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760 Idles higher when hot? 700

posted by  ttoth on  Sun Sep 26 14:58 CST 2004
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last visit: Tue Oct 18 12:11 CST 2011
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1990 760 Turbo. Cleaned throttle body out, and took intake out and cleaned well. OF course car idled faster, so I set the idle to just over 700( I did this the cheap way by bending the stop..).

Problem: On startup car will idle @ 700. if I run it for a while (20min or so).. it then idles at 1150.. (in drive or in park) If I turn car off.. then back on.. it goes back to 700. I've gone thru some FAQ's and it addresses how to set the FI and stuff.. but doesn't address why my idle would be fine on startup then turn up after a while?

Oh, another note, I just added a new used AC compressor in the car.. I have not yet filled it or hooked up the safty switch. So I'm sure the computer doesn't see the ac on, and adjusted the idle accordingly..

tom
--
90 Volvo 760 Turbo, 86 Mercedes 300E,87 Maserati Biturbo,95 Hummer XLC








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    760 Idles higher when hot? 700

    posted by  belleau on  Tue Sep 28 06:06 CST 2004
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    I have that problem on my 1989 740. I found that coming from a worse contact between the rpm sensor and the computer. So if read your ecu code you surely have "no rpm sensor". Take the ecu code on your car and check in the fact for the reading of the blimp.
    --
    (740 gl 89 (421 k km), 760 gle 88 (200 k km)) notice, don't get mad with my grammar i'm a french speaking native...







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