Question about 1990 Mercury Topaz

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Fuel injection? 1990 Topaz-4 cylinder

Gasoline consumption decreased from 31 mpg to 24 mpg and stayed there. Car had been out of use for about six months. Then, running a bit rough on start up, before smoothing out. Then, when sitting idling, starts to run rough, may die. Then from an idle, when press down on throttle pedal, sometimes dies.
Inside of throttle body and intake manifold, quite damp with gas, when inspected.

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Since the car sat for 6 months it could be a vaccuum line the lines are rubber or hard plastic the tend 2 dry rot or chewed by small rodents, while the car is running listen 4 whistle or check for cracks or lines off completely

Posted on Sep 29, 2008


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    Where can i find the transmission type for a Kangoo 1.4 automatic

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    When i first got the car (used) the screen showed 27.5 mpg..... it keeps decreasing everytime i step into the car, even after ive filled the tank. when i press info it shows two arrows. can i increase or...

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    Have actually done some research on those and found that the horsepower increase advertised is in the higher RPM band (where in essence it is unusable). As far as fuel consumption goes, there is always a "trade-off" when it comes to that. On earlier carbureted engines it was fairly easy to squeeze more mpg from what you drive. Today's injection systems are very precise, and more difficult to get much more than factory standards from them. Three items you can do to get better mpg are: Keep the air filter clean (vacuum and shake out once a month), Use a good quality synthetic oil in the engine. Make sure your ignition system is in good condition and not arcing anywhere. Keep wires clean and plugs properly gaped (if you can't light the fire, you waste the fuel in that cylinder).
    A new problem we all face is the introduction of alcohol into our fuel...It does not produce the same btu's of heat when it burns...heat is power.
    the more alcohol in a system the lower the mpg is because it takes two times the quantity of alcohol to make the same amount of power.
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    Back to the "chip" ...I haven't seen anything there that would in any way justify the cost there. If $ were no object, I'd be more likely to put a turbo-charger on the engine and start looking at add-on overdrive units.
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    1992 mercury topaz auto/ 4 cyl//

    Did you fix this yet?
    Are you getting fuel to the plugs?
    Try starting the car, then remove one of the plugs. Check for the smell of fresh gasoline. You could also try smelling the exhaust to see if there is a fresh unburt gasoline smell.
    If your getting fuel, then the fuel system is probably not the problem.
    Are you getting spark to the plugs?
    After you replaced the Distributor, did you adjust the timing?

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