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Old 07-17-2000, 03:42 PM
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I have a 300SDL and I think I have a bad relay , but not sure. Any easy way to test myself or is it a lost cause? Car sympton: when car is idling I experience an intermittent RPM spike then drop-off ,then car smooths out and runs fine. I have noticed the problem both at idle when engine is cold , and upon re-start with warm engine. I have gone thru archives but did not find any trouble shooting suggestions.

Johnny Justice
1986 300SDL 171K
1996 Ford Explorer 62K
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Old 07-17-2000, 09:42 PM
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Testing is possible but as in your case with a intermittent problem it can be difficult and time consuming. If you are going to test you will need a ETM and a good multi-meter with a recording function at min. A recording occiliscope would be better.
Also it would be much easier if you had the breakout boxes that allow testing of circuits without backprobing the connectors.
Good Luck
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Old 07-19-2000, 09:31 AM
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Thanks for the input. I think I will have the relay tested at a local shop. My electrical expertise is not up to the level I feel comfortable to properly troubleshoot. I am not real sure the shop will either, since the problem is intermittent and of short duration[1-2 seconds].
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