This is topic o2 sensor ?'s in forum Tech Talk at Northern California Ford Owners  .


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Posted by johnson50 (Member # 4608) on :
 
i ran a diagnostic test and 41 and 91 came up. those two numbers are my o2 sensors. i changed the o2 sensors and again 41 and 91. and also my car runs like shit. has no power and exhaust pops when the throttle is mashed down. it hesitates and just plain runs like shit.
one more ?, if i have a o/r h pipe, should i get a check engine light from the o2 sensors because i have no cats or what? please help.
 

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Posted by SilverLX351 (Member # 3207) on :
 
The O/R H wont make it run different or throw a code. Sounds like your car has either too much or too little fuel pressure, or the timing is off.

Good luck!
 

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Posted by johnson50 (Member # 4608) on :
 
nope, timing is good. don't know about the fuel system. if you turn the key to the on position but not start the car, should the fuel pressure stay up or should it bleed down. because my pressure bleeds down to 0 in about 10 seconds.
 

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Posted by 9cobra9 (Member # 4470) on :
 
huh, i also have an o/r h without cats and have a check engine light on. i cant really notice a differance in the way the car is running but the light is on. would my aftermarket headers throw te code on or would mil's be good enough to take it out?
 

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Posted by Jeff S (Member # 371) on :
 
Have you changed/added any parts recently? What does your fuel system consist of?
 

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Posted by 94gt (Member # 3060) on :
 

quote:

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Originally posted by 9cobra9:
huh, i also have an o/r h without cats and have a check engine light on. i cant really notice a differance in the way the car is running but the light is on. would my aftermarket headers throw te code on or would mil's be good enough to take it out?

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do you have the MIL eliminators? those are mandatory on modulars when running any o/r mid pipe
 

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Posted by johnson50 (Member # 4608) on :
 
yes, i just swaped out a new 306 longblock. for a fuel system, i have 24 pound injectors, regulator, gauge, and 155 lph pump. the pump is new but i have a feeling it is bad.
 

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Posted by 04mustanggtkibby (Member # 4202) on :
 
I put my stock o2 sensors and tied the cords together on my Off road H. It wont run right if you dont got mil eliminators? I wans just going ti buy a programer.
 

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