2005 Honda CRV Fuel economy

Tiny
CARMANMT
  • MEMBER
  • 2005 HONDA CRV
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 19,500 MILES
Hi, I have a HondaCRV and it was averaging 22 to 23 mpg and recently it has slipped to around 19 with the same driving conditions. I replaced the air filter, no check engine light, just seems odd that it would lose fuel economy like that, although not a lot, but it is noticable. I live in the Philade;phia suburbs, so was thinking it could be the winter fuel mixes here, but it didn't do it last year.

Anyone ran into this before? Someone told me to reset the computer, but not too sure if I want to mess with that.

Any suggestions would be appreciated.
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Monday, November 24th, 2008 AT 8:46 PM

6 Replies

Tiny
KHLOW2008
  • EXPERT
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.
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Tuesday, November 25th, 2008 AT 7:26 AM
Tiny
CARMANMT
  • MEMBER
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.
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Thursday, January 1st, 2009 AT 8:43 AM
Tiny
KHLOW2008
  • EXPERT
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.
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Thursday, January 1st, 2009 AT 3:56 PM
Tiny
CARMANMT
  • MEMBER
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]
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Wednesday, January 7th, 2009 AT 4:52 PM
Tiny
CARMANMT
  • MEMBER
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.
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Monday, January 19th, 2009 AT 9:58 PM
Tiny
KHLOW2008
  • EXPERT
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 ;)
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Tuesday, January 20th, 2009 AT 8:14 AM

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