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Old 09-18-2012, 08:29 AM
jdmorg jdmorg is offline
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Surging Idle?

I've done a couple of quick searches with no luck. I'll try some more terms, but in the meantime, figured I'd throw it in a thread.

1999 Accord Sedan
J30A1 (V6)
Auto. Trans.

The car's idle is acting up. When it's cold...no issue. It starts when the engine is warm and the idle surges about 500rpm, up and then down, up and then down. It stops once the engine is under load though, so anything outside of park, and it doesn't happen. Haven't tried it in neutral.

Hayne's is kind of vague. Didn't have my Honda book with me at the time either.

Any ideas? Previous idle issues in non-Honda cars sent me back to Idle Air Control...again, no book handy (at the moment), but I don't remember reading about an IAC.

Any ideas?
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Old 09-18-2012, 10:24 AM
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Sounds like IAC to me or vacuum leak. Unplug it and see if the surging stops. The last v6 I worked on would hold at about 3k rpm when I unplugged the IACV.
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Old 09-18-2012, 11:41 AM
jdmorg jdmorg is offline
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Thank you. The vacuum leak scares me...I have no idea where to begin. At least the IAC should be simple to locate with the aid of my books.

To the manuals.
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Old 09-18-2012, 11:42 AM
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IACV. Sounds like what mine did. If you want to try and fix it for awhile, locate it and tap it with a hammer. Maybe it'll stop for a bit but it needs to be replaced.
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Old 10-22-2012, 07:54 PM
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Souds like the IAC vale. Make sure to gt an OEM from a Honda parts store. Aftermarket ones are junk.
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Old 10-23-2012, 08:36 AM
jenga70 jenga70 is offline
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I had a similar issue with my 98. Idle at cold and in drive was fine but when warmed up and in park would go back and forth. Tapped on the top of the throttle body with socket wrench and it would would idle down.

I took the throttle body off and took apart my IAC valve portion and it had some carbon deposits on the inside where the valve rotates. Cleaned everything up and it works fine now.

Here is link to an acura forum for some details.

http://cl.acurazine.com/forums/showthread.php?t=458330
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Last edited by jenga70; 10-23-2012 at 08:40 AM. Reason: added link
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Old 10-25-2012, 02:21 PM
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IACV. I had the same issue a while ago. I cleaned out my IACV after a while of this happening to me and it fixed the problem. I followed pretty much everything that was provided in the link.
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Old 10-25-2012, 04:11 PM
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When my 96 Accord did that it was caused by a leaking inlet manifold gasket..
...
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Old 10-26-2012, 05:36 AM
jdmorg jdmorg is offline
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Thanks all. Going to try and get at it tomorrow.

Does it make a difference if it's a consistant surging? It's not random, it's almost melodic.

Regardless, it' going to be raced again so it can't hurt to get in there and have a look around before next spring.
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Old 10-26-2012, 07:12 AM
jenga70 jenga70 is offline
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Mine was melodic...about every two seconds or so...rpm climb up then drop off and then start climbing again.

I recall reading somewhere the computer was seeing the rpms climb versus the throttle position and was cutting the fuel to the engine until the rpm reached a certain setting and turning the fuel injection back on.
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Old 10-26-2012, 07:13 AM
jdmorg jdmorg is offline
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Quote:
Originally Posted by jenga70 View Post
Mine was melodic...about every two seconds or so...rpm climb up then drop off and then start climbing again.

I recall reading somewhere the computer was seeing the rpms climb versus the throttle position and was cutting the fuel to the engine until the rpm reached a certain setting and turning the fuel injection back on.
Perfect. Thank you jenga....makes perfect sense. Trying for this weekend, I'll let you know how it goes.
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Old 08-19-2013, 02:10 PM
jdmorg jdmorg is offline
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I was just looking around and saw this...

I finally did this late July...I replaced the whole unit. It wasn't terribly difficult and I found the instructions on this forum or one very similar and it worked like a charm. Fixed the idle instantly and the car seemed to run better all around. It was actually a little bit faster this year than last.

I always hate seeing a dead thread without an answer.
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Old 08-20-2013, 08:28 AM
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Glad to know it's all working! Don't you wish you had done it earlier now?
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Old 08-22-2013, 04:21 PM
jdmorg jdmorg is offline
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Quote:
Originally Posted by CDsDontBurn View Post
Glad to know it's all working! Don't you wish you had done it earlier now?
Haha...it'd have been nicer to have more time to work on other things, but the reality is, she sits forgotten in the woods when she's not racing. "Winterization" is almost more work than race-prep.
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Old 12-26-2013, 11:21 AM
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That Did the Trick!

Quote:
Originally Posted by jenga70 View Post
I had a similar issue with my 98. Idle at cold and in drive was fine but when warmed up and in park would go back and forth. Tapped on the top of the throttle body with socket wrench and it would would idle down.

I took the throttle body off and took apart my IAC valve portion and it had some carbon deposits on the inside where the valve rotates. Cleaned everything up and it works fine now.

Here is link to an acura forum for some details.

http://cl.acurazine.com/forums/showthread.php?t=458330
After fixing a MAP issue(PO108 code) I noticed my car would idle fast just after putting in in park when arriving at my destination. When I ordered the new MAP and oring I purchased the TB and IACV gaskets at the same time.....that was a smart move! So, I ended up also using a rotary cutter to get past the Honda 5pt screws. That made cleaning the IACV a lot easier and I was able to lube the bearing on the magnet side. What a difference! The little valve moves with out any effort now. Car running perfectly!
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