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P1506 - Not Going Away

Tiny
ANUP JAIN
  • MEMBER
  • 2002 FORD TAURUS
  • 3.0L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 128,000 MILES
MIL is on in my car with code - P1506.

Following things have been done for this -

1. Intake manifold gaskets has been replaced.
2. IAC valve has been replaced.
3. All the hoses (PCV) have been replaced.
4. Throttle Body has been replaced.
5. Smoke test done for checking vacuum leaks and there are none.

RPM has come down from 1200-1300 to 900-1000 now.
However the check engine light is on again with same code.

Also, EGR and EVAP is failing in OBD2 readiness.

What am I missing?
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Thursday, July 28th, 2016 AT 4:44 PM

10 Replies

Tiny
ANUP JAIN
  • MEMBER
  • 6 POSTS
I saw this - https://www.2carpros.com/questions/2000-ford-taurus-code-p1506

The difference between what has been done in this and here is .i have not replaced the DPFe sensor. Is this required?
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Thursday, July 28th, 2016 AT 4:46 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Did you say you replaced the PVC? That is the number one fix for the code. Looks like the code is more vacuum leak based for causes.
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Thursday, July 28th, 2016 AT 5:24 PM
Tiny
SATURNTECH9
  • MECHANIC
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The monitors I would not worry about until the code are fixed.
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Thursday, July 28th, 2016 AT 5:26 PM
Tiny
SATURNTECH9
  • MECHANIC
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If you did change the PVC did you changed the elbow with it?
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Thursday, July 28th, 2016 AT 5:28 PM
Tiny
ANUP JAIN
  • MEMBER
  • 6 POSTS
Yes, along with the elbow. the part which was used to replace. http://www.partsgeek.com/n5mfjmx-ford-taurus-pcv-hose.html?utm_source=shopzilla&utm_medium=pf&utm_content=dcs&utm_campaign=PartsGeek+ShopZilla&fp=pp&utm_term=Ford+PCV+Hose
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Friday, July 29th, 2016 AT 8:36 AM
Tiny
ANUP JAIN
  • MEMBER
  • 6 POSTS
I had a smoke test done. Did not find any vacuum leaks. Is there a chance that we missed anything in that?
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Friday, July 29th, 2016 AT 8:40 AM
Tiny
ANUP JAIN
  • MEMBER
  • 6 POSTS
Mechanic had tried to adjust the idle in throttle body. Could this be the problem?
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Friday, July 29th, 2016 AT 9:13 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Yeah, the idle stop screw should never be adjusted that is just what the factory set the throttle body plate at for base idle. I had a Ford that had the brake booster hose leaking. Anything is possible people can miss something when doing a smoke test. I do not know why he would adjust the throttle plate stop screw. That is meant to be that adjustment for the life of the car.
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Friday, July 29th, 2016 AT 12:26 PM
Tiny
ANUP JAIN
  • MEMBER
  • 6 POSTS
Hmm. Will go and do one more smoke test and check for any leaks. Can I change EGR sensor. And try?
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Friday, July 29th, 2016 AT 4:21 PM
Tiny
SATURNTECH9
  • MECHANIC
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I do not see the EGR sensor really effecting that code unless it is leaking vacuum.
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Friday, July 29th, 2016 AT 6:22 PM

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