2007 scion tc eats too much gas. scion tc l4-2.4l 2007

Q: 2007 scion tc eats too much gas.

asked by on September 10, 2017

My 2007 scion eats alot of gas. I have to fill up the tank just about once a week and don't drive far just city driving and maybe 10 mi highway driving. Why is it consuming so much gas? Also when I'm at a stop it makes a heavy shaking sound from the right side of engine but only when in gear. It doesn't do this in neutral or park with engine running.

My car has 270000 miles.
My car has an automatic transmission.

There are a number of things that can cause poor fuel mileage. A faulty camshaft position sensor is one of them. The camshaft position sensor is a magnetic sensor that monitors camshaft speed to regulate ignition timing and fuel injection timing. It gathers and sends information about the car’s camshaft speed (and as a result the position of each piston) to the car’s electronic control module. This information is received by the computer, which then uses this data to further calculate the time of ignition and the timing of fuel injection required by the engine. When this is not working properly, you may experience a drop in power, poor idling, poor fuel mileage and problems starting the vehicle.

A clogged or dirty EGR valve may also cause poor fuel mileage. The EGR valve is a small component designed to allow the flow of exhaust gases into the intake manifold in controlled amounts. Whenever you start the engine, the valve comes alive and waits in a closed position, blocking the flow of exhaust gases. Once the engine reaches operating temperature and speed increases, the valve, either through vacuum or electronic control will gradually open, allowing burned exhaust gases to enter and combine with the air-fuel mixture inside the combustion chamber. When the EGR valve is clogged or dirty, as they are prone to, it may not function properly causing the engine to idle rough, stall at idle speeds, cause the car to get poor fuel mileage, or emit a strong smell of fuel due to excess hydrocarbons which also results in failing emissions tests.

A clogged or failing catalytic converter can cause the vehicle to have poor fuel economy. As you may already know, the catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this causes these gases to be backed up into the exhaust system not allowing the engine to breathe properly. When this happens, the engine is forced to work much harder to expel these gases. This often results in the engine bogging down, hesitating, shaking and causing very poor fuel economy. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
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

Get a quote

What others are asking

How do you remove the electrical connector from the power steering pressure sensor on a 2007 AWD Nissan Murano.

You first have to remove the rubber boot back and then the release is on the sides and all you do is squeeze the sides and it should come loose for the sensor.

Does the replacement of a thermostat include replacing the housing? I was told I needed to replace the thermostat housing.

Hi, thanks for writing in. The thermostat housing and the thermostat itself are two different components and do not necessarily need to be replaced together or at the same time. The housing is just a piece that covers the thermostat...

I have a Audi 2007 q7 and my epic light is on and my cars shakes a little while driving and idling a little what could I.t be

You will need to have the computer tested to find out what codes are stored in memory and then have those codes tested to find out why the check engine light and EPC light is on. A mechanic like one...

Related articles

A Buyer’s Guide to the 2013 Scion FR-S
This This sporty little twin of the Subaru BRZ offers the same light, fun to drive platform but in a bit more spartan, budget-minded form. The marriage of affordability and sports car-like driving is a successful one in the 2013...
A Buyer’s Guide to the 2012 Scion xD
The The 2012 Scion xD is designed to answer the needs of a younger crowd – those that want an affordable vehicle that is proven reliable, provides easy navigation in tighter quarters, and offers a unique design that is nothing...
The Best Used Cars to Buy for Short Commutes
If If you’re lucky enough to have a short commute to work, then you need to consider different factors when buying a used car than someone with a lengthier drive (or more time stuck in traffic). Chances are good that...