OBD 2 -> OBD 1 conversion... EVAP control????
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OBD 2 -> OBD 1 conversion... EVAP control????
Okay, it's a 97 d16y8... converted it to OBD 1 yesterday with a P28 chipped+socketed with a Hondata S200B. When I start it cold or cool, the idle slowly goes from 1500-2000 and back as it's warming up. I unplugged the IACV while it was doing that and it idled at 800rpm... big surprise.
What's been bugging me is this loud whining sound I hear as it's warming up that I can only hear from under the car toward the front as it's warming up. That sound will go away as soon as it's been on for a certain amount of time, about 2 minutes... and it will idle normally (with the IACV still plugged in the whole time.)
Now, today when it was whining, I unplugged the EVAP purge control solenoid (on top of the fuel rail... this:
When I unplugged that, the whining stopped and it idled properly, but the CEL was on. I turned the engine off and started it back up again and the CEL was gone, still idling good.
My question is: What do I need that plugged in for with OBD 1? I thought the OBD 1 ECU didn't have EVAP controls... Sorry that was so long.
What's been bugging me is this loud whining sound I hear as it's warming up that I can only hear from under the car toward the front as it's warming up. That sound will go away as soon as it's been on for a certain amount of time, about 2 minutes... and it will idle normally (with the IACV still plugged in the whole time.)
Now, today when it was whining, I unplugged the EVAP purge control solenoid (on top of the fuel rail... this:
When I unplugged that, the whining stopped and it idled properly, but the CEL was on. I turned the engine off and started it back up again and the CEL was gone, still idling good.
My question is: What do I need that plugged in for with OBD 1? I thought the OBD 1 ECU didn't have EVAP controls... Sorry that was so long.
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Re: OBD 2 -> OBD 1 conversion... EVAP control???? (jdmhonda)
So what is going to happen if I leave the EVAP purge control solenoid unplugged? Will it waste gas or ruin the system or something? I don't want it to ruin the system, I have to get it smog tested in a couple of years.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhonda »</TD></TR><TR><TD CLASS="quote">the obd1 iacv has two wires and obd2 has 4.</TD></TR></TABLE>
My OBD 2 IACV has 2 wires, I think only the auto has three. It seems to be running ok now, no CEL snd it's idling ok. I'll wait to see what happens when I start it cold tomorrow.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhonda »</TD></TR><TR><TD CLASS="quote">the obd1 iacv has two wires and obd2 has 4.</TD></TR></TABLE>
My OBD 2 IACV has 2 wires, I think only the auto has three. It seems to be running ok now, no CEL snd it's idling ok. I'll wait to see what happens when I start it cold tomorrow.
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Re: OBD 2 -> OBD 1 conversion... EVAP control???? (CycloneBlue_1.6EL)
something you might be willing to try is what i did on my ls ... that same valve i have but becuz my car is obd1 i took a vacuum cap and capped of the ends of it and just unplugged it .... car runs great and i ctually have etter response from the car period.....
Hope that helps Good luck
Hope that helps Good luck
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Re: OBD 2 -> OBD 1 conversion... EVAP control???? (LSegHatchy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LSegHatchy »</TD></TR><TR><TD CLASS="quote">something you might be willing to try is what i did on my ls ... that same valve i have but becuz my car is obd1 i took a vacuum cap and capped of the ends of it and just unplugged it .... car runs great and i ctually have etter response from the car period..... </TD></TR></TABLE>
Vacuum cap? Please elaborate...
Vacuum cap? Please elaborate...
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Re: OBD 2 -> OBD 1 conversion... EVAP control???? (CycloneBlue_1.6EL)
I just looked at the wiring diagram, and one of the wires goes to the ECU, the other to the alternator SP sensor... hmm.
#9
what is it that connects too the evap?Is it a vacuum or wire?If its a wire,i would just unplug it and since you said its fine i would drive it like that for a few days.See how the car performs and gas mileage,etc.Its probably not a vacuum because the rpms would tend too go up...
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Re: (SOHC_MShue)
I think the reason the CEL was on was because I tried unplugging the IACV before the EVAP purge control solenoid, once I plugged the IACV back in, it must have stayed on. I was going to pull the code, but the light was gone when I restarted.
It seems to be running ok now, I just wanted to know how that would affect fuel mileage and performance.
Does everyone who converts to OBD 1 from OBD 2 have to disconnect that thing?
It seems to be running ok now, I just wanted to know how that would affect fuel mileage and performance.
Does everyone who converts to OBD 1 from OBD 2 have to disconnect that thing?
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