If this is not connected to the IM will this throw a CEL? I just threw one 4 days after installing the AEBS IM. The EVAP purge control solenoid is not connected to the IM, as the IM does not have a connection for it. The car seems to still run just fine, so its not in limp mode, but I haven't been able to check the exact code yet. Anyone know?




Modified by DOSPOWND at 5:39 AM 9/8/2003

 

as long as the solenoid is plugged in it should be ok. the hoses do not have to be connected to the manifold or to the black can. or at least that has been my experience. ive been running my hoses disconnected for a while now and have had no cel's, but the solenoid is still plugged in.

 

I believe the pic is by stinky tofu (I saved it to my hd and I dont know the original thread anymore).

If that's the same sensor, looks like you can T into the pcv line.

 

Yes, OBD2 cars will throw a code if the EVAP system is not connected properly. They will also throw a code if the gas cap is loose or missing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">Yes, OBD2 cars will throw a code if the EVAP system is not connected properly. They will also throw a code if the gas cap is loose or missing.</TD></TR></TABLE>

Do you think that Teeing it will make the CEL go away?

 

It should, if that's what code you are pulling.

 

have you figured what CEL code you are throwing?

 

not yet, I just learned how to tell. I need to walk out to the car. I think I can now actually. I hit back in a min or 2.

 

OK, I got it. It is throwing a CODE 92. Evaporative Emission Control System insufficient purge flow.

I tried resetting the ECU, but it popped back on and I didn't even start the car yet. Maybe I reset the ECU wrong. I took out the ECU fuse for about 1 min. Maybe I needed to do it longer. I guess I need to connect that hose and Tee it into the PCV. Am I correct in thinking this, or is there any other possibilities?

 

Sounds like you need to tee that purge line in to the PCV.

 

Odd, I unplugged that and I didn't get a code. ?????

 

I had mine unplugged with the stock ECU for ~300 miles, no code...with the Hondata I always have it unplugged.

Austin

 

what does the evap do exactly? I know it has to do with emissions and unburnt fuel and all that but how does it work exactly? is it always working(constantly on)? I only ask because I'm running a jdm ITR ecu and it doesn't work with the evap. I think they don't have an evap in japan, do they? and I didn't pass emissions at idle cause it wasn't burning all the fuel. I passed the co'2 part but not the hydrocarbons.

 

It burns off raw gas from the fuel system that evaporates. The evaporative emissions are routed through the charcoal cannister (where it is stored when the car is not running) to the intake manifold for burning during cruising.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">It burns off raw gas from the fuel system that evaporates. The evaporative emissions are routed through the charcoal cannister (where it is stored when the car is not running) to the intake manifold for burning during cruising.</TD></TR></TABLE>so it would have no effect on a warm running car?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ivan &raquo;</TD></TR><TR><TD CLASS="quote">so it would have no effect on a warm running car? </TD></TR></TABLE>

The effect would be minimal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOSPOWND &raquo;</TD></TR><TR><TD CLASS="quote">If this is not connected to the IM will this throw a CEL? I just threw one 4 days after installing the AEBS IM. The EVAP purge control solenoid is not connected to the IM, as the IM does not have a connection for it. The car seems to still run just fine, so its not in limp mode, but I haven't been able to check the exact code yet. Anyone know?

Modified by DOSPOWND at 5:39 AM 9/8/2003</TD></TR></TABLE>

Rather than spending your time figuring out about the EVAP issue, why not express your concern to the IM manufacturers, since the product doesn't suit all your needs. (i.e., important parts of your emissions system)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by George Knighton &raquo;</TD></TR><TR><TD CLASS="quote">

Same here. Do you get some weird surge behaviour with it plugged in?</TD></TR></TABLE>

I believe RagingAngel had that problem with a noise from the evap so everyone decided to leave it unplugged.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by George Knighton &raquo;</TD></TR><TR><TD CLASS="quote">

Same here. Do you get some weird surge behaviour with it plugged in?</TD></TR></TABLE>

Nope...that was due to the IAC Duty cycle, we changed it and it went away. I had issues with starting the car when it was hot. If I remember correctly the P28 ECU energizes the EVAP circuit as soon as the ignition is on(even during cranking) so it was making it a little difficult to start the car as the intake charge also had a large amount of gasoline fumes. The OBDII ecu does not energize the circuit until the car reaches a specific speed, which doesn't impact the starting whatsoever. This is the information that I've deduced from my research, and I believe it to be fully correct.

Austin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOSPOWND &raquo;</TD></TR><TR><TD CLASS="quote">I tried resetting the ECU, but it popped back on and I didn't even start the car yet. Maybe I reset the ECU wrong. I took out the ECU fuse for about 1 min. Maybe I needed to do it longer</TD></TR></TABLE>

Yea, you need the backup fuse not the pgmfi/ecu fuse... its in the underhood fusebox marked "backup" or jsut disconnect the battery.

 

I usually remove the ECU fuse and the backup fuse....step on the brake twice to clear the code and then plug it back in and go from there...

some tech told me stomping on the brakes twice clears the code?

Dah...wutever...it's something I do now anyway.... seems to work.

I can't comment on the architecture of the EVAP solenoid...all I know is for anybody using Hondata with their R who experiences the whooshing sound on startup....unplug that bitch up.

For me when I went back to the OEM ECU.... and forgot to plug the solenoid back in....the MIL went on right away when I started the car.

 

i have obd2 (ver 1) on my car and as long as the solenoid is connected its ok even though the hoses are not connected to anything.

 

I had mine disconnected and I threw the code after about 3 months of driving. So I plugged it back in and and plumbed the stock "output" hose to the intake manifold and left the "input" hose disconnected. Seems to work fine for me but you can hear it ticking/cycling sometimes under light load... oooh no! Little bits of unfiltered air

Aaron.

 

Austin,

How do you change the IAC Duty cycle? I'm also having problems starting when the car is hot. Should i disconnect the EVAP connector or the hose?

Thanks

MODS: bolt-ons, cams, hondata s200

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by seanb18c1 &raquo;</TD></TR><TR><TD CLASS="quote">Austin,

How do you change the IAC Duty cycle? I'm also having problems starting when the car is hot. Should i disconnect the EVAP connector or the hose?

Thanks

MODS: bolt-ons, cams, hondata s200</TD></TR></TABLE>

It's in the Hondata programming, we plugged in my tuners Hondata box and went out to datalog the problem, he said that the only thing he could see that it might be would be the IAC duty cycle...so we burned a new chip and the surging disappeared.

Austin