02 sensor.

 

the ECU doesnt know it's a dud cylinder so it takes the 02 reading (which is now grossly 'lean' when combined with the other 2 working cylinders) and adds fuel to that bank - making the remaining 2 cylinders rich and causing the smoke.

 

if you have a compression tester to hand - great, do it anyway for piece of mind. just remember to have the throttle 100% open when you do it.

 

cheers,

 

I've had a Zed in that was running on four due to two injectors not firing. It didn't pump smoke out the back at all. Even AFRs as rich as 10:1 don't cause smoke like that.

 

A compression test is one of the most basic yet informative tests you can do. If it was my car, that is what I would be doing first & foremost if I had lost a cylinder and it was smoking out the back.

Edited September 3, 201312 yr by Noz

So when I took this plug out, I started the car with it out to try and ground the plug to the plenum. When I did the plug wasn't sparking at all. Just seemed dead.

 

There was also a bit of smoke came up and I could see what appears to be drops of antifreeze that I'm guessing got spurted out.

 

Anyway, I've found another plug and put that it. But then when I started the car I saw the top rad pipe little rally pissing out so I'm not sure if those drop I'd saw were from that cylinder or just getting blown up. Anyway, I took the coil pack connector off and the revs dropped. I guess I can't really check further until I fix the rad pipe out which when I squeeze, i can hear air coming out.

 

Any ideas of the bit of smoke that came up and potentially the antifreeze drops. I'm just wondering if its possible head gasket probs

I've had a Zed in that was running on four due to two injectors not firing. It didn't pump smoke out the back at all. Even AFRs as rich as 10:1 don't cause smoke like that.

 

A compression test is one of the most basic yet informative tests you can do. If it was my car, that is what I would be doing first & foremost if I had lost a cylinder and it was smoking out the back.

 

cause smoke like what? i cant see anywhere on this post what quantities of smoke there was.

being down 2 cylinders will be even less likely to make smoke due to the dilution of the remaining cylinders. 10:1 AFRs and richer do smoke, especially those with no cats. i agreed a compression test is a good idea. if one wasnt to hand, there are other things to check.

 

im just saying its important not to jump to conclusions is all...