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Constant revving up and down at idle

Engine Tech / Drivetrain


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Old 02-14-2011, 01:00 AM   #1
BeastMode0N
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Default Constant revving up and down at idle

Hey, I gotta manual 1995 Honda Civic Hatchback. It has a d15z1 block with a d16z6 head. I just bought the car and when idling, the car revs from about 1200 to 2000 over and over pretty quick. It never corrects itself. When feathering the clutch, it idles fine. It drives quick as hell too. There arent any vacuum leaks. I don't think it's the idle contol either. Any ideas?
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Old 02-14-2011, 01:26 AM   #2
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O2 Sensor maybe?
CEL on?
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Old 02-14-2011, 01:29 AM   #3
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its the peice that is in back of ur intake maifold clean it or buy a new on it happend on my 94 hatch
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Old 02-14-2011, 01:35 AM   #4
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Quote:
Originally Posted by slammedhatch View Post
its the peice that is in back of ur intake maifold clean it or buy a new on it happend on my 94 hatch
^2x
Clean your IACV.
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Old 02-14-2011, 02:32 PM   #5
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Old 02-14-2011, 02:38 PM   #6
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Clean and adjust the FITV attached to the bottom of the throttle body.
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-Manuals: site 1 and site 2; -Spark; -Fuses; -Pull 92-00 CEL codes; -Fuse 15 TSB; -Clean IACV or FITV
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Old 02-14-2011, 06:28 PM   #7
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There is a chance it could be low coolant as well. Definitely clean your IACV and make sure all the air is bled out of your coolant system.
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Quote:
Originally Posted by Blahman240 View Post
just yell vtec out the window when you're getting on it, its kind of like egging it on, then eventually it just gets louder.
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Originally Posted by anonmassive View Post
i heard the louder the vtec, the faster the car.
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Old 02-14-2011, 11:46 PM   #8
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Alright, thanks guys. Ill try to clean out the IAC
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Old 02-15-2011, 12:58 AM   #9
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i just did this today to my friend's car. it drove fine but idle was fluctuating. so first thing i did exactly in order was cleaned the intake idle air control valve out, then sealed around his sensor on the intake and pulled unpluged the battery for like a min and then we started it up and vroom no more funny idle problem fixed!!! check gasket's like around tb and vaccum line's ect.. with car running either with your hand and listen for idle changes or a piece of paper just go around everthing!
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Old 02-21-2011, 08:36 PM   #10
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where is the iacv located on a 95 d15b7 mine is doing the same thing
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Old 02-21-2011, 08:45 PM   #11
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For you^ and the OP:

Quote:
Originally Posted by RonJ View Post
Clean and adjust the FITV attached to the bottom of the throttle body.
For 92-95 Civics, this is a more common cause for a fluctuating idle. Click the FITV link in my signature.
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Old 02-21-2011, 08:54 PM   #12
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Quote:
Originally Posted by 93civicloco View Post
where is the iacv located on a 95 d15b7 mine is doing the same thing
should be on back of the intake manifold two bolt's hold it in, it has two hoses connected to it, and one plug!
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Old 02-22-2011, 08:57 PM   #13
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ok thanks
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