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Discussion Starter · #1 · (Edited)
P0304 on 2012 Veloster non-turbo.
Very rough idle, hesitant when gas pedal pressed, sometimes hard to start, sometimes bad on mpg, and rpm surge ranging from 500 to 750 rpm when at idle, feels like car wants to stall unless I add gas.
Swapped out old spark plugs for new ones, did GDI cleaner twice separate times and a lot of carbon build up came off through black smoke on exhaust, checked and swapped coils to different slots with no changes to P0304. Changes air filter, cleaned throttle body as well.
Next move is to replace MAP sensor, keep seeing those go bad frequently. Have not looked at fuel injection system but will soon.
Only have a simple OBD2 scanner with free frame data as follows:

DTCFRZF P0304
FUELSYS1 CL
FUELSYS2 N/A
LOAD_PCT% 53.3
ETC F 178 DEGREES
SHRTFT1% -5.5
LONGFT1% -3.1
MAP 15.4
RPM 709
VSS MPH 0
SPARKADV -3
IAT F 75 DEGREES
TP % 12.9
RUNTM SEC 154
FRP PSI 580.2
EVAP_PCT% 0.0
FLI% 76.1
BARO 24.8
VPWR V 12.745
LOAD_ABS% 39.1
EQ_RAT 0.999
TP_R% 3.5
AAT F 73
TP_B 12.9
APP_D% 14.9
APP_E 14.9
TAC_PCT% 4.7

Anything else anyone recommends?
Thanks!
 
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