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View Full Version : jdm b20a on a20 ECU help


Versanick
04-30-2006, 11:58 AM
So my car's put together. BLOX manifold, LS throttle body (same voltage TPS .5v >>> toward 0v at WOT), LS fuel rail, LS fuel pressure regulator (until we get it running, we won't use the B&M adjustable yet), and all a20 electronics and vacuum, vac. advance 86 integra dizzy, and so on.

Friday night, the car ran with 0 check engine light. No blinks of it, no solid light, nothing. That PGM-FI just stayed off. Idled like a dream. purred like a kitten, 450rpm put put put put (you can hear the cams). So here Chuck goes, whacks down the pedal, and it starts pulling... 1500 2000 2500... and then NO more torque after 2000 all the way into 6000... he didn't want to take it to the rev limit because he didn't think it sounded like it would make it there. Felt like a 98hp a20 motor. But at least it ran.

Okay, so maybe the gasoline in the tank has been sitting there since last August, and there's no way the a/f ratios are exactly what we need them to be. But the entire wiring harness has been replaced, new distributor, replaced spark plugs, and everything else is hooked up and properly, including MAP sensor, the distributor vacuum advance, and so on.


Over the winter, I accidentally hooked a battery up backward for a few seconds. Lots of smoke came from the MSD box (and I assume I broke it, so we took it out), and the main relay blew (which I replaced).

Could I have fried my injector resistor box? Anyone else have any ideas on what's making this run like crap?

We're going to make sure I have fuel pressure (enough of it anyway) and get some fresh gas in the tank, then recheck all the relays. But I don't know what else to do!

Sorry for the long windedness. Thanks for reading!
-that kid with the always running-like-crap b20a hatch.
thegreatdane
04-30-2006, 12:55 PM
Why not just put your B20A distributor back in and use an OBD1 ecu instead. Chip it and tune it with crome. Instead of trying to make it run with a setup that's never going to get that engine running right.
Versanick
04-30-2006, 08:05 PM
Mostly because then I'd need a 4-wire O2, a change of idle controls, an obd1 distributor, an obd1 ECU, and all the time to have it put together by Friday. This is a project for Friday, May 5. It's traveling 3.5 highway hours on that day.

But that's my long-term goal, I think. I was just going to get an SAFC.

Update: the injector resistor box being replaced didn't help. And it's not out of gas. And the fuel pump is reportedly making gurgling noises.
thegreatdane
05-01-2006, 04:08 AM
Mostly because then I'd need a 4-wire O2, a change of idle controls, an obd1 distributor, an obd1 ECU, and all the time to have it put together by Friday. This is a project for Friday, May 5. It's traveling 3.5 highway hours on that day.

But that's my long-term goal, I think. I was just going to get an SAFC.

Update: the injector resistor box being replaced didn't help. And it's not out of gas. And the fuel pump is reportedly making gurgling noises.

No you dont need a 4 wire O2, you can disable that and just use your 1 wire O2 or even no O2 at all. You dont need to change idle controls. You already have an OBD-1 distributor in your B20A distributor. So you just need a chipped ECU.

But yea you wont get that done by friday.
carotman
05-01-2006, 06:50 AM
You could use a PK2 ECU with my B20A chip :p
Versanick
05-04-2006, 07:36 AM
I keep thinking more and more pk2 ecu with carotman's ph3 special. The distributor from it, I can understand will be needed. I'll have to do some research as to whether I need the injector resistor stuff intact, and whatever else needs to be changed.

I think we have it running. I had MSD which sparks through 20 degrees of crank instead of once (at idle/low rpm) and so I probably WASTED my plug wires and plugs over the course of two years (although I've gone through 4 sets of plugs anyway). So I think we figured out that this was the problem.

Thanks for all the input.
carotman
05-04-2006, 10:42 AM
Well, In case you want to try it, here's the PK2 special ROM with PH3 fuel/timing maps.

Carotman's Special ROM (http://carotman.no-ip.com:8888/ecu/pk2-ph3.bin)


Like I said, I will try to completely convert the PK2 to a PH3 ECU this summer. It would allow us to use the OEM manifold with a single O2 sensor instead of dual sensors like the PK2 needs.

So far, this has only been a theory but using the unmodified PH3 code and rigging a diode in the secondary O2 driver would convert a PK2 to PH3...

If you need help to chip the ECU, just tell me, I'll gladly do it for you.