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For the past week the evening temps where I live have been below or near freezing. Very rare for this part of CA. Aside from broken water pipes and lots of plants and flowers dying, I was surprised that my car was struggling to warm up. After a quick start, the first 20 seconds or so were normal, but then the engine would begin to sputter and bog down. If I pressed the gas pedal, it would rev, but one or more of the cylinders would misfire badly. After a few minutes of that, it would finally settle down and idle normally. Trying to diagnose and solve the problem, my first thought was there wasn't enough fuel. So one cold morning I started the engine and turned the air/fuel mix screw inside the fuel distributor to enrichen the mix. That only made things worse, so I backed it off and kept backing it off (almost 360 degrees around) until it idled normally. But then when the engine warmed up after 5 minutes, the idle RPM dipped below 500 and struggled to keep running unless I did one of two things - open up the idle screw, or return the air/fuel setting to where it was. Not long before all this I had a smog test done and it passed pretty much down the middle, so I knew the air fuel mix was proper. I couldn't figure out why the fuel was so rich that it was bogging the engine down during warm-up. I thought maybe the fuel line pressure regulator was faulty and messing with the control pressure. The existing one looked normal when I removed it, but I replaced it anyway. I decided to also swap out the warm-up regulator. Then I started the car and it warmed up perfectly. However, the temps were in the high 50's by then, so that's not exactly a proper test. I'll know for certain tomorrow morning. My guess is that it was the wu regulator. What exactly I don't know. Perhaps the temperature sensitive internal piston that moves with the expanding metal locked up somehow. Perhaps from corrosion. I'll take it apart and look inside.
posted by 72.67....
, Sat, 20 Jan 2007 03:48:03, Sun, 21 Jan 2007 15:14:56
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