I've got my exhaust finished so I've been running the car a bit recently. After a 5 min run I tested the exhaust pipes to see if they were all hot. All were except number 1 cylinder. Bit odd I thought... maybe an injector isn't working, swapped two of them around and the same result...

So i hooked up the timing light to the number 1 HT lead and no light :S Then I checked the other leads... only two of them gave flashing light :/ Why is that? Is that a bad way to check spark then? I must be getting sparks on cylinders 2,3,4,5 & 6, I could fry my breakfast on those cylinder's pipes.

Why wouldn't I be getting a spark on number 1? I was doing when I tested it with the plugs out. I guess tomorrow I'll pull No 1 lead out and hook it up to an old spark plug and hold it against the block. If I'm still not getting a spark what could be the problem? b0rked EDIS6? Edis wired wrong?

Not likely to be the edis or it's wireing - either of those would knock out two cylinders since it's a wasted spark setup .
I'd guess it's a dead plug , or faulty lead .

As the coil fires as 3 sets of 2 (wasted spark) then suspect the actual lead or the plug itself.

Have you tried turning the clip the other way around on those leads? (assuming your using induction clip timing light) The current runs the other way in one lead in each pair and some clips don't work the wrong way around.

adrian

I'd vote for a dead lead or a poor connection at one end.....

quote:

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Originally posted by Benzine
maybe an injector isn't working, swapped two of them around and the same result...

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I just swapped the injectors over, wires the same

Are you running an EDIS style ignition system with wasted spark?

Do you have a timing light that loosly clips over the ignition lead?

If the answer is 'yes' to both questions, try ignoring the little arrow on the timing light clip (the one they tell you should point towards the plug) and put on the clip the other way round (pointing to the coil). You may be pleasantly surprised!

This happened to me - the engine was running really well, but I wanted to check the timing. Clipped on, and got a really poor flash. Did all sorts of nonsense, then accidentally fixed the clip the wrong way round. I then got a really steady and strong flash!

As adithorp says, try it the other way.

I just tried swapping the clip round as you both suggested and yes it works So I'm getting good signals. I also tried the No 1 injector wire on number 2 injector and that works so injector wiring is fine. Guess next thing to check is the spark plug itself

Update: All working now

One of the electrodes on the plug was touching the main body (completing the circuit without a spark). I guess I must have dropped it in and then tightened it up while it was still bent.