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What does it mean when an engine is running rich?

Engine Tech / Drivetrain


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Old 12-26-2006, 12:04 PM   #1
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Default What does it mean when an engine is running rich?

Also, is running rich necessarily a good or bad thing? If it's good, what can I do to my engine to get it to "run rich"?

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Old 12-26-2006, 12:37 PM   #2
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Old 12-26-2006, 12:47 PM   #3
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running rich is when your air/fuel ratio is too rich in fuel.
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Old 12-26-2006, 12:49 PM   #4
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it means too much fuel is getting passed through and not all of it is igniting
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Old 12-26-2006, 01:00 PM   #5
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too much fuel isnt good, especcially when all of it isnt being burnt.
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Old 12-26-2006, 01:02 PM   #6
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on the other hand... its better to run rich than lean (especially at altitude)
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Old 12-26-2006, 01:13 PM   #7
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Originally Posted by PhntmSk8r
on the other hand... its better to run rich than lean (especially at altitude)
true that, leanness kills
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Old 12-26-2006, 02:55 PM   #8
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Quote:
Originally Posted by dnunit
Also, is running rich necessarily a good or bad thing? If it's good, what can I do to my engine to get it to "run rich"?

Thanks.
Runing rich is acutally bad. Now, ofcourse if you are boosted, you want to run more fuel, but that is to compinsate for the boost.

You want to run perfect, not lean, not rich. Running either will cause some performance loss, and running rich can cause pre-ingition problems as well as really s***ty gas milage. Id rather run lean then rich, cause your engine will last longer lean then rich. It will also cause your sensor to go bad faster (02 and what not).

Id get your 02 sensors checked out.
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Old 12-26-2006, 03:12 PM   #9
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running too rich is bad, running a little rich is perfectly safe. every car in production comes from the factory a little richer than it needs to be. they all also have a catalytic converter that burns the fuel that your engine didnt ignite.

running lean is ABSOLUTELY NOT safer than running rich. its the reason why a basemap gets tuned to lean out the air fuel mixture, and why a basemap doesnt start lean and then you richen it as you tune.

running lean causes detonation... running rich does not
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Old 04-30-2012, 09:54 AM   #10
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i have this same problem.... im a newbie to this can yall tell me what i should do to run perfect like what parts to switch or adjust or wat not..... would really like the advice
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Old 04-30-2012, 10:09 AM   #11
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Quote:
Originally Posted by Shiznit View Post
running too rich is bad, running a little rich is perfectly safe. every car in production comes from the factory a little richer than it needs to be. they all also have a catalytic converter that burns the fuel that your engine didnt ignite.

running lean is ABSOLUTELY NOT safer than running rich. its the reason why a basemap gets tuned to lean out the air fuel mixture, and why a basemap doesnt start lean and then you richen it as you tune.

running lean causes detonation... running rich does not
^^This. Never ever is running lean a good thing. I would rather have an o2 go bad than have pinging and detonation.
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Old 05-01-2012, 01:37 PM   #12
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This thread is from 2006, but as long as it stays on topic, works for me

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Originally Posted by tex-civic View Post
i have this same problem.... im a newbie to this can yall tell me what i should do to run perfect like what parts to switch or adjust or wat not..... would really like the advice
So by problem you mean that you're running rich? How do you know? Running rich isn't entirely bad, it's much better than running lean and risking detonation.. especially in boosted vehicles. Rich will just foul out your spark plugs quicker than normal wear.

Issue possible be an issue with an o2 sensor though. Do you have a Check Engine Light (CEL) lit up?
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Old 05-01-2012, 05:52 PM   #13
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Quote:
Originally Posted by XpL0d3r View Post
This thread is from 2006, but as long as it stays on topic, works for me
doh!

But like he said check codes.
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