Question about 1988 Toyota Pickup

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My 1988 toyota pickup has started losing speed on even slight uphill roads and therefore speed on highway decreases from 65 down to 40 mph and I have to downshift to even go 40 until road goes level or downhill then I can pick up speed again. I have owned it for 5 years and previous owner overhauled engine and I have put less then 10,000 miles on it in 5 years. Total miles=239,000.

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You can start with a mayor tune up including wires.

Blockage on Catalytic converter, remove O2 sensors and see if engine gain power.

Transmission fluid level and condition.

Timing, if timing belt jump a tooth loose of power may happen.

Ignition coil ( the spark has to be nice and blue an orange spark means weak coil.

Posted on Dec 31, 2010

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Hello Scott.

Your problem could be a few different things.
First thing is a possible restricted fuel filter. When under load of course your pickup uses more fuel. If the filter is only capable of flowing a small amount of fuel it will not allow full power.
Secondly is a partially plugged exhaust system. If indeed the motor was overhauled it may have damaged the catalytic converter with excess oil.
You will need to have the pressure tested in the exhaust in the pipe ahead of the converter. It should not be more than 1 PSI.
Next is the intake. If the air filter is plugged up it will do the same as the exhaust. No air-no power.
I have also seen where a rag has gotten sucked into the air duct.

If you check those items out I am confident you will find your problem.
Thank you for using FixYa. Happy New Year.

KL

Posted on Dec 31, 2010

  • FUBAR Jan 08, 2011

    Hello Scott.

    I have not seen a reply from your question.
    Did you check it out as suggested?
    I hope that the advise was helpful.

    KL

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