My suburban takes about 5-7 min, depending on outside temps to idle down after it's started from an extended sit. Nothing makes me cringe more than watching my rpm's hover around 1200-1500 while the engine warms up. Especially with the gas prices the way they are today. What I'm doing is installing a heated O2 sensor in place of my non-heated one. NOTE: This write up is going to have specifics for a 1993 suburban. Other years MAY be similar, and possibly will be identical. This walk thru is meant as a guide on how to convert your non-heated O2 sensor to a heated one. You may have to do some independent thinking to get the job done for your application, if it is different from mine. Sorry, I just can't cover all makes and models. So, on to the good part. For starters you'll want to obtain a heated oxygen sensor. The method I used was to put the parts guy to work. Had him lookup the sensor for the 96 suburban with the 7.4L engine (the pre-cat sensor), and compared it to the sensor for the 93 suburban with the 7.4L The sensors were identical in thread, and diameter. The sensor I got is a Bosch #15732, and is regarded as a generic heated sensor. The great thing about this sensor is that it comes with it's own connector, so you can wire it up to just about any vehicle. Contents of box for Bosch heated oxygen sensor shown below: Next you'll want to obtain a 30Amp automotive relay. You can get these from Radioshack, auto parts stores, Car audio, and alarm shops have them as well. Make sure you get the harness to go with it, otherwise you'll either be soldering directly to the legs, or you'll have to go back out to get the harness later. If you don't already have it, now would be a great time to pick up a wire terminal set with a crimper. Probably the only specialty tool you'll need is for the sensor itself. However you could use an adjustable wrench, 7/8" wrench. But the proper socket is fairly cheap, and worth having. As you can see from the image below the socket has a slice up the slide, which allows for the wire to sit outside the socket, and not interfere with putting the sensor in.