Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Help with rough idle/ CEL

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Old Jan 12, 2017 | 01:55 PM
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Hoessaygodinez's Avatar
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Default Help with rough idle/ CEL

Hi guys so I'm pretty new to mechanical DIY, but I decided to try and take my TB off to clean it since my gas pedal was sticky sometimes. Anyways i took everything apart and to my best memory put it back together. Upon a cold start I noticed my rpms stuck around 1000 (normally they go up to about 1700 and slowly go down as he car warms up). The idle was also a little rough kind of like a pulse/surge. And it smelled a little like fuel as well as giving me a check engine light. My instinct was to take everything back apart and to see if I had forgotten a step or connected something improperly. One thing that came to mind now is that I never disconnected the battery and now I'm curious if the ecu needs to be reset or if I'm dealing with some sort of vacuum leak. Any help from you guys would be much appreciated.
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Old Jan 12, 2017 | 03:45 PM
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Default Re: Help with rough idle/ CEL

What car and want is the cel code?
did u mixed up the tps and map sensor plug?
Throttle cable too tight?
​​
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Old Jan 12, 2017 | 04:03 PM
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Default Re: Help with rough idle/ CEL

Originally Posted by civic402lx
What car and want is the cel code?
did u mixed up the tps and map sensor plug?
Throttle cable too tight?
​​

its a 99 civic ex, I don't think I did I've been looking for a diagram that says where the cables go but I took a picture before hand so I would make sure I put them in the right places.
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Old Jan 12, 2017 | 04:50 PM
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Default Re: Help with rough idle/ CEL

Pull the cel code. What code is it?
did u remove the tb gasket?
The tb cable tension, is it tight? If so, loosen it a bit.
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Old Jan 13, 2017 | 05:53 AM
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Default Re: Help with rough idle/ CEL

Sounds like you switched one of the sensors. I did that before and was getting a terrible bog and gas smell.
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Old Jan 13, 2017 | 07:29 AM
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Default Re: Help with rough idle/ CEL

The sticky "sensors and wiring" at the top of this forum has the information you need. To summarize the 3-pin connectors on the throttle body:
MAP: One of the wires is solid white.
TPS: Has a red-black wire
Three-wire EACV (automatic EX): Has a solid yellow wire
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Old Jan 24, 2017 | 08:43 PM
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Default Re: Help with rough idle/ CEL

Originally Posted by 09chaplak
Sounds like you switched one of the sensors. I did that before and was getting a terrible bog and gas smell.

I connected everything back exactly the way it was. On start up it surges at about 1000rpm and smells like gas. Is there anyway the map sensor could have gone bad or should I just leave the car on? I'm not sure if the ecu needs to relearn everything. When I took the throttlebody off I unplugged everything but not the battery.
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Old Feb 1, 2017 | 12:50 PM
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Default Re: Help with rough idle/ CEL

Originally Posted by civic402lx
Pull the cel code. What code is it?
did u remove the tb gasket?
The tb cable tension, is it tight? If so, loosen it a bit.
its code p0122
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Old Feb 1, 2017 | 01:44 PM
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Default Re: Help with rough idle/ CEL

P0122 Throttle Position Sensor/Switch A Circuit Low Input

Double check all your plugs using the proffered advice from other members, and ensure the throttle plate isn't physically jammed open. Then get back to us please.
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