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Old 02-26-2010, 04:24 PM   #1
BgJeff23B
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hfc causing rough idle

ever since i put the hfc and hks exhaust on i have been having rough idle and alot of backfiring popping going on. sometimes when i come to a stop it will have a rough idle. do you need a re tune when you do this?


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Old 02-26-2010, 05:41 PM   #2
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a tune would likely fix your problem. Also check your O2
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Old 02-27-2010, 08:57 AM   #3
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are you throwing any CEL's. if its back firing it sounds like its running really rich so i also agree with the above that you need to check o2's. a tune would also help but i have an exhaust with ORP and dont have any issue with a stock tune so its not required. did you reset the pcm when you installed it. if im not mistaken anytime you do a modification to a focus you need to remove the negative batt terminal for 15 mins to reset the pcm. then when you reconnect it and crank it up the pcm goes throu and learning stage for a few miles. it normally does run the greatest or have the most optimum performance but it relearns the car and mods. i know that for my orp and TB it was suggested in the instructions to reset the pcm. just some ideas.
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Old 02-27-2010, 09:15 AM   #4
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Backfiring doesn't mean you're running rich. With my previous tune, my car would sometimes backfire like a banshee and according to my AFR gauge, I was running leaner than 18:1. A HFC should not cause a rough idle at all. Something else mechanical or electrical is going on.
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Old 02-27-2010, 09:19 AM   #5
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ive replaced plugs and wires. im thinking maybe the pcv valve may be bad. i do have a p0420 code.
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Old 02-27-2010, 10:13 AM   #6
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Most any mods need a tune , Adding a HFC the engine leans out so a tune not only will help the lean issue but you will have a scan tool where you can fine any other issues that show up

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Old 04-03-2010, 11:13 AM   #7
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I'm actually having the same problem. My engine runs really rough at idle and sometimes stalls out. I have no cat on my car. So doing a tune would fix it?
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Old 04-03-2010, 11:56 AM   #8
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Not necessarily. You could have a mechanical/electrical problem.

Has the car *always* run like that after putting the ORP on? If the problem just developed recently, doesn't sound tune related. Dirty MAF, fouled spark plugs, bad front O2 sensor, bad coil pack, etc, can cause problems.
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