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Rifle sitting a long time but brand new won'thold air pressure
Oiled cylinder with 3 in one oil and now I hear air leaking in the action area it shoots very weakly and no power at all. The rifle is approx. 15 yrs old and brand new Model 766 Crosman
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If it is an older air rifle, they used a felt washer in the pressure tube to make it seal when it was cocked. That felt might be old and therefore it disintegrated when oiled and used. That would mean there is no air pressure to force the bb out.
Here are a few things to check, you may have already checked some of these.
*Electricity...Compressors will run best with full 115Vot 15AMP/Or 220V electrical supply from a circuit, over the shortest electrical cord as possible.
*Air Leaks..Place your ear close to the compressor and listen for air leaking, if you hear air that is not normal and means you have to locate and repair whatever it is that is leaking.
*Check the air unloader valve... The air unloader valve will blown out air when you turned off the compressor, that is normal. But it should not have air leaking out of it all of the time. If so then it is faulty and in need of repair/replacement.
*Valves...If either the intake or exaust valves fail, breaks, or fails to seat, then your compressor will run 24 hours a day and never build up to the correct pressure for shut-off.
*Gaskets...Check to see if your gaskets have failed. You could have a gasket failure between the pistons and you will never know it because it shows no external air leak. If this situation happens then the air will only cycle between cylinders and never build up the correct air pressure. One way to check the gasket is remove the air filter, then put your hand over the intake.
If correct then it will **** you hand against the intake. If the valve or valves have failed then you will feel the air sucking in and blowing out.
*Piston Rings and Cylinder...The piston rings could be stuck,broken, or worn and not allowing the correct pressure to build up in your tank. A worn cylinder will also contribute to the problem of pressure build-up.
*Pressure Switch...Check for air leaks at the pressure switch, it has a rubber diaphram that can fail and leak air out of the system.
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Put #3 cylinder in firing position then put air pressure in that cylinder and remove the oil cap. If air comes out throttle body the intake valve is leaking. If air comes out the tail pipe the exhaust valve is leaking. If air comes out where the oil cap came off the piston is leaking.
the po300 code is for a cylinder misfire, usually followed by a last number of 1 2 3 ect, showing which cylinder is misfiring, normally this can be fixed by installing a new set of plugs, the po171 code could be this
The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor. you cleaned that but it could be fouling out you could also have this happening
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure
The o-ring or gasket is worn and can't take more pressure after the 5th or 6th pump, you should be able to get a gasket kit for it from your retailer. Hope that helps!
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