Fuel burning rich on DOHC swap

K

kirk69

New Member

Dec 31, 2008

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May 18, 2009

#1

• May 18, 2009

• #1

Hey there. Does anyone have anything for me? I swapped my SOHC in my 2000 GT auto, to a 2001 DOHC Cobra 5 speed, now it smokes after car is warmed up. It smells like it is burning really rich. I had a shop set up my Excalibrator 2 to turn off back O2 sensors, but it still does it. After I rev up the engine it takes a few seconds for it to idle be to normal. It idles back to about 1100 RPM before returning to normal after a few seconds. Is it maybe the front O2 sensors, or is there something else causing this? I would really appreciate some help with this. Thanks

 

dastang2

Active Member

Dec 11, 2003

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tx

May 18, 2009

#2

• May 18, 2009

• #2

i know a guy in our local club that did the aviator 4v swap and he did all the wiring himself and finally got it right. i will let him know if you can pm me a cell number i can get you in touch. he had the same problem.

 

K

kirk69

New Member

Dec 31, 2008

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May 19, 2009

#3

• May 19, 2009

• #3

Thanks! The more info the better!

 

BlownFiveLiter

have car, will race....wait, it doesn't run

15 Year Member

Nov 29, 1999

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Chicagoland

May 19, 2009

#4

• May 19, 2009

• #4

You likely need a tune. Turning off the rear O2's won't solve anything, as they're just there to ensure the catalytic converters are doing their job.

 

dastang2

Active Member

Dec 11, 2003

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May 19, 2009

#5

• May 19, 2009

• #5

oh yeah def. needs the tune after you have the wiring correct.

 

SVT32VDOHC

waiting for the next hack atta

Founding Member

Nov 22, 2001

3,501

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119

Motor City

May 19, 2009

#6

• May 19, 2009

• #6

I vote tune as well, but first....what computer did you use? What wiring did you use? I hope you swapped as much as you could from the donor car.

 

K

kirk69

New Member

Dec 31, 2008

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May 19, 2009

#7

• May 19, 2009

• #7

I swapped out all wiring plus the computer. I have a MAC prochamber on it from the SOHC engine. I change almost every sensor involved with the fuel system, but it still smokes. The donar car was still running when I bought the motor, and it wasn't smoking or running rich before it was taken out of the Cobra. The car still runs very strong, but puffs out smoke after it is warmed up.

 

dastang2

Active Member

Dec 11, 2003

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May 19, 2009

#8

• May 19, 2009

• #8

so you changed the maf sensor also if you are using the cobra injectors you have to use the maf that is calibrated for those. if you are then look for vacuum leaks. did you have a returnless fuel system on your car before and now.

 

K

kirk69

New Member

Dec 31, 2008

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May 20, 2009

#9

• May 20, 2009

• #9

I have the stock 2000 GT fuel system, and I assume it is the same as the 2001 cobra. I used the MAF from the Cobra. i also have 21 inch lbs. of vac. at idle

 

squeak93

15 Year Member

Jun 2, 2005

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Joplin, Missouri

May 20, 2009

#10

• May 20, 2009

• #10

Do you have any codes? What does your fuel pressue do while under a load? What tune is on it? Stock 01 cobra? (I assume since it looks as if you used the puter). How much fp do you have?

 

K

kirk69

New Member

Dec 31, 2008

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May 20, 2009

#11

• May 20, 2009

• #11

It has the stock computer with a stock tune except for aft O2's are shut off and traction contol is off with 3.73 gears. I don't have a fuel pressure gauge. I guess I should invest in one. Oh yeah, no codes on computer.

 

squeak93

15 Year Member

Jun 2, 2005

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Joplin, Missouri

May 20, 2009

#12

• May 20, 2009

• #12

Did the cobra come stock with the pink injectors?

 

K

kirk69

New Member

Dec 31, 2008

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May 20, 2009

#13

• May 20, 2009

• #13

The injectors are all black.