Rich smell from exhaust and decreased MPG
#1
Rich smell from exhaust and decreased MPG
So, I have a 2010 Honda Civic EX-L with 84,000 miles on it. I have noticed a "rich" smell from the exhaust a few different times while idling and on the road. It's not consistent and sometimes it doesn't have a smell at all but the biggest difference I've noticed is my MPG has gone from around 26-29 down to an average of about 24. It doesn't smell "sweet" like coolant. I've noticed an intermittent decrease in power as well but it is very subtle.
The check engine light is off. The problem has been going on for a few months. For maintenance and a possible fix to my problem, I replaced the plugs and added Seafoam to the fuel. This was done a couple of months ago. I'm just not sure what the problem is and hoping someone here can help. I've been thinking it might be the cat. converter but there's no check engine light and when I pulled up the live data, the converter was pushing around 1000 degrees Fahrenheit which from what I read is normal.
Any replies would be greatly appreciated!
The check engine light is off. The problem has been going on for a few months. For maintenance and a possible fix to my problem, I replaced the plugs and added Seafoam to the fuel. This was done a couple of months ago. I'm just not sure what the problem is and hoping someone here can help. I've been thinking it might be the cat. converter but there's no check engine light and when I pulled up the live data, the converter was pushing around 1000 degrees Fahrenheit which from what I read is normal.
Any replies would be greatly appreciated!
#2
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Re: Rich smell from exhaust and decreased MPG
Pull the spark plugs and look at the state of them...
Here is a good reference:
NGK Spark Plugs USA
How does the car perform apart from that like acceleration?
Here is a good reference:
NGK Spark Plugs USA
How does the car perform apart from that like acceleration?
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Re: Rich smell from exhaust and decreased MPG
tested your plug wires lately?
if any are over 25k ohms = replace
that was my rich smell issue.
why cant anyone make 100k mile wires???:hmmm:
if any are over 25k ohms = replace
that was my rich smell issue.
why cant anyone make 100k mile wires???:hmmm:
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Re: Rich smell from exhaust and decreased MPG
check the o2 sensor also. typically when they go bad it dumps more fuel instead of making the car run lean ( kinda like a limp mode) sometimes it does not show up on a scan or a check engine light but that's a typical gremlin for a Honda
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maharashii
Honda CRX / EF Civic (1988 - 1991)
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11-17-2002 09:00 PM