New Plugs And Coils Car Not Running Right

[polzin]

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]

Could be the loom.

Could also be a lot of other things....

What boost are you running?

Ecu?

Ever had injectors cleaned or replaced?

Fuel pump and filter?

Boost leaks?

[Ben C34]

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.

[Badgaz]

bpr5? thats quite a hot plug is it not? anyway.... how do you know 3 and 6 aren't firing?

[polzin]

wass running fine when i got home stranded boost stranded ecu stock injectors been clean new fuel pump and filter no boost leaks

[polzin]

sorry its bcpr7es-11

[Badgaz]

check to ensure you coil springs are there...and the loom like ben said.

[polzin]

i go double check now

[Ben C34]

sorry its bcpr7es-11

Don't be sorry. Just don't lie to me again

[polzin]

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

[Ben C34]

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.

[Ben C34]

You never mentioned what coils. Maybe they are dud?

[polzin]

there new oem ones its dark out side now and i have no light so i will have to continue this on the weekend after work

[Ben C34]

Actual oem or eBay "oem quality"?

[polzin]

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?

[Ben C34]

It wouldn't reach the wrong coil.

[polzin]

found the problem i think found the new plugs cracked going to get some more this week see how this plays out

[75coupe]

New plugs are crack?

You know you dont have to do them up ultra tight yeah?

Must of cracked putting them in

[Guilt-Toy]

yeah he cracked them putting them in... his car is all good now...

[MJTru]

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.