2005 Honda CRV Fuel economy

Hi carmanmt,

Resetting the PCM is not going to do any good.

I would suggest doing a tune up. Check the spark plugs, clean the throttle body and IAC valve and check ignition timing.

I checked the plugs and they appear ok.. cannot locate the IACV so if you know where that might be I could use a little help and not sure if the timing can be adjusted on these newer engines..

Thanks much..

Hi carmanmt,

HAPPY NEW YEAR.

No, ignition timing cannot be adjusted but it would give you an idea if anything is amiss, a fluctuating mark would mean the PCM is constantly tying to compensate.

After noting your mileage and doing additional research, if you are having idling speed fluctuations or erratic idling, then a computer relearn procedure might help.

PROCEDURE

1. Make sure all electrical items (A/C, audio, rear window defogger, lights, etc.) are off.

2. Reset the ECM/PCM with the HDS.

3. Turn the ignition switch ON (II), and wait 2 seconds.

4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194 °F (90 °C).

5. Let the engine idle about 5 minutes with the throttle fully closed.

NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.

KHLow2008, thanks I did the proceedure and will let you know the results..



HAPPY NEW YEAR.

No, ignition timing cannot be adjusted but it would give you an idea if anything is amiss, a fluctuating mark would mean the PCM is constantly tying to compensate.

After noting your mileage and doing additional research, if you are having idling speed fluctuations or erratic idling, then a computer relearn procedure might help.

PROCEDURE

1. Make sure all electrical items (A/C, audio, rear window defogger, lights, etc.) are off.

2. Reset the ECM/PCM with the HDS.

3. Turn the ignition switch ON (II), and wait 2 seconds.

4. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194 °F (90 °C).

5. Let the engine idle about 5 minutes with the throttle fully closed.

NOTE: If the radiator fan comes on, do not include its running time in the 5 minutes.[/quote]

Hi, I checked my mileage after the reset and I got 23.5, 21.3 and 21.. maybe that is it.. I'm just going by the rating of 22 city, 28 highway. my commute is 25 miles each way 7 of which is local then the remainder is turnpike...

Hi,

So the average is about as good as the initial and if you want it to increase it, try to accelerate gently. Some fuel saving driving methods would be necesary ;)