Bah!

 

Just drove to work this morning and the car was idling very rough. It seems like it's not firing on all cylinders (The engine is wobbling like mad).

 

I spotted a small fuel leak next to that fuel damper thingy - I ordered a new one of those yesterday along with a fuel regulator.

 

Could that have corroded some of the connectors? I tried wiggling some connectors round under the bonnet but it hasn't helped.

 

What do I do from here? How do I isolate what's causing this?

 

What a crap start to the day!

The easiest way to isolate what cylinder isn't firing (if indeed one isn't firing) is to, one by one, pull the connectors that go into the coil packs. Whichever cylinder does not cause a momentary drop in RPM when disconnected, is the one that wasn't firing.

 

Which will either be coilpack/connection, injector/connection or theres a smaller chance, PTU..

 

Pull the connectors off, and clean them up with a small strip of sandpaper on the end of a screwdriver, and see if that helps..

 

Az

John - can you please tell me where you are ordering the fuel damper & pressure regulator from and for how much? Mine are on their way out and I'm on the look out to order some.

 

Cheers fella!

 

Danny

Hi Danny,

 

You can get the fuel damper and regulator from courtesy in the states:

http://www.courtesyparts.com/z32/z32_oem_popular-fuel.html

 

Their pricing is very good compared to buying over here!

This misfire is *proper* annoying. It disapeared at lunchtime today - the only time of the day when I could possibly get time to test it. But now, it's time for me to drive home and yes, it's back.

 

Arrrgh!

 

I'm gonna go over it on the weekend and do a compression test too. I suspect it's probably one of the injectors because if the dodgy cylinder was getting fuel but no spark then if it misfires for a while the cat overheat light would come on, is that correct?

 

I've ordered new connectors for nearly everything, as most of the coil-pack connectors, injector connectors, etc. disintegrate upon touching them (The plastic clip thing on one literally turned to dust).

 

I hope this is just an electrical problem and nothing nasty!

If it's misfiring and then the cat light comes on it could be because fuel is being blown down into the cats which is then burning and making them overheat. That would lead me to think of an ignition problem rather than an injector.

You sure that the leak near the fuel damper is not the pipe underneath it that goes down to the injector rail? Thats what was leaking on mine. The damper and FPR were fine.

 

As the pipes age the rubber shrinks and harden and leaks at the joint when its cold.

A re tighten can be enough to fix it for now but you have to take off the Nissan 3000 trim plate on top of the engine to get at the screws under the FPR.