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Anyone use Hondata with a 90-91 distributor?

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    #1

    Anyone use Hondata with a 90-91 distributor?

    I'm becoming increasingly frustrated by a Code 9 (CYP cylinder position) that I can't get rid of. I have a Hondata 300 v2 and a 1991 Accord distributor. I swapped in a known good ECU with Hondata and it also threw a code 9, so I know it's not my ECU. I just put in my 3rd distributor - this time a new one - and the code 9 is still there (although it only occurs below 1500 rpm).

    Is there a difference in the CYP sensors between the 1990-1 and 1992-3 distributors? I know Honda moved to an external coil in 1992, but they are both TEC distributors and the CYP resistance specs are identical.

    So, has anyone used Hondata with a 1990 or 1991 Accord distributor?
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    #2
    i would maybe check your wiring?

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      #3
      No problem here, I have a 90 with S300 v3. Like 93redcb7 suggested, I would check your harness. But I did have an issue with an AEM not giving me spark, I believe it had something to do with voltage ems reading. But can't remember for sure.


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        #4
        this may sound funny but how is you ground on the thermostat housing and is the thermostat housing bolted to the intake manifold properly? another thing to consider may be to check the ground to the transmission. i had a code 9 a long time ago and i replaced my ground to the trans and moved the thermostat ground to the trans, no more problem. i cant guarantee it will cure it but it cant hurt.

        MRT: http://www.cb7tuner.com/vbb/showthread.php?t=95154

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          #5
          Thanks for confirming that Hondata works with the 1990 distributor, Tishock. I won't waste more time and money buying a 1992-3 distributor and converting to an external coil.

          The CYL sensor resistance across the pins at the ECU is exactly the same as the resistance at the distributor, which I take to mean the wiring is OK. And the engine runs just fine. The only reason I"m still trying to fix it is that my tuner won't tune the engine if it has a code set.

          I will check my grounds. I haven't had any problem with anything else, but I can't think of anything else to try.
          Last edited by wagon-r; 10-11-2015, 09:18 PM.

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            #6
            if its reading the same at the distributor and the ECU i would suggest swapping to a known good ECU for testing purposes. even if its just a pt6 or something to start it and see if the code comes up.
            disclaimer DONT DRIVE IT ON A DIFFERENT ECU..--just saying some people arent the smartest lol

            Comment

              #7
              Originally posted by 93redcb7 View Post
              if its reading the same at the distributor and the ECU i would suggest swapping to a known good ECU for testing purposes. even if its just a pt6 or something to start it and see if the code comes up.
              disclaimer DONT DRIVE IT ON A DIFFERENT ECU..--just saying some people arent the smartest lol
              I did that about 4 months ago. One of the guys on Hondata.com was kind enough to meet me in a parking lot. He took his ECU, with Hondata, out of his car and swapped it into mine. It worked fine in his vehicle, but also threw a code 9 in mine.

              As I say, I'm completely stumped. I'm in the process of adding ground wires. I'll let you know if that makes any difference.

              Comment

                #8
                I added two ground wires, just to be sure. Made no difference. I still have the code 9.

                The only other thing I can think of is to replace the wiring from the distributor to the ECU. Hard to believe that this is the cause, though, because the resistance between the CYP wires at the ECU is exactly the same as the resistance at the distributor.

                When I get a chance, I'll run some wires through the window, just to see if it helps before I do anything more permanent.

                Comment

                  #9
                  Finally fixed!!!! It turns out that the ECU must be checking the timing of the signals from the CYP, TDC, and CKP sensors.

                  I am still using the TDC and CKP signals from the crankshaft sensors on my 1997 Accord. When I swapped in the OBD 1 distributors, I installed them so they were in the middle of the adjustment range. The position of the distributor doesn't affect ignition timing (which I verified with a timing light), as this is from the crankshaft sensors. But it does affect the synchronization of the CYP versus TDC/CKP sensor signals. It finally occurred to me today that the ECU might be checking the synchronization of the signals, so I retarded the distributor - viola! Problem solved.

                  So, I feel kind of stupid. I spent a lot of time and some money troubleshooting distributors and ECU, revising wiring, and buying distributors. All I needed to do was rotate the distributor.

                  Bottom line - if anyone is using an S300 in a 1994-97 Accord EX, you need to:
                  - Buy a 1990-91 Accord distributor (internal coil like the 1994-97)
                  - Rewire the distributor signals to the engine harness (I didn't bother changing the TDC/CKP wiring from the crankshaft sensors to the distributor sensors)
                  - If you get a code 9, rotate the 1990-91 distributor to eliminate.

                  I think the distributor in the 1994-97 Accord LX is compatible with the S300, so you don't need to do this if you are starting with an LX.

                  Comment

                    #10
                    Only the OBD2 F22B1/2/6 engines have the crankshaft position sensors on the oil pump. The '94-'95 Accords have them in the distributor.
                    My Members' Ride Thread - It's a marathon build, not a sprint. But keep me honest on the update frequency!

                    Comment

                      #11
                      Originally posted by Jarrett View Post
                      Only the OBD2 F22B1/2/6 engines have the crankshaft position sensors on the oil pump. The '94-'95 Accords have them in the distributor.
                      Correct. But all 1994-97 EX Accords use Hitachi distributors, while 1994-97 LX Accords and all 1990-93 Accords use TEC distributors. The Hitachi and TEC distributors have different resistance specs for the CYP/TDC/CKP sensors. I don't think the Hitachi distributors are compatible with the OBD1 ECUs that accept Hondata modules. My P72 with Hondata threw a code 9 with the Hitachi distributor.

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