P0303 cylinder #3 misfire
 

I just started experiencing a rough idle on my 2001 Cherokee (78k
miles). My engine light went on a little after that with the P0303
code. I just replaced the spark plugs, but that didn't help anything.
I was
thinking about changing the ignition coil or fuel injector. One other
possibility I was
thinking was checking the cylinder compression (maybe a gasket leak?).
Anyone have any suggestions?

Re: P0303 cylinder #3 misfire
 

01XJ wrote:
> I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?

http://www.obd-codes.com/trouble_cod...e-detected.php

For rough idle the first thing to do is clean the throttle body and idle air
passage. All it takes is some TB cleaner and an old toothbrush.

--
DougW

Re: P0303 cylinder #3 misfire
 

01XJ wrote:
> I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?

http://www.obd-codes.com/trouble_cod...e-detected.php

For rough idle the first thing to do is clean the throttle body and idle air
passage. All it takes is some TB cleaner and an old toothbrush.

--
DougW

Re: P0303 cylinder #3 misfire
 

01XJ wrote:
> I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?

http://www.obd-codes.com/trouble_cod...e-detected.php

For rough idle the first thing to do is clean the throttle body and idle air
passage. All it takes is some TB cleaner and an old toothbrush.

--
DougW

Re: P0303 cylinder #3 misfire
 

I had the same problem. Turns out on the 00's and 01's, there is a problem
with heat soaking into injector #3 and cuasing a misfire. The fix is a heat
wrap availible at the dealer for injector #3. I reset the code, replaced the
plug and and haven't had a problem since.

HTH

Carl


"01XJ" <adam.tsacoumangos@gmail.com> wrote in message
news:1167779855.090317.153570@v33g2000cwv.googlegr oups.com...
>I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?
>

Re: P0303 cylinder #3 misfire
 

I had the same problem. Turns out on the 00's and 01's, there is a problem
with heat soaking into injector #3 and cuasing a misfire. The fix is a heat
wrap availible at the dealer for injector #3. I reset the code, replaced the
plug and and haven't had a problem since.

HTH

Carl


"01XJ" <adam.tsacoumangos@gmail.com> wrote in message
news:1167779855.090317.153570@v33g2000cwv.googlegr oups.com...
>I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?
>

Re: P0303 cylinder #3 misfire
 

I had the same problem. Turns out on the 00's and 01's, there is a problem
with heat soaking into injector #3 and cuasing a misfire. The fix is a heat
wrap availible at the dealer for injector #3. I reset the code, replaced the
plug and and haven't had a problem since.

HTH

Carl


"01XJ" <adam.tsacoumangos@gmail.com> wrote in message
news:1167779855.090317.153570@v33g2000cwv.googlegr oups.com...
>I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?
>

Re: P0303 cylinder #3 misfire
 

With a misfire, I'd be looking at the plug wires or coil. I'd check plug
wires if there was a distributor, or I'd look at the coil if there was a
separate coil for each cylinder, or a coil for every two cylinders.



"01XJ" <adam.tsacoumangos@gmail.com> wrote in message
news:1167779855.090317.153570@v33g2000cwv.googlegr oups.com...
>I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?
>

Re: P0303 cylinder #3 misfire
 

With a misfire, I'd be looking at the plug wires or coil. I'd check plug
wires if there was a distributor, or I'd look at the coil if there was a
separate coil for each cylinder, or a coil for every two cylinders.



"01XJ" <adam.tsacoumangos@gmail.com> wrote in message
news:1167779855.090317.153570@v33g2000cwv.googlegr oups.com...
>I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?
>

Re: P0303 cylinder #3 misfire
 

With a misfire, I'd be looking at the plug wires or coil. I'd check plug
wires if there was a distributor, or I'd look at the coil if there was a
separate coil for each cylinder, or a coil for every two cylinders.



"01XJ" <adam.tsacoumangos@gmail.com> wrote in message
news:1167779855.090317.153570@v33g2000cwv.googlegr oups.com...
>I just started experiencing a rough idle on my 2001 Cherokee (78k
> miles). My engine light went on a little after that with the P0303
> code. I just replaced the spark plugs, but that didn't help anything.
> I was
> thinking about changing the ignition coil or fuel injector. One other
> possibility I was
> thinking was checking the cylinder compression (maybe a gasket leak?).
> Anyone have any suggestions?
>