#16: Re: What are these and do they work?..... Author: MrrNoName, Location: UKPosted: Wed Nov 02, 2011 5:04 am ----
jordey-hdi wrote:
if i remember correctly they tell the ecu that the engine is running cold therefore injecting more fuel to warm it up
Correct,
All they do is make the ECU think that the temperature sensor is reading a much colder value then it actually is, a colder engine uses more fuel when its idleing. Therefore the ECU is over-fueling the engine when it has warmed up.
It increases fuel usage, increases emissions, generally messes the engine's tuning up and provides no gains.
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