Question about 1998 Lincoln Town Car
After it started i opened up the obd, showed a system too rich, oxygen sensor lean and cylinder 1 misfire. Changed both front oxygen sensors, ran good for a day, then same again. Probably didn't change a thing, it was just in the mood to run. Then plugged obd again, no faults. Changed fuel filter, restored the pump, changed coils, plugs, did iac, throttle, maf, egr, checked all wires i could find, hoses, vacuums, everything seems okay and nothing out of place, leaking or not screwed properly. Still all the same. Out of options and out my mind almost, any ideas? I would really appreciate it, thank you. :
Being in the mood to run makes a lot of sense - check out the movie Kelly's Heroes to learn what effect negative thoughts can have on mechanical gear...
There will be a pattern to what is happening, unfortunately such a pattern tends only to become obvious when the fault is found (often by accident). Something could be affected by temperature and/or humidity, for instance...
OBD diagnostic equipment should be able to tell you what is happening in real time (live data), though only within the bounds of what affects the exhaust emissions.
Continuous testing could be the way to success. A fuel pressure gauge can be "permanently" connected and continuously monitored while driving. Some electronic fuel pump relays behave intermittently during an extended period until complete failure.
(If a hall effect device is incorporated in the engine management, it is worth knowing these also can behave intermittently).
Temporary tell-tale lights can be installed allowing important power supplies to the management/injection/ignition to be continuously monitored...
Posted on Nov 07, 2019
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Posted on Jan 02, 2017
I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!
Posted on Oct 06, 2008
You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach
You learn the vehicles Systems,Test,then Replace,if you have a failed component.
Work on the Misfire Issues.
Then you lean O2 Codes will go away.
Not a the plugs.
Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors
Posted on Nov 24, 2010
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