Backfire problems on my 1994 Mustang 5.0

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mustang1994

Member

Apr 19, 2009

58

0

6

Apr 19, 2009

#1

• Apr 19, 2009

• #1

This is what I did. I put 24lbs injectors in it. And this is the work I done to try to fix it. I put new plugs, new 9mm wires, new coil, new MSD cap and rotor, 2 new O2 sensors, and a 80mm MAF calibrated for 24lbs, put fuel injector cleaner, put the timing down to 12*. And it STILL backfires on normal driving.

 

toyman

10 Year Member

Jul 19, 2007

1,944

54

79

Vernon BC

Apr 19, 2009

#2

• Apr 19, 2009

• #2

mustang1994 said:

This is what I did. I put 24lbs injectors in it. And this is the work I done to try to fix it. I put new plugs, new 9mm wires, new coil, new MSD cap and rotor, 2 new O2 sensors, and a 80mm MAF calibrated for 24lbs, put fuel injector cleaner, put the timing down to 12*. And it STILL backfires on normal driving.

Click to expand...

And how does the PCM know you've changed injector anf MAF sizes? You may need a tune to resolve this.

 

desertcox05

New Member

Oct 3, 2007

379

0

0

south atlanta

Apr 20, 2009

#3

• Apr 20, 2009

• #3

double ck you firing order you could have mixed 1 or 2 up

 

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humphrey111

New Member

Aug 10, 2008

12

0

0

Apr 20, 2009

#4

• Apr 20, 2009

• #4

i just changed intakes and injectors and all that too. I had a horrible backfire and it ran like poo. My problem was the vacuum lines under the intake, replaced all those hoses and PCV and problem solved. computer takes a minute to adjust to new maf and injectors but shouldnt be the cause of the problem.

 

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NORCALBANDOG

15 Year Member

Nov 5, 2008

11

0

1

Kentucky

Apr 20, 2009

#5

• Apr 20, 2009

• #5

Do you have aftermarket headers installed? If you do, then check for any exhaust leaks from the header gaskets. I had an exhaust leak from a burned out header gasket that was giving me backfiring problems. As soon as I changed the gasket, the backfiring was eliminated.