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1984 Ford F-150 FAIL FOR IDLE EMISSIONS

Tiny
MJGENTILE
  • MEMBER
  • 1984 FORD F-150
  • V8
  • 4WD
  • MANUAL
  • 250,000 MILES
I FIRST TOOK MY TRUCK TO INSPECTION IT FAILD FOR IDLE. PRIMARY EMISSIONS TEST PERFORMD: TSI-FAIL GAS HC PPM READING 350 STANDARD 220 CO%5.44, STANDARD 1.20 CO2%10.94 O2%1.35. I CHANGED THE PCV, PLUGS, CAP & ROTOR. PUT A VACUME GAUGE ON THE PRIMARY VACCUM FROM THE CARBURATOR. READING SHOWED 20 INCHES. I DID NOT CHANGE MY OIL. IT IS DO. I TOOK IT BACK THE SECOND TIME. IT FAILED AGAIN. SECIOND TEST. PRIMARY EMISSIONS TEST PERFORMD: TSI-FAIL GAS READING 350, STANDARD 220, CO% READING 5.14, STANDARD 1.20 CO2% READING 11.32 O2%0.94. IS THERE SOMTHING I'M MISSING. COULD ANYONE HELP ME. THANKS. MJGENTILE
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Saturday, March 13th, 2010 AT 4:57 PM

13 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
First, believe it or not, an oil change can help, but I doubt that much. It sounds like it is running rich (too much fuel). Has the check engine light come on? Have the oxygen sensors been checked?
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Saturday, March 13th, 2010 AT 5:01 PM
Tiny
MJGENTILE
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  • 7 POSTS
NO. I DON'T THINK I HAVE AN ENGINE CHECK LIGHT. IF I DO IT HAS NEVER COME ON. I THINK THE OXYGEN SENSOR WAS REPLACED. A LONG TIME AGO. MY FUEL FILTER NEEDS TO BE REPLACED TOO.
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Saturday, March 13th, 2010 AT 6:05 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
My concerns lead me to believe there is a sensor or O2 sensor problem. Also, keep in mind, with that many miles, there is a chance that a loss of compression can lead to the fuel not fully getting burned. I am sure there is a check engine light in the vehicle. What I want you to try is take the car to a nationally recognized parts store and ask them to scan the computer for codes. Chances are the light is burned out and there are trouble codes in the computer that will help identify the problem.
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Saturday, March 13th, 2010 AT 10:22 PM
Tiny
MJGENTILE
  • MEMBER
  • 7 POSTS
I AM THE SECOND OWNER OF THS TRUCK. I BOUGHT IT IN 1987 WITH ONLY 34000 MILES ON IT. THERE NEVER WAS AN ENGINE CHECK LIGHT THEN? AT A 180 TO 195,000 MILES THE OIL PRESSURE USE TO DROP LOW ONCE THE ENGINE WAS WARM. I HAD JASPER ENGINES REBUILD MY MOTOR. ROUGHLY THERE IS ABOUGHT 70,000 0N THE REBUILT MOTOR. WITH THE VACUUM TEST THEIR IS 20 Hg OF VACUUM. FOR THE PAST SEVERAL YEARS IT USED TO PASS. HIGH IDLE PASSES FIRST TIME HC PPM 66, CO%O.43, CO2%11.72, 02% 4.33. SECOND TIME HC PPM 77, CO%0.22 CO2% 12.38, O2% 3.58.
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Sunday, March 14th, 2010 AT 7:11 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Based on the info you provided, it is running rich. Have you had any work done to the carb?
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Sunday, March 14th, 2010 AT 4:16 PM
Tiny
MJGENTILE
  • MEMBER
  • 7 POSTS
NO I HAVE NOT. IS IT POSSIBLE TO JUST LEAN IT OUT? IF SO, HOW?
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Monday, March 15th, 2010 AT 4:52 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
If it does have a carb, make sure the choke is opening fully when the engine warms up. Also, there is a fuel and air mixture screw on the front bottom of the carb. I always turn them in the entire way and then 1 and 1/2 turns out. That is a good starting place. After that, you basically listen to where the engine runs the smoothest and the idle peaks.
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-1
Monday, March 15th, 2010 AT 8:04 AM
Tiny
MJGENTILE
  • MEMBER
  • 7 POSTS
OK THANKS I'LL GIVE IT A TRY.
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Tuesday, March 16th, 2010 AT 5:03 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Let me know if it helps.

Joe
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Tuesday, March 16th, 2010 AT 10:59 AM
Tiny
MJGENTILE
  • MEMBER
  • 7 POSTS
OK, I'M GOING TO TRY IT THIS FRIDAY. THANKS AGAIN JOE.
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Wednesday, March 17th, 2010 AT 5:05 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Let me know what you find.
Joe
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Wednesday, March 17th, 2010 AT 7:16 AM
Tiny
MJGENTILE
  • MEMBER
  • 7 POSTS
JOE, IT MADE IT HIGHER. I TOOK IT TO A VEHICLE RE- INSPECTON SHOP. THEY PUT IT ON THEIR MACHINE AND DIALED IT IN. THEY GOT IT DOWN TO 91 FOR THE HC. .39 FOR THE CO%. THANKS FOR HELPING ME. MIKE
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Sunday, March 28th, 2010 AT 6:57 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
So it passed?
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Monday, March 29th, 2010 AT 7:21 AM

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