Question about 1985 Mercury Topaz

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1985 merc topaz 2.3, the TBI is way too rich, Ive replaced the OXY sensor, top end better, but way too much fuel still, milage down from 30 mpg to -10 mpg---defictive fuel enjector ???--or what---is there a code reader for my year and model for this problem???--

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Check your fuel pressure regulator

Posted on Dec 31, 2010

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Buick regal 92 3.8L Horrible fuel mileage


Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.

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1 Answer

1990 MERCURY TOPAZ


sounds like your egr valve is stuck open. check for false vacuum signal to egr valve holding it open or for a plain old bad stuck open EGR valve.

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First thing you need to do is have a code check done (most larger parts stores do this free) For the time being, ignore any O2 sensor codes...Usually that sensor reads rich condition and if too severe it throws a code of it's own but it may be false. Pay attention to temp sensor, manifold temp sensor and other fuel management items. Also, check your fuel pressure regulator...if malfunctioning default is full pressure.

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1 Answer

Running extremly rich


I recommend you check the fuel pressure regulator diaphragm for proper installation and tears. Did you get a new one with your rebuild kit?

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2003 dodge neon hybred


You have to bring the hydrogen in after the airfilter and before the mass flow air meter and you will not have to mess with the oxygen sensor.

Power to your hydrogen sensor should only be applied when your fuel pump circuit is on and in addition to that you should have yet another manual switch after that with some sort of armed light to let you know your are making hydrogen.

There is a guy here in Austin with a Ford windstar van that has done this and gone from 19 mpg to 30 mpg.

All of this is done at your own risk.

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