Honda Civic Performance - JDM Discussion Engine tech, forced induction, springs, shocks, brakes, tires, etc.

throttle problem

Old 01-Aug-2007, 03:27 AM
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throttle problem

recently did a zc swap. now everytime i start the car is revs like crazy without touching the gas. i checked the throttle cable because i thought it was too tight but it still does it everytime i start. does anyone know what this is from?
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Old 01-Aug-2007, 12:03 PM
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revs up and down constantly????
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Old 01-Aug-2007, 02:11 PM
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yeah its strange, after i start itll chug like the idle is too low then redline like crazy so i gotta shut it up. i checked the throttle cable because i was told it was too tight but it didnt help.
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Old 01-Aug-2007, 06:13 PM
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do you have any of the connectors (iac, map, or tps) swaped around
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Old 01-Aug-2007, 07:27 PM
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no everything is connected to the proper plugs. would something in the throttle body mess up to make this happen, such as a bad TPS?
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Old 01-Aug-2007, 10:09 PM
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You sure on the connectors?

tps&map = same connector
iat&iacv = same connector

what rpms are we talking here?
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Old 01-Aug-2007, 11:21 PM
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we're talking 7-8 K.
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Old 02-Aug-2007, 06:48 AM
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sounds l ike tps problems.
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Old 02-Aug-2007, 03:25 PM
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i thought it was that but wouldnt it do it all the time if that was messed?
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Old 07-Aug-2007, 12:16 AM
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i dunno, I thought the car can't just rev up on it's own with the throttle plate being closed due to lack of air. so it's either the IACV letting in too much air, or the engine has a major manifold leak.
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Old 08-Aug-2007, 09:48 PM
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thanks bbarbulo ill check into the IACV i know i had an extra hose after the dohc zc swap on my charcoal canister would that have anything to do with it?
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