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post #2 of (permalink) Old 24th August 2007
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Smile Erratic Speedo

had this problem myself took a long time but found the fault to be a broken earth cable on the engine block just below the main earth braid from battery by the dipstick tube the first thing to do is disconnect your battery the earth cables are the the main earths to the ECU . the cables come from the wiring loom and there are 2 cables connected to 1 large eyelet, found 1 broken and the other nearly through removed 13mm bolt crimped 2 new eyelets refitted to engine block tested all ok reconnect battery test drive speedo steady as a rock ...... I think this problem can account for a lot of engine / electronic incident problems that occur just another problem area to check out when odd things start happening to the car... hope this helps
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