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Cold Start Enrichment Injector - when fitted, injector is mounted at the top of the throttle body.
 

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The 5th injector(cold start enrichment) acts like a carburettor choke car would, the N/a 8v had them and the 16v have them too but the LPT and FPT don't as the ecu gives 2 injections of fuel per revolution on start up, which equates as the choke(or 5th injector) to help start/warm up
 
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