1uz firing order

[stradlater]

Nah dude, wastespark doesn't work like that...

It fires in this example 1 and 6 at the same time, twice per cam revolution, because at the start of the cam revolution cylinder one is at it's compression stroke, and then half way through the cam revolution 6 is at it's compression stroke.

Meaning, they are both TDC twice in a revolution, just one is on compression the other is empty.

[mick08]

I see, so what are you using to tell the ecu where the cam /crank relationship is? are you using the orig crank angle sensor?

[stradlater]

Sorry to be a smart arse, but this is for clarification.

A wasted spark is when in an ignition system in a four-stroke cycle internal combustion engine spark plugs fire in pairs, on both the exhaust and compression strokes. The extra spark on the exhaust stroke has no effect and is thus "wasted".

[AL510]

If 1 and 6 are at tdc then the rest must be paired as you stated, which makes sense.If that is the way you have hooked them up it must be another prob.
One thing to check is have you connected number 1 chanel ignition with number 1 and 6 then number 2 driver with 8 and 5 or did you go with cyl 2 and 3?. some ecu are configerable to firing order and some you have to hook up in there firing order.eg on a four pot with 1342 order you would connect number 1 driver with number 1 cylindar then number 2 driver with number 3 cylindar not number 2 cylindar.If that makes sense.

Cheers, Al.

[stradlater]

Nope, it's a combination of the two cam angle sensors, but it's a complete custom job.

Custom hall effect sensors were made with discs machined up with teeth on them to show the cylinder locations.

One has 8 teeth, the other (home) has one.

I'm starting to think that it's just bad spark plugs at the moment, given the fact that it nearly started a few times tonight.

Also, it could be cross-fire between the leads.

[mick08]

I had a set of custom ign leads made up for my old torana that was running a 400 small block,they were 10.5mm leads and i watched the bloke make the whole set from the same roll of cable,after many months of chasing a problem with the ign, i happened to check the resistance of the coil lead when it was hot, it seemed that the resistance was fine when it was cold but only when it was a certain temp the resistance would grow, 10mins of driving and the miss and the greater resistance were gone car would run fine, guess what i'm tryin to say is the resistance can change with temp, there was no physical damage to the lead, the resistance value was pretty irelevent as long as the longer leads had twice as much resistance as the shorter leads, i have seen people put a timing light on each individual lead at a time and just watch the pattern of the light as a quick check to how the lead is firing .

[stradlater]

good thinking, I"ll check that one out too, given that there are some long leads here...