- Jan 21, 2017
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92 Mustang Popping Hesitation
- Thread starter Rocky Rodriquez
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- popping hesitation
- Jan 21, 2017
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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.
- Jan 21, 2017
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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.
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?
Is the car a stick or auto?
Also are your O2 sensor 3pin or 4pin?
- Jan 21, 2017
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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
- Jan 21, 2017
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Damn auto correct the fuel pressure sits at 30lbs when bump the Excelerator it goes down to 24lbs
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
Fuel pressure should rise when you hit the accelerator
Is your vacuum line hood up correctly
See post #10
- Jan 21, 2017
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- Jan 21, 2017
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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
- Jan 21, 2017
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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
- Jan 21, 2017
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- Jan 21, 2017
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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?
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?
- Jan 21, 2017
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Ya is adjustable it sets at 32 and 39 unpluggedYou 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?
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?
- Jan 21, 2017
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