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idle, speedometer and odometer issues 900 1994

posted by  U.S. Diver on  Wed Oct 2 10:51 CST 2024
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1994 Volvo 940, Bosch. 257,000 miles.

Recently my car has developed a high idle--1400 rpm. It hangs there after a drive.

Simultaneously, the speedometer has stopped working. Weirdly, the odometer is putting on 10x the miles actually driven.

My mechanic, an experienced Volvo tech, is trying to work through the issues. He had replaced the idle air control valve, which (he says) has addressed the idle issue.

He is planning to see if the voltage regulator (an original part) is defective, and putting out too much voltage, thereby affecting the speedometer. If not, he is planning to have the speedometer rebuilt. He is not certain he is going to be able to solve these issues.

I have trouble believing that these issues are not somehow related.

My questions are: 1. Anybody have any insight into these issues occurring simultaneously? and 2., If he cannot solve these issues, anybody know any good Volvo shops in the greater Los Angeles area who perhaps can?

Thanks!





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