Chevrolet Silverado - P0172 P0175 Running Rich
video description
Date: 2020-08-05
Related videos
Comments and reviews: 9
vdub
I don't normally comment on here, but I just want to say thanks. This video helped me tremendously. I have been an auto tech for 20+ years, and even GM certified. I left Chevy the dealership in '07 and have since opened my own shop. I was unaware that they were using fuel trims at fill up to determine fuel composition. I was only familiar with the systems that used inline fuel composition sensors. Last week I had an '06 Sierra comes in my shop with these issues, and found the fuel trims at -19%. The truck wasn't badged flex fuel, I checked for a fuel composition sensors in the fuel line, which wasn't there so I determined it wasn't flex fuel. To make matters worse when I was entering the vehicle info into my scanner I was choosing the first 5. 3L option on the list which was non-flex fuel, so my scanner was not showing a fuel comp parameter in current data, or giving me fuel comp reset option in special functions. Only after finding this video did I double check and found the engine code was Z(flex fuel. After entering the correct engine VIN code into my scanner I could then perform a fuel comp reset, and a fuel trim reset and problems gone. Again, I want to thank you for doing this because even us professionals need help sometimes.
reply
I don't normally comment on here, but I just want to say thanks. This video helped me tremendously. I have been an auto tech for 20+ years, and even GM certified. I left Chevy the dealership in '07 and have since opened my own shop. I was unaware that they were using fuel trims at fill up to determine fuel composition. I was only familiar with the systems that used inline fuel composition sensors. Last week I had an '06 Sierra comes in my shop with these issues, and found the fuel trims at -19%. The truck wasn't badged flex fuel, I checked for a fuel composition sensors in the fuel line, which wasn't there so I determined it wasn't flex fuel. To make matters worse when I was entering the vehicle info into my scanner I was choosing the first 5. 3L option on the list which was non-flex fuel, so my scanner was not showing a fuel comp parameter in current data, or giving me fuel comp reset option in special functions. Only after finding this video did I double check and found the engine code was Z(flex fuel. After entering the correct engine VIN code into my scanner I could then perform a fuel comp reset, and a fuel trim reset and problems gone. Again, I want to thank you for doing this because even us professionals need help sometimes.
reply
Aaron
Nice video. I have a 08 impala 3. 5 flex fuel with p0172 code only. Lights been on for a week now. Do you think fuel trim, composition needs reset? Car has no drivability issues and the cars mpg is normal and hasn't decreased any. We get like 23mpg on average. I cleaned the maf sensor and plugs and wires were done at 100k. Car has 111k on it now. Wife does put in 10 here 10 there. I fill it up every friday. I know it says it could be many things bank 1 o2 sensor, fuel regulator, dirty injectors, vacuum leak ect ect. I'm trying to pin point down the exact cause but my scanner is a cheapy scanner it doesnt have fuel trim or composition option. Any help is appreciated. Thanks!
reply
Nice video. I have a 08 impala 3. 5 flex fuel with p0172 code only. Lights been on for a week now. Do you think fuel trim, composition needs reset? Car has no drivability issues and the cars mpg is normal and hasn't decreased any. We get like 23mpg on average. I cleaned the maf sensor and plugs and wires were done at 100k. Car has 111k on it now. Wife does put in 10 here 10 there. I fill it up every friday. I know it says it could be many things bank 1 o2 sensor, fuel regulator, dirty injectors, vacuum leak ect ect. I'm trying to pin point down the exact cause but my scanner is a cheapy scanner it doesnt have fuel trim or composition option. Any help is appreciated. Thanks!
reply
Justin
This video is what sent me over to the dark side. Bought a autel maxidas ds808. I've always been able to fix my vehicles with wrenches and cleaners until my 2011 Silverado. Couldn't fix it running like pooh and starting like a Ford when cold. Reset the alcohol content (it was at 87%! strange as I've only used 100% no ethanol fuel) and followed you videos instructions and is now purring like a kitten and It starts like it's summer time now.
Also did my folks impala that was doing the same thing and had the running rich code as well. Tool is well on its way paying for itself already and will continue to as vehicles are only getting smarter.
reply
This video is what sent me over to the dark side. Bought a autel maxidas ds808. I've always been able to fix my vehicles with wrenches and cleaners until my 2011 Silverado. Couldn't fix it running like pooh and starting like a Ford when cold. Reset the alcohol content (it was at 87%! strange as I've only used 100% no ethanol fuel) and followed you videos instructions and is now purring like a kitten and It starts like it's summer time now.
