This is topic car wont smog running rich in forum Tech Talk at Northern California Ford Owners  .


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Posted by migs66/92 (Member # 4811) on :
 
help guys my 92 5.0 wont pass smog the tech said its running to rich what or where should I start.
 

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Posted by 1fast281 (Member # 4670) on :
 
what mods do you have? how old are the 02 sensors?
 

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Posted by Fostang (Member # 3752) on :
 
have you given the thing a basic tune up?
 

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Posted by FasterDamnit (Member # 442) on :
 
Post your smog test results and COMPLETE engine combo.
 

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Posted by 1WICKEDmach (Member # 4060) on :
 
I had the same problem with my 5.0. First check your O2 sensors, if that dosent work. Get an adjustable fuel pressure reg and a guage, so you can turn your fuel pressure down.

http://www.maximummotorsports.com/fuelgauge.asp

http://www.maximummotorsports.com/fuelregulator.asp
 

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Posted by blind (Member # 3052) on :
 
is it not true that an AFPR will cause you to fail visual smog check?


I'm having similar problems, and replacing the o2 sensors, the o2 harness, and the ECT has not seemed to help

currently I'm going to MAF (from SD) on my car in hopes that the new computer will throw codes, my SD computer has no codes in it ever, even when one of my plug wires popped off and it was running like shit
 

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Posted by migs66/92 (Member # 4811) on :
 
its your basic 5.0 no mods had it since may 04 first thing i did gave it a complete tune dont know how old the o2 sensors are
 

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Posted by FasterDamnit (Member # 442) on :
 

quote:

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Originally posted by FasterDamnit:
Post your smog test results and COMPLETE engine combo.

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Posted by AcesWild85 (Member # 2616) on :
 
what kind of thermostat is in it? If the engine is running a litte too cold it will also run a little rich ( to try to warm up the engine )
 

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Posted by 92stangLX (Member # 3252) on :
 
It really depends on what test you are failing. My 92' has most of the basic bolt ons (intake, injectors, maf, TB, exhaust, FPR, etc) and it was failing the NOX. The mechanic told me to change the cats *and* the EGR. I changed just the EGR ($110 fucking bux!) and it passed.

Not knowing what you are failing I would say tune the car (dist cap, fuel filter, plugs, wires, PCV), make sure your timing is at 10 degrees, clean the EGR valve, and change the oil. Also make sure the car is above operating temp before you test and go for it.

Is your check engine on?
 

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Posted by blind (Member # 3052) on :
 
I failed for HC and COx, hense the running rich complaint.

I believe running lean results in high NOx readings and/or bad cats, and in your case EGR
 

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