2000 Taurus SE - P1174/1131/1151/171errors

RCC407

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6cyl begins missing/chugs and then dies on idle below 1000RPM, otherwise runs fine. 75K miles, fuel pressure is around 36, is this ok or should it be around 60-65? Put an idle air sensor on already, am not finding any leaks. Need help!
 

Jim Fairbanks

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Most of those are lean codes...I couldn't find a P1171, or P1174...What is the 8th digit on the VIN?...I think fuel pressure is close...Can find out for sure when I get the engine code.....Jim
 

Dave

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P1174 cam sensor
P1171 rotor sensor
1131 Lack of upstream heated oxygen sensor switch - sensor indicates lean - bank 1
P1151 Lack of upstream heated oxygen sensor switch - sensor indicates lean - bank 2

the cam sensor and rotor sensor is probably going to be the cause of your driveability problems.
 

RCC407

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Vin code digit #8 is "U". I did screw up on the codes...P0174=fuel trim system lean bank 2 and P0171=fuel trim system lean bank 1. The P1151 and P1131 were correct codes. Our initial thought is to put in a fuel pump but hate to and find that was not the issue, would think a fuel pump would also prevent the car from running fine at higher RPM than 1000.
 

Jim Fairbanks

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The fuel pressure should be 35-55 psi....that's on the low side...Those codes still show a lean condition...Have you changed the fuel filter?......Does it run good at highway speeds?....How about when accelerating hard?....Sounds like either a weak pump or bad fuel filter..I would do another fuel pressure test and change the filter....Jim
 

RedDog

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#.0 litre vin code u P0171 P0174 indicate both banks lean, cure the lean problem and the other o2 codes will probably go away. I would check for a vacuum leak, Smoke machine is the best way. Also remove the air flow meter and look at sensor - 2 very small wires, they are probably dirty, clean the flow meter, I use carb cleaner spray can, blow dry with lite air pressure, critical that the flow meter not be dirty, those wires should be white - inspect with magnfying glass if needed, re-install flow meter clear codes, test drive. Also , if flow meter was contaminated, replace air filter.
 
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