Running on 5 cylinders intermittent RB20

[Michael1992]

Hey guys my rb20 is occasionally running on 5 cylinders . We pulled the plugs one seemed a little dirtier so I changed the coil pack and it ran on 6... Drove it for a day then on way home from work bang started on 5 again... Sometimes it would switch back and fourth from 5-6 but now it stays on 5.... So I changed the same coil pack out with another different one and it didn't change anything... Sooo I don't no what the problem is

[Voodoo_ChildR32]

Try swapping the ignitor.


Sent from my iPhone using Tapatalk

[Skym]

Coilpacks can fail due to incorrect sparkplug heatrange or sparkplug gap. If keeps happening, that's what I would check first, then igniton module via oscillioscope (ask a mobile auto electrician to check).

Also check the coilpack loom, as it's known to cause missing problems when gets older, hard (could be the pins inside the plugs). Injector loom causes similar problems. Change both (routine maintenance). Sometimes it can be faulty injector.

[A18]

Check the wiring to the coilpacks. If there's a bad connection then that would explain why it intermittently cut out. I had a similar problem and it ended up just being a dead wire.

[krystalized_jdm]

Re-read what you posted and realized what I posted was way opposite.

Look at my forum post on the same issue, hopefully something there will help.

[bobbo]

+1 for ignitor. I had the same issue.

[Michael1992]

it was the coil pack harness, there is 1 ground and another ground close to it. they were together and grounded to 1 location. for some strange reason we unhooked the 2 grounds and grounded 1 to igniter and other to firewall and bamm 6 cylinders. ****** eh?