Rough Idle after maintenance - Honda Civic Forum

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Rough Idle after maintenance

Old 02-15-2010
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Rough Idle after maintenance

In cold temperatures (below 20 degrees), my 1999 Civic EX has a very low and rough idle. After about ten minutes, it is still rough unless I turn the car off and turn it back on. Then the engine is fine. I changed the plugs, distributor cap, rotor, fuel filter, and cleaned IACV, but still I have the problem. Any ideas?
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Old 02-15-2010
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Re: Rough Idle after maintenance

Originally Posted by hrbassji View Post
In cold temperatures (below 20 degrees), my 1999 Civic EX has a very low and rough idle. After about ten minutes, it is still rough unless I turn the car off and turn it back on. Then the engine is fine. I changed the plugs, distributor cap, rotor, fuel filter, and cleaned IACV, but still I have the problem. Any ideas?
have you tried an ecu reset? warm car up first to operating temp. pull ecu fuse or disconnect battery. reconnect and let car idle with all electricals off for 10 min.
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Old 02-19-2010
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Re: Rough Idle after maintenance

The engine still has trouble starting, and once it does, it is a lumpy idle until it warms up and I restart the engine. Then it runs normal. I have a CEL which I need to get checked.
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Old 02-19-2010
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Re: Rough Idle after maintenance

Duh. Fix your CEL light first.
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Old 02-19-2010
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Re: Rough Idle after maintenance

You should change your wires. Changing plugs without wires could cause that problem. Also pulling a code from your CEL wouldnt be a bad idea either, but definately change the wires.
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Old 02-23-2010
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Re: Rough Idle after maintenance

went to autozone and they pulled this code:
P1607
ECM/PCM Internal Circuit Failure A

help?
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Old 02-23-2010
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Re: Rough Idle after maintenance

ouch. sounds like you need a new computer. but its ok. those ecus are like uncontrollable weeds. you can find them anywhere for maybe 50bucks used

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Old 02-24-2010
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Re: Rough Idle after maintenance

Yea but he will need to reflash it to match his key and airbags.
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