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What causes idling rpm to go from 700 to 1500 and back again and again on a 1991 Jaguar XJS V12 Convertible?
Wiki User
∙ 15y ago
Hi, I run a '93 4.0 litre xjs, so far no problems in this respect. However my '94 2.0 litre mondeo (78,000) family owned car had this problem, automatic as well. I replaced the air sensor unit/air flow unit, with genuine replacement and this cured the problem . For years whilst my father ran the car the engine would be idling like this. When the car was handed over I couldn't stand it and worked through a haynes manual quickly finding the fault. It was a big relielf and the Ford part was 72 pounds. I hope this gives you some help. Regards Andrew.
Wiki User
∙ 15y ago
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