I just recently bought a 96 integra from the original owner and it had a cel when I bought it. Pulled the code and found out its code 92. Now I noticed 1 nipple was capped on the charcoal canister and a nipple on the throttle body was broken which I believe was the nipple that the charcoal canister was supposed to be connected to. I found some hard vacuum line and it fit into the throttle body and then I ran a line from be capped off nipple to the throttle body. I cleared the check engine light but I noticed you can't feel any vacuum coming from the line. Is that supposed to be a vacuum line or is it for something else?

 

is it before the throttle plate or after?

 

Before

 

Here's a picture for reference. It's in post #6 https://honda-tech.com/forums/acura-integra-6/96-integra-ls-charcoal-canister-question-2882422/ You can see a vacuum line connected to the throttle body to the left of map sensor. I'm wondering if that line there should be under vacuum or not.

 

if it's upstream of the throttle plate, then no, therewon't be any vacuum. it's what's called ported vacuum. it uses the vacuum downstream of the throttle plate only when the throttle is opened

 

So I removed the tb to see where that nipple would lead to and I couldn't see anything. I tried blowing air through it and it did nothing. What's the point to that nipple if it goes no where?

 

Not to mention I'm getting horrible gas mileage. I filled up today and I averaged 22 mpg driving 70% highway and 30% city

 

it goes to ported vacuum. basically, it's a vent for the canister. since engine vacuum draws the vapor into the manifold, the canister must be vented. if it were sealed, the canister would become locked with vacuum. that's why you don't want that capped.
that line, ultimately, goes to the air cleaner. it just allows fresh air into the canister. if that vent were under vacuum, it would be pulling vapors in all the time, which would result in very poor mileage.

what is code 92? the list i found only goes to 91. and were you always getting bad mileage with this car?

 

Code 92 is the evap solenoid/valve/vacuum lines. I've only had the car for a week now but the 1st time I filled up I got around 24 mpg. I'm assuming the cel is effecting my gas mileage since that's the only code I have and I'm not driving crazy or anything like that. I reset the ecu after taking the tb apart and cleaning it so hopefully it won't come back.

 

ok. so it was capped before the code came up? cuz that would make sense. if it were capped, the purge valve wouldn't be able to purge vapor, since the canister would become vacuum locked. i'm assuming that's where the code came from.
the evap will definitely have some effects on your mileage. drive it with the system operating correctly and see if the mileage goes up

 

Yea, that line was capped on the charcoal canister. Ive driven about 50 miles since I fixed it and the cel has yet to come on.

 

if the problem were still occrring, the light would have come on. the evap system runs through self test quite frequently during the drive cycle. well, the purge part does. mainly while cruising. while evap leak test is done during cold start, before you even leave the driveway.
andi believe an evap purge fault would be a one trip failure. meaning a single fault would trip the light..IIRC.
since obd2's inception was mainly focussed on emissions, basically anything to do with emissions is pretty much a one tripper. type a misfiires, catalyst issues, evap, etc..

 

lemme know if the mileage gets better though. if not, there may be sthg else going on

 

Cel just came back on now. In really at a loss for why else to check for.

 

have you tried powering the solenoid directly?
disconnect the vac line from the canister. the one that goes to the purge valve. with the engine running, feed 12v to the solenoid and feel for vacuum at that hose.

 

Is the purge valve located on the intake manifold? If so, I have removed that line with the car running and there is vacuum there

 

you want to test the solenoid here. of course if you pull any hose off the intake there will be vacuum. you want to remove the line at the canister and power the solenoid to see if it's allowing vacuum

 

Alright, I'll do that. So I'll have to power the solenoid with the car running? The solenoid is on the intake manifold correct?

 

Also, there's 3 lines on the charcoal canister. I have a line going from the larger nipple to the evap solenoid, and then from the smaller nipple I ran a line to the throttle body. Is that correct? I just installed the lines the way they were when I bought the car. I just don't know if it'll cause a cel with incorrect lines.

 

yea that should be right. and yes, with the car running. otherwise you have no vacuum disconnect the line going to the evap purge solenoid. disconnect it at the canister. power the solenoid with 12v. feel the end of the line for vacuum with the solenoid powered. there should be vacuum

 

Is there a certain wire I should connect the 12 volts to?

 

alright ya turkey. now you've got me actually doing work here . looked in my half *** haynes manual and it appears the evap solenoid is ground switched through the ecm. disconnect the solenoid and supply 12v to the yel/blk pin and ground to the red one

 

Hahahaha, thanks. I couldn't really look at my car right now so I figured you would be able to tell me.

 

no worries. my pleasure

 

Alright, I connected the 12v to the purge solenoid while the car was running and there wa vacuum with the solenoid connected, with nothing connected and with 12 volts going to the solenoid.