I recently replaced my fuel tank and fuel filler tube, and while in there replaced all of the fuel hoses and decided to take a shot at restoring the EVAP system, including:
- new check valve (mine was missing, just had a line from the fuel vapor container to an open-ended hard line that led to the engine compartment.
- installed a used oem charcoal cannister (appears to be a CA version, model year correct). also missing when I purchased my FJ40. The cannister tested correctly as per the emissions manual using 40 lbs of air pressure.
-installed a model year correct VSV and connected it to the original harness plug on the driver side fender. The VSV appears to pass on ohms, voltage, and air flow testing as per the 1977 emissions manual.
- replaced my original emission controller with a restored replacement unit, same part #. Not sure if the inside was restored.
- ohm tested the speed sensor signal to the controller, which appears to be functioning.
- voltage tested the controller harness which showed just under 12 volts on pin #4 when ignition was turned on.
Now the challenge. While the vehicle is in motion, I'm not reading any vacuum when reaching the speed thresholds that should activate the VSV. I put the original controller back in, but same result. With the controller harness unplugged from the controller, the engine cranks and stops correctly with no apparent difference. The vacuum routing is exactly as listed in that great diagram from Subzali several years ago. Currently there is no TP unit, so that outlet is capped on the VSV. Are there any solutions out there I'm overlooking? I'd like to have the EVAP system fully functional, but wondering if it is possible.
- new check valve (mine was missing, just had a line from the fuel vapor container to an open-ended hard line that led to the engine compartment.
- installed a used oem charcoal cannister (appears to be a CA version, model year correct). also missing when I purchased my FJ40. The cannister tested correctly as per the emissions manual using 40 lbs of air pressure.
-installed a model year correct VSV and connected it to the original harness plug on the driver side fender. The VSV appears to pass on ohms, voltage, and air flow testing as per the 1977 emissions manual.
- replaced my original emission controller with a restored replacement unit, same part #. Not sure if the inside was restored.
- ohm tested the speed sensor signal to the controller, which appears to be functioning.
- voltage tested the controller harness which showed just under 12 volts on pin #4 when ignition was turned on.
Now the challenge. While the vehicle is in motion, I'm not reading any vacuum when reaching the speed thresholds that should activate the VSV. I put the original controller back in, but same result. With the controller harness unplugged from the controller, the engine cranks and stops correctly with no apparent difference. The vacuum routing is exactly as listed in that great diagram from Subzali several years ago. Currently there is no TP unit, so that outlet is capped on the VSV. Are there any solutions out there I'm overlooking? I'd like to have the EVAP system fully functional, but wondering if it is possible.