I have a 97 chevy k1500 with a 5.7 litre vortec. I have had the truck for 5 years and it has never had a cat converter since I have had it. It has always ran fine with no service engine light on. Recently the light came on and ever since it will not shift into overdrive and when it is warm and I go to start it, the engine will idle high, around 2000 rps, if I shift into drive it will die. If I wait till the idle slowly drops to about 9 or 800 rpms then it will go and I can drive it. However gas mileage is completely gone! Horrible gas mileage. I took it to a parts store and they said it was Ho2 sensor on bank 2 sensor 2. However I was told by a mechanic that I trust to be very knowledeable that an o2 sensor is going to be a waste of money without a catalytic converter. He said it could be a map sensor. Can you help me diagnose this so I dont have to take it in or throw away lots of money on parts I dont need please?
have the same problem?
Friday, April 26th, 2013 AT 12:16 PM