My 04 Seville had several codes.

Tiny
RJOTWINS
  • MEMBER
  • 2004 CADILLAC SLS
  • 88,000 MILES
I've fixed several of the codes. I had a new tune up, o2 sensors, grumet. I still have p300 code and my car bogs down alot, plus it shakes at 500 rpms. It cuts off at times and I have to put it in neautral. My mechanic says I need crankshaft sensors. So what can I do?
Monday, November 14th, 2011 AT 10:44 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,127 POSTS
A PO300 is a random misfire. Many things can cause it. Start easy. Check for vacuum leaks, and check fuel pump pressure to make sure it is within spec.
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Monday, November 14th, 2011 AT 11:25 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
If you have the engine scoped they will tell what cylinder is causing the misfire. It may be a bad plug or wire.
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Tuesday, November 15th, 2011 AT 3:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs

2.Inadequate spark/coil,defective spark plug wire.

3.Lack of compression

4.False air leakage.

5.Faulty fuel injectors.

6.Insufficient fuel pressure.

7.Contaminated fuel.

8.EGR valve that is leaking.

9.Oxygen sensors.

10.Throttle position sensor.

11.Manifold absolute pressure sensor

12.Mass Airflow Sensor

13.Idle air control valve

Note: If it doesn't apply disregard it-
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Tuesday, November 15th, 2011 AT 3:55 PM

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