pulled my codes, need help
Thread Starter
Safety Car
Joined: Sep 2003
Posts: 3,597
Likes: 22
From: Orange County NY
St. Jude Donor '10-'11-'12-'13
If you can actually hear the engine pinging under load, then the knock is real and the knock sensor is probably functioning correctly. It is also "hearing" that, and in turn, the ECM is retarding the timing.
I am unfamiliar with codes 72 and 74, but there are a few causes of knock. Check out this thread:
http://forums.corvetteforum.com/show....php?t=1431143
I am unfamiliar with codes 72 and 74, but there are a few causes of knock. Check out this thread:
http://forums.corvetteforum.com/show....php?t=1431143
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
ECM error code 41 is Cylinder Select Error.
Could also be related to your code 43 problem.
Manual says to reseat the Mem Cal. Open the hood disconnect the negative battery cable.
Unbolt the ECM (Box above the battery). Flip it upside down and you'll see a small access door. Remove the bolts and the small cover. You'll see the Mem Cal. Press on the two ejector handles and the Mem Cal will pop off.
On a 90 Vette the Mem Cal circuit board also contains the Electronic Spark Control circuitry.
Reseat it and see if that cures the problem.
Could also be related to your code 43 problem.
Manual says to reseat the Mem Cal. Open the hood disconnect the negative battery cable.
Unbolt the ECM (Box above the battery). Flip it upside down and you'll see a small access door. Remove the bolts and the small cover. You'll see the Mem Cal. Press on the two ejector handles and the Mem Cal will pop off.
On a 90 Vette the Mem Cal circuit board also contains the Electronic Spark Control circuitry.
Reseat it and see if that cures the problem.
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by pavell
DTC #43: Knock Sensor Circuit.
DTC #72: Vehicle Speed Sensor Loss.
DTC #74: Traction Control System Circuit Low
This kind of puzzled me, my l98 has no traction control
