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Short air bursts while driving

After looking at other relevant posts I cannot seem to figure out what is wrong with the truck. While going down therl road (only while moving) a small burst of air will come every other second. It seems this will only happen while I am driving. The bursts will come slowly and as I speed up the truck, the bursts will speed up too. The air sounds like its coming from the air gov, but since the air will only leak while the truck is moving I can't check it. Any advice?

My truck is a 2005 freightliner Columbia

Area's already Checked: Air gov mount screws

Air lines leading from gov

Pressure release valve

Answer this question I have this problem too

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I just went through this same thing...it turned out being the purge valve on the bottom of the air dryer...these are the steps I went though...air gov...dryer cartridge..that seemed to solve the problem but then later that day the purge valve completely let go..bypassed air dryer and limped it to kenworth and bought an air dryer and swapped it in the parking lot...haven't had a problem since

Hope that helps

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Like I said 6 days ago... The air dryer needs serviced. Lol..

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Sounds like your air dryer needs serviced.

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...explain to me tho how a dryer leaking would simply magically be fixed by servicing the cartridge when the purge valve is not serviceable...

Your answer was correct but not complete

...also didn't look at the date

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Air dryer constant purge or other purging problems are now always a problem with the air dryer.

You can have a small leak in the air dyer signal line, governor gasket, and most of the time leaking unloader valve in the compressor.

This particular year and model of truck (if it has a bendix compressor) has a know issue with leaking unloader valve. We test this by removing the air governor, installing an air fitting to the unloader port with an air gauge, supply shop air to 120 psi. If it leaks more than 2 psi in a minute, it is bad. Generally it will not hold air at all when it has failed.

http://truckmechanictips.com

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