thirsk66

iTrader: (2)

How is this possible I have been wondering why my car runs so sluggish at times and just no where near decent for an h22. I was curious so I disconnected the plug from the evap solenoid took my car for a test drive and it pulls harder and sounds healthier to me. I ended up looking into my charcoal canister and evap solenoid it is from a 92-96 prelude nit from a 97-01 Prelude.

minilogoguy18

See if the valve holds vacuum with the engine off, it should be shut, put a hand held vacuum pump on the line coming from the manifold. Only apply a small amount so you don't damage the valve, it should hold vacuum. If it's stuck open it could explain all of this, if stuck open it wont hold vacuum since with the key off the canister vent is open on the system allowing fuel vapors from the tank to constantly be put into the intake.

If it's a street car EVAP is a good thing to have working, it saves fuel by taking the normally wasted vapors from the evaporated fuel in the tank and burning it as fuel trim. When purge operation starts the primary HO2 sensor see's the increase in fuel being used and reduces injector duty to compensate.

You're charcoal canister doesn't matter if it's from another car, if it works that's enough, it's just a filter for the fuel vapors coming into the engine to keep dirty air out of the intake.

backinblue92

iTrader: (1)

Out of curiousity, would the normally wasted vapors be run to the exhaust and produced essentially as hydrocarbons if the evap wasn't working? And do u know would that affect the car at all speeds or just low speed/certain conditions?

minilogoguy18

If the EVAP system doesn't work properly you'll either vent all vapors to the atmosphere or pressure will build in the system to the point in which you'll force a leak somewhere causing a leak. Nothing routes to the exhaust system. Evaporated fuel also causes much higher emissions than what comes out of the tailpipe besides the fact that you're just wasting fuel by letting it evaporate into the atmosphere.

thirsk66, what car do you have? OBD1 and OBD2 EVAP systems are very different. Parts are not interchangeable, as the EVAP system pretty much runs sort of opposite as far as how the PCM purges the canister.

thirsk66

iTrader: (2)

I mistakenly made the wrong assumption this evap canister I havery is for my 98 prelude and I am just unsure of a sensor that is just hanging there by the charcoal canister. I will take a picture of it and see what yu guys think it is. I have looked at the evap system diagram and this damn sensor doesn't exist on it so I am lost on this completely.

holmesnmanny

Just curious, when you unplug it do all your troubles go away ? I hope this is the root reason for your problems with your swap.

thirsk66

iTrader: (2)

Sorry I am late with these pictures, here they are and for the two vacuum lines on this solenoid one goes to the bottom of the charcoal canister to the solenoid and the other is connected from the solenoid to the nipple on my intake manifold. I have looked at the diagram for the EVAP system on Majestic Honda and no where in there does this solenoid exist. I am so confused on this issue. And where does the hose outlined in RED go, just to any vacuum source?

thirsk66

iTrader: (2)

Just took off that solenoid and ran the existing vacuum line form the bottom of the charcoal canister to the nipple on the intake manifold.

minilogoguy18

You never answered what car you drive so I have no idea what model prelude your driving if it even is a prelude at all since a Torneo Euro R is your avatar.

Why try to use a parts picture to figure out the EVAP line routing? Don't you have the free online service manual?

The parts picture looks like a 5g and the purge control solenoid you're holding in the pictures is from a 4g which wont work because the wiring and solenoid operation is reversed. Go buy a purge valve and hook the system up properly.

thirsk66

iTrader: (2)

Yeah I have a 98 prelude and that solenoid was removed so it no longer poses any issue to my evap system. I have an online service helms manual I will review but I can almost guarantee that there is no extra solenoid like that in the evap diagrams. Edit: Just looked at the hemls manual and that solenoid doesnt exist, I have looked over all my EVAP system and I have all the parts that I need to have nothing is missing, I think the damn previous owner just threw this solenoid in there for no reason.

backinblue92

iTrader: (1)

Previous owners are idiots.

That reminds me of the previous owner of my Prelude, who sold me the car with a blown h23 and an uninstalled jdm h22. But he took the cam gears, crank timing gear and water pump off the car and replaced with their h23 counterparts. So when I went to do the timing belt, I was in for a surprise. Apparently, the h23 belt will work with h23 timing components despite the higher deck height of an h22 as long as you don't use a tensioner at all. NO TENSIONER. AT ALL. I can't believe it ran like that for 5 years just fine. Lol

thirsk66

iTrader: (2)

Just test drove my car with that solenoid gone out of the system my car idles high now instead of around 850rpm what the hell gives? I must be missing something here. UPDATE: Just drove home and the car popped code 14 which is for the IACV. But it is stuttering in low rpm's I thought that the iacv only controlled idle not drive-ability. I will swap this iacv out and put a known good one on.

EDIT: Saw that my iacv wires were disconnected from the butt connectors I had used, redid them and code is now gone. I did some researching and I believe that hose that goes from the bottom of the charcoal canister attached to the cruise control assembly, since I dont have mine in anymore I will leave that hose off for good unless someone else on here tells me otherwise.

backinblue92

iTrader: (1)

So is the idle and stutter all fixed now? I wasn't quite clear on that.

U plugged the hose the goes into the cc right? Or left it off and closed the nipple?

thirsk66

iTrader: (2)

The stutter and code is gone now. I did leave the hose from the canister unplugged and plugged off the nipple on the intake manifold.

backinblue92

iTrader: (1)

Good stuff. So you're all good now?

Also didn't mean to imply u left some kind of hose open ended. Lol. When I was younger I used to be working on the car and my dad was always yelling at me to make sure I torqued the bolts and capped the lines. So I say it automatically haha.