EurosportZ34 Posted August 14, 2003 Report Posted August 14, 2003 I just recently purchased a '92 Lumina Z34 with the 3.4L DOHC V6. While driving my car I notice that the 'Serivce Engine Soon' light comes on frequently when the cars has 'warmed up', but I turn the car off and start it up again and the light stays off. What gives?? I also own a '91 Lumina Euro with the 3.1L MPFI V6 and this light has never came on before. What's up with this light??? Any help would be greatly appreciated! Quote
Redfox340 Posted August 14, 2003 Report Posted August 14, 2003 Well, a Service Engine Light idicates a problem with the powertrain. Each main circuit of the motor is tied into the Electronic Controlled Module (ECM). If a sensor or circuit falls out (higher or lower values that what's expected), you'll see a SES light. To figure out the code on your On-Board Dignositic (OBDI) system, ground the dignostics ports together. A paper clips can be used; check W-Body Performance - Computer Dignostics for more details. Once grounded, read the code(s) and compare on W-Body.com - ECM Trouble Codes. From there, it's bascially finding the circuit to faulty sensor that creating a problem. Piece of cake! Best of luck! - Erik Quote
Slade901 Posted August 14, 2003 Report Posted August 14, 2003 Did you check the oil fluid level when the engine is cold? Quote
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