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Fail smog test.

Tiny
SANDY MENDOZA
  • MEMBER
  • 1994 FORD AEROSTAR
  • 320,000 MILES
First smog test failed on the 15 mph at a reading of 799. One of my friends said it was the egr value. Another friend said that there is no egr value on my aerostar. He replace the pvc value on it. Took it back to re-smog and now both the 15 and 25 mph failed. On the 15mph reading it said 701 and on the 25mph it said 585. Does the 1994 aerostar 3.0 have egr value? Is it something else. Please help me

just had the tune-up and the tran fluid change on it it run like a champ
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Tuesday, October 18th, 2011 AT 11:45 PM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What reading? You have hc co and nox whcih one?

Roy
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Tuesday, October 18th, 2011 AT 11:47 PM
Tiny
SANDY MENDOZA
  • MEMBER
  • 4 POSTS
It on the no ppm
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Tuesday, October 18th, 2011 AT 11:52 PM
Tiny
SANDY MENDOZA
  • MEMBER
  • 4 POSTS
It is on the no[ppm] reading on the smog test.
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Tuesday, October 18th, 2011 AT 11:54 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would look more toward the cat conveter. That is what breaks down the nox and eats it up.

Roy
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Tuesday, October 18th, 2011 AT 11:58 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the EGR, 3-way converter, or a computer controlled system that stays in the open loop mode-
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Tuesday, October 18th, 2011 AT 11:59 PM
Tiny
SANDY MENDOZA
  • MEMBER
  • 4 POSTS
HOW DO I FIND OUT WHAT NEEDS TO BE DONE WHEN TWO OF YOU GAVE ME TWO DIFFERENT ANSWERS! IS THERE A TEST THAT CAN TELL ME EXACTLY WHAT IS WRONG WITH IT
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Wednesday, October 19th, 2011 AT 12:23 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Thats what a shop is for. They can do the diagnostic and tell you exactly what the issue is.

We are both on the same track, not too different. Raz was telling you all the possibilities and I was telling you my expierence in the repairs I have done.

Roy
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Wednesday, October 19th, 2011 AT 12:34 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
3.0 liter has no EGR valve-lean towards the C/Converter
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Wednesday, October 19th, 2011 AT 12:36 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Let us know what's going on
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Wednesday, October 19th, 2011 AT 1:55 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
NOX failures can be due to carbon build up in the combustion chambers. I would need to know all the gas percentages and parts per million to plug into an equation and try and determine if the cat is at fault or if there is something in the engine or perhaps the injection system that is the cause of the failure.
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Thursday, October 20th, 2011 AT 2:22 PM

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