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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Gasoline | 46Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| This is only the case if your ECU cannot advance ignition timing to compensate for 93 octane (almost all modern cars can compensate for different octane ratings with special sensors that detect what octane fuel is in the tank, and almost all cars can adjust ignition timing). 87 octane has a faster flame propagation compared to 93 octane, so it can be ignited really close to top dead center and give you full power. Running 93 octane requires an earlier spark plug ignition to account for the slower flame propagation. So if your ECU cannot advance the timing, i ... | |||||
| Answer to: Mechanics haven’t been able to diagnose !!! | 43Relevance | 6 years ago | jack62 | Submit Your Question HERE | |
| "Running a bit rich" is an understatement. The computer triggered the P0172 code because (using AFR sensor (O2B1S1) voltage values)), it can't overcome the rich condition by adjusting (negative) fuel trim and it's at its limit to maintain the 14.7 parts air to 1 part fuel ratio. (when the code is triggered) When that code is getting triggered your Negative Long Term Fuel Trim must be pegged. (you'd think that would raise any mechanic's eyebrow). You're running very rich and with your turbo setup the first place to look is for a boost Leak. Think about it. When a Vacuum leak occurs, unmetered air (after the MAF/MAP sensor(s)) is getting into the intake manifold. (The computer doesn't know it's there so it can't add the appropriate fuel, and a "Lean Condition results). With a boost Leak, the air has been "metered". The computer expects it to enter the intake manifold and adds the appropriate amount of fuel for that "metered" air to maintain the aforementioned 14.7 parts air to 1 part fuel ratio. But if you have a boost Leak. The "metered" air never gets into the intake manifold. (it's leaking out before that) The computer is adding fuel for air that never makes it to the combustion chambers. Meanwhile, the AFR (O2B1S1) sensor is telling the computer (which "thinks" it's adding the correct amount of fuel based on the MAF/MAP sensor metered air) that the mixture is too rich. The computer "believes its sensors at the air intake and exhaust. It has no way of knowing about any boost Leak so it drops the P0172 code in your lap and "says", you figure it out. Since you mentioned mechanics I'll assume you aren't a "Do It Yourselfer". Most shops (that do a boost Leak Test) will either use smoke, or more likely low air pressure to find any boost Leaks. You may want to call around your area and ask a few shops if they can perform a boost Leak Test on your Subaru wrx sti | |||||
| Answer to: 2011 Chevy Cruze 1.4T turbo under boost code no acceleration, poor mpg | 40Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| If you really want to check it out yourself, here are a few places to look assuming the turbo is not blown: First make sure all the hose clamps on the induction piping are all tight. Turbocharged engines operate under pressure, so you don't want any of that sweet boost to leak out from loose piping. I'm talking about the piping from the turbo compressor all the way to the throttle body, including the intercooler (if equipped). Vacuum lines are VERY IMPORTANT on turbocharged engines. Vacuum lines are used for proper operation of the wastegate and turbo bypass valve. Make sure all the vacuum lines going to these components are in-tact and not loose/corroded. If all the pipes are nice and tight and the vacuum lines are good, check the turbo bypass valve on the turbo itself. Most of the time, this is the culprit for under-boost codes. This valve releases excess boost from the pipes when the throttle plate closes. So if the valve is stuck open or even worn out (they get worn out fast, especially the ones with a rubber diaphragm) it will prevent the turbo from creating pressure in the induction piping. The wastegate regulates the amount of exhaust gases used to spin the turbine, thus regulates how much boost the turbo produces. Best way to check the wastegate is by visual inspection while someone revs the engine. The wastegate arm should move back and forth as the engine revs, signifying that it is properly working. The last thing to check are the MAP sensor(s) themselves. Dirty MAP sensors can give inaccurate readings to the ECU on how much boost the turbo is actually making. Perhaps try cleaning them. Good luck to you, hopefully it's not a bad turbo as these other components are fairly easy to replace. LIVE DATA is very important to diagnose turbo issues...I'm looking forward to seeing the uploaded data. | |||||
| 2008 Infiniti m35x 89 octane without ethanol or 91 octane with ethanol? | 31Relevance | 5 years ago | gsxr4dre | Submit Your Question HERE | |
| 2008 infinity m35x is it better to run 89 octane athanol free or 91 octane with 10 % or more athanol.? Thanks | |||||
| Midgrade with Octane boost vs Premium | 31Relevance | 5 years ago | Tyrell | Submit Your Question HERE | |
| Hey Sir Scotty, can Mid Grade Gas with octane boosters be an equivalent Premium Gas? I have my eye on an 2007 Acura TL Type S that require Premium gas but if I could use mid grade with octane booster instead with no issues then great. Thanks in advance | |||||
| Answer to: Octane boost vs premium gas | 31Relevance | 6 years ago | BruceREE | Submit Your Question HERE | |
