Question about 1994 Land Rover Discovery

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When I first start my 94 disco it idles fine but when it warms up the idle goes high then low high then low. Its up and down. What could be the cause? I changed the plugs and wires and cap but it still does it. The smog ref won't pass it because it does that.

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  • 54 Answers

It sounds like a idle air sensor they can be very expensive and if you are taking one off yourself you will need a torx specialty tool with a security indentation.

Posted on May 27, 2010

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sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know

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