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Coolant temp sensor access 200 1984

posted by  cguin on  Tue Apr 12 05:05 CST 2005
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last visit: Sat Jul 24 10:57 CST 2010
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Hello Board,

Car is an '84 245ti. Yesterday my wife complained that upon startup the idle rpm went to ~2500 and stuck there.

When she started driving around town, idle returned to normal.

I searched the Board yesterday and one (seemingly easy to check) possibility seems to be that the connection at the coolant temp sensor needs to be cleaned and/or the sensor needs to be replaced.

So the two questions are:

1) Do I need to pull the intake manifold to access the sensor/connection?

2) Any adivce as to other likely causes for high idle rpm?

Thanks,
Corey








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    Coolant temp sensor access 200 1984

    posted by  Greg N on  Tue Apr 26 17:14 CST 2005
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    My advice would apply to a slightly newer 240 (LH 2.2), unfortunately I have not owned one of your year. In my experience the IAC mentioned previously could cause the problem you experience. It is a round cylinder underneath the intake with an electrical plug in and two hoses attached to the end. I would check this first. The 700/900 FAQ has more good info on this.

    The coolant temp sensor can be removed w/o removing the intake if you have patience and small hands. You will have to remove the throttle body however. You will probably want to take a look at the flame trap on top of the oil seperator box while you are under there.

    Greg








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    Coolant temp sensor access 200 1984

    posted by  mackinta on  Tue Apr 12 13:19 CST 2005
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    last visit: Tue Jul 3 01:33 CST 2007
    [RELATED]

    Corey, you may want to check your auxilary air valve, which is a small cylinder with two beefy black rubber hoses attached located under the manifold. If it gets stuck open your car will idle very high - 2500 sounds about right as the car warms up. If after warm-up the car returns to normal, it may have gotten stuck in the open position and you should pull it out and run carb clean through the in and out ports. I had a ton of trouble trying to get my 242 turbo's idle under control and it turned out to be simply dirty connections to the air valve. You should also clean out the throttle body and make sure nothing there is binding or gummed up. Let me know what happens, I may have more suggestions with the time I just spent with this issue. Andrew







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