Drop_A_Dookie

i have been having a problem with my idling on my 98 civic, also a problem with not being able to keep steady speeds. i know this is all symptoms of the 3 wire iacv to 2 wire. i did the conversion and still have the same problem. i have a 98 hatch with a b18b1 motor with a obd2a to obd2b jumper harness too fyi. someone help!!!

Former User

Fix the wire conversion.

Drop_A_Dookie

i checked it multiple times. i did mine like this http://hondaswap.com/attachments/6d1...15-iacvfix.jpg i didnt know if the obd2a to obd2b harness had anything to do with it

Former User

The diagram at the link is for OBD2a. What part of your system is OBD2b? Give all details about your set up.

Do you have code 14?

Drop_A_Dookie

my wire harness and car is a obd2a but im running a obd2b ecu so i have a jumper harness on there.

Former User

So now describe exactly what you did to accomodate the OBD2b ECU for the IACV conversion.

Former User

Drop_A_Dookie

not sure im running a aem ems and no check engine light comes up

Former User

Are you saying that even if there were an IACV circuit problem, code 14 would not be thrown?

Describe your wire conversion in detail. Post pictures.

Drop_A_Dookie

ill try to get some up asap

Fliptard

Same issue with mine, b18c1 into 96 CX, 5-speed swap. Had an LS before. NO issues. Used the iacv from ls and the gsr started surging, no codes were thrown. So... I mad a blockoff plate between the iacv and intake mani...

EF9_TryMe

Fix the wire issue after your obd2b connector which means your starting with the obd2a
harness. The jumper harness linked to obd2b is going to automatically compensate for
this once you wire up the IACV to the original car harness(obd2a.)

Drop_A_Dookie

ok so i cut the A13 wire and just left it alone. i cut the A14 wire and wired it directly to the wire on the other side of A12. should just be that simple right?

Former User

Problem 1) There should be two Blk/Blu wires spliced together at the A12 pin, but I don't see that in your picture. I instead see two Blu wires spliced together at that pin. Below is a clear illustration of what needs to be done at the OBD2a ECU connector.

Problem 2) You are not showing us how you spliced the IACV connector wires.

Problem 3) You need to solder and heat shrink insulate the spliced wires. Your wire splicing job is unacceptably sloppy. Why did you also splice a Grn wire to to a Blk wire in the picture?

Drop_A_Dookie

The black/blue wire is the A14 wire. Its connected to thr other side of A12. Its green because the jumper harness is green. Sorry i should of put a better picture up. Also thr blue eires disregard those. That was a ccident, i cut the wrong one lol

Former User

As this^ is not completely understandable, helping you is nearly impossible. The bottom line is that you made a horrible mess of the wiring and now you need to fix it, the right way:

You also have ignored these points:

Drop_A_Dookie

here are some pictures to hopefully help? i could not get a picture of the actual wiring at the iacv because it is all shrink wrapped and tucked under the manifold. the wires by the ecu are not taped up/ or shrinked wrapped yet because i was just testing it to see if it would work. once its idles fine then yes it will get soldered and heat shrinked

Former User

The A14 splice is the main concern. The A14 Blk/Blu wire should be moved to A12. Instead, it appears that you bypassed the OBD2a connector and spliced the A14 Blk/Blu wire to a green wire from the conversion harness. Is this correct? Why did you do this? The problem is that I cannot verify that you chose the correct green wire to splice with the A14 wire because you have not described how you made this choice.

We can also only assume that the IACV connector splicing was done correctly.

Finally, a bad IACV conversion is expected to throw code 14, but there is no code. Why?

grumblemarc

iTrader: (4)

So you have no pictures of the wiring for the IACV? How are you supposed to get help then?

Drop_A_Dookie

i picked the wire that was directly behind the A12. and just moved the A14 directly to there. also yes with the aem ems for some reason no check engine light comes up even though i know i do have a check engine code. the next step ill probably have to take is removing the manifold and take some pics of the iacv wiring for you. i know its kinda hard to help me lol

Former User

How do you really know code 14 is thrown? Don't assume. If there's no code, then you are chasing a red herring.

You need to figure out whether code 14 is really thrown.

Drop_A_Dookie

i just assumed it was the iacv i guess. i cant keep steady speeds, and when i unplug the iacv it does nothing.

Former User

When you have technical problems, assumptions are very dangerous and often delay pinpointing the problem. If code 14 is not thrown, then you are most likely on the wrong track.

grumblemarc

iTrader: (4)

Maybe you need to get that EMS tuned huh?

Drop_A_Dookie

no has a stock map on it right now