Q: Ran car on wrong octane fuel
Hi, i am running a ford focus st with around 290-300bhp, it has been ran on shell v power, i stupidly filled up with normal unleaded, i ran the car lightly and drained the tank and is now back running on shell, however even though it has improved it is still misfiring at high revs ( pre detonating i think ) my question is does the ecu take a while to re learn the higher octane fuel?
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
Vehicle won't start after fuel injector replacement
If the vehicle was running before you changed the fuel injectors, the issue may be with the installation. It is possible that the injectors were not installed properly, the harness connection was not reattached correctly, the injectors not seated in...
I need some answers in order to get my permit. please help
Hello. Let's get these questions answered for you. All vehicles should be serviced per the manufacturers maintenance schedule (https://www.yourmechanic.com/article/how-to-maintain-your-car-on-a-schedule-by-brent-minderler). The owners manual contains this schedule that is set up to best maintain the service of any vehicle. There is no...
Car not starting up sometimes - 1998 Toyota Land Cruiser
You have a faulty, possibly intermittent, fuel system and/or ignition system problem(s). Due to the age of the vehicle, you could indeed have a combination of problems. For example, fuel injectors (https://www.yourmechanic.com/services/fuel-injector-replacement) will often get plugged given enough time and...
how to tell if timing chain is bad
Hello and thank you for contacting YourMechanic. Misfires can be caused by sloppy timing chain, spark plugs and wires not working, injectors not working, or a problem within the engine. To check the timing chain, get a timing light and...
My car make a winning sound when I accelerate the engine
Hi there: A whining sound that occurs while you're engine is accelerating is commonly caused by a worn out or loose drive or serpentine belt that needs to be replaced. In some cases, the belt will become loose because the...
how much would a average tune up b for my Mercedes c280 2000
Hi there. Unfortunately, there is no such thing as a "tune-up" anymore. However, there is scheduled maintenance that has a list provided in the owner's manual or on repair sites such as ALLDATA, MITCHELL, etc..... There should be a list...
car making womp womp noise and pop
A common cause of a noise like that is tire belt (internal) separation, flat spot(s) on tire or other tire defects. If the tires end up being excluded during a diagnostic, the CV axles, wheel bearings, and unfortunately the transmission...
Service park assist is displaying on dash
Hello, and thank you for writing in. Your vehicle is equipped with the Park Assist feature which will help you park in difficult situations. When the computer system detects there is an issue, the warning light illuminates to let you...
Car won't start. Tries to turn over and the dies immediately
Hi There, A few different things will usually cause the car to start and then die (https://www.yourmechanic.com/services/car-starts-and-then-dies-inspection). A bad ignition coil (https://www.yourmechanic.com/services/ignition-coil-replacement) can cause this if it is beginning to fail, resulting in intermittent starting problems. A dirty or faulty...
Related articles
Top 10 PZEV Cars for Eco-Friendly Drivers
Teddy Leung / Shutterstock.com The whole idea of a PZEV (that is, a partial zero-emissions vehicle), seems paradoxical. You’d think it’d have to either be zero-emissions or not in the category at all. But as contradictory as...
2012 Ford Escape vs. 2012 Honda CR-V: Which One Should I Buy?
SUVs represent one out of every three vehicles sold in 2012, making them one of the most-purchased types of vehicles in the country during that time period. Compact SUVs are a sub-class that are slightly smaller and offer the most...
The Top 5 Selling Cars in Arizona in 2012
Depending Depending on where you live in Arizona, the weather is either arid or there may be periods of heavy snow – such as in the mountain areas. The vehicles that have been popular in previous years for the area,...
Browse other content
Cities
Services
Estimates