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91 245 Check engine light 200 1991

posted by  someone claiming to be Epic2112 on  Sat Oct 22 00:18 CST 2011 [RELATED]

I am the proud new owner of a $700 245 with many little issues. One is that the check engine light is on. I checked the fuel system fault codes and got three:
-Fuel injector circuit fault
-Lean or rich condition during cruise
-Extremely lean or rich condition during cruise

The car itself seems to be running fine, any ideas what the issue might be?

Thanks for the help!








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    91 245 Check engine light 200 1991

    posted by  pageda on  Sat Oct 22 04:02 CST 2011
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    last visit: Fri Oct 24 13:18 CST 2014
    [RELATED]

    Clear them by removing the 25 amp fuse near the battery and see if they return.
    Dan








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      91 245 Check engine light 200 1991

      posted by  pageda on  Sat Oct 22 06:13 CST 2011
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      last visit: Fri Oct 24 13:18 CST 2014
      [RELATED]

      Make that fuse 6 in the fuse box, the 91 was the first year without the 25 amp fuse.
      Thanks Art
      Dan







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        91 245 Check engine light 200 1991

        posted by  someone claiming to be Epic2112 on  Sat Oct 22 09:14 CST 2011 [RELATED]

        Thanks, I'll try that and see if anything persists. Any reason why it's better to clear them that way than my using the little button on the code reader dohicky? Just faster?








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          91 245 Check engine light 200 1991

          posted by  TONY H on  Sun Oct 23 06:09 CST 2011
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          last visit: Fri Oct 17 16:39 CST 2014
          [RELATED]

          The reason I pull the fuse is because no matter how slow and diligent I am at doing the Code Clearing procedure, It never works.

          Lean running conditions might be caused by Intake manifold leaks.
          Check for cracks in the Larger Bellows to the Throttle body, check the small vacuum line tat runs from Fuel Pressure regulator (on the Fuel rail) down to the Intake manifold.
          Does teh car Idle very well or does it stumble?


          --
          '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.lyse.net/brox/TonyPage4.html http://cleanflametrap.com/tony/








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            91 245 Check engine light 200 1991

            posted by  someone claiming to be Epic2112 on  Sun Oct 23 10:03 CST 2011 [RELATED]

            It idles fine in neutral, but when it's cold the idle gets real low when I put it into reverse or drive while I'm holding the brake. This clears up quite quickly as the car warms up. This is my first automatic 240, the rest are all stick, so I'm not quite sure what normal is like when you put the car into gear, but I'm pretty sure it isn't this.








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          91 245 Check engine light 200 1991

          uid 27's pic
          posted by  Art Benstein on  Sat Oct 22 09:46 CST 2011
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          last visit: Fri Oct 17 20:10 CST 2014
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          The way I understand it, is the button sequence clears the codes but does not reset any learned mapping changes (fuel trim in the case of the fuel ECU) where a fuse pull instantly clears all limp-home and long-term adaptive trim. I wish I knew for damned certain, but it has been my habit to pull the fuse and give the system 10 miles to come up with any new complaints. And it is easier.
          --
          Art Benstein near Baltimore

          Why is the man who invests all your money called a broker?








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            91 245 Check engine light 200 1991

            posted by  pageda on  Sat Oct 22 11:08 CST 2011
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            last visit: Fri Oct 24 13:18 CST 2014
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            My experience is the procedure described to clear codes does not reliably do that.

            And as Art says it is a good idea to clear the adaptive memory that may not be good for current conditions.

            Dan








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              91 245 Check engine light 200 1991

              posted by  someone claiming to be Epic2112 on  Sat Oct 22 18:08 CST 2011 [RELATED]

              Great, thanks guys! I'm going to give that a shot and cross my fingers. The previous owner said his mechanic suspected the idle stabilizer valve. I had a known good one, so I've swapped it in. I'm going to pull that fuse, and once I get to the DMV to register the car, which will be a few days :(, I'll rack up those ten miles or so and see how everything is.

              Thanks again!








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                91 245 Check engine light 200 1991

                posted by  pageda on  Sat Oct 22 19:28 CST 2011
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                last visit: Fri Oct 24 13:18 CST 2014
                [RELATED]

                Yes that would be the Idle air control valve (IAC), make sure that and the throttle body are nice and clean.
                Dan








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                  91 245 Check engine light 200 1991

                  posted by  someone claiming to be Epic2112 on  Sun Oct 23 12:18 CST 2011 [RELATED]

                  Well, I pulled fuse 6, and now the car won't even run. Clearly the temporary mapping was doing a ton. I need to hold the gas down to keep the engine from dying. It backfires a bit through the intake.

                  While I was in there I also cleaned the grounds on the fuel rail, and I cleaned the AMM. Any ideas? What to look for next?








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                    Update: Got it! 91 245 Check engine light 200 1991

                    posted by  someone claiming to be Epic2112 on  Sun Oct 23 13:07 CST 2011 [RELATED]

                    Found it! The AMM bench tested fine, but for the hell of it I plugged in a spare I had on the shelf. The car started right up and runs better than before clearing the codes!

                    Thanks for the help everyone!








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                      Update: Got it! 91 245 Check engine light 200 1991

                      posted by  pageda on  Sun Oct 23 13:59 CST 2011
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                      last visit: Fri Oct 24 13:18 CST 2014
                      [RELATED]

                      You discovered the only reliable way to test for a bad AMM. Now get another one incase it happens again.
                      Dan








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                        Update: Got it! 91 245 Check engine light 200 1991

                        posted by  someone claiming to be Epic2112 on  Sun Oct 23 23:20 CST 2011 [RELATED]

                        Good idea. Any suggestions on the best place to buy one? Or to have my bad one rebuilt?








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                          Update: Got it! 91 245 Check engine light 200 1991

                          posted by  pageda on  Mon Oct 24 14:44 CST 2011
                          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
                          last visit: Fri Oct 24 13:18 CST 2014
                          [RELATED]

                          The junk yard or eBay, look for one that is guaranteed to work and test it out when you get it.

                          Tony H has some good advise about the airbox thermostat, the best way to fix it is to block the hot air from the exhaust manifold or if you have no visual inspections remove the tube and plug the inlet to the airbox.
                          Dan








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                            Update: Got it! 91 245 Check engine light 200 1991

                            posted by  someone claiming to be Epic2112 on  Mon Oct 24 21:10 CST 2011 [RELATED]

                            Yep, I'm gonna open up the airbox and block it off so that the air has to come in from outside.








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                          Update: Got it! 91 245 Check engine light 200 1991

                          posted by  TONY H on  Mon Oct 24 06:39 CST 2011
                          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
                          last visit: Fri Oct 17 16:39 CST 2014
                          [RELATED]

                          Check teh Thermostat in your Air Cleaner. It is probably broken in the 'open' position. This means that very hot air is allowed to pass through the AMM.
                          That's not good. Many of us close off the Hot air inlet.
                          --
                          '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.lyse.net/brox/TonyPage4.html http://cleanflametrap.com/tony/







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