Question about 1997 Toyota Tacoma

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Sluggish Two wheel drive extracab automatic.Very sluggish at higher speeds and on inclines. Throttle has to be pushed down all the way before transmission will downshift. Won't go any faster than about 75mph. Engine and transmission feel normal at lower speeds.When accelerating the engine while stopped ,the sound from the exhaust sounds flat as if engine not allowed to rev but different from a timing problem.

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  • jdomin8669 Sep 19, 2008

    I'm looking for possible solutions from auto repir mechanics.

  • jdomin8669 Sep 19, 2008

    Is the catalytic converter suspect in being clogged?

  • jdomin8669 Sep 19, 2008

    Would the check engine light come on if the CAT was glogged.

  • jdomin8669 Sep 19, 2008

    The vehicle appears to operate normally at lower speeds and on flat terrain. I've only had the vehicle about 1 year so I am not familiar with past performance. Because the check engine is not lit is the problem more likely to be fuel related? Could the timing be off also?

  • jdomin8669 Sep 19, 2008

    Thanks, my kind of solution.

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5 Answers

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???????? what great advice?!?!?!?!

change your fuel filter this will cause what your explaining and is a cheap thing to try.

when filter clogs it will restrict flow at higher speeds due to increased demand of fuel.

Posted on Sep 19, 2008

  • TripleTauto
    TripleTauto Sep 19, 2008

    no problem.

    this is routine maintence regardless so not a waste of money if not the problem.

    with the "quality" gas we get nowadays need to change about every 15-20k miles

    be careful as fuel will spray out when loosening lines

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1. Try adding supplemental fuel as the engine is bogging and determine if the engine will then accelerate, if so the engine is running too lean.

2. If the engine is lean check for low fuel pressure.

3. If fuel pressure is good, the mass air flow sensor may be faulty. With a faulty mass air flow sensor the calculated load readings will be really low when the engine is under hard acceleration. Check the calculated load readings to determine if they are higher or lower than 85%, if much lower than 85% try a new mass air flow sensor. The vehicle acts like it has a rev limiter on it.? 1. Monitor the crank position sensor AC output voltage at idle, there should be 3 volts and it should increase to 8v or more at 3000 RPM.

2. Remove the crank pulley bolt and the crankshaft pulley. Reinstall it, tightening it to the correct specifications. could be a Slightly loose crankshaft pulley
Crank position sensor The crankshaft pulley must be removed and reinstalled if it is the problem. Just checking to see if it is tight is not sufficient; they always check tight but are still a problem.

Posted on Sep 19, 2008

  • Jimmy
    Jimmy Sep 19, 2008

    also could be a timming belt issue. try cleaning the mass air flow first. only use electical parts cleaner. good luck

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Check to see if the catalytic converter is plugged.

Robert

Posted on Sep 19, 2008

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Check the compression. This problem often happens when the head gasket is gone and there is not enough compression.

If the engine is consuming water, then it is definitively the head gasket.

Let me know if this is the problem.

Posted on Sep 19, 2008

  • Ginko
    Ginko Sep 19, 2008

    From description it looks like the engine for some reason has not enough compression. Common cause for this is head gasket starting to go. check if your coolant liquid level is going down.

    If head gasket is fine, ensure the throttle cable is not getting stuck, and also check that it is not a clutch problem. When clutch gets worn, it will slip every time you push down the throttle pedal.

    If it is none of the above, then the problem must be related to fuel and injectors. The best way to test this is having the car electronic control module connected to a scanner, checking fuel volume and pressure.
    That can be done at any qualified garage.



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