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245 correct idle after start but high after use 200 1992

posted by Art Benstein on Sat Oct 3 10:02 CST 2020
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last visit: Fri Oct 17 20:10 CST 2014

[RELATED]

Oh, I remember the polar part of your login name despite my general ignorance of the European market for Volvos. Seems I read somewhere that 2000cc was a taxing cutoff for engine displacement having a large impact.

Yes, the LH2.4 ECU does an instant reset of learned trim when the power is removed but to characterize the difference between the baseline and the trim learned depends on the individual car. For example, the trim adjustment makes up for intake leaks, throttle plate wear, cylinder wear, long term fuel pressure changes, and compression changes due to soot buildup. The combination would be different individually. I've noticed in one example, after a reset, the engine stalled before I got out of the driveway.

Idle speed shouldn't vary at all, I think, given a properly operating TPS (here in the States you'd probably have LH3.1 with an M47 in '92), a correctly adjusted throttle plate stop, a clean idle air valve, and of course, the VSS present. And there's nothing I know about the trim adjustment the ECU makes after a reset that would purposely set the idle higher.

I could guess that a throttle plate stop adjustment problem could lead to enough extra air that the idle valve's correction ability would be out of range, and that could show up after the motor was warm. Turning the key off and restarting would not change that condition, like it does with a missing VSS. And you've already discounted any dependence on warm up or temperature.

If I read your post carefully, especially the part about the signal to your new IAC being different during the malfunction, I'd be inclined to suggest you try to find another fuel ECU to try. You seem to have done your homework. Curious about this; which one is it? I'm only familiar with -933, -951, -561 versions of LH2.4. Maybe one designed for the B200F has a different way to deal with changes to idle speed. Assuming the signal change you see toward the IAC is increased duty cycle, by how much?

--
Art Benstein near Baltimore

"Politics is the systematic organization of hatreds." -Henry Adams

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245 correct idle after start but high after use [200][1992]
posted by Grey245 on Sat Oct 3 02:51 CST 2020 >

245 correct idle after start but high after use [200][1992]
posted by OwenF on Sat Oct 3 04:11 CST 2020 > V
- 245 correct idle after start but high after use [200][1992]
  posted by Art Benstein subscriber on Sat Oct 3 05:08 CST 2020 > V
  - 245 correct idle after start but high after use [200][1992]
    posted by Grey245 on Sat Oct 3 08:27 CST 2020 > V
    - 245 correct idle after start but high after use [200][1992]
      posted by Art Benstein subscriber on Sat Oct 3 10:02 CST 2020 > V
      - 245 correct idle after start but high after use [200][1992]
        posted by Grey245 on Sat Oct 3 11:23 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Dave Stevens on Sat Oct 3 14:00 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Grey245 on Sun Oct 4 11:22 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Art Benstein subscriber on Sat Oct 10 19:32 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Grey245 on Sun Oct 11 01:13 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Art Benstein subscriber on Sun Oct 11 05:13 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by pageda on Sun Oct 11 06:27 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Grey245 on Sun Oct 11 11:31 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Dave Stevens on Sun Oct 11 11:45 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Grey245 on Sun Oct 11 13:52 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by pageda on Sun Oct 11 14:34 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Grey245 on Thu Oct 15 11:28 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Amarin on Thu Oct 15 14:06 CST 2020 > V
        
        245 correct idle after start but high after use [200][1992]
        posted by Grey245 on Fri Oct 16 02:10 CST 2020 > V
        
        Problem SOLVED! [200][1992]
        posted by Grey245 on Fri Oct 16 08:03 CST 2020 > V
        
        Problem SOLVED! [200][1992]
        posted by Amarin on Fri Oct 16 10:49 CST 2020 > V
        
        Problem SOLVED! [200][1992]
        posted by Grey245 on Fri Oct 16 11:06 CST 2020 > V
        
        Problem SOLVED! [200][1992]
        posted by Dave Stevens on Sat Oct 17 01:03 CST 2020 > V
        
        Problem SOLVED! Or maybe not? [200][1992]
        posted by Grey245 on Sat Oct 17 07:47 CST 2020 > V
        
        ECU connector pin 34 [200][1992]
        posted by Art Benstein subscriber on Sat Oct 17 09:36 CST 2020 > V
        
        ECU connector pin 34 [200][1992]
        posted by Grey245 on Sat Oct 17 10:38 CST 2020 > V
        
