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Search Auto Parts Search 1990 corvette codes Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes wayne k New User Mar 25, 2008, 2:45 PM Post #1 of 3 (3343 views) 1990 corvette codes Sign In My check engine light on my 90 vette comes on ocassionaly then goes off,I've also developed a rough idle.I did a code scan and came up with # 23 intake air temp. low, and #45 rich exhaust present.Any ideas what is setting off these codes?I suspect a bad O2 sensor but I'd like to get some other input . Thanks Wayne K Double J Veteran / Moderator Mar 25, 2008, 9:13 PM Post #2 of 3 (3337 views) Re: 1990 corvette codes Sign In I would look into addressing the code 23 first. A code 23 will set due to an open sensor,wire or connection or a faulty Ecm. Believe it or not,the last three code 23's I had all were because the sensor was left disconnected...all three had been to the quick lube places and when they inspected the air filter,they forgot to reconnect the sensor. As far as the code 45...if the ECM is commanding a richer mixture based on other inputs, this code could set . That could also explain the rough idle...possibly fouling the spark plugs . Just my thoughts See what the others think DanD Veteran / Moderator Mar 26, 2008, 9:03 AM Post #3 of 3 (3334 views) Re: 1990 corvette codes Sign In I agree with you Jim; if the air temp sensor has gone open, the ECM will be receiving a -40 degree signal. In turn the ECM will fatten up the mixture which could set the O2 code. If so you may have to replace the plugs after you get the temp sensor issue repaired; once a plug becomes fouled it usually doesn’t recover. Dan. Canadian "EH"   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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