Hi Rev Misfire as in past 6k

Post by **Coops** » Sat Sep 06, 2008 8:31 pm

yeah agree mate,
safer that way also,
only an inlet gasket needed after all, and a bit of time
can inspect the cam lobes while im at it,

anyone know what the crane lifters are good for?

also how the hell can i tell if im getting valve bounce?

Eliot · Post by **Eliot** » Sun Sep 07, 2008 11:22 am

looking at the log, Lambda is steady during "misfire" - but then again i've never seen the lambda during a missfire - so may not help.

I dont think there's a vacuum leak - there's a variance at WOT, but not a leak. Also, no inlet restriction either, otherwise you would see the map dropping down to 95 or lower as the revs increase.

As an aside, your cruise inlet temps are high and take quite a while to drop, even then they are 38'c - which is high for n/a

I can see the lambda correction kicking in (-94 to +105) - worth disabling it as a test, but dont think thats your problem.

I assume we are disccussing this area:
http://homepages.nildram.co.uk/~eliotmez/capri.png
(may need to click on it to get it full size)

Ian Anderson · Post by **Ian Anderson** » Sun Sep 07, 2008 4:18 pm

Tony

Just a question why are you going above 6000 rpm

your max torque and max pawer were made well lower than 6000

You will not be getting any /much benefit for the extra rpm

Ian

Post by **Coops** » Sun Sep 07, 2008 4:57 pm

I know Ian,
but before the rolling road it reved past 6k,
now it isn't so i need to find out why before something fails big time,
don't want to be racing at the track on gas and something goes and the whole thing detonates

Post by **Coops** » Wed Sep 10, 2008 9:55 pm

right had a second opinion tonight,
took an friend for a run in the car and he recons its not a mechanical problem, but an electrical one,

SO, what could be failing at the same point every time?
and how can i test the cdi unti, and the coil?
is there a set resistance for the plug leads?
im now desperate to solve this fault, im still going to pull the lifters to check them and the cam lobes to be safe.

stevieturbo · Post by **stevieturbo** » Wed Sep 10, 2008 10:25 pm

Have you tried running just the dizzy/coil in a conventional manner ?

Post by **Coops** » Wed Sep 10, 2008 10:27 pm

thats the problem mate,
i can't
as the ecu runs on a hall trigger not vr,
so i cant connect the ecu up to just the coil with out the cdi unit,
the only other thing is fine someone else using a hyfire and get them to try my unit,

stevieturbo · Post by **stevieturbo** » Wed Sep 10, 2008 10:34 pm

So you actually have a different trigger inside the dizzy ?

Can you at least slap on a different coil ?

Even a normal electronic coil should work with the CDI unit.

If I was you...I'd be sorting a 36-1 trigger for the front pulley anyway. That would allow for fitment of a coil pack etc, plus a better triggering system, not reliant on the dizzy.

Although it may not cure the problem. It would open up other avenues for testing to try and eliminate it.

It really wouldnt cost much to sort it.

I might....and its a very big might....just have my old front pulley with the 36-1 fitted and bracket I used to mount my trigger.
This positioned a ford VR/meg sensor on the lower right of the pulley, at about 4-5 oclock when viewing from front, although it was combined with part of my PAS bracket.
Might be just as handy to make a new bracket.

If you had that as a trigger.....you could run a single coil/dizzy, the CDI as you are, a coil pack etc etc.

Post by **Coops** » Wed Sep 10, 2008 10:54 pm

i am thinking of going wasted spark mate,
but its getting my arse into gear and getting the parts sorted,
every time i get ready to start buying the parts something goes wrong,

be handy if you have the front pulley stevie,
if you find it pm me a price mate,

ramon alban · Post by **ramon alban** » Thu Sep 11, 2008 6:32 am

Tony, completely out of left field, If your system has a radio/tv interference suppression capacitor (condenser) usually across the coil, it may have changed value or be failing somehow. A capacitor's function is to resist voltage change, which just might be happening at your 6k region.

Apologies if this is rubbish.

ramon alban · Post by **ramon alban** » Thu Sep 11, 2008 6:39 am

ramon alban wrote: A capacitor's function is to resist voltage change, which just might be happening at your 6k region.

By the same token, withinn your ignition electronics or within the ECU trigger input circuits could there be a capacitor that is resisting voltage change at the mentioned rpm?

Post by **Coops** » Sun Sep 14, 2008 4:39 pm

thats why im after a possible circuit diagram of the unit so we can test it,

failing that im looking at going over to wasted spark and coil packs now,
so the ignition can be mapped also.

stevieturbo · Post by **stevieturbo** » Sun Sep 14, 2008 8:05 pm

I cant find my front pulley......

Post by **Coops** » Sun Sep 14, 2008 9:01 pm

ok stevie, ta for looking mate.

bones · Post by **bones** » Sat Sep 20, 2008 11:16 pm

not that i know much about it, but it sounds electrical as it seems to be pretty consistent at 6k, does the nos controller come on when you put on the iignition and has it got a limiter built in,

rich