I somehow doubt this can be answered...

Im having a very, very annoying stalling issue - stalls at lights and just anytime it returns to idle from open throttle.
Original 6pg thread here:
https://honda-tech.com/zerothread?id=1975745
Engine is a B18 LS - Stalls on factory virgin P75 ecu, but not on p2p

Summation:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pdiggitydogg &raquo;</TD></TR><TR><TD CLASS="quote">LIST OF WHAT IT ISN'T:::
TPS is within spec in voltage and resistance (1&2, 2&3)
Vacuum is ~20inHg
Compression in each cylinder is between 150-155 (wiseco flat's)
Its not a vacuum leak.
New plugs, new cap and rotor.
NGK plug wires (also tried parts store)
Fuel filter is maybe 1yr old.
I was using the same good, clean IACV and gsr TB on my d16 without any issues, before.
Always starts right back up.
It idles just fine, around 800-1000.
No codes
Stock ecu (5sp)
Standard 240cc injectors
Stock fuel pump
Fuel Pressure = Idle: 40-ish, Open throttle: 50-55
No change from using different FPR's
Adjusted valves: .006 Intake .008 Exhaust
Theres no pcv - endyn breather/catch can
Was leaking h2o into runner 4....sealed that w/ RTV...still stalls
Its not the brake booster check valve
Clean air filter, but also does it with no intake arm/bare TB

<FONT COLOR="red">It seems to run just fine (aside from codes) with a P2P ecu
WHY DOESNT IT WORK WITH THE PROPER P75???</FONT>
I have tried 2 virgin obd1 p75's and both end in the same result....
</TD></TR></TABLE>

ANYWAYS....
I really just want to know if there is any sort of IACV response time difference between the OBD1 P75 and the OBD2A P2P?
Thats really what its getting down to....

I have thought it may be the obd jumper harness, but the wires check out, with no real measurable resistance at the iacv pins


Modified by pdiggitydogg at 2:25 PM 6/14/2007

 

....

 

there shouldn't be any difference. the hardware in the ECU is spec'd very close to the same, and the software in the ECU should have no problem catching the idle it if it's dropping. (you have PM BTW)

 

Is it originally an OBD-1 or OBD-2 IACV? I am betting on OBD-2.

 

i honestly dont know
the original one went bad and I bought a used one from the marketplace
it probably is obd2

 

not to grind that train of thought to a standstill... but I use an OBD2 IACV behind an OBD1 ECU. (many people do...with OBD2-OBD1 conversion harnesses)
have you pulled the IACV and put 12V across the terminals to make sure that the IACV slides all the way to the side. I had one that slid a little ways then cocked to the side. All though it caused the typical surging idle.

 

i havent done that, no
i figured it worked, because it clicked and didnt have problems before...but i guess i'll try that soon

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">not to grind that train of thought to a standstill... but I use an OBD2 IACV behind an OBD1 ECU. (many people do...with OBD2-OBD1 conversion harnesses)
</TD></TR></TABLE>

I do as well, but I also need to set the duty cycle to -12 in Neptune to attain normal operation.

 

I did not have this problem when I ran a stock p28 on my d16y8 using the same iacv

 

is the ecu chipped? What rom are you running if it is? In my car i had a mild (once a day) stalling issue that disapeared once i adjusted the timing in the map. I haven't had a chance to read through the other thread yet but I'll see if i have a chance.

 

virgin p75

 

That's might be part of the problem. The fuel values are completly different in that region. It's going to be harder for the engine to recover with the "wrong" information.

 

why have i never heard of this happening before?

why didnt I have this issue with a stock p28?

 

Because a P28 is mapped out for a D16. Now if you add in the longer stroke and higher oment of inertia that a B18 has it will carry itself through a near stall and recover much easier than a D16 would. I'd be willing to be that if you had someone burn a chip for you with p28 code in it for your p75 that you would have no problem whatsoever.

 

So what about every other person running a p75 who isnt experiencing this?

I pm'd mtber from Phearable.net, who said that he'd never seen or heard of this before.
Im waiting for any thoughts from Katman too
I figure if its truely ecu related, map wise, either of them will know

 

it could be map related but I highly doubt it. A P75 had no issue idling my C5 swap. (I tried it since I read about your problem)
Heck even a stock P28 had no problem idling it.
With a P05 and P06, it didn't die but it was close.

 

Thanks for that
I need to PM madeiniraq again...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">it could be map related but I highly doubt it. A P75 had no issue idling my C5 swap. (I tried it since I read about your problem)
Heck even a stock P28 had no problem idling it.
With a P05 and P06, it didn't die but it was close.</TD></TR></TABLE>

yeah but we are talking about a D16

 

?
engine with trouble is a b18

 

Oh for some reason i thought it was a D series we were talking about.

 

sorry thats my mistake i guess i didnt list it
Its a b18b that stalls on its own programming

 

no one else?