How important is the purge valve?
04-22-11, 11:04 PM
#1
How important is the purge valve?
I recently got my FB and the PO did a rats nest removal. However, he did not connect up the purge valve and just ran a vac hose from the oil tube to the carb. How bad will this affect the performance of the vehicle? The vehicle is performing very poorly at the moment: will not idle at below 1200-1500rpm, hard to start, and surges at anywhere below 2000rpm. Could the missing valve be contributing to these symptoms?
04-23-11, 09:30 AM
#2
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I recently got my FB and the PO did a rats nest removal. However, he did not connect up the purge valve and just ran a vac hose from the oil tube to the carb. How bad will this affect the performance of the vehicle? The vehicle is performing very poorly at the moment: will not idle at below 1200-1500rpm, hard to start, and surges at anywhere below 2000rpm. Could the missing valve be contributing to these symptoms?
RXDad
04-23-11, 10:36 AM
#3
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That valve,IF I am correct is a ONE way valve.
So really you got a Vacuum leak from the Carb to the Oil.It is sucking air into the carb where it should't be.
Doing what /\/\ says should cure it.
Put a one way valve or a PCV back on it,and it should straighten out the idle situation.
So really you got a Vacuum leak from the Carb to the Oil.It is sucking air into the carb where it should't be.
Doing what /\/\ says should cure it.
Put a one way valve or a PCV back on it,and it should straighten out the idle situation.
04-23-11, 11:18 AM
#4
talking head
PCV is NOT a one way valve,, it has a shape inside that makes it flow LESS at high vacuum ( idle ) and more at WOT
if you use a simple one way valve the motor will draw excessive idle air bypass down this vac line
if you use a simple one way valve the motor will draw excessive idle air bypass down this vac line
simple
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04-24-11, 07:59 PM
#8
Ok, I put the vacuum test on it today. It surging between 13-15 in Hg @ 1000-1100 rpm , is this normal/ good amount of vacuum? I couldn't get the tester on the fuel line, I need a line 'T'. I'm pretty sure 15 in Hg is sufficient vacuum so I'm thinking it might be fuel pressure.
04-24-11, 09:25 PM
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The surging under 2k rpm might also be due to the nature of the rats nest removal. Theres a shutter valve for the rear rotor on the primary port that shuts when you let off the gas to smooth out decel.
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