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New high idle problem after fixing CTS (and everything else). 200 1989

After changing my coolant temp sensor (and a lot of other things) I had an error code for a faulty coolant temp sensor. I drove around with it for a week like that before I finally got back in there and found a wiring issue with the plug to that sensor. During that week no other codes showed up. Yesterday I found the fault in the wiring, fixed it, and the CTS error code went away. Everything was reading 1-1-1.

Today, I drove down the street and the car started stumbling and hesitating. I checked the codes and now was showing a code for "compensating for rich/lean mixture at idle," 2-3-2. I found that I had forgotten to re-install a hose clamp to the AMM and the hose had come disconnected and was basically in "stumble home mode". Reconnected the hose and cleared the codes. Drove home like butter.

Later I decided to go back and get another smog check. Drove fine to the station, but before the test I checked the codes and there it was again, 2-3-2. I cleared the codes, drove home and checked again, no code. Had some lunch, drove back to the smog check station, checked the codes, there it was again!

The car is idling high when I put it in park (no tach). But other than that it seems to run great. I checked the vacuum hose to the FPR and it smells slightly of gasoline, but not like it was full of gas.

Does anyone have any ideas?
Thanks,
Ryan








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    New high idle problem after fixing CTS (and everything else). 200 1989

    Hi Ryan,

    I see you've "cleared the codes" after each repair. Try resetting the computer. On your 89 you can just remove the 25A blade fuse for a moment to reset the adapting on both ICU and ECU. Then give it about 10 miles.
    --
    Art Benstein near Baltimore

    Always read stuff that will make you look good if you die in the middle of it.








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      New high idle problem after fixing CTS (and everything else). 200 1989

      Well, you have done it again Art. I know you mentioned disconnecting the blade fuse in my post the other day about getting the CTS code to disappear, and I did follow your advice. I just happen to have a quick disconnect on my battery cables, so it is easier for me to just pop the neg cable off than to remove and wrestle open my ipd watertight fuse holder. It didn't click that pulling that fuse resets the computer and doesn't just remove the error code. I also learned (I think) that a diagnostic check on terminal 6 is an active test that is checking the wiring and connections as you test vs. terminal 2 which contains the memory where error codes are stored.

      Anyway, I pulled the fuse, went for a nice 10 mile drive and I'm all 1-1-1 again. Wish me luck on my CA smog check tomorrow. I'm sure I will be on the BB more in the next few days as I try to replace my core support and upgrade to e-codes due to an accident. Trying to get it all done before I head to Veags on Saturday.

      Thanks again,
      Ryan








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        Maybe I spoke too soon Art, problem has returned. 200 1989

        ...maybe I spoke too soon. Went for a drive today and the "too lean or too rich at idle" code has returned. I'm guessing o2 sensor or FPR... maybe TPS?

        I have another FPR from a junker, so I think I am going to throw that in and see if anything changes. I'm just hoping it's not the o2 sensor because I won't have time to order it, put it in, and pass the smog test by tomorrow.

        Any ideas?

        Ryan








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          232 code 200 1989

          Hi Ryan,

          I don't know how to tell what is causing the 232 code. What I do know is, when you change something, you need to reset the computer so it loses the adapting it has done to compensate for the previous condition. Then if the condition returns, you know the computer had a fresh start.

          Just one experience I've had with 232 was fixed when I replaced the intake manifold gasket. I wish I knew a formula to use with those cryptic OBD1 codes, but it seems to me they are never as useful as I'd like them to be. Go with your gut, and if you think it smells rich, and you can easily swap the fuel pressure regulator, you might have the trouble solved. Either way, I try to clear the computer and ride a few miles before taking the emissions exam. I still get nervous, like it is a test in school.


          --
          Art Benstein near Baltimore

          The second mouse gets the cheese.







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