I have a 1990 Honda Civic EF using the D16A6 engine type.

I have deleted the "Charcoal Canister" and the "Purge Cut-Off Solenoid Valve".


What is the correct way to route vacuum back to the "MAP Sensor". What ports need to be capped or vented to atmosphere to operate correctly? Thank you .

- Nick

 

vacuum hose no. 21 from the front of the throttle body to the MAP sensor needs to stay - don't do anything
vacuum hose no. 12 from intake manifold to purge solenoid - delete - cap nipple on back of the manifold where hose was removed
vacuum hose no. 7 from purge solenoid to canister - delete along with solenoid and canister
hose from canister where it says "to two-way valve" runs from canister to steel vent line coming out of firewall - delete the hose, but leave the steel vent line uncapped

 

So you just let the fuel tank over-pressure-fumes just come out of the vent-line into the engine bay? Pew!

 

And just in time for summer!
Ahhhh - that fresh gas fume smell on those days where it's warm and you park in a lot with the windows up!

 

why anyone would want to eliminate the purge system is way beyond me, but the fumes have to go somewhere

 

There is literally ZERO performance benefit. Perhaps it's for that "clean" engine bay look. Too bad it won't have that "clean" engine bay smell.

 

The main reason is delete unnecessary components to free up space within the engine compartment. The space on the firewall where the charcoal canister is in place is needed for the catch can set-up to be mounted that I'm going to be using which also conveniently provides a straight route to the rear of the engine for the AN line to be placed. This car is also a dedicated track vehicle.

- Nick

 

Gotcha. Just be aware that line poking out of the firewall will be venting fuel vapor into your engine bay. I'm not sure how race cars account for this. It also flows the other direction in that it breaths fresh air into the tank as the fuel level drops.

 

Hmm never really thought about this, I've never heard of anyone ever having issues with this though (shrugs)

 

At least cap it with a filter or something so you don't get debris inside the line.

 

I'll be taking your advice on this