Also did my folks impala that was doing the same thing and had the running rich code as well. Tool is well on its way paying for itself already and will continue to as vehicles are only getting smarter.
reply
Scott
I have a 2013 Chevy Silverado that is having the same issue. Flooded the spark plugs to where it wouldn't start so I had to have it towed. He said my alcohol was reading at 60%, I only use 89 octane in my truck. Ran fine for 3 weeks and is doing the same thing again. Will not start, so i contacted a different mechanic and he said it will start if I push the gas pedal all the way to the floor before I turn the ignition. Is this correct? Secondly, what do I do about getting this problem resolved, can't be down every three weeks. Is it a bad sensor? thanks
reply
I have a 2013 Chevy Silverado that is having the same issue. Flooded the spark plugs to where it wouldn't start so I had to have it towed. He said my alcohol was reading at 60%, I only use 89 octane in my truck. Ran fine for 3 weeks and is doing the same thing again. Will not start, so i contacted a different mechanic and he said it will start if I push the gas pedal all the way to the floor before I turn the ignition. Is this correct? Secondly, what do I do about getting this problem resolved, can't be down every three weeks. Is it a bad sensor? thanks
reply
Cristi
Hello,
Hoping for a little help here. Here is the situation, I have a 2015 Chevy Suburban running rich. I replaced the mass air flow sensor but it didn't do anyting the long-term fuel trims are at -35 at idle. And it's popping the rich fuel mixture codes but nothing else. I did a fuel injector cleaning and it solved nothing. Also cleaned the throttle body. Fuel pressure looks okay at the tank and also at the rail. I don't know what else I should look at.
reply
Hello,
Hoping for a little help here. Here is the situation, I have a 2015 Chevy Suburban running rich. I replaced the mass air flow sensor but it didn't do anyting the long-term fuel trims are at -35 at idle. And it's popping the rich fuel mixture codes but nothing else. I did a fuel injector cleaning and it solved nothing. Also cleaned the throttle body. Fuel pressure looks okay at the tank and also at the rail. I don't know what else I should look at.
reply
oakraider80
My 2014 Silverado is saying that the fuel is running too rich in bank 1 and 2. My Check Engine light comes on every couple of weeks or so. I was wondering if I should change out my O2 sensors or use Seafoam to clean out the fuel injectors. If I take my truck to the dealership they'll charge me 140 just for the diagnostics. Pretty sure I can get all 4 O2 sensors replaced for that price. If you have any tips please help.
reply
My 2014 Silverado is saying that the fuel is running too rich in bank 1 and 2. My Check Engine light comes on every couple of weeks or so. I was wondering if I should change out my O2 sensors or use Seafoam to clean out the fuel injectors. If I take my truck to the dealership they'll charge me 140 just for the diagnostics. Pretty sure I can get all 4 O2 sensors replaced for that price. If you have any tips please help.
reply
Dave
I may be confused. but if the system was wrong originally and applying a negative fuel trim to what was not really a rich situation, wouldn't this engine have been in-fact running lean? Is the rich code that set the MIL active a factor determined by the long term trim? Or if it was the O2 sensors, I would have thought they would be showing lean instead.
reply
I may be confused. but if the system was wrong originally and applying a negative fuel trim to what was not really a rich situation, wouldn't this engine have been in-fact running lean? Is the rich code that set the MIL active a factor determined by the long term trim? Or if it was the O2 sensors, I would have thought they would be showing lean instead.
reply
Michelle
I have a 2012 tahoe. I put regular unleaded gas in this morning, drove about 30 miles and my check engine light came on. P0172 & P0175. I watched the video, but don't have access to that kind of software. Will the code reset if I empty the fuel? Is it possible that the gas was bad and that once I burn off what's in the tank, the code will reset?
reply
I have a 2012 tahoe. I put regular unleaded gas in this morning, drove about 30 miles and my check engine light came on. P0172 & P0175. I watched the video, but don't have access to that kind of software. Will the code reset if I empty the fuel? Is it possible that the gas was bad and that once I burn off what's in the tank, the code will reset?
reply
Brian
Great info Eric. Thought your video on EVAP was my life saver, but something else is going on. 2007 Impala throwing P0172(Rich bank 1, but the only monitors not finishing are EVAP. Short term -3. 1%------Long term -21. 1%. EVAP purge 0%. Alcohol fuel 50. 2%. All o2's check out. Do you make house calls? LOL What gives?
reply
Great info Eric. Thought your video on EVAP was my life saver, but something else is going on. 2007 Impala throwing P0172(Rich bank 1, but the only monitors not finishing are EVAP. Short term -3. 1%------Long term -21. 1%. EVAP purge 0%. Alcohol fuel 50. 2%. All o2's check out. Do you make house calls? LOL What gives?
reply
Add a review, comment
Other channel videos
