2000 Honda Accord

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#1
I have a 2000 honda accord 2. 3L 4cyl that occasionally has a hard time idling and when stepping on the throttle the engine stumbles and appears close to stalling when trying to move. While driving, the engine will occasionally stumble a bit. This has been going on for the last several of years, but when I replace the cap and rotor it seems to go away for about 1. 5 years

Now the vehicle seems to be having the same issue, except a MIL is displayed with the P0172 code. I replaced the cap and rotor, and it appears the idle is better, but the engine still stumbles on medium and higher loads. Any idea on how to help close this issue?
 

Paul

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#2
How many miles are on the vehicle?If PO172 is the only code stored I would check to see if the O2 sensor is functioning properly.Are you using Honda parts?
 
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The car has about 120k, and it is the original O2 sensor. I am using autozone cap and rotor. The problem is seeming to get worse. I can achieve only about 10% power, anytime I press the accelerator over this amount the engine stumbles and bogs down. I pulled my spark plugs, and they were black. I changed them and I get a lot more power but it still stumbles and bogs down (it is just closer to 70% power. ) So it does appear that I am running a little rich, so how can I tell if it is the 02 sensor? Could it also be a fuel pressure regulator?

-jm
 

Paul

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#4
I found a TSB that MAY be whats wrong with your Accord engine.I would remove the vacuum line to the regulator and see if there is any fuel present.Look for any signs of moisture.An failed O2 sensor will not cause the engine to run that rich.

Applies To:
1998-00 Accord L4 - See VEHICLES AFFECTED

MIL Comes On With DTCs P0171 and/or P0172
(Supersedes 00-018, dated March 14, 2000)

SYMPTOM

The MIL (Malfunction Indicator Lamp) comes on with DTCs P0171 (Fuel System Too Lean) and/or P0172 (Fuel System Too Rich) stored in the ECM/PCM.

PROBABLE CAUSE

Moisture in the fuel pressure regulator.

VEHICLES AFFECTED

1998-99 2-door: ALL

1998-99 4-door: ALL

2000 2-door:From VIN 1HGCG3. . .YA000001 thru YA000919

2000 4-door:From VIN 1HGCG6. . .YA000001 thru YA002332
From VIN 1HGCG5. . .YA000001 thru YA012613
From VIN JHMCG5. . .YC000001 thru YC000015
VIN JHMCG6. . .YC000001

CORRECTIVE ACTION

Replace the fuel pressure regulator, and reroute the fuel pressure regulator vacuum line.

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