service engine soon - 3 codes
02-26-2005, 06:11 PM
#1
Thread Starter
service engine soon - 3 codes
The lights been coming on after about 30 minutes of driving. At first, all I had was a code 23. Today I got a code 72 and 74. Car seems to be running fine also, though the exhaust does smell a bit rich (yet I'm getting great gas mileage (17.8 in the city and I have a lead foot))
btw, its a 93 LT1 Auto with 145K miles.
Any clue what these codes are and possible fixes? Only thing I've changed recently was the air filter. I put in an open lid and the new filter was a hell of a lot cleaner than my old one (both are K&N's)
btw, its a 93 LT1 Auto with 145K miles.
Any clue what these codes are and possible fixes? Only thing I've changed recently was the air filter. I put in an open lid and the new filter was a hell of a lot cleaner than my old one (both are K&N's)
02-26-2005, 10:16 PM
#2
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Originally Posted by vetteweiser
The lights been coming on after about 30 minutes of driving. At first, all I had was a code 23. Today I got a code 72 and 74. Car seems to be running fine also, though the exhaust does smell a bit rich (yet I'm getting great gas mileage (17.8 in the city and I have a lead foot))
btw, its a 93 LT1 Auto with 145K miles.
Any clue what these codes are and possible fixes? Only thing I've changed recently was the air filter. I put in an open lid and the new filter was a hell of a lot cleaner than my old one (both are K&N's)
btw, its a 93 LT1 Auto with 145K miles.
Any clue what these codes are and possible fixes? Only thing I've changed recently was the air filter. I put in an open lid and the new filter was a hell of a lot cleaner than my old one (both are K&N's)
ECM code 23 is Intake Air Temperature (IAT) Sensor (Low Temperature Indicated) Sensor is reading Air Temp below 35 degrees C
ECM code 72 Gear Selector Switch circuit
ECM code 74 Does not exist in my 93 service manual.
02-27-2005, 10:30 AM
#3
Le Mans Master
You'd be wise to invest in the Helms service manuals.For every code thrown it gives a trouble shooting flow chart on how to identify which component is causing the err code. It's alot better than just throwing $$$ at it. Maybe one of the guys with a manual for your specific year can help you out.