running rich ? ? no-check engine light

J

johnnyboy1111

New Member

Apr 27, 2004

84

0

0

Oct 12, 2004

#1

• Oct 12, 2004

• #1

Just put in new 02 sensors , erased codes , no check engine light has not come on after a 50 mile ride .... mac pro-chamber , no cats ,no air pump, maybe 25,000 miles on new stock injectors , fuel pump , fuel pressure reg , car is tuned , new wires ,new plugs{old plugs were like new 20,000 miles} , timing set slight advance over stock setting, after the 50 mile run at , still seems like its running rich , slight black inside tailpipes , cleaned after installing new 02 sensors, EGR is new .......any ideas ? ? ? .............. thanks

 

jaidedeye

Member

Apr 4, 2004

627

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16

Goldsboro nc

Oct 12, 2004

#2

• Oct 12, 2004

• #2

well with no cats you are gonna have some crap build up in your pipes. whats your fuel pressure at? set it between 35-40 psi with vac off.

 

J

johnnyboy1111

New Member

Apr 27, 2004

84

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0

Oct 12, 2004

#3

• Oct 12, 2004

• #3

rich

Thanks Jaid.....Its a stock ford pressure reg, I'll get a tester & see what it reads, thanks ...she has high miles but is still strong & uses no oil , I've changed most of the parts that were old and seemed worn....... its a 1990 Notch with the special service option but was never a Police car I bought it in 1994 & I cant ever see myself selling it, I've owned lots of cars in my lifetime the only other car I ever had that came close was a 1964 GTO and that was in 1970 ! hope I get a few reply's...................................

 

MurdockSVT

Founding Member

Jun 7, 2002

703

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0

Wisconsin

Oct 12, 2004

#4

• Oct 12, 2004

• #4

what do you mean seems rich? If you are refering to the black inside the pipes, what do you expect from an early 90s car with no cats

I think your best bet is to let the cars "feel" tell you how she is running. A good idle, with quick revs and quick drop in revs off the gas is usually a good indication both in sound and response in how the car is tuned. go do some nice 4th gear pulls from 1.5k to 5k and see how she responds. I wouldnt worry to much about the color inside your pipes.

 

88 Fox GT

Active Member

Nov 18, 2002

1,674

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Iowa

Oct 12, 2004

#5

• Oct 12, 2004

• #5

If your not getting any rich mixture codes, you should be ok. Like the others said, removing the cats will allow more of that black soot to build up.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

34

129

Oct 13, 2004

#6

• Oct 13, 2004

• #6

dont forget about the ECT and ACT sensors. they can be out of calibration but not out of spec (read wrong for the situation). good luck.

 

J

johnnyboy1111

New Member

Apr 27, 2004

84

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Oct 13, 2004

#7

• Oct 13, 2004

• #7

rich

Thanks to all ...................................Johnny

 

Michael Yount

Mustang Master

Apr 10, 2002

9,039

6

79

Charlotte, NC

Oct 13, 2004

#8

• Oct 13, 2004

• #8

The guys are right - black tail pipes and exhaust odor are no way to determine mixture. Get the thing on a dyno with a wide band to get some real mixture data.

If it's running good, getting reasonable mileage for the combo and you're not putting out any codes, then it's probably just fine.