Question about 1991 Volvo 240

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91 240 weather sensative

This silly car has 200k + miles, looks great and runs great but only in cold weather... for some strange reason it will not run durring hot weather temperatures. everything checks out, great compression, timing, fuel supply. can anyone help?

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This is a typical problem that happens with the preheat system. in the air filter box, there is a small, thermostatic switch, brass in color, which pushes on a pedal. the pedal moves around to either cover the preheat in take or the cold air intake openings in the air box. this switch has a nasty tendency to seize in the "full preheat" position. ipdusa.com sells them for around $5 a pop.

Posted on Oct 30, 2009

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Depending on the year I would suspect ect sensor for the ecm. car needs to know how cool or hot the coolant is in order to calculate fuel mixture properly...

Posted on Nov 20, 2008

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CHECK YOUR OXYGEN SENSOR AND YOUR EXHAUST MANIFOLD COULD BE WARPED AS WELL WHICH CREATES CONFUSION WITH YOUR FUEL INJECTION. YEARS AGO, I HAD/WASTED A LOT OF TIME/MONEY. A RECALL OF THE ELECTRICAL HARNESS (THIN COVERING) CURED THE HOT WEATHER SICKNESS, BUT I DID HAVE BLOW BY FROM THE
MANIFOLD WHICH VOLVO REGIONAL MANAGER COVERED AS WELL. IT TOOK A LONG TIME
FOR THE RIGHT V PERSON TO ACKNOWLEDGE THE HARNESS RECALL

Posted on Nov 12, 2008

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