I have a Honda Accord 2000 LX-V6 that's having P0300, P0301, P0303, P0304, P0306 codes. The car currently has 130,000 miles.

I have checked and done the following steps:

1) Ignition system:
- spark plug coils: All 6-coils were replaced (less than 7000 miles of driving).
- spark plugs: Six new Champion platinum spark plugs (14000 miles of driving)

2) EGR
- Removed Intake manifold and cleaned up EGR passage and EGR valve when the P0401 check engine light on before.

3) Air leak:
- Checks all the hoses, and see no signs of air leak.

4) Fuel pressure:
- Fuel injector: The resistance I measured on all six fuel injectors are very similar.
- The misfires are on cylinder 1,3,4,6. Could the fuel pressure, fuel pressure regulator causing the problem?

I took some of the readings from my ODB-II scanner when the engine is idle, and here are the numbers:

Load_Pct: 29.4G
ECT: 69
SHRTFT: 3.9
LONGFT: 6.3
MAP: 29
RPM: 745
SPARKADV: 10.5
IAT: 25
TP: 9.8
O2B1S1: 0.25
SHRTFTB1S1: 3.1
O2B1S2: 0.095
SHRTFTB1S2: 3.1

Can anyone share some of their experience or insightful info? or if someone have had this problem before, can you share the info?

Thanks

 

Im having similar issues with my 03 I've done pretty much all the above mentioned I'm suspecting bad fuel pressure regulator since it's on pump and I'm not sure of a way to accurately test it I went ahead and bought a new one it will be here tomorrow so I will let you know if it fixes my problem I have a similar thread if you want to check to see if maybe any responses there may help ...if anyone knows if there's a way to test the on pump regulator I'll chexk it out