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#1
05-31-2005, 02:08 PM
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Weird Tach Behaviour
Now the warmer weather is here and I have been using the A/C I have noticed that my Tachometer reads low when the A/C is on. It is stable and moves with engine speed, but it is reading very low. It shows 2000rpm at 75mph where normally it should be close to 3000rpm.
 I haven't seen it flicker when the compressor switches in and out but when I floored it into kickdown (which I believe does disengage the compressor) the tach jumped back to normal until I backed off. Any ideas anybody 
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1991 M-B 560SEL Arctic White/Grey 99,000 Miles 1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten) 2006 Volvo XC70 Blue/Beige 1999 Porsche Boxster Arena Red/Savanna Beige 1986 Porsche 928S Goldweiss/Brown 
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