        Maybe ECU connector pin 14 [200][1992]
        posted by Grey245 on Sun Oct 18 04:17 CST 2020 > V
        
        Maybe ECU connector pin 14 [200][1992]
        posted by Art Benstein subscriber on Sun Oct 18 09:23 CST 2020 > V
        
        Maybe ECU connector pin 14 [200][1992]
        posted by Grey245 on Sun Oct 18 12:56 CST 2020 > V
        
        Maybe ECU connector pin 14 [200][1992]
        posted by Dave Stevens on Sun Oct 18 19:51 CST 2020 > V
        
        Maybe ECU connector pin 14 [200][1992]
        posted by Grey245 on Sun Oct 18 22:10 CST 2020 > V
        
        Maybe ECU connector pin 14 [200][1992]
        posted by Dave Stevens on Mon Oct 19 00:03 CST 2020 > V
        
        Unlikely ECU connector pin 14 15 [200][1992]
        posted by Amarin on Mon Oct 19 09:09 CST 2020 > V
        
        Not pin 14, but maybe 30 [200][1992]
        posted by Art Benstein subscriber on Mon Oct 19 04:57 CST 2020 > V
        
        Not pin 14, but maybe 30 [200][1992]
        posted by Grey245 on Mon Oct 19 12:13 CST 2020 > V
        
        Not pin 14, but maybe 30 [200][1992]
        posted by Art Benstein subscriber on Mon Oct 19 13:27 CST 2020 > V
        
        Not pin 14, but maybe 30 [200][1992]
        posted by Grey245 on Tue Oct 20 13:15 CST 2020 > V
        
        Not pin 14, but maybe 30 [200][1992]
        posted by machine man subscriber on Tue Oct 20 21:06 CST 2020 > V
        
        Not pin 14, but maybe 30 [200][1992]
        posted by Art Benstein subscriber on Wed Oct 21 08:57 CST 2020 > V
        
        Not pin 30 either [200][1992]
        posted by Grey245 on Wed Oct 21 22:12 CST 2020 > V
        
        Not pin 30 either [200][1992]
        posted by Art Benstein subscriber on Fri Oct 30 12:21 CST 2020 > V
        
        Not pin 30 either [200][1992]
        posted by Grey245 on Sat Oct 31 01:15 CST 2020 > V
        
        Not pin 30 either [200][1992]
        posted by Dave Stevens on Sat Oct 31 14:42 CST 2020 > V
        
        Not pin 30 either [200][1992]
        posted by Grey245 on Sun Nov 1 02:30 CST 2020 > V
        
        Not pin 30 either [200][1992]
        posted by Grey245 on Mon Nov 2 02:25 CST 2020 > V
        
        Not pin 30 either [200][1992]
        posted by Amarin on Mon Nov 2 03:14 CST 2020 > V
        
        False air [200][1992]
        posted by Art Benstein subscriber on Mon Nov 2 09:22 CST 2020 > V
        
        False air [200][1992]
        posted by Grey245 on Mon Nov 2 11:55 CST 2020 > V
        
        False air [200][1992]
        posted by Amarin on Mon Nov 2 13:49 CST 2020 > V
        
        False air [200][1992]
        posted by Art Benstein subscriber on Mon Nov 2 15:22 CST 2020 > V
        
        False air [200][1992]
        posted by Grey245 on Sun Nov 8 11:23 CST 2020 > V
        
        False air [200][1992]
        posted by Nahtanha on Mon Nov 2 17:14 CST 2020 > V
        
        EZK connector pin 4 [200][1992]
        posted by Grey245 on Fri Oct 30 09:56 CST 2020 > V
        
        B200F ECU list [200][1992]
        posted by Amarin on Mon Oct 12 06:28 CST 2020 > V
        
        B200F ECU list [200][1992]
        posted by Grey245 on Mon Oct 12 11:58 CST 2020 > V
        
        B200F ECU list [200][1992]
        posted by Grey245 on Fri Oct 16 11:00 CST 2020 > V
        
        B200F ECU list [200][1992]
        posted by Amarin on Fri Oct 16 13:22 CST 2020 > V
        
        B200F ECU list [200][1992]
        posted by Grey245 on Sat Oct 17 00:50 CST 2020 > V
        
        FFF [200][1992]
        posted by Art Benstein subscriber on Sat Oct 17 05:29 CST 2020 > V

245 correct idle after start but high after use [200][1992]
posted by Grey245 on Tue Dec 8 15:28 CST 2020 > V

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245 correct idle after start but high after use 200 1992