2005 Cadillac Deville gas cap

Tiny
ROOLOVER
  • MEMBER
  • 2005 CADILLAC DEVILLE
  • 4.6L
  • V8
  • FWD
  • AUTOMATIC
  • 8,900 MILES
Had to put another motor in Cadillac deville 4.6 I had to put one that came out of 04 engine light never came on tell I put the other engine in it then my information center said check gas cap put a new one on it and light still on should I drive it a while for light to go off any information would help its my wife car and she cant stand that light help
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Monday, July 14th, 2014 AT 3:57 PM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
What I need you to do is take the car to a nationally recognized parts store and have them scan the computer to see what trouble code is stored. Most do it for free. If I had to guess, I would say there is an EVAP system leak caused when the engine was replaced. However, I need to know the code to guide you properly.
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Monday, July 14th, 2014 AT 7:54 PM
Tiny
ROOLOVER
  • MEMBER
I took car to oriley and got a scan and I had code p1404-po174-po443 im confused but couldn't it be the egr that's causing this and where is it located at on engine trying to figure this one out
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Friday, July 18th, 2014 AT 3:32 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
The P1404 indicates that the EGR is staying closed.

The PO174 indicates a lean fuel trim mixture.

The PO443 deals with the purge control in the EVAP system malfunctioning.

The first two codes could be related. The EGR code is most likely the result of either a bad valve or carbon build up on the pintle. It could also require that the PCM be reprogrammed. As far as the EGR, it should be mounted on the intake manifold. Check to make sure the wiring to it is connected. If it is and it looks okay, remove the EGR and check for carbon build up. I believe if the valve is in the closed position, it could cause the computer to over compensate and run the system too lean. Thus, setting the PO174.

If that isn't the case, a PO174 can be caused by any of the following:

- Engine vacuum leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow sensor
- Incorrect Positive Crankcase Ventilation hose connection

My first guess would be a vacuum leak which can happen very easily when an engine is replaced.

As for the PO443, my guess is this is the result of the engine replacement. It can be caused by any of the following:

- Faulty EVAP Purge Solenoid Control
- EVAP Purge Solenoid Control harness is open or shorted
- EVAP Purge Solenoid Control circuit poor electrical connection

Other than the solenoid being bad, basically, this is saying there is a bad connection to it. A wire may not be connected, damaged, corroded. Since none of these things were issues before the work was done, I think you may want to contact the shop that did the work and request that they help.

Let me know if I can help in any other way.

Joe
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Sunday, July 20th, 2014 AT 8:12 PM

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