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2005 Cadillac STS Cadillac injector problems

Tiny
SANTLEY
  • MEMBER
  • 2005 CADILLAC STS
  • 3.6L
  • V6
  • RWD
  • AUTOMATIC
  • 170,000 MILES
Im recieving codes PO204 & Po304. The car will run good one day, and bad the next. Ive replased the injector and injector connector. Still getting same codes. Car will run good for a while then act up all in the same trip
Thursday, March 5th, 2015 AT 8:03 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
The P0304 is the result of P0204. There is most likely a wiring issue between the injector and the PCM. Have you checked the entire wire? Also, if you start the engine when it is running properly and move the injector wiring for cylinder 4 around, does it cause the problem to reoccur? If there is no change, then I would recommend checking the connection at the PCM itself. You need to check both the power supply from the PCM as well as the ground for the circuit.
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Friday, March 6th, 2015 AT 9:16 AM
Tiny
SANTLEY
  • MEMBER
  • 2 POSTS
Ive moved the wires and connector around while the car is running. Haven't been able to get it to act up or straighten up but majority of the wiring is under the upper intake. It will act up, can shut the car off for a few seconds and start back up and be ok. Can the ECM cause this problem?
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Friday, March 6th, 2015 AT 9:40 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Yes, it can be the cause.
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Saturday, March 7th, 2015 AT 6:45 PM

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