P0420, p0301, p0304

[GCusdin]

Thought I would start from scratch.
Got code reader today and plug in to find the above.
301 and 304 misfire in 1 and 4
P0420 Catalyst System Efficiency Below Threshold (Bank 1)


What is the cat 1?
Is that my cat kaput or is this my 02 sensor playing up?
Is this what is causing the misfire or is this in addition to the misfire or is the because of the misfire?
Live data and freeze data I can put up too if it would help.
So far
Ignition coil changed
Plugs changed
Fuel Pump changed
FPR changed.


This has only been occuring since a water pump change of which the only thing removed was exhaust manifold

[Das]

Have you cleared the codes and re read them?

[GCusdin]

not since changing fpr.
Only just got this reader so just getting used to what I need to do

[Das]

Clear and re read, then see what the reader comes up with. Id have said the cat code is possibly a follow on from the misfire codes, one affecting the other IYKWIM?

[GCusdin]

Cleared codes and now nothing showing. No difference as misfire will still occur.
Freeze data gives me detail on misfire in cylinder 1

DTCFRZF	P0301
Fuelsys1	CL
Fuelsys2	N/A
LOAD_PCT (%)	65.5
ETC (F)	199
SHRTFT1 (%)	-2.3
SHRFT3 (%)	-100
LONGFT1(%)	-5.5
LONGFT3(%)	-100
MAP(inHg)	23.3
RPM(/min)	3434
VSS(mph)	46
FRP(PSI)	1337.2

Although I don't understand any of that it seems all sensors and fuel seem fine at misfire.
I do believe CAT is fine and just threw 420 up because of misfire.
Readings on idle if anyone understands these details

Idle
DTC_CNT	0
Fuelsys1	CL
Fuelsys2	N/A
LOAD_PCT (%)	12.2
ETC (F)	167
SHRTFT! (%)	2.3
SHRFT3 (%)	-100
LONGFT1(%)	-2.3
LONGFT3(%)	-100
MAP(inHg)	6.8-7.1
RPM(/min)	748-760
VSS(mph)	0
SPARKADV(0)	29
IAT(F)	52
MAF(lb/min)	0.287-0.295
TP(%)	2.7
02SLOC B1S12--B2S----02B1S2(V)	0.410-0.425
SHRTFTB1S2(%)	-100
OBDSUP	EOBD
MIL_DIST(MILE)	0
FRP(PSI)	690.7-746.9
EQ_RATB1S1	0.996-1.009
02B1S1(V)	1.498-1.532
EQ_RAT11	0.996-1.008
02S11(mA)	-0.078-0.023

[troutybrown]

If you've got a misfire then your not burning fuel properly