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Author
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Topic: SMOG help - high HC's & CO's
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1bdpone
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Member # 6708
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posted
 
 
I'm posting this for a friend, but here's what he has.
1986 F150 5.0. Here are the numbers...
HC CO NO
15MPH 131 320 169 : .87 2.17 1.09 : 1085 2050 537
25MPH 103 270 209 : 1.10 2.40 2.63 : 1120 2100 196
Numbers are in this order - MAX GP MEAS
He failed on HC and CO. I believe high HC means motor is running lean. but I do not know what high CO is? Any help would be great.
[ October 05, 2006, 03:44 PM: Message edited by: 1bdpone ]
Posts: 182 | From: Tri Valley | Registered: Apr 2006
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50DADDY
CAFords OG
Member # 3076
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posted
High HC is too hot,which can mean lean.Ive seen alot of times where this is because of plugged EGR passages.
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"Im not stupid,i just act that way so i dont make you dummies uncomfortable."
"Old age and treachery shall overcome youth and skill."
Posts: 4827 | From: Suckramento | Registered: Jul 2003
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Blind
2.3L
CAFords OG
Member # 3052
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posted
with the NO being so low, it looks like it's running really lean
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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S351-R
CAFords OG
Member # 1605
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posted
quote:
Originally posted by 1bdpone:
I'm posting this for a friend, but here's what he has.
1986 F150 5.0. Here are the numbers...
HC CO NO
15MPH 131 320 169 : .87 2.17 1.09 : 1085 2050 537
25MPH 103 270 209 : 1.10 2.40 2.63 : 1120 2100 196
Numbers are in this order - MAX GP MEAS
He failed on HC and CO. I believe high HC means motor is running lean. but I do not know what high CO is? Any help would be great.
HC=Hydro Carbons.
CO=Carbon Monoxide.
NO=Nitrogens of Oxides.
Hydro Carbons is more or less unburned fuel out the tail pipe. The high HC and CO coupled with the low NO shows the engine is running rich (the cooling effect of extra fuel in the combustion chamber causes low NO readings. A lean running condition would raise combustion chamber temperatures and therefore raise NO readings.).
Since it is an '86, the engine is fuel injected but not a MAF car and the fuel mixture is not adjustable. Things to check first: a good set of spark plugs, a properly working thermostat (a thermostat stuck open will not allow the engine to reach operating temperature and will run in constant "open loop" mode) and the MAP sensor. Check the condition of the vacuum tube going to the MAP sensor.
[ October 06, 2006, 01:40 PM: Message edited by: S351-R ]
Posts: 344 | From: Earth | Registered: Jul 2002
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Stangs R Us
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Member # 4495
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posted
dang what if my cuzin took in his car to get it smogged and it says gross polluter ![[Big Grin]](biggrin.gif) he only has 2 hi flo cats but still its all stock besides that but i know its running rich , what do i gota do?
Posts: 3100 | From: sacramento | Registered: Aug 2005
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jaybquick
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Member # 4286
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posted
What are your 02 readings? If the o2s are switching properly then it will read similar to that. The mustangs are very dependent on the Air pump system working. I need to know the 02 readings to see if the Air pump is working.
My 347 with a .600 plus lift cam passes with no problems. I am also a former smog tech.
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91 Mustang GT ET: 11.92@115
66 Mustang ET: 11.43@119
01 Audi S4 ET: 10.8@131
05 Audi S4 ET: 11.9@116
08 Audi S5 ET: 11.9@118
Posts: 416 | From: Lathrop | Registered: Mar 2004
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