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New Plugs And Coils Car Not Running Right

polzin

By polzin,
in Engines & Forced Induction

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polzin Enthusiast

polzin

Posted
Posted

ok so i put new coils on last week and worked awesome still had some spark breaking down issues but not as bad today i put in new plugs BPR5ES gap down to 0.7 now i put it all back together and fire it up it seems to be not firing on 3cyl or 6cyl i double check loose connections now i am lost :/

Ben C34 Grand Master

Ben C34

Posted
Posted

And after rereading your post, you disturbed the loom and it got worse, so that seems to point to the loom.

Is 5 heat range stock? That's a pretty hot plug. I use 7 heat range, most guys say go with 6 or 7. Not 5.

Ben C34 Grand Master

Ben C34

Posted
Posted

how i check them was pull each connetor of one at time to here to miss

That's the smart way to do it.

You can then swap coils and see if the miss moves, letting you pinpoint coil or loom.

polzin Enthusiast

polzin

Posted
  • Author
Posted

i got them off a member off here there is spark in cyl 3 going to test cyl6 after work i got a feeling it may be a boost leak but i think maybe the coil loom is on its way out so ill just pull it all apart again tomoz and see how i go with it all just a sill question say if i a plug the loom wrong like had one swapped around will this cause a miss?

MJTru Mentor

MJTru

Posted
Posted

What you might want to do is a compression test on all cylinder. After that's Ok. Take out all the coil packs and unplug them along with the injector harness. Then remove the CAS sensor and test by plugging in one coil at a time from any cylinder. Let's say number one. Turn the CAS sensor clockwise with the ignition key on holding the coil with spark plug in it . You will see the spark plug fire. That ecu channel would be good and coil and plug would be good as well if spark is present. Repeat this on all coil and ecu channels. You can use this method for injectors, but a noid light would be safer and easier. I have had this happen to me and it was the plug on the ecu.

Hope it helps mate.

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