96 Mustang GT troble codes

[repsolrida69]

this is my first time here, and i hope some 1 can help me with a problem im having. I have a chek engien light on, and i conected the OBD II it gives me code po171 and 174 fuel to lean bank 1 and 2 i replaced the o2 sensors and the problem continued if any 1 has the solution i aprecheate it

[DeltaP]

Oxygen sensor not likely...but possible. Most likely: Dirty MAF sensor,(or too much oil on a K&N air filter), Vaccuum leaks,low fuel pressure or dirty,restricted fuel filter,fuel pressure regulator or hoses,sticking EGR valve,(less likely),bad DPFE sensor,(very likely). HTH

[danielsatur]

Do a smoke test and focus on the PCV, EGR, and the Air intake systems.
Any air leaks that's not measured will throw DTC's P0171 & P0174.

[repsolrida69]

how do you do a smoke test???

[repsolrida69]

I cleand the MAF sensor, air filter dosnt look to good, I do here air sucktion but havent ben able to find any air leaks. I did saw a plastik tubing dont know were it supose to connect. so i pluged it with a screw. i will try the other sujestions and i apreciate your assistance thanx both of you

[danielsatur]

I found a video on youtube, see http://www.youtube.com/watch?v=FfiQ7qWiG-M

[repsolrida69]

thanx that was really usefull information!! I will sure try this!

[danielsatur]

Do your own smoke test with a Black & mild cigar, or favorite smoke.
Blow smoke through your brake booster hose and cover with thumb between puffs.

How about a prescription for Pot, and use a police K9 to chase the problem down.

[repsolrida69]

Thanx! I went 2 auto Zone 2 c if they had 1 0f those smoke machines and they never herd of it. I replaced the intake and throtelbody gasket and the problem con tinews. I'll do the O rings 2 the injrctors next 2 c what happens.. U mention cigarret smoke wrks, does it or was that just a joke?

[repsolrida69]

Do you happen to know were i can get 1 of those smoke test matchin ? or if the 1 for the D.j's work ?

[DeltaP]

"U mention cigarret smoke wrks, does it or was that just a joke"?
Smoke is smoke. Yeah, it'll work. Check the DPFE sensor first. Its simple and they're famous for failing on Fords.

[danielsatur]

Yes - It's a Trade secret
Plug, or wrap plastic wrap around the air filter to block all air going to the Intake. This test can be done with engine off, it's alot safer than using starting fluid to chase a vacuum leak while engine running.

[repsolrida69]

thanx again i did fined the leak... It was the adjustment screw on the throtel body. It was missing I hadnt notice it because its located on the bottom of the throtel body and wen i would spray the injector it was close enough to suck it up. the smoke worked!