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240 temperature sensors, Bentley book error? 200 1989

posted by  jbeltz76 on  Fri Jul 3 12:38 CST 2009
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last visit: Sun Feb 6 14:40 CST 2011
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Art,

Thanks for your help. The problem that I'm having, which led me to looking through the book and the archives in the first place, is that the car will start and run fine, for about 5 seconds. After that, it will either stall, or surge badly trying to maintain a constant idle speed, after which it's likely to stall anyway, unless it is fed more gas. By feeding more gas it can stay running long enough to shift gears and get out of the parking lot. After about a minute or so, the problem goes away and it idles fine. But, if I shut the car off and restart it, with or without waiting for the engine to cool down, it'll go through the same sequence when restarted. It's been like this for at least 6 months now. When the problem started it also seemed to miss a few beats at higher RPMs and lack acceleration, though that hasn't been as noticeable lately. The new plugs, wires, rotor and cap may have cured that.

But I've been through most of the rest of section 241 of the Bentley book and haven't found the real culprit yet. I have yet to test the temp sensor, as I just now got the intake manifold removed. I also missed the O2 sensor test. The ECU tests turned out good, except for the RPM signal which was only 5 volts instead of 12. The throttle body area looks relatively clean, and the two small orfices on the top side of it are not plugged up, I can see light through them. The throttle switch checks out good, as does the idle speed motor.

Thanks,
Johnathan






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