AaronM Posted February 8, 2005 Report Share Posted February 8, 2005 Just picked up the STS! I always got really bad gas mileage (10-12mpg). The exhaust also smelled like rotten eggs. One of my friend's parents own it. It ended up being the air and coolant sensors. My coolant sensor was off by 45 degrees and my air sensor was off by 73 degrees. Cost: $134.37 Labor $74.37 parts tax....TOTAL: $213.20 When I drove out of the lot, the car felt week. It didn't have the same punch as it did before. Then, I noticed my seat wasn't adjusted right. Next red light came up and I gave it some, haha. Woo! The punch is still there! I ended up getting 19.7 MPG and it was city driving! I then smelled the exhaust and there was no smell at all. YAY! My car is fixed! 18 Year Old Male Black 1992 STS 4.9L 90,XXX Miles Flowmaster 80 series muffler Link to comment Share on other sites More sharing options...
adallak Posted February 8, 2005 Report Share Posted February 8, 2005 My coolant sensor was off by 45 degrees and my air sensor was off by 73 degrees. ??????? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
JasonA Posted February 8, 2005 Report Share Posted February 8, 2005 Wow...with the sensors off that much, it looks like it was really screwing up the fuel mixtures (rich). Good to see ya got it fixed! Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
AaronM Posted February 9, 2005 Author Report Share Posted February 9, 2005 It sure drives a lot better now! Thank goodness for mechanics! 18 Year Old Male Black 1992 STS 4.9L 90,XXX Miles Flowmaster 80 series muffler Link to comment Share on other sites More sharing options...
Cadillac STS Posted February 9, 2005 Report Share Posted February 9, 2005 It sure drives a lot better now! Thank goodness for mechanics! So the car pulled harder when you adjusted your seat? So exactly what position did you set it at? jk Link to comment Share on other sites More sharing options...
JasonA Posted February 9, 2005 Report Share Posted February 9, 2005 This is a kind of interesting, and semi-related anecdote. Our Grand Caravan has power-adjustable pedals. Interestingly, you can adjust their position when you're driving down the road. I found this out yesterday evening, when I tried them to find out if they'll move when the van is in motion. They were adjusted all the way forward, so I tried to move them back, not expecting them to move when the van was in motion. My foot was steady on the gas, and as the pedals moved further back, the van started speeding up, because the pedal was effectively being pushed down further as I adjusted them outward. Weird! Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
AaronM Posted February 10, 2005 Author Report Share Posted February 10, 2005 HAHA, The seat was too far back so instead of pressing right in the middle, I was pressing it down at the bottom and rocking the pedal instead of pressing into it. That van part is funny! Must have been the nitrous button! 18 Year Old Male Black 1992 STS 4.9L 90,XXX Miles Flowmaster 80 series muffler Link to comment Share on other sites More sharing options...
seabass Posted February 10, 2005 Report Share Posted February 10, 2005 If I were to change my o2 censors, it should increase gas mileage ?Is this the same as the coolant censors and where are the coolant censors located ? Seabass 93 Sts Link to comment Share on other sites More sharing options...
JasonA Posted February 10, 2005 Report Share Posted February 10, 2005 If I were to change my o2 censors, it should increase gas mileage ?Is this the same as the coolant censors and where are the coolant censors located ? If you change your O2 sensors, it won't make a difference unless your current ones are bad, or "lazy". And depending on how many you have (up to four), it can be quite an expensive endeavor to change them "just cuz". On a Northstar, the coolant sensor is located (I believe) on the back end of the right side head, which would be at the driver's side rear corner of the engine. Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
Oldgamer Posted February 10, 2005 Report Share Posted February 10, 2005 Two bad temperature sensors at the same time on the same car. Sounds pretty strange to me. Can you tell a bit more, how you get the idea that sensors were bad, the simptoms. Any codes? Link to comment Share on other sites More sharing options...
AaronM Posted February 11, 2005 Author Report Share Posted February 11, 2005 I brought the car to a repair shop. It says that he found no codes. He then checked parameters and found out that the sensors were off by XX amount. All I know is my car is working great now! 18 Year Old Male Black 1992 STS 4.9L 90,XXX Miles Flowmaster 80 series muffler Link to comment Share on other sites More sharing options...
Oldgamer Posted February 11, 2005 Report Share Posted February 11, 2005 That is exact what I thought. I don't want to spoil your happiness, your'e right, your car works fine now, and this is the most important thing. I just always try to analyse whats happened and find the real cause of fault. I think that coolant temperature sensor was completely fine. The coolant temperature you read on a dash based on a sensor. If sensor was bad the readings were completely out of reality. Intermittent problems in wiring as bad connections or open circuits lead computer to write codes P013 or P014 as I recall. I'm sure that mechanic didn't give you the old temperature sensor, but if he did try to measure the resistance of it. In room temperature it should be around 3K ohm. Link to comment Share on other sites More sharing options...
adallak Posted February 11, 2005 Report Share Posted February 11, 2005 That is exact what I thought. I don't want to spoil your happiness, your'e right, your car works fine now, and this is the most important thing. I just always try to analyse whats happened and find the real cause of fault. I think that coolant temperature sensor was completely fine. The coolant temperature you read on a dash based on a sensor. If sensor was bad the readings were completely out of reality. Intermittent problems in wiring as bad connections or open circuits lead computer to write codes P013 or P014 as I recall. I'm sure that mechanic didn't give you the old temperature sensor, but if he did try to measure the resistance of it. In room temperature it should be around 3K ohm. Some mechanics may say a complete BS just to look smart and justify the cost of the repair The good thing is that your Caddy runs fine. Enjoy! The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
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