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Old 01-14-2010, 12:36 AM   #1
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Icon6 Why does my RPM jump up and down?

Hi. So I recently got my first car and noticed as I'm in neutral going down hill the RPM would jump up and down and seems to stop as I'm braking and stop. What should I do? Oh I forgot to mention I have a 93 Civic HB VX D15Z1.

Thanks.
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Old 01-14-2010, 12:56 AM   #2
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Default Re: Why does my RPM jump up and down?

it sounds like an IACV issue are there any check engine lights??
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Old 01-14-2010, 01:19 AM   #3
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Default Re: Why does my RPM jump up and down?

yes I had this same problem when at idle on a d16 - it turned out to be the idle air control valve.
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Old 01-14-2010, 03:54 AM   #4
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Default Re: Why does my RPM jump up and down?

No engine check light.

I'm very new to this so will this be an easy quick fix? What do I need to do to fix my IACV?

Thanks for the quick response.
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Old 01-14-2010, 06:26 AM   #5
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Default Re: Why does my RPM jump up and down?

If it is the IACV, you can try cleaning it before replacing. Just follow this guide: http://www.honda-tech.com/showthread...+control+valve
Had to do this for my eg.
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Old 01-14-2010, 07:37 AM   #6
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Default Re: Why does my RPM jump up and down?

IACV most likely, and on rare occasions it could also be the TPS but most likely your IACV needs to be cleaned.
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Old 01-14-2010, 07:41 AM   #7
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Default Re: Why does my RPM jump up and down?

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Originally Posted by niwisball3r View Post
No engine check light.
Does the CEL work?
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Testing Fuses...Fuse 15 TSB...Cleaning the IACV or FITV

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Old 01-14-2010, 08:12 AM   #8
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Default Re: Why does my RPM jump up and down?

This happened to me too. But it was the speed sensor.
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Old 01-14-2010, 09:07 AM   #9
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Default Re: Why does my RPM jump up and down?

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IACV most likely, and on rare occasions it could also be the TPS but most likely your IACV needs to be cleaned.
bingo....
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Old 01-14-2010, 12:14 PM   #10
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Default Re: Why does my RPM jump up and down?

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Originally Posted by 95_Civic_4dr View Post
If it is the IACV, you can try cleaning it before replacing. Just follow this guide: http://www.honda-tech.com/showthread...+control+valve
Had to do this for my eg.
I'll give this a shot today and let you know how it goes. Once I clean the IACV and doesn't seem to do the job, does that mean I need to replace it?

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IACV most likely, and on rare occasions it could also be the TPS but most likely your IACV needs to be cleaned.
I'm very new to all this, so what is a TPS?

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Originally Posted by RonJ@HT View Post
Does the CEL work?
Yea. My wording was a little off to make it sound like the light wasn't working, but would the CEL turn on with my RPM problem?

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Originally Posted by JDM_Dream View Post
This happened to me too. But it was the speed sensor.
How'd you know it was your speed sensor?
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