Quote:
Originally Posted by RH77
One addition question -- do you know why the FE would drop so much? Does it "freak-out" into open-loop or cool the charge by running rich?
RH77
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A few reasons. One, if you look at the picture in the previous post the hot air side intake (on the right) is about 1/4 the size of the cold air side. The engine was breathing through a straw. Secondly the AMM reads maximum air temp so the ECU does everything in its power to protect the engine from detonation. It retards timing and enriches the fuel mixture. The engine management was smart enough to hide the symptoms from the driver so the car still ran fine. It just had poor fuel economy and reduced peak power. Most owners think this is normal because 'obviously' all volvos are heavy, thirsty and slow. A good 240 5 speed only weighs 2900lb and can touch 30mpg on the highway.
While volvo produced the same body style for 18 years (240) and same red block engine for 24 years, the engine management was always on the cutting edge. Volvo was the first manufacturer to use an O2 sensor and catalytic converter in 1974 and knock sensor in the early 80s. The same red block engine in the US went from CIS mechanical injection in the 70s to Bosch LH 1, 2, 2.2, 2.4, 3.1 and finally motronic.
http://www.swedespeed.com/news/publi...ticle_800.html
Today volvo is just another ford brand. Its best days are behind it.