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-   -   P0302 Cylinder Misfire in #2 on Wrangler '11 (https://www.jk-forum.com/forums/stock-jk-tech-12/p0302-cylinder-misfire-2-wrangler-11-a-349681/)

hynesy 03-16-2019 05:31 PM

P0302 Cylinder Misfire in #2 on Wrangler '11
 
Hi all,
First time posting! Had a CEL came on a couple of days ago at the same time the low fuel light went on. Checked the code and it's a P0302, it's a 2011 Wrangler Sport (petrol) with 86000 km on it. I've done a bit of reading on these forums and it's clear it could be caused by a number of different parts , the car seems to be running well, idling at around 600RPM, no noticeable loss of power, no spluttering, very occasional light shudder on idle but I can't tell if that's normal (and I'm just being paranoid) or not.

I think I'll start with the spark plugs then the spark plug leads because it sounds like that is a good place to start.

Does anyone have any thoughts on this?

Cheers,
Dave

dmwil 03-17-2019 05:19 AM


Originally Posted by hynesy (Post 4338208)
Hi all,
First time posting! Had a CEL came on a couple of days ago at the same time the low fuel light went on. Checked the code and it's a P0302, it's a 2011 Wrangler Sport (petrol) with 86000 km on it. I've done a bit of reading on these forums and it's clear it could be caused by a number of different parts , the car seems to be running well, idling at around 600RPM, no noticeable loss of power, no spluttering, very occasional light shudder on idle but I can't tell if that's normal (and I'm just being paranoid) or not.

I think I'll start with the spark plugs then the spark plug leads because it sounds like that is a good place to start.

Does anyone have any thoughts on this?

Cheers,
Dave

I've never had that code, but like you, that's where I'd start. You might even ask your dealership. They may know the cause to be a common issue and might help steer you in the right direction. I've had vague codes twice that didn't really tell me much. One led to a new catalytic converter and the other to two new O2 sensors.

hynesy 03-17-2019 06:10 PM


Originally Posted by dmwil (Post 4338217)
I've never had that code, but like you, that's where I'd start. You might even ask your dealership. They may know the cause to be a common issue and might help steer you in the right direction. I've had vague codes twice that didn't really tell me much. One led to a new catalytic converter and the other to two new O2 sensors.

After speaking to a mate who knows a bit more he suggested I do the following:
  • Check distributor cables/ignition wires are properly connected
  • Check air intake/filter
  • Check spark plugs and visually inspect for dirt/grime, etc
  • Take distributor cap head off and visually inspect for dirt/grime, etc
  • Test distributor cable
I'll post how I go here in case it comes in handy for others.

Cheers,
Dave

hynesy 03-18-2019 01:38 AM


Originally Posted by hynesy (Post 4338253)
After speaking to a mate who knows a bit more he suggested I do the following:
  • Check distributor cables/ignition wires are properly connected
  • Check air intake/filter
  • Check spark plugs and visually inspect for dirt/grime, etc
  • Take distributor cap head off and visually inspect for dirt/grime, etc
  • Test distributor cable
I'll post how I go here in case it comes in handy for others.

Cheers,
Dave

I checked the air filter and it had a bit of debris in it, along with being dirty. I've attached a photo of it after I gave it a clean, does it need replacing? When I checked the misfire stays they seemed to have reduced a little with the clean, also noticed a single misfire in #4, not enough to trigger a CEL tho.
https://cimg6.ibsrv.net/gimg/www.jk-...7a2ec19b5e.jpg

What do you think?

hynesy 03-18-2019 04:37 AM

Sorry to bump this again, but I've had this CEL on for a few days but I'm planning to take it in on Friday (4 more days) as I think I have reached the limit of my skillset. Do you think that will be ok (i.e. won't cause any permanent damage) to wait until then?

smiller 03-18-2019 06:50 AM

P0302 is a cylinder 2 misfire and could be due to anything causing low power in that cylinder, most often ignition-related but could be a fuel injector or something else. If the engine seems to be running fine otherwise I wouldn't worry about driving it until your service appointment.

hynesy 03-19-2019 11:33 PM


Originally Posted by smiller (Post 4338278)
P0302 is a cylinder 2 misfire and could be due to anything causing low power in that cylinder, most often ignition-related but could be a fuel injector or something else. If the engine seems to be running fine otherwise I wouldn't worry about driving it until your service appointment.

Thanks Smiller!

i did my best to clear the dust and leaves from the filter, firmly pushed in both ends of the spark plug cable and the CEL has gone off after a couple cycles, suspect that's not the last I'll see if it though.

There is no perceivable (to me) performance impact so I'm not super concerned at this stage.

Cheers,
Dave


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