Question about 1988 Ford Crown Victoria

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Surge , 10 mpg, rich exhaust,

Runs lousy, have replaced all the temp. sensors,injectors,map,itack, complete tune up, only has 49k but I"m ready to junk it.....doesn't show any codes in computer, have been to four different shops, no vac or fuel leaks.. has black coating around fuel tank cover?? runs lilke its fuel starved when pushed to upper rpm scale////??? helllllllllpppppppppppp

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Check the catalytic converter it may be clogged and will run badly if it is clogged

Posted on Aug 27, 2008

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O2 sensors reads the amount of left over fuel in the exhaust and converts to a voltage signal so when voltage is around .800mv this is a rich condition and computer is commanding less fuel and .200mv is a lean condition computer is command more fuel. for rich condition problems check the following components. Fuel pressure regulator, leaking injectors, mass air flow meter, engine coolant temp sensor, map sensor.for a lean condition check engine vacuum leaks, exhaust leaks, air injection, map sensor, mass air flow sensor,fuel pressure regulator, fuel filter,injection

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Engine Smoking:
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Black Engine running rich Possible Failure
-Map sensor, fuel injector or fuel pressure regulator.
Blue -Replace Faulty Transmission modulator valve
White Possible Failure. -Head gasket.
Hope this tip helps.
r/
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1 Answer

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Would a bad air temp sensor make engine flood


If you are referring to the temp sensor at the intake or the oxygen sensor at the exhaust, it may cause it to flood. There could be several causes. But usually the problem may be traced to the MAP sensor or to the injectors. If the sensors are the issue the mixture would either be rich or lean. If the flooding is that bad I would check first the injectors. Have it cleaned out first and do a physical inspection on the parts.

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91 chevy 4.3 v-6 runs extremely rich when engine is cold gives codes 13, 33 and 54 I know what these codes are but I need to know is could the computer coolant temp sensor or the air cleaner temp sensor...


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The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".

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check to see if one of the injectors is pouring more gas than the other while idiling. if one of them is check the wires going to it to see if there is a short. if not the injector is probably junk.

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