Hello Guys,

I had a civic manuel 01 EX model. I use to drive 80 km/hr at 2000 rpm.

My bro has a civic 04 manuel and it drove 80 km/hr at 2500 rpm.

Normally the gear ratio between the 2 should be the same.

Is it normal that there is a change in the RPM as the 04 is consuming a little more fuel.

Thanks in advance.

 

Your brothers Civic seems more accurate than your recollection.

I have an '02 EX with a manual transmission. In 5th gear and at 60 MPH - it is at approximately 2800 RPM. (between 2700 and 2800)

So, 2500 at 50 MPH (or about 80km/h) is what I would consider normal.

 

Hi It Wasn't Me,
Is your car modified one or running on stock ?

One more thing i have noticed is when running on idle, sometimes the rpms rises from 800 to 1100 all of a sudden and goes back to 800.

 

When I did the RPM test it was done with stock wheels and tires. Here's the old thread about it. https://honda-tech.com/forums/honda-civic-2001-2005-78/ex-automatic-vs-manul-transmission-2667290/

Start with inspecting/cleaning your IACV (Idle Air Control Valve) and doing the Idle Relearn. Also check for vacuum leaks around the intake.
Here's a thread showing just how nasty they can get. https://honda-tech.com/forums/honda-civic-2001-2005-78/throttle-body-clean-up-honda-civic-2001-ex-2608248/

Idle Relearn summarized:
Disconnect the battery, or remove fuse #6 out of the fuse box under the hood. Wait 30 seconds, then reinstall (or reconnect) it.

- Turn everything electrical OFF. (radio, wipers, a/c, lights, etc etc)
- Start the car and hold the idle at 3,000 RPM until the radiator fan comes on, or until the coolant has reached 194° F.
- Take your foot off the accelerator and let the car idle for five minutes. (if the radiator fan comes on, do not include its run-time in the five minutes)





If none of those do any good, update your thread.