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post #53 of (permalink) Old 27th September 2008
Technical Supremo

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Quite a number of the so-called plug-in chips are actually only a resistor that fools the ECU into thinking the engine is cooler than it actually is and increases the amount of fuel injected into the engine. As they don't seem to increase the amount of air proportionally the engine only runs that bit richer. It might improve acceleration but it is also likely to increase fuel consumption with poorer mpg. When fitted to some of the renault engines it can cause a fuel fault problem to be logged - yeh the dreaded warning light comes up. You also have to remember the Lamda sensor may counteract any beneficial effect if it detects the exhaust gases are incorrect.
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