92 Mustang Popping Hesitation

Rocky Rodriquez · Jan 23, 2017

Codes I got
67
81
82
85
84
29
34
41
91

Rocky Rodriquez · Jan 23, 2017

Codes I got
67
81
82
85
84
29
34
41
91

Mustang5L5 · Jan 23, 2017

Rocky Rodriquez said:
Gonna get codes today and let y'all know not going carb got to much in the harness it's a complete racing harness to o2 sensors to computer i have no salt and pepper shakers either

Who made the harness?

The problem with aftermarket harnesses is they tend to remove wires that are absolutely necessary. Probably the case with the VSS here which means you may need to add the wires.

67 - NSS circuit, possible wiring issue
81 - secondary air injection - smog deleted no big deal
82 - secondary air injection - smog deleted no big deal
85 - charcoal canister (assuming it's been deleted)
84 - EGR vac regulator - assume deleted
29 - No VSS signal - needed for Mass Air computer
34 - EGR valve
41 - O2 sensor
91 - O2 sensor

With that list, the ones I'd want to tackle first are 67, 29 and the 41/91.

The EGR ones will disable the function in the computer and the smog ones don't affect how the car runs. I'd probably check to see if the charcoal canister vent line from the gas tank is vented to a safe spot.

Rocky Rodriquez · Jan 23, 2017

Ford racing harness but the same codes came up with the old harness that's when I replaced the o2 sensors

Mustang5L5 · Jan 23, 2017

In that case, it may not be the sensors. There may be a big vacuum or exhaust leak causing the sensors readings to be off.

Black1987 · Jan 23, 2017

Just for curiosity sake: Does your car run fine and then while driving the car loads up and starts popping and potentially backfiring? Then randomly clears out and does it again intermittently?

Is the car a stick or auto?

Also are your O2 sensor 3pin or 4pin?

Rocky Rodriquez · Jan 23, 2017

Black1987 said:
Just for curiosity sake: Does your car run fine and then while driving the car loads up and starts popping and potentially backfiring? Then randomly clears out and does it again intermittently?

Is the car a stick or auto?

Also are your O2 sensor 3pin or 4pin?

Sometimes runs fine than all of a sudden you feel it like there's a trailer on the back and then starts popping and losing power slowing down I have a gauge on my fuel rail and answering about 30 want to bump it jumped down to about 24

Rocky Rodriquez · Jan 23, 2017

Damn auto correct the fuel pressure sits at 30lbs when bump the Excelerator it goes down to 24lbs

Mustang5L5 · Jan 23, 2017

I want to say mine sits at 30 and jumps to 39 when i give it load

General karthief · Jan 23, 2017

Off the cuff, I'd say you have a fuel delivery problem
Fuel pressure should rise when you hit the accelerator
Is your vacuum line hood up correctly
See post #10

Rocky Rodriquez · Jan 23, 2017

Well I'll drop the tank than thank you guys for the help I'll keep u updated

Rocky Rodriquez · Jan 23, 2017

Mustang5L5 said:
I want to say mine sits at 30 and jumps to 39 when i give it load

Ya just went double checked it again when I bump the throttle it might hit 31 than drops to 26 thank climbs back to 30lbs

Rocky Rodriquez · Jan 31, 2017

Up date changed the fuel pump sending unit and fuel tank has better fuel pressure but still popping and no power under a load than sometimes runs perfect

Rocky Rodriquez · Jan 31, 2017

Black1987 said:
Just for curiosity sake: Does your car run fine and then while driving the car loads up and starts popping and potentially backfiring? Then randomly clears out and does it again intermittently?

Is the car a stick or auto?

Also are your O2 sensor 3pin or 4pin?

I think 3 pin

General karthief · Jan 31, 2017

Did you change the fuel pump and filter?

Rocky Rodriquez · Jan 31, 2017

karthief said:
Did you change the fuel pump and filter?

New fuel pump, crap forgot about that

General karthief · Jan 31, 2017

You forgot to crap? Not good!
Now seriously, check your fuel pressure, should be 30+ lbs at idle with vacuum and 42 ish with vacume line unplugged.
I think you said you replaced fuel pressure regulator, is it adjustable?

Rocky Rodriquez · Feb 1, 2017

karthief said:
You forgot to crap? Not good!
Now seriously, check your fuel pressure, should be 30+ lbs at idle with vacuum and 42 ish with vacume line unplugged.
I think you said you replaced fuel pressure regulator, is it adjustable?

Ya is adjustable it sets at 32 and 39 unplugged

Black1987 · Feb 1, 2017

Rocky Rodriquez said:
Ya is adjustable it sets at 32 and 39 unplugged

Must missed but you never said if it was auto or manual trans. If its auto then the NSS should be jumpered, if its manual and you can start it without the clutch pushed in. Then the NSS either needs to be hooked up and or jumped.

The reason I ask about the trans is bc on our cars the O2s are specific to the trans. I know you said its an all inclusive Ford Racing harness but Im curious to know how the harness distinguishes between the two. Might be a question for Ford

Below is talking about my similar issue.

http://www.stangnet.com/mustang-forums/threads/o2-harness.894157/page-5#post-9010178

Lastly what computer are you using A9L, A3M. A9P, DA1, etc and is it tuned?

Rocky Rodriquez · Feb 1, 2017

A9l manual trans

92 Mustang Popping Hesitation

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