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The mkiv Supra Owners Club

MISSFIRING AND OVER FUELLING?


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My car runs perfectly then after a short run, say 10 miles it starts to misfire and run mega rich, lots of petrol white plume from the exhaust? The car has an NAT fitted by "Rocketdog" Racing in 2016,they fitted a Toyota 4 Runner distributer cap and rotar kit. Am i right in thinking that the HT coil (see photo), 298643394_HT_COIL..thumb.jpg.26f7c95d86fee35ec8039fcdf6683ed5.jpg on the offside wing to feed the centre of the distributer cap is the coil?  I ask this as the car is 24 years old and 42K miles may be the culprit. ? The other possibility was the MAP sensor but this has been tested and is OK.

 

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