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fault code 42 - idle switch?

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Old Jan 7, 2007 | 02:27 PM
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Default fault code 42 - idle switch?

what does this mean and will it have knocked my ecu back?
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Old Jan 7, 2007 | 03:20 PM
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at a guess idle control valve on top of inlet manifold dose as the name sugests, may just need cleaning
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Old Jan 7, 2007 | 03:26 PM
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Hi mate hold on it could be either Idle Switch or Circuit.. Get good advice
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Old Jan 7, 2007 | 04:33 PM
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would this b likely to roll ecu back? recently had sum mapping work done and was running 16psi of boost, jsut had it on rr yesterday with 4 of my m8s cars and only ran 13.5psi of boost, was smoky, sent the co volumes off the scale and operater said car felt very unhappy, also over 5 runs made bhp figures ranging from 240 to 296, something is a miss!
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Old Jan 7, 2007 | 05:02 PM
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i would get it set up properly and i would lower the boost are you using power commander if not i would advise it
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Old Jan 7, 2007 | 05:13 PM
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had the mapping done by scoobyclinic so everything should of been set up correctly BUT???
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Old Jan 7, 2007 | 05:18 PM
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Doesnt sound it if you have lost boost have you got an air leak...
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Old Jan 7, 2007 | 05:47 PM
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not as far as i am aware, what would be best way 2 check 4 1?

or would a dirty air filter have similar effect?

Last edited by no1nutter; Jan 7, 2007 at 05:53 PM.
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Old Jan 7, 2007 | 06:28 PM
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well you would loss boost if you had an air leak and you could hear air leaking like a punctured tyre if you get me you might have a faulty boost valve..
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