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Author
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Topic: failed smog x2
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Stimpys 5.0
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Member # 5829
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posted
 
 
hey guys i need some help. i have a 90 coupe all stock, except with bbk shorty headers, 2 chamber flows with dumps and a cai. the knocks(NO) were extremely high. the numbers were:
first try
15 mph max 807 i ran 1841
25 mph max 746 i ran 1273
second try
15 mph max 807 i ran 1505
25 mph max 746 i ran 0918
after the 1st smog i went and drop the timing 3 degrees, it was at 11* to begin with. changed the plugs from a 25 to a 24. then change the egr w/sensor. so after all the little work it only went down by 336 @15 mph, and down 355 @ 25mph.
after i got home from the last run a buddy and i pulled codes and we got 31,33,41,91. any help or comments would be greatly appreciated. thanks guys....
[ April 25, 2008, 01:49 AM: Message edited by: Stimpys 5.0 ]
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1989 burgundy coupe
1968 mustang 289 - 4 speed
1989 white lx (totalled)
Posts: 646 | From: sac/916 | Registered: Jul 2005
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89nitrous stang
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Member # 8352
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posted
i took my air filter out and it went down by 300 it seemed to make it more lean thou. also had the 41 code and passed with it.
Posts: 63 | From: oakland | Registered: Apr 2008
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BlowN67
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Member # 4229
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posted
i could be wrong but i thought u would want it to run hotter plugs to burn that shit out, but i honestly dont know smog.
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AIM gonein67 JOHN
* californiafords.com
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* theturboforums.com
Posts: 9809 | From: Home of LARD | Registered: Mar 2004
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venomous99
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Member # 1917
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posted
code 31: PFE or EVP circuit below minimum voltage of 0.24 volts.
code 33: EGR valve opening not detected.
code 41: HEGO sensor circuit indicates system lean (right side)
code 91: HEGO sensor circuit indicates system lean (left side)
this was taken from fordfuelinjection.com
you may want to run a key on engine off(KOEO) test as well to see if something comes up.
ive seen the code 41/91, o2 measuring lean condition before when i had a massive vacuum leak going into the evap canister. since your car is stock you may want to check your vacuum to see if its normal. is your idle smooth?
do you have the egr hooked up? looks like
of the 4 i think you're failing more due to the 02s measuring lean as a result of some sort of unmetered air via a vacuum leak, which then triggers the ecu to start dumping more fuel to correct the lean condition. as soon as i fixed the vacuum leak the code 41/91 went away.
[ April 25, 2008, 03:46 PM: Message edited by: venomous99 ]
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MKII Q7
89LX
Posts: 4811 | From: dc | Registered: Oct 2002
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1FAST89GT
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Member # 5071
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posted
get that shit nice and hot and test it-if that does not work check o2
Posts: 4915 | From: VALLEJO | Registered: May 2004
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Blind
2.3L
CAFords OG
Member # 3052
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posted
33/41/91 sounds like a vacuum leak related problem to me, egr opens with vacuum so if you've got a leak it won't open, and will cause the computer to think it's running lean because of unmetered air coming in, so it's dumping fuel.
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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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Stimpys 5.0
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Member # 5829
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posted
i checked all vac lines they all seem fine. i did take the egr back off and cleaned it with carb cleaner. and swapped out the o2's with my other 50. after the cleaning and o2s i reset the batt. and drove it for 20 min. no codes i also just went ahead and replaced the intake with the original(found someone to lend it to me). so were off to the 3dr try thanks for all you input will keep you guys updated.
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1989 burgundy coupe
1968 mustang 289 - 4 speed
1989 white lx (totalled)
Posts: 646 | From: sac/916 | Registered: Jul 2005
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