Car engine backfire

There are many things that can affect fuel consumption from incorrect tyre pressures or bad wheel alignment to problems with the engine.

Checking for and rectifying problems to achieve the best fuel consumption can be a rather protracted process and should always begin with an accurate fuel consumption figure. Poor fuel consumption is a common complaint but is often associated with people becoming used to a car they haven't owned for very long - driving it harder and loading it with "junk".

Winter too can adversely affect fuel consumption, especially when used for short commutes.
Another factor could be the way fuel is bought - often by a fixed amount of cash. When there is a price rise then less fuel is obtained for the money but is often perceived as an increased consumption.

check all your engine gas lines after you start the engine. sometimes underneath your rear seat you will find a replacement gas pump access on the deck. the gas pump access packing may be leaking. after you drive your car fresh air filters enters the car and pushes the gas odor out from your car.

check the lambda sensor in the exhaust system
ecu fuel mix sync

Have the misfire diagnosed and the backfiring will be fixed also. The backfiring is caused by the "over-rich" fuel mixture in the exhaust stream and is igniting within the exhaust. Fix the misfire (which will cause the rich condition) and the backfire will be gone.

Hi Dwight, It would help to know more about your problem. What vehicle are you referring to? When does the backfire occur, during acceleration, deceleration, at a cruise speed, at idle? It would also help to know what vehicle, what engine and what fuel type? Regards John

a fuel pump will not increase fuel consumption unless there is a leak,which you say there is none.a change in driving habits can increase it without knowing the habits have changed.some times poor gas quality can cause this or when a fuel company changes its additives when switching from a winter type mixture to a summer mixture.if the thermostat hasn`t been changed for a long time this can cause an increase if fuel consumption,as the coolant sensor will send a signal to the computer that the engine is not up to operating temperature and it needs to increase injector on time(spray more fuel).a tired coolant sensor(rarely),the throttle position sensor(tps)can cause this(on rare occasions)possibly a partially plugged fuel filter as you have to push on the gas farther to get enough fuel to accelerate the car.

HI. In a way, yes. The increase is slight and not very much. it all depends on how you drive your vehicle under this type of condition.

Basically; the nature of a modern exhaust assembly is very restrictive, due to the emissions standards of today's laws. When a exhaust leak occurs, this will cause a slight relief of the restricted nature of the system, thus, allowing the engine to "slightly" breath a bit more. This state will increase the HP rate, slightly, thus, causing a small increase in fuel consumption. It will also cause the sound of the exhaust system to increase, slightly, as well.

The increase of HP and fuel consumption is very small, and it will not be noticed. You may only notice the difference in the sound of the engine, but that is about it.

Yes, but the cost of the supercharger will not pay for itself for most likely however long you own the vicle. In a year you may save 100 dollars and a supercharger is a couple thousand dollars.

check the emission part of your truck for the backfire on deceleration

hi if your backfiring your timing is a little out also increase you idle speed on your carb by ajusting your throttle screw hope this helps if you find this useful please rate it thanks