Chevy/GMC Flex Fuel: Running Rich
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Date: 2020-08-05
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Comments and reviews: 10
Terry
I wonder if some of the Ford flex fuel vehicles can have similar problems? Twice now in the last few years I have had rich codes on my 2004 4. 0 ford sport trac and had slight rough idle. After doing the usual MAF cleaning and other things and not solving my problem I watched Eric O's earlier vids about resetting the computer and that has fixed my problem both times.
I have been guilty of regularly topping off my tank a few bucks at a time and also would sometimes run some E85 for the heck of it.
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I wonder if some of the Ford flex fuel vehicles can have similar problems? Twice now in the last few years I have had rich codes on my 2004 4. 0 ford sport trac and had slight rough idle. After doing the usual MAF cleaning and other things and not solving my problem I watched Eric O's earlier vids about resetting the computer and that has fixed my problem both times.
I have been guilty of regularly topping off my tank a few bucks at a time and also would sometimes run some E85 for the heck of it.
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twistedsledder
ERIC PO451 tank pressure sensor after market fuel pump GMC Sierra 1500 flex fuel that code keeps coming up after install 29 percent alcohol level have seen the evap solenoid code also PO446 which is not coming up now just the PO451 is this a bad tank pressure sensor on a crappy aftermarket fuel pump this is the second one installed under warranty if 5 volt reference is there what could it be causing this code other than a tank pressure sensor that is not working well on this fine GM product
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ERIC PO451 tank pressure sensor after market fuel pump GMC Sierra 1500 flex fuel that code keeps coming up after install 29 percent alcohol level have seen the evap solenoid code also PO446 which is not coming up now just the PO451 is this a bad tank pressure sensor on a crappy aftermarket fuel pump this is the second one installed under warranty if 5 volt reference is there what could it be causing this code other than a tank pressure sensor that is not working well on this fine GM product
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ArcadeAir
I had the 172 and 175 codes intermittently on my 2014 Silverado 5. 3 GDI and the first thing I looked at was the fuel composition. It was at 6%. fuel trims were off the charts, both banks ltfts = -35 and stfts = -30. MAF sensor not over reporting either. I isolated the PCV with no fuel trim improvments, then isolated the evap with the same results. The problem disappeared a few weeks later and has not recurred. I am open to suggestions as to what would cause this
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I had the 172 and 175 codes intermittently on my 2014 Silverado 5. 3 GDI and the first thing I looked at was the fuel composition. It was at 6%. fuel trims were off the charts, both banks ltfts = -35 and stfts = -30. MAF sensor not over reporting either. I isolated the PCV with no fuel trim improvments, then isolated the evap with the same results. The problem disappeared a few weeks later and has not recurred. I am open to suggestions as to what would cause this
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Robert
Funny the other garages didn't pick up on that one earlier? Or maybe they did? Hard to trust any one under the hoods now days. Eric O, maybe he's the one mechanic that everyone within 50 miles should be considering. Thanks Eric for telling it like it is.
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Funny the other garages didn't pick up on that one earlier? Or maybe they did? Hard to trust any one under the hoods now days. Eric O, maybe he's the one mechanic that everyone within 50 miles should be considering. Thanks Eric for telling it like it is.
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David
Why did this need the reset? What made it change to an incorrect setting? If the customer cannot easily reset this him/herself, then this is a truly awful system. Will it reoccur if the root cause is not addressed? This one left us hanging Eric.
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Why did this need the reset? What made it change to an incorrect setting? If the customer cannot easily reset this him/herself, then this is a truly awful system. Will it reoccur if the root cause is not addressed? This one left us hanging Eric.
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Mohsin
My LTFT STFT are - 17. MAF 2. 6 on idle and with ac on idle 3. 5. egr error 99. 2 sometimes egr fluctuating even negative error. O2 sensor 1 no reading sensor 2 reading is. 1 to. 9. air fuel ratio commanded and measured fluctuating.
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My LTFT STFT are - 17. MAF 2. 6 on idle and with ac on idle 3. 5. egr error 99. 2 sometimes egr fluctuating even negative error. O2 sensor 1 no reading sensor 2 reading is. 1 to. 9. air fuel ratio commanded and measured fluctuating.
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Jet
Good to know, I have a Flex-Fuel 05 Avalanche with approx. 130, 000 miles. Never had a problem with the Flex-Fuel system or the eng not running properly. I try to run E85 as much as possible in her she drinks a lot of alcohol: -)
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Good to know, I have a Flex-Fuel 05 Avalanche with approx. 130, 000 miles. Never had a problem with the Flex-Fuel system or the eng not running properly. I try to run E85 as much as possible in her she drinks a lot of alcohol: -)
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Chevboy167
Had same problem on my 09 Silverado. Alcohol content was in the 30s when I run 91 pure gas since new. Had my mechanic disable comp data sensor. I will never run any ethenol in it. No more problems and get more mpg!
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Had same problem on my 09 Silverado. Alcohol content was in the 30s when I run 91 pure gas since new. Had my mechanic disable comp data sensor. I will never run any ethenol in it. No more problems and get more mpg!
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James
Water in the gas from a bad refuel station can trigger that. Usually I just add octane booster to a full tank and it goes back to normal. Does not always work so I say just reset it like he recommends
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Water in the gas from a bad refuel station can trigger that. Usually I just add octane booster to a full tank and it goes back to normal. Does not always work so I say just reset it like he recommends
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Grimm's
I have shown your old video with the same prob to customers and let you explain what the prob is and not to top off the fuel tank as often as they do. Thanks for all the info and entertainment
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I have shown your old video with the same prob to customers and let you explain what the prob is and not to top off the fuel tank as often as they do. Thanks for all the info and entertainment
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