Skip the auto shop - Our mechanics make house calls

Q: Low MPG

asked by on

IM HAVING TROUBLE WITH THE FUEL INNECTION CLEANING. ITS A GDI SO DOES IT REQUIRE A CERTAIN ADDITIVE LIKE SEAFOAM? Also my car makes a cluttering noise trying to go up hills its sounds like the oil is old but just recently got a oil change.

My car has 58000 miles.
My car has an automatic transmission.

A: Generally speaking, injectors are very reli...

Generally speaking, injectors are very reliable components. For some years now injectors have been designed to be self cleaning and don't need any maintenance. Cleaners that are sold that are added to the gas tank, like Sea Foam, can actually harm fuel injectors over time if the mix ratio is wrong and you use it regularly. If you have a bad injector the best thing to have a fuel injector replacement service.

Cluttering or dieseling is usually a sign of pre-detonation. In your vehicle, the timing is controlled by the computer. So unless you had the timing belt replaced recently, and the timing is off a bit, the dieseling is probably caused by carbon in the cylinders. Normally, fuel is ignited by the spake plug at a specific time. The carbon is like a piece of charcoal and ignites the fuel prematurely. When this happens, the engine basically is fighting itself. I suggest seeking help from a qualified mechanic such as one from YourMechanic, to help you identify the source of the cluttering sound.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How do I adjust the headrests?

All of your seats have headrests, which provide comfort and protection for your head and neck. You can raise the height of a headrest by pulling it straight up to the desired position. To lower the headrest, press the Release...

Q: My cars tempature fluctuates

Hi! What I would do as a technician includes the following. A thorough visual inspection underhood of everything that could affect cooling system performance. Next I would verify that the temperature gauge in the instrument cluster is reliable and accurate....

Q: When the car is running it doesn't want to shift gears. But when it's off it will shift gears 2004 Hyundai Accent

Hi - check your clutch hydraulic fluid level. The clutch reservoir may be one and the same as for the brake system - they both use brake fluid. I believe that most likely your clutch slave cylinder has failed and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...