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Car Forum / Saturn Cars / December 2006Mystery-solution?
I had been having a problem with high idle in summer heat when running the AC and especially a drop in gas mileage of about 5-6 mpg....heavy soot deposit around the outlet of exhaust pipe...rich mixture. I changed the plugs, cleaned sensors etc....all the things that were suggested by the group, but did not seem to help. Last week my wife mentioned that she heard a squeel coming off the engine when turning the wheel, so I checked the belt. It was cracked and hard, probably had 90-100k miles on it, so I bought one of the new style Dayco belts and installed it. Now the mileage is back to what it was before and the idle is much better also. Anyone know why a slipping belt would cause these problems? TIA, MR Your symptoms sound a lot like a bad coolant temperature sensor to me since it would tell the engine computer the engine was always cold sending it more fuel and running rich. A slipping belt would not cause the symptoms you were seeing. It's good you replaced the bad belt, but I'd be suspicious and be on the look out for them to return. Bob >I had been having a problem with high idle in summer heat when running the >AC and especially a drop in gas mileage of about 5-6 mpg....heavy soot [quoted text clipped - 9 lines] > TIA, > MR Is the sensor the same as the one for the temp indicator on dash? If so, it seems to be showing the correct temp. Also, is the temp sensor easy to replace. Thanks, MR > Your symptoms sound a lot like a bad coolant temperature sensor to me > since [quoted text clipped - 26 lines] >> TIA, >> MR  SignatureUsing Opera's revolutionary e-mail client: http://www.opera.com/mail/ What year and type vehicle? Earlier models used two sensors so the driver temp gauge could still read correctly while the one reporting the coolant temp to the computer could be broken. Bob > Is the sensor the same as the one for the temp indicator on dash? If so, > it seems to be showing the correct temp. Also, is the temp sensor easy to [quoted text clipped - 32 lines] >>> TIA, >>> MR 97 SL1, Thanks again, MR > What year and type vehicle? Earlier models used two sensors so the > driver [quoted text clipped - 51 lines] >> -- >> Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ SignatureUsing Opera's revolutionary e-mail client: http://www.opera.com/mail/ That model had just one sensor. > 97 SL1, > Thanks again, [quoted text clipped - 55 lines] >>> -- >>> Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ |
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