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Randy, Auto Specialist
Category: Cadillac
Satisfied Customers: 9756
Experience:  25 Years Experience Automotive Technology.
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Cadillac Deville: my 88deville is running rough. these codes

Customer Question

my 88deville is running rough. these codes are coming up E30 F28
Submitted: 2 years ago.
Category: Cadillac
Expert:  Randy replied 2 years ago.
The E30 Code indicates a fault with the Throttle Position Sensor. The TPS was 1.7 degrees or more while Idle Speed Control (ISC) was retracting for 15 seconds, or TPS was less than 12.75 degrees while ISC was extending for 15 seconds. Check TPS for adjustment and correct function. If adjustment is good and TPS is still out of range, replace TPS.