H22 Swap Question

[cis8vgti]

Like several members, I am trying to trouble shoot a H22A4 swap into a CB7 Accord (1993 EX). I picked up this car in an interesting multi trade/sale CL deal. Anyway, I am getting close to the car actually running.

Solved 1st problem: No fuel to rail due to bad main relay.
Solved 2nd problem: Exhaust cam jumped timing. Reset timing.
3rd problem: Car only starts with starter fluid?

I am going to get a noid tester this week to see if injectors are firing. I have 12v to the injector harness. I have 5 OHMS to the 4 leads on the injector resistors. What else should I check?

This engine does not have a CPS on the block.
The car is using a P06 ECU
I see three grounds, including the thermo housing ground
The car has an external coil.
The harness was in the trunk. I tried to wire it up the nest I could. I do not understand why Honda makes plugs that fan fit on more than one sensor.

Any help is appreciated.

[GhostAccord]

I it starts with spraying fluid in the intake you have yourself a fuel issue.

What fuel injectors are you using? The ECU is the ground for the injectors. Make sure the wiring is good and tight. and that all of your grounds are connected and that they are clean and tight.

[cis8vgti]

I did not pull the injectors so I can only assume I have stock H22A4 injectors. I can pull the injectors if I need to provide more info to help with diagnosis.

The ECU is just sitting on the floor of the car, not bolted in and under the floor carpet. I will clean the ECU and harness connectors, reattach and bolt it down before I rent the noid switch.

I will report back once this is done.

[deevergote]

H22A4 injectors require you to bypass the injector resistor box that is stock on your car. If you don't want to bypass the resistor box, you'll need H22A1 injectors.

Also, since you seem to be quite knowledgeable, I assume this question is unnecessary... but I'll ask just in case... Your P06 has been modified and tuned for the H22A, correct? With VTEC circuitry added? A stock P06 is tuned for a 1.5L non-VTEC engine, so it would be a very bad idea to run your H22A on that (I did once encounter a guy with a turbo F22A running a bone-stock P06 ECU asking why his engine wasn't running properly.)

To make things easy, especially for the initial startup, OBD1 H22A injectors and an OBD1 P13 ECU would be your best options.

[cis8vgti]

Unfortunately, I received this car 'as traded'. I did not do the swap nor do I know what was done to before it fell into my lap. I am blindly trying to work through a check list of possible issues.

If cleaning and securing the current ECU does not work, I will open it up to see if it was modified. I will then reseach the web to see what a possible modified P06 ECU looks like.

Can you tell me what cars come with a P13 ECU?

[GhostAccord]

Before you waste your time mounting the ECU you might want to open up the cover and make sure it has been modified. Even in saying that, if you have no way to tune it or monitor how the ECU is running the engine I would stop what you are doing with an unknown ECU.

P13 ECU cam in the 92-95 VTEC Preludes. 96 and up have immobilizers installed in the ECU and are not recommended.

When you open up the P06 there should be items soldered into the bottom right quadrant of the board as shown in the image below.



Or there could be another circuit board mounted in that area as well.

[deevergote]

Ugh. Other people's projects are the worst!

Yeah, the P06 is a 92-95 Civic LX/DX ECU. Very, VERY wrong for the H22A unless properly converted and tuned. You may be able to start it on that ECU if it's unmodified, but I wouldn't drive it that way. If the previous owner drove it on a virgin P06, there may be internal damage.
Seeing as this is someone else's work, that presents countless potential problems that we could only guess at. You're brave for taking on such a thing!

Take a look at the H22A swap guides on this forum, and work backwards. Make sure the previous owner did everything correctly, and fix whatever he did incorrectly. The H22A swap requires some wiring modification, so definitely take a look at any custom wiring work that has been done.

[cis8vgti]

GhostAccord and Deevergoat hit the nail on the head.

I pulled and opened the P06 ECU and it appears to be stock or unmodified.

There is nothing added to the areas marked in white as provided in the picture by Ghost Accord. I flipped the ECU over, removed the cover and I do not see anything that may resemble non factory solder marks.

I can only assume someone pulled the correct ECU and replaced it with this one. ImHO, This car has too many nice mods for someone to flake on the ECU. So it looks like I have to either buy a P13 or chip the P06.

