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Base idle on LH 2.4 700

posted by  someone claiming to be Volvouser on  Tue Jun 21 07:21 CST 2005 [RELATED]

Today, I helped my neighbor with his -89 B230F with LH 2.4. It was suffering from a "starting, then dying" problem (idled perfectly at 750 rpm, though). At first I cleaned the throttle body. Needless to say, I was very dirty. It led to an improvement but unfortunately, it was far from perfect. Therefore, I decided to make a base idle adjustment.

According to Haynes, base idle is adjusted in "limp home" mode, which could be forced into by pulling the connector to the AMM. I tried that, but it still idled at around 750 rpm.

Therefore, I tried to remove the connector to the IAC which resulted in an extremely low idle, ~300 rpm. After noticing that, I adjusted the base idle screw until it idled at a steady 500 rpm (as suggested). After reconnecting the IAC and adjusting the throttle position switch, it started easier than ever and my neighbor was happy!

Now to my question: Did I set the base idle correctly? If not, could there be any problems?






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