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

Rough Idle after injector change

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Old Jul 6, 2024 | 12:40 PM
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Default Rough Idle after injector change

94 Civic Sedan D16a9 DOHC nonvtec

Car was burning through fuel. After some time, figured it was an injector. It was stuck open, so I decided to change all four. Now the car is idling rough. All four are working and seated as best as they can be. I've pulled each one while at idle and each one causes a significant change when pulled. Can't find any vacuum leaks.

I figured air in the system would have larger symptoms. Best I can describe it is that its lumpy. Could something have gotten in the fuel lines when they were changed?

Any help is appreciated.
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Old Jul 6, 2024 | 05:11 PM
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Default Re: Rough Idle after injector change

Unplug the 7.5amp back up fuse in the under hood fuse box, count to 10 and replug it back in. This will clear the ECU of any idle learning it had from the bad injector. Then start and let idle for a bit. This is the idle relearn procedure and may need to be done after the injector swap.
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Old Jul 6, 2024 | 05:32 PM
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Default Re: Rough Idle after injector change

This is great info. Thank you!
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Old Jul 6, 2024 | 09:20 PM
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Default Re: Rough Idle after injector change

... and make sure that you plug the injector clips back on the injectors in the proper order. Starting at the cam gear end of the fuel rail, the signal (ground) wire colors for injectors 1 thru 4 are Brown, Red, Blue, and Yellow.
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Old Jul 8, 2024 | 01:53 AM
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Default Re: Rough Idle after injector change

Yea sounds like you have the injectors harness on wrong.
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