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3 wire to 2 wire iacv problem, cel p1509

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Old 06-13-2009, 10:10 AM   #1
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Default d16z6 obd1 motor in a 99 ek obd2b doesnt idle ryte

Okay i have a d16z6 obd motor in a 99 ek obd2b car. I got the engine running but it bogs out wenever i rev it. Im getting a cel code for the iacv. not sure if this is the problem. could it be a vacuum leak. Anybody ever done this swap.

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Old 06-14-2009, 06:38 PM   #2
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

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Old 06-14-2009, 08:33 PM   #3
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

What model is your "99 EK"?
What ECU are you using?
Are you using your original engine wiring harness from the car?
What intake manifold and throttle body are you using on the Z6 motor?
Are you 100% sure the IACV you have is in perfect working order?
How is the motor running at idle? Is the idle steady or does it surge?
What exactly do you mean it bogs when you rev it? Is this at a stand still in neutral or when driving?

To check for any vacuum leaks, look and feel all around the intake manifold for any nipples not being used. If those check out fine, spray some carb cleaner around the gasket area and at every vacuum source. If there is a leak, you will notice the idle will change (I believe it drops in idle, but I can't quite remember).

Please answer those questions as best as you can than we will continue.
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Old 06-15-2009, 09:14 PM   #4
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

its a 99 ek ej6, dx i believe, had a d16y7 previously
im using the stock p2e ecu
Yes i am using the original stock harness
im using the z6 intake manifold, stock throttle body
almost 100%, i can hear it working, already cleaned it
It runs good at idle, steady
okay this is what happens.( at a stand still) i will rev it slightly = good, i rev it more and it bogs out, its like a hesitation, then if i rev it a little more it is fine.

i have a few nipples that are not used, i have no idea where they go to. off the top of my head i do remeber that the one on the throttle body isnt bieng used. i will post pictures if needed,

Thanks in advanced.
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Old 06-16-2009, 07:02 AM   #5
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

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Originally Posted by stkinge View Post
its a 99 ek ej6, dx i believe, had a d16y7 previously
im using the stock p2e ecu
Yes i am using the original stock harness
im using the z6 intake manifold, stock throttle body
almost 100%, i can hear it working, already cleaned it
It runs good at idle, steady
okay this is what happens.( at a stand still) i will rev it slightly = good, i rev it more and it bogs out, its like a hesitation, then if i rev it a little more it is fine.

i have a few nipples that are not used, i have no idea where they go to. off the top of my head i do remeber that the one on the throttle body isnt bieng used. i will post pictures if needed,

Thanks in advanced.
First off, are you using any other fuel/VTEC controller along with your DX P2E ecu? You need a 99-00 EX 5spd manual ecu P2P asap! Or at least a OBD1 P28 with obd2b to obd1 ecu jumper harness.

The P2E ecu will always look for a 3-wire IACV sensor no matter what. It doesn't matter if you convert it to a 2-wire IACV on the wiring harness. This is why you have the IACV malfunction code.

You can do 1 of 2 things:
- If you can not get a hold of a P2P or P28 ecu, Undo any of that 2-wire IACV modifications, find your old D16Y7 throttle body and replace that Z6 throttle body (use the Y7 throttle body gasket if you use the Y7 TB). Reason to do this, is because the Y7 TB has the 3-wire IACV on there. This will get rid of your IACV code, but the ecu is still not correct for your motor, but it will get you by at least.

- What I do recommend is just find a P2P or P28 ecu. This will get rid of your IACV malfunction code (if you did the conversion correctly). Also, you will have the VTEC function if you wired it.

From what I remember, a Y7/Y8 motor runs on a different degree of timing than any obd1-obd0 single cam motor. This could be causing bog / hesitation issues using that P2E ecu.

On the throttle body there should be 2 coolant hoses on the bottom. 1 comes from the small coolant nipple on the intake manifold flange where the big coolant hose is, goes to the coolant nipple of the TB, than out the back coolant nipple than to a coolant nipple of the IACV, than out other coolant nipple of the IACV than to the back of your block where the big coolant tube is.
The nipple on the top of the TB goes to the EVAP charcoal canister located on the firewall.
On the intake manifold, the big nipple on the back goes to your brake master cylinder obviously, the big nipple on the front goes to the PCV valve that is right underneath the intake manifold, and the small nipple goes the the FPR. I am pretty sure that is all the nipples on the intake manifold. I believe I have a spare manifold somewhere so I can see if there is anything I am missing.
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Old 06-16-2009, 09:56 AM   #6
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

no im not using any fuel/vtec controller
also i do have a p28 with a jumper harness, exept it runs worse with the p28, the car will start then die, it wont stay on longer than a few seconds. the p28 used to be auto but i changed it to manual by removing a resistor and jumpering another ( see attachments ).i dont know if this may be the problem, also do i need to remove the ckf bypass trick and iacv 3 wire to 2 wire wiring when i use the jumper harness. as for the vac lines, im sorting those out right now.
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Old 06-16-2009, 10:11 AM   #7
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

okay i think i have all the vacuum lines correct. exept for one, i think it is the purge sensor, i dont know where this goes to. heres a pic of it, also could u take pics of the vac lines just so i could double check
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Old 06-16-2009, 10:49 AM   #8
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

You might get more feedback with a more appropriate title. For example, this might work better:

Engine bogging: 99 Civic with D16Z6 and p2e ECU
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Old 06-17-2009, 11:12 AM   #9
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

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Old 06-19-2009, 09:27 AM   #10
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

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Old 06-19-2009, 10:01 AM   #11
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

You can change to a more appropriate thread title using the advanced editing function. Otherwise, many will not read the thread because they think it's just another IACV problem, which it is not.

I think Mr.Quang has already made some excellent suggestions that you should pursue. It also seems to me that you should be using the P28 ECU, even though you mention that the engine does not run with it. With the P28 ECU installed, does the CEL remain ON after several attempts to get the engine started? If so, have you pulled the CEL codes from the ECU? Have you also checked whether the mechanical timing of the D16Z6 engine is dead on, that is the cam and crank are perfectly synchronized at TDC1?
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Old 07-13-2009, 03:03 PM   #12
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

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Old 06-10-2010, 10:31 PM   #13
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Default Re: 3 wire to 2 wire iacv problem, cel p1509

I fixed this same problem on my sisters 98 sedan...thing would bog wen I throttle the gas but when it's slow throttling it's fine...figured out what the problem was....bad spark plug wires.... Check the specs on yours, it might be worth a shot...

Hey RONJ!!!! What up!?!?
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99, 9900, big, code, dx, ek, engine, harness, honda, iacv, p1509, p2p, wire, wiring, z6

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