F23 swap in Gen 5
#31
jorgelm86, according to the factory service manual, a DTC 4 is "a problem with the Crankshaft Position (CKP) sensor circuit."
Since you didn't swap out the ECU, and you kept the old distributor and coil from the F22B2, I don't think the DTC 4 is related to the swap. It may be that you just have failing distributor. Have you cleared the ECU memory to see if the CEL goes away? Do you have a factory service manual to troubleshoot?
Not everyone. No problems running a virgin factory VTEC ECU. Runs strong. Great DD.
Since you didn't swap out the ECU, and you kept the old distributor and coil from the F22B2, I don't think the DTC 4 is related to the swap. It may be that you just have failing distributor. Have you cleared the ECU memory to see if the CEL goes away? Do you have a factory service manual to troubleshoot?
I used a chipped P28 ECU (I used to chip them and tune them myself). Then I just ran a stock map for an F23 with slight tweaks. Ran super strong with no problems.
I guess I never realized how fortunate I was with how strong it ran. Now I'm seeing everyone's having problems with the swap and it makes me wish I still had my car lol
I guess I never realized how fortunate I was with how strong it ran. Now I'm seeing everyone's having problems with the swap and it makes me wish I still had my car lol
#32
It's OBD1 so as far as wiring it in its a direct swap because the plugs are the same. (I'm assuming you're still OBD1)
As far as tuning it, your best bet would be to find someone around your area that has experience with tuning.
#33
jorgelm86, according to the factory service manual, a DTC 4 is "a problem with the Crankshaft Position (CKP) sensor circuit."
Since you didn't swap out the ECU, and you kept the old distributor and coil from the F22B2, I don't think the DTC 4 is related to the swap. It may be that you just have failing distributor. Have you cleared the ECU memory to see if the CEL goes away? Do you have a factory service manual to troubleshoot?
Not everyone. No problems running a virgin factory VTEC ECU. Runs strong. Great DD.
Since you didn't swap out the ECU, and you kept the old distributor and coil from the F22B2, I don't think the DTC 4 is related to the swap. It may be that you just have failing distributor. Have you cleared the ECU memory to see if the CEL goes away? Do you have a factory service manual to troubleshoot?
Not everyone. No problems running a virgin factory VTEC ECU. Runs strong. Great DD.
#34
I got an extra 1mpg in city driving going from the old F22B2 to the F23A1; probably because of the milder VTEC lift at lower RPMs. Highway mileage is the same as the F22. 34mpg is awsome. I can hit maybe 31 or 32 driving 65 on the highway but the speed limit in CO & UT is either 75 or 80mph so I tend to get 28mpg at those speeds.
jorgelm86: With a non-VTEC ECU, your car should run fine up to 4000rpm and then run out of breath due to a lack of VTEC. I ran mine for a week or so like that with no problems. To get the VTEC working, you'll need replace your ECU and wire the VTEC solenoid and VTEC oil pressure switch. I think '94/'95 EX (VTEC) used a P0A.
jorgelm86: With a non-VTEC ECU, your car should run fine up to 4000rpm and then run out of breath due to a lack of VTEC. I ran mine for a week or so like that with no problems. To get the VTEC working, you'll need replace your ECU and wire the VTEC solenoid and VTEC oil pressure switch. I think '94/'95 EX (VTEC) used a P0A.
#35
Roader i have clear the ecu but the cel keeps coming up im also getting code 43 ... and no i dont have a throuble shoot... ok thanks im going to the junkyard this weeken does the ecu off the ex have to ve stickshift... and i will also need help on how to do the wiring....
Last edited by jorgelm86; 05-03-2013 at 03:03 AM.
#37
DTC 43, not DTC 4? Here's what the FSM says about DTC 43:
Troubleshooting the fuel system is a bit more involved. The DIY sticky has a link to online manuals:
Online Manuals
I can't imagine that this problem is specifically related to the swap, especially since you used the F22 intake manifold. Maybe something got broken or was left unconnected during the engine R&R. Start with the O2 sensor.
ECU: Not positive since it's OBD1, but I think you do need a manual trans ECU. A quick web search showed 37820-P0A-A01 as the part number. Wiring VTEC isn't all that difficult. Cut the harness out of the ECU donor car if they'll let you & be sure to include the solenoid (VTS) & pressure switch (VTP) plugs & pinned ECU plugs when you do. Try to keep the harness in one piece without cutting the VTEC wires. Then just unwrap the tape, remove the plastic wire loom, and extract the intact VTEC wiring harnesses. I just ran both wires separately through the firewall grommet that holds my amp power wire. I think the wiring is D6 (VTP) and A4 (VTS). You should be able to find an OBD1 ECU pinout online to help you identify the plugs & pin locations.
A good how-to on OBD1 ECU plug pin removal:
phearable(dot)net/tech/wiring/obd1pinremoval(dot)jpg
A problem in the heated oxygen sensor circuit (HO2S), or a problem in the Fuel Supply System.
The O2 sensor should be fairly straightforward: Is it hooked up? Is the heater circuit open?Troubleshooting the fuel system is a bit more involved. The DIY sticky has a link to online manuals:
Online Manuals
I can't imagine that this problem is specifically related to the swap, especially since you used the F22 intake manifold. Maybe something got broken or was left unconnected during the engine R&R. Start with the O2 sensor.
ECU: Not positive since it's OBD1, but I think you do need a manual trans ECU. A quick web search showed 37820-P0A-A01 as the part number. Wiring VTEC isn't all that difficult. Cut the harness out of the ECU donor car if they'll let you & be sure to include the solenoid (VTS) & pressure switch (VTP) plugs & pinned ECU plugs when you do. Try to keep the harness in one piece without cutting the VTEC wires. Then just unwrap the tape, remove the plastic wire loom, and extract the intact VTEC wiring harnesses. I just ran both wires separately through the firewall grommet that holds my amp power wire. I think the wiring is D6 (VTP) and A4 (VTS). You should be able to find an OBD1 ECU pinout online to help you identify the plugs & pin locations.
A good how-to on OBD1 ECU plug pin removal:
phearable(dot)net/tech/wiring/obd1pinremoval(dot)jpg
Last edited by Roader; 05-03-2013 at 09:27 AM. Reason: Typo
#38
i have actually just completed my f23a1 swap in my 94 accord. I just took the intake manifold with everything on it from the f22 and slapped it on, then i put my headers, f22 distributor, f22 ecu, original accord plumbing, wiring, ect. Started right up after fuel pressure built back up, will have to get better plugs and wires, i think the dust got to them lol
#40
Passed first emissions test since swap. All readings grams per mile:
- HC limit: 1.20, HC measured: 0.22
- CO limit: 15.0, CO measured: 2.8
- NOx limit: 2.00, NOx measured: 0.97