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  #1  
Old 08-01-2011, 08:10 AM
rking4500 rking4500 is offline
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Default 2003 Flex Fuel 3.0 Rough Idle

I have a 2003 Edge with the 3.0 Flex Fuel Engine. About 1.5 months ago i put E85 into the tank and my check engine light came on. I read that the E85 can trip up the O2 sensor, so i didnt think anything of it. Last week when i was going to work, i started her up and had a rough idle, sounded like back fire as well. The kids at autozone ran the computer test and showed that it was an o2 sensor. Left bank ? They cleared it out so that the check engine light wouldnt be on. I have put about 100 miles on it and no check engine light came on... I had the plugs and wires changed about 20,000 mi ago. Fuel filter some time ago and just changed the air filter, that was quite dirty. On the highway you can feel it jerking, and it feels like it wants to stall at stop lights.

PLEASE ADVISE
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Old 08-01-2011, 08:47 AM
sgtsandman sgtsandman is offline
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Default Re: 2003 Flex Fuel 3.0 Rough Idle

Try running some Seafoam (1/3 can) or Chevron Techron through the fuel system. Your fuel injectors might need some cleaning.
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Old 08-01-2011, 09:09 AM
rking4500 rking4500 is offline
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Default Re: 2003 Flex Fuel 3.0 Rough Idle

I put Lucas injector cleaner in 2 days ago. How long does it take to work ?
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Old 08-01-2011, 11:15 AM
sgtsandman sgtsandman is offline
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Default Re: 2003 Flex Fuel 3.0 Rough Idle

An entire tank some times two.

I've heard bad stories about going right to E85 from regular gas. I'm not sure why it is a problem but apparently it is. Maybe it breaks varnish and deposits loose in the fuel lines??? I don't know.

In any case, I guess you are supposed to slowly work up to full E85. Like 1/4 tank the first time, 1/2 the next, then 3/4 with the remainder being regular gas of course.
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1999 Honda CR-V EX, RT4WD, 2.0L, 5 Speed MT, 4.56:1, open differential
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Old 08-01-2011, 01:37 PM
ChromeYellowEDGE ChromeYellowEDGE is offline
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Default Re: 2003 Flex Fuel 3.0 Rough Idle

thank you :-)
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Old 08-01-2011, 01:41 PM
rking4500 rking4500 is offline
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Default Re: 2003 Flex Fuel 3.0 Rough Idle

do you think that there is a possibility that the 02 sensor could be bad ?
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Old 08-11-2013, 03:34 AM
mm03rangerxlt mm03rangerxlt is offline
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Default Re: 2003 Flex Fuel 3.0 Rough Idle

The first time I put E85 in my truck, the CEL came on. It was the 02 sensor. I replaced it and have been running E85 ever since with no CEL. That was 2.5 years ago.

My truck runs quieter on E85. Perhaps it's the way I drive, I have not noticed much difference in MPG. I get about 295 miles off a tank of E85 and about 306 on gas.
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