While digging, I also noticed two wires coming through the firewall and added to the ECU connectors. One of the wires looked frayed so I followed them to under the hood. One wire is connected to the VTEC solenoid. This may be correct as the old 93 Accord did not have VTEC. The other wire has a missing connector and is not plugged in. I think this wire is going to s coolant sensor at the back of the thermostat housing. I have a mental note to fix the connector and frayed wire.

I am a VW/ Audi guy so please have patience when I ask or do something stupid.

[deevergote]

If VTEC wiring has been added, then it definitely seems that the previous owner swapped out ECUs before selling the car. Pretty shady, especially since the ECU included could've done damage. It's probably a good thing you're having trouble getting it started!

Please, continue with the questions. You clearly do your research beforehand, and your questions are clear and detailed. Everyone here is perfectly happy to help! There's a HUGE difference between someone that is learning something new and someone that is unwilling to learn.

[h22sparkle]

I think you need to post pictures and post it up here for us to see.

[thumping_accord]

Also something to think about, if you are still having a hard time getting the car to run on its own fuel after the ECU fix, you can see about cleaning your injectors. When I swapped my H22a one injector was clogged so I had to clean them out. and if you are swapping injectors from an h22a1 it might not be a bad idea to clean them while they are out. Just my two cents.

[cis8vgti]

I ordered the P06 chip kit last night from eBay. The seller from Cali (Phea-something) seems to be legit. I also seen a few internet post about his products, so I am going to give it a go. I ordered the $49.99 kit that includes a burned chip that has a list of features.

I hope I did not damage the old ECU by cranking on it. If so, I will grab a P06 from another car I have now that I know where this version comes from.

I do not know what a H22A1 injector looks like. I could already have these injectors, who knows. I will research the part number for the H22A1 injectors and see if they match mine.

I appreciate everyone taking time from their busy day to chime in and help me. I'll post pics of the P06 ECU before and after my soldering job.

[wagon-r]

I doubt you can damage an ECU by cranking on it. The ECU neither knows or cares if the engine is actually running (except to set OBD codes).

As for H22A fuel injectors. I don't know of any way to tell them from F22/H23 injectors. In fact, I had a guy sell me H23 injectors, claiming they were H22 injectors. I caught it because I sent them out to be cleaned and balanced before I installed them in my build. Even got a refund from the seller.

[GhostAccord]

I ordered the P06 chip kit last night from eBay. The seller from Cali (Phea-something) seems to be legit. I also seen a few internet post about his products, so I am going to give it a go. I ordered the $49.99 kit that includes a burned chip that has a list of features.

I hope I did not damage the old ECU by cranking on it. If so, I will grab a P06 from another car I have now that I know where this version comes from.

I do not know what a H22A1 injector looks like. I could already have these injectors, who knows. I will research the part number for the H22A1 injectors and see if they match mine.

I appreciate everyone taking time from their busy day to chime in and help me. I'll post pics of the P06 ECU before and after my soldering job.

Did the chip kit you bought come with the additional parts to add VTEC to your particular board?

If I had known you were looking to solder the ECU I would have referred you to xenocron.com. Chris's basemaps and chipping kits are legit. Ebay can be really hit or miss.

[deevergote]

Phearable? Probably one of the best supppliers of chipped ECUs and chipping hardware (Moates is another good one for hardware.)
For the P06, you're definitely going to need the stuff to add VTEC, since it is a non-VTEC ECU (the P28 is more commonly used.) Neither ECU has circuitry for IAB control (the secondary runners in your intake manifold), so that should also be added for things to function as intended. The Integra GSR's P72 ECU is the best chipping option, as it comes with VTEC and IAB circuitry... but it is a pricey one, especially now that they're getting older and harder to find!
If you do need to get another ECU, be sure you get something 1995 or older. The 1996+ ECUs cannot be chipped.

For the injectors, check to see what the previous owner did with the injector resistor box. That MIGHT give you a hint as to what injectors he used (assuming he didn't swap them out before he sold the car, as he did with the ECU...) Look for this guy here:

Check to see if it's still in the bay, and still hooked up. If he retained the box, the injectors SHOULD be OBD1 H22A1 injectors. If he bypassed the box, then the injectors are likely to be the OBD2 H22A4 injectors. Either are usable (though I'd prefer using the OBD1 injectors, just to eliminate issues with custom work... don't fix it if it ain't broke!)