| If your car be recommended to take 93, then go 93. From what I understand, almost all fuel cleaners and octane boosters are more akin to snake oil except a very limited few. Most of the commercial ones that you can buy off the shelf fall under this category. Since you bought a car with required 93 you are barred from going lower if you want to preserve the car decently. Modern computers can auto correct and all that, but not for long and especially with a turbocharged engine you would want to use the highest octane pump gas available. Short answer:No it is ... | |||||
| Distance to empty on Ford Escape 2014 | 40Relevance | 4 years ago | Benjilafouine | Submit Your Question HERE | |
| Hello, I have a tricky question. On my Ford Escape 2014 2.0L AWD turbo, I always fill the tank with octane 91 gasoline and I am always getting a 535 km distance to empty (could be 525, I’ll document next time). With gas prices going through the roof in the beginning of summer, I decided to fill the tank with octane 87 just to try and the distance to empty went down to 469 km (I still had a little bit of octane 91 gas in the tank). This new value puzzled me, considering that I never thought that my car “knew” the octane level in my tank. In fact, I became s ... | |||||
| Answer to: Do all turbos require premium fuel | 40Relevance | 5 years ago | Justin Shepherd | Submit Your Question HERE | |
| ... this. My 1979 Pontiac Catalina has a 301 V8 is carburated with an 8.5:1 compression ratio and it's naturally aspirated, so putting premium in my car would be an absolute waste of money. The engine can't adjust for the higher octane, and it doesn't have high compression or forced induction to raise the pressure enough to cause spontaneous fuel ignition. In a modern turbocharged engine like the EcoBoost Mustang's engine the compression rationis 9.5:1 and they have forced induction. Sensors in the engine monitor the compression stroke constantly for pre-ig ... | |||||
| Answer to: Do all turbos require premium fuel | 40Relevance | 5 years ago | Dad2LM2 | Submit Your Question HERE | |
| ... the fuel (this is how a diesel engine works without spark plugs). Turbos and superchargers pre-compress the air before it enters the cylinder in order to increase the oxygen available for combustion. The problem with using low-octane fuel in older turbo cars is that at the higher pressure, you can get spontaneous ignition before the cylinder reaches the high point of the compression stroke (ie, pre-ignition), which causes knocking and can eventually damage the engine. You can overcome this by using higher octane fuel, which is less prone to pre-ignition. ... | |||||
| Answer to: Octane boost vs premium gas | 31Relevance | 6 years ago | toyotagrl | Submit Your Question HERE | |
| Don't waste your $$ on octane boost from Wally world or any of the box stores, that stuff is crap. | |||||
| Sheetz 88 octane | 29Relevance | 3 years ago | TheBlackTop | Submit Your Question HERE | |
| Hey Scotty, I’m just watch your new video on gas station and what came to my mind is Sheetz 88 octane. Sheetz is the only gas station that has E85 and 88 octane. They said on google that 88 octane is use in vehicles after 2001 and my CivicR is a 2002. You think it’s ok I use it on my car and is it cheaper than regular? | |||||
| Answer to: Use octane booster instead of premium fuel? | 29Relevance | 4 years ago | Chuck Tobias | Submit Your Question HERE | |
| I do have a car that the manufacturer suggests using premium fuel and I use mid-grade in it with no octane booster. It makes no noticeable difference unless you lean really heavily into the loud pedal in which case you can feel the engine control system pulling back a little. Modern engine management systems are very good at adapting to different fuel grades but each model car can react differently. If your car really needs the higher octane to run properly you're better off just using the correct fuel with lab-certified octane rating instead of fooling aro ... | |||||
| When I use 87 octane my engine knocks. When I use 91 or 93 it doesn't. | 29Relevance | 5 years ago | SchwarzeneggerPlease | Submit Your Question HERE | |
| Scotty, I have a 2015 Kia Optima. 104k miles. 2.4 liter. GDI. Automatic. When I use 87 octane my engine knocks. If I use 89 octane it doesn't knock as much. If I use 91 or 93 octane the engine doesn't knock at all. Could it be a dirty fuel filter, or do I need to get the injectors pressure cleaned? Could it be something else? I also get a high pitched whine when accelerating hard above 4000 RPM. Thanks. | |||||
| RE: Octane Booster Question | 29Relevance | 5 years ago | DontKnowler | Submit Your Question HERE | |
| "Do you have any literature" Not really. Read it many times in many sources, but all those sources were in Russian, sorry. However the English Wiki also says: "Because of the 8 to 12 octane number difference between RON and MON noted above, the AKI (Anti-Knock Index) shown in Canada and the United States is 4 to 6 octane numbers lower than elsewhere in the world for the same fuel." (RON and MON being different octane index measuring methods used in different countries) | |||||
| Answer to: Ethanol free gas? | 40Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| Keep in mind that gas without ethanol has less octane compared to ethanol-blended gas. The whole point of blending ethanol in gas is to raise the octane and to have cleaner burning gas. Pure ethanol has an octane rating of 113, whereas pure gasoline is 85. You'll notice that pure higher-octane gas is more expensive because they use non-ethanol additives to increase the octane (anything race fuel oriented is expensive). Honestly, if anyone feels any difference between ethanol and non-ethanol gas, then it's all in your head. There's no way you'll be able to fe ... | |||||