Air pressure issues 97 Pete

How about changing the air dryer filter. Mine was popping off every 20 seconds or so until I changed the filter.

 

On that 97, you likely still have stratoflex #4 air lines to the governor. I would expect a leak in the sense line from air tank to govenor. Those stratoflex lines get porus over the years.

Spray those lines with soapy water and i spect you'll find the issue.

The only reason it's purging is beacuse the governor is telling it to. No sensors or gauges affect it.

 

I'd get a mechanical air pressure gauge and stick it on the wet tank. See what's going on there.

Typically the governor will get its signal from the wet tank. Air in primary and secondary reservoirs is protected by one-way check valves, so any loss of pressure in the wet tank will not be seen on the dash gauges.

 

Yes my first thought to is that the signal has a leak. But..hmm...the signal line tells the compressor when to start building pressure again. So yeah if that line leaks it tells the compressor to build pressure again and then since you haven't really lost actual pressure the dryer will purge again and is starts all over. Change the signal line... had to talk myself through that, sorry

 

BTW, if your mechanic can't fix a simple issue like this, may need to look for another.

 

Not a mechanic. That’s probably a technician, looking for where the computer that tells him what’s wrong with it plugs in.

 

Update?