Backfiring

[H-vegasdisco]

My truck started backfiring throught the air intake on sat. and I thought it could be a maf problem so I installed a another maf that works yesterday and it still is backfiring. I am leaning toward the tps but does anybody have any insight? Oh and I erased the codes after putting the new maf on so I don't have those either. Also it won't really rev over 1750 rpms either.

[Elemental]

Gasoline Otto Engine No start/Misfire Diag Principles.

Backfiring is almsot always I timing issue. Shotgunning sensors will not cure that.

However, the Crank Sensor does come loose, and will affect timing.

[TerryS]

The airflow sensor would not likely be the cause of backfiring back through the intake, but it can quickly be ruined by it.
Intake backfiring can be a result of timing, or crossfiring through bad wires, but more frequently it results from a worn cam, or other valvetrain wear, such as a sloppy chain or worn chainwheels. Exhaust backfiring is caused by timing, crossfiring, carbon buildup or excessive fueling. How many miles on your truck

[Elemental]

The tests I outlined will point out why you are backfiring...

But, testing involves actually doing something. Its easier for this board to be spoonfeed the answer.

[H-vegasdisco]

the engine has around 108k miles on it

[Elemental]

Start testing. I gave you enough information to start diagnosis.

[H-vegasdisco]

It was the dang crankshaft position sensor.