Just trying to get my head around why my V6 is sometimes a V5 or even worse, a V4. :headvswal

 

I've been told that the fuel injector on cylinder 4 does not work. I've checked to see if it 'clicks' using the long screw driver method and I can agree that it does not click.

 

So, if that is the case, if I pulled the coil pack connector the engine note should not change at all. Am I correct in saying this?

 

Also cylinder 1 is playing up, nothing wrong with the coil pack and the fuel injector clicks using the screw driver method. How ever if I pull the connector off of that, the engine note does not change at all.

 

So, can I assume there's a break in my engine loom some where?

 

Just a note, all cylinders do work, as they have been working on off recently. If anyone can help answer these questions that'll be great. :dance:

for cylinder 4 yes if the injector isnt firing, it wouldnt make any difference if the coil pack lead was unplugged or not so no change in engine note/revs expected.

 

As to cylinder 1, you say it works sometimes and not others, and when you fiddle with the coil pack conenctor it does work? Dodgy plug not sitting tight/square i have two which i temporarily fixed 9 months ago with some cable ties... worked fine ever since so "out of sight out of mind" etc lol

for cylinder 4 yes if the injector isnt firing, it wouldnt make any difference if the coil pack lead was unplugged or not so no change in engine note/revs expected.

 

As to cylinder 1, you say it works sometimes and not others, and when you fiddle with the coil pack conenctor it does work? Dodgy plug not sitting tight/square i have two which i temporarily fixed 9 months ago with some cable ties... worked fine ever since so "out of sight out of mind" etc lol

All the connectors to the coil pack connectors are brand new so they are definitely sitting tight and square!

 

So no change in note/rev is expected if a fuel injector is dead and you pull the coil pack connector out. That's weird cause when I pull it out, the engine note/rev does change. Which is where I'm quite confused here! :wack: Any ideas?

 

I have no idea with cylinder 1, when cylinder 4 was not working cylinder 1 was working fine, other times they both work! :eek: I've started to strip the wires back to see if there is a break anywhere but I can't find anything as of yet.

 

If anyone has any other suggestions other then changing the entire engine loom that would be great!

break in the wiring core nearby to the connector? I have a intermittent on rear driver side cylindr. Wiggle the wires just near the balance bar while the engine is running and the 6th springs to life. Cant find the problem but most of the time it stays all on song

break in the wiring core nearby to the connector? I have a intermittent on rear driver side cylindr. Wiggle the wires just near the balance bar while the engine is running and the 6th springs to life. Cant find the problem but most of the time it stays all on song

I'm stripping the whole loom down to see if I can find a break. Nothing so far. I'm still not sure about cylinder 4 as in theory it shouldnt be working if the fuel injector is dead. Unless someone knows otherwise!

Could be wrong without checking on PTU wiring diag but i had this same thing on one of my previous Zs(cant remember which :rolleyes: )turned out i think to be bad wiring from PTU,or a PTU fault,could be worth checking,if i am way off here, sorry chaps.

 

Tony

Could be wrong without checking on PTU wiring diag but i had this same thing on one of my previous Zs(cant remember which :rolleyes: )turned out i think to be bad wiring from PTU,or a PTU fault,could be worth checking,if i am way off here, sorry chaps.

 

Tony

The only thing I didnt check until today when driving back and the car kept on stalling in the middle of the road. :headvswal Loose connection to the PTU caused cylinder 1 to stop working. That worked fine but there is definitely a break in the wires which plugs up cylinder 6 as I found out when it stalled again and I was moving the wires about to find out why!

 

Thanks for the suggestions and help! I can now get back to putting my Z on the road to recovery and hopefully make sure she doesnt stall while driving! Imagine if that happened if I was on the motorway! :eek: :(

when it stalled, did you notice the rev counter going mad?

when it stalled, did you notice the rev counter going mad?

It just stalled. I noticed that the idling was a bit low and that if I drove normally then let go of the gas the rev would go down like usual but all the way down until it stalled.

 

I am sure there is a break some where with the loom as it is on off and was prob broken when I did the water pipes. I pretty much know where the break is now so it's just a matter of stripping the loom down and fixing it! :wack:

LOL i found it just easier to replace the whole engine loom with a brand new one lol.

 

Ivan

LOL i found it just easier to replace the whole engine loom with a brand new one lol.

 

Ivan

:tongue: I'm not planning to pull the engine out any time soon and getting a new loom seems a bit impossible! If I get round to rebuilding the engine then it'll be on my list of things to do. In the mean time she's working fine again! :dance:

Did mine with the engine in mate. Took about 4 hours I think.

 

Ivan

Did mine with the engine in mate. Took about 4 hours I think.

 

Ivan

That doesnt seem so painful then! I take it you did it from the inside out? Striped the interior out and went from there? If that's the case then I may actually consider doing it. Though the problem is still getting my hands on a new loom! And the cost of it. :wack: