P0302 (Cylinder 2 misfire)

Got the above code on my Kia 2008 Rondo 6 cyl. 2.7 liter engine. Car runs crappy!

I will diagnose the problem, HOWEVER, does the computer shut down the fuel to cylinder 2 because it is misfiring? When I had this trouble with my Chevy Silverado 5.3 liter (bad spark plug wire), replacing the wire did not solve the problem since the computer shut the cylinder down. This makes diagnosis very difficult (cannot simply swap wires, spark plugs or coils). If this is the case does anybody know how to 'reset' the computer. I know how to erase the code but I don't think that is the same thing.

All replies appreciated,

Ivan Vegvary

Computers don't "shut cylinders down" when there is a running problem.

On 01/14/2012 05:49 PM, wrote:
> Got the above code on my Kia 2008 Rondo 6 cyl. 2.7 liter engine. Car
> runs crappy!
>
> I will diagnose the problem, HOWEVER, does the computer shut down the
> fuel to cylinder 2 because it is misfiring? When I had this trouble
> with my Chevy Silverado 5.3 liter (bad spark plug wire), replacing
> the wire did not solve the problem since the computer shut the
> cylinder down. This makes diagnosis very difficult (cannot simply
> swap wires, spark plugs or coils). If this is the case does anybody
> know how to 'reset' the computer. I know how to erase the code but I
> don't think that is the same thing.
>
> All replies appreciated,
>
> Ivan Vegvary

the computer doesn't "shut down" the cylinder permanently, only when it
determines that it's not firing. try new plugs and see what happens.

and buy an obd reader. it'll allow you to reset the codes.


--
nomina rutrum rutrum

"no way" wrote:

> Computers don't "shut cylinders down" when there is a running problem.

Tell that to the Jeep Grand Cherokee sitting outside our shop.

Testing shows the injector gets its firing pulse until the number of misfires
hits 200 or so, then the signal is cut off, and the "misfire" code is set.
The cylinder is then "dead" until the code is cleared, and it starts all over.

On 01/15/2012 05:18 PM, Sanity Clause wrote:
> "no way" wrote:
>
>> Computers don't "shut cylinders down" when there is a running problem.
>
> Tell that to the Jeep Grand Cherokee sitting outside our shop.
>
> Testing shows the injector gets its firing pulse until the number of misfires
> hits 200 or so, then the signal is cut off, and the "misfire" code is set.
> The cylinder is then "dead" until the code is cleared, and it starts all over.
>
>

it should be a temporary shutdown, not permanent. as you say, it should
count a number of no-ignition events, then quit injecting to save
emissions and the catalyst. but it should also re-test periodically too.


--
nomina rutrum rutrum

"Sanity Clause" > wrote in
:

>
> "no way" wrote:
>
>> Computers don't "shut cylinders down" when there is a running
>> problem.
>
> Tell that to the Jeep Grand Cherokee sitting outside our shop.
>
> Testing shows the injector gets its firing pulse until the number of
> misfires hits 200 or so, then the signal is cut off, and the "misfire"
> code is set. The cylinder is then "dead" until the code is cleared,
> and it starts all over.
>
>


Protection for the cat, evidently. Seems like a sensible approach to me.


--
Tegger

wrote in
news:13016753.1083.1326592142437.JavaMail.geo-discussion-forums@proa7:

> (cannot simply swap wires,
> spark plugs or coils).



That's not what a misfire code is telling you to do.


--
Tegger