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1991 corolla 1.6L 4AFE.fuel injected. rpms high,misfire,weak acceleration,&exhaust/vacuum leak. other suggestions?

New sparkplugs and fuel filter. injectors are in decent condition. thinking of replacing(need info on)distributor/plug wires.alternator and air intake hose will be replaced&fuel system flushed. Is there something I'm missing?? Also, whats the safest way to flush the fuel lines/tank (i want to completely clean it, like soap and water type cleaned)?

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You may need new fuel filter. Seafoam works good to clean fuel system.or any reputable fuel sys cleaner. did you replace plugs or are you just thnking to? Trbl seems like stuck choke, if you have a carburated auto,ck that too.

Posted on May 20, 2017

Testimonial: "plugs are brand new, and its fuel injected. injectors have been checked (or so i was told) and seem to be fine. seems more like the engine is struggling to utilize gas more than not getting it. If that makes sense. and the filter was replaced about 6 months ago due to a fuel line leak and a mishap with diesel in the system. there is also a broken gasket in fuel pump, but i was told that wouldnt effect efficiency. (not sure if i should believe that, but ive went with it.) I'd like to stay away from cleaner fuels and id like to just pull the tank and wash it. lord only knows whats going on in the sludge puddle at the bottom of the tank.. lol"

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  • Cassie Bunch
    Cassie Bunch May 20, 2017

    plugs are brand new, and its fuel injected. injectors have been checked (or so i was told) and seem to be fine. seems more like the engine is struggling to utilize gas more than not getting it. If that makes sense. and the filter was replaced about 6 months ago due to a fuel line leak and a mishap with diesel in the system. there is also a broken gasket in fuel pump, but i was told that wouldnt effect efficiency. (not sure if i should believe that, but ive went with it.) I'd like to stay away from cleaner fluids and id like to just pull the tank and wash it. lord only knows whats going on in the sludge puddle at the bottom of the tank.. lol

  • George Momberger
    George Momberger May 20, 2017

    you never mentioned diesel fuel in original question....need to flush entire sys, gas engines do not burn diesel. it cloggs up the filter too.

  • Cassie Bunch
    Cassie Bunch May 21, 2017

    so again, what do i do to COMPLETELY flush the system? and im not sure that was a vital piece of information, because as i said, the filter has already been replaced and injectors checked. I know what happens with diesel/gas and their differences, but that problem was solved over 6 months ago and the issues were going on before that happened.

  • Joe Stanton May 22, 2017

    A 1991 could use the fuel pump due to age. the fuel tank has to come out to replace it, clean the fuel tank then. Todays methanol fuel will absorb water from the atmosphere, It is the #1 destroyer of fuel pumps and injectors. A regular change of fuel filter and use of B&G additive is cheap insurance for a clean fuel system and continued performance

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Your best bet on cleaning the fuel system is to add 1 can of B&G44K to the fuel. It is only available through dealership (11.00 a can at Toyota). It will condition your fuel pump and injectors. It is the best on the market and should not be substituted. Do this every 30,000 miles for continued performance.

Posted on May 20, 2017

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