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R32 Running On 4 Or 5 Cyl

murrayis

By murrayis,
in General Maintenance

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murrayis Mentor

murrayis

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Well I finally got my stroked rb20 running yesterday but as soon as it started could hear she wasn't firing on all cylinders, We tested the injectors there all clicking away, took annd the coilpaks out and earthed them all with the plus in them and spun the CAS and they all spark.

I am stuck for ideas why its not running correctly, can anyone shed any light on why or what could be causing this to happen ?

Cheers

Cameron

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murrayis Mentor

murrayis

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Igniter? coil harness?

Did you unplug each coil one at a time to narrow down which cylinders weren't firing?

Of course Bubba,

Tried each injector, and each coil pack on top of the engine and they all sparked.

Number 3 isn't firing whilst unplugging while running the engine.

GTScotT Grand Master

GTScotT

Posted
Posted
Yes but they all don't cover all the injectors working fine and all the coils sparking and all brand new plugs and it still does it.

is the spark a good spark or just a spark, as if the coils are worn or the harness is stuffed they will still spark yet not properly, also have you checked the timing?

murrayis Mentor

murrayis

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Coils are brand new used them for all of 1km driving before the engine came out. I am thinking its in the harness or the ignitor I had a quick search but is there nay way to test the ignitor?

Timing is spot on the mark.

blind_elk Grand Master

blind_elk

Posted
Posted
Yes but they all don't cover all the injectors working fine and all the coils sparking and all brand new plugs and it still does it.

The principles are the same.

Number 3 isn't firing whilst unplugging while running the engine.

If #3 isn't working, then they are not "all fine". To repeat the several squillion threads, it's simply a matter of moving / swapping component locations to determine which part of the system is kaput.

murrayis Mentor

murrayis

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And to add, We have switched the coilpacks around and the problem stay on number 3, we have also switched the injectors around.

I have read countless threads where Coilpacks are stuffed or sparkplugs are fouled up..

This case is different, I have even tried 3 sets of brand new spark plugs, 2 sets of coppers and 1 set of iridium's

We tested all the coilpacks at once but earthing them all along the top of a peice of steel earthed ot the car all of them fired when rotating the CAS, we did similar with the injectors only plugging one in at a time and spinning the CAS they all make the clicking sound when they fire.

I wouldn't of made a new thread if this was like the "squillion other thread"

The things I am yet to try is a different ignitor and different harness but have tested continuity from the ecu harness to the engine bay and all check out fine even while jiggling the harness looking for loose or broken connections.

blind_elk Grand Master

blind_elk

Posted
Posted
And to add, We have switched the coilpacks around and the problem stay on number 3...
We tested all the coilpacks at once but earthing them all along the top of a peice of steel earthed ot the car all of them fired when rotating the CAS,
These 2 statements don't correlate. Either they all work, or #3 has a problem. Which one is it?
murrayis Mentor

murrayis

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Yes, This is why I don't know why its not firing... They all sparked yet when you run the engine number 3 doesn't fire this is my problem.

Understood that if the coilpack didnt make spark to try another and see if it sparks, but what happeneds if it does spark? and changing to another coilpack still provided the same spark yet when its all on the engine it doesnt fire it?

blind_elk Grand Master

blind_elk

Posted
Posted

Ok, so while you are testing the coils, they are at a different angle to when they are "installed". That might suggest a fault in the wiring to #3 coil. Have a play with the wiring to the coil while the engine is running, see if that has any effect.

murrayis Mentor

murrayis

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Ok well, Seem to have found the problem being the number 3 injector... I took it out because it wasnt functioning.. put 12v on it no clicks... tapped it a few times tried 12v again and it started to click again. Hopefully when I put it back together it all works fingers crossed

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