1995 F150 Help - Can not fix!

LOOK2X · 2006-10-20T22:33:56+00:00

I have a 1995 F150 4X4 with a 5.0 Automatic. It runs fine sometimes but then it will bog under part throttle, pop back and run crappy until wide open throttle then it takes off and runs great. Always runs great at wide open throttle. Occasionally it will stumble at an idle but most of the time it idles perfect. It gives a lean code but as it is obd 1(stupid as I call it) no data stream. Here is what I have done so far. A lot of this is as it is my sons first truck and I just want it all ready as soon as he gets his license in the next month.New plugs, wires, cap, rotor & distributorChanged computer - same exact symptoms as the original oneFuel pressure test while driving on two tanks all is fineNew mass airNew fuel filterNew throttle position sensorCat is punched outO2 sensor was replaced before I got itCleaned all groundsIt doesn't skip or run bad on any cylinder but just like something is not telling the injectors to open all of the way until you hit wide open throttle then it goes great.It is worse up a hill but will do it on the flat also. The check engine light will cycle on and off but only shows the lean bank 1 code. I am hoping the different computer may come up with a new code.Thanks in advance for all of your suggestions!

Oct 20, 2006 22 Replies

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ds549 19 years ago

did you pull the timing advanceplug before timing? loose timing chain?

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Mike H 19 years ago

David M wrote: ...

OBB I - 1 sensor per converter per bank. So two banks, but one converter, one oxy sensor. Two banks and two converters, two oxy sensors.

OBD II - 2 sensors per converter per bank. Oxy sensors check exhaust ahead of the converter and then after the converter. Thus the efficiency of the converter can be validated and if a problem is detected a check engine light is lit.

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