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Funkym ... 3/1/2020

2009 Honda Accord EX-L 6 Cyl 3.50L


Freeze Frame Data Diagnostic Help

I am hoping you can help with the following:
Vehicle: 2009 Honda Accord V6, 124k miles; purchased at 110k miles 1 year ago. Intermittent P0301 & P0303 DTCs. Rough idling with fluctuating RPMs, excessive coolant use (reservoir Full to Empty in 1 year/14k miles), black build-up on tailpipes (worse on passenger side), low horn note randomly stopped working, possible decrease in fuel economy.
I am in need of help with interpreting the following freeze frame data:
LOAD_PCT (%): 13.7
ETC (°F): 176
SHRTFT1 (%): 11.7
LONGFT1 (%): 7.0
SHRTFT2 (%): 5.5
LONGFT2 (%): 2.3
MAP (in Hg): 7.4
RPM (/min): 653
VSS (mph): 0
SPARKADV (°): 10
IAT (°F): 91
MAF (lb/min): 0.388
TP (%): 14.1
RUNTM (sec): 991
EGR_PTC (%): 0.0
EGR_ERR (%): 99.2
EVAP_PCT (%): 11.4
FLI (%): 30.6
BARO (in Hg): 28.9
VPWR (V): 14.027
LOAD_ABS (%): 14.7
EQ_RAT: 0.990
TP_R (%): 3.1
TP_B (%): 31.4
APP_D (%): 19.6
APP_E (%): 9.4

1 Answer


Jimm 3/1/2020

P0303 = Cylinder #3 Misfire

A code P0303 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


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