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Throttle position switch compatibility 200

posted by  Jorrell on  Wed Jan 11 13:32 CST 2006
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last visit: Thu Dec 27 03:00 CST 2012
[RELATED]

Are the throttle position switch assemblies from 1989 (LH2.4) through 1992 (LH3.1) interchangeable? Trying to start up a fresh engine (LH3.1) and it is running so fat it floods unless the gas pedal is on the floor. The ECU check code returned a 4-1-1 (throttle position switch problem). No other codes are thrown.

Thoughts?

Thanks,
jorrell








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    Throttle position switch compatibility 200

    posted by  Michae1 on  Wed Jan 11 19:17 CST 2006
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    last visit: Sun Feb 28 08:41 CST 2010
    [RELATED]

    LH3.1 uses the same TPS as the 850. The LH3.1 throttle body is different too, and you can't just bolt up the LH3.1/850 style TPS to the earlier TB.

    Assume you know if you have LH3.1 or not, but the easy way to tell is that the AMM uses a 4-wire plug, rather than the wider 6-wire plug of LH2.2/LH2.4. And the LH3.1 ECU is most likely a 572 (non-EGR). I have one of these cars.

    --
    forums.turbobricks.com








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      Throttle position switch compatibility 200

      posted by  Jorrell on  Thu Jan 12 11:47 CST 2006
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      last visit: Thu Dec 27 03:00 CST 2012
      [RELATED]

      Thanks for the input folks. When I put this engine back together, I used the throttle body and TPS off of an LH2.4 B230F since I had already cleaned it and mirror polished it. This car is truly an LH3.1 and originally had an M47 trans, I have converted it to an AW-70 auto... now its a real oddity in that Volvo never made a 92 with LH3.1 and an auto trans.

      Could I interest anyone in a polished (on the outside) LH2.4 compatible throttle body? Live and learn!

      Thanks!
      jorrell







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    Throttle position switch compatibility 200

    posted by  jdsullivan on  Wed Jan 11 16:24 CST 2006
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    last visit: Fri Jun 22 13:20 CST 2012
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    The LH 3.1 TPS is more than a switch--it has a built-in potentiometer (see pages 241-19 and 241-20 in Bentley). So it is very possible that having a 2.2 or 2.4 TPS in there is indeed causing the problem. But are you sure it's a 3.1? They are not common most places.
    --
    jds








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    Throttle position switch compatibility 200

    posted by  interstition on  Wed Jan 11 13:38 CST 2006
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    last visit: Mon Apr 28 10:13 CST 2014
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    For parts compatibility, the first place I go is to fcpgroton.com to see if they sell the same part number for both vehicles. You may be able to determine your answer there or at another online site.

    Having said that, I don't think your TPS is all of your problem and maybe not any of it. The TPS is just an on-off switch and when I have misadjusted the switch (and the time I accidentally left it unplugged), my engine "idled" much faster, maybe 1500 RPM, but not wildly fast and it didn't keep the car from running in any case.
    --
    Andy in St. Paul. '89 244 153K mi, '91 745 Regina 206K, '88 244 184K







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