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I have a 1989 toyota pickup 4x4 4 cyl. It will start and I can drive it. But it has no power. It takes a while for it get up to 45mph. And also once it warms up to temp. It wants to cut off if I dont keep my foot on the accelerator. Ive changed the fuel filter, fuel pump, mass air flow sensor, distributor cap n button, computer, plugs n wires, and muffler. It just has no get up and go. What can it be?

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You have done a lot, have you been able to have it checked for codes. where I live several of the auto parts store will check and give you the codes they find for free. You probably know when you disconnect the battery it will erase the codes. If your check engine lights is on you should have codes.

Posted on Aug 04, 2017

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Catalytic converter

Posted on Aug 04, 2017

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Posted on Jan 02, 2017

SOURCE: 1990 4Runner, 3.0 L engine, won't hold idle, wants

Have you looked at your idle air control valve What is it? This is an electrically driven valve that allows additional control over the throttle at idle Where is it located? The IAC is located on or adjacent to the throttle body and consists of a small device held on by two bolts with an electrical connector.
How does it work? When the throttle is closed the throttle plate closes off any air from the intake manifold. In order to stop the engine from stalling due to lack of air the IAC opens a small valve allowing air to pass from the air ducting to the intake manifold. Often the IAC components consist of an air inlet port in the inside wall of the throttle body, immediately in front of the throttle plate, with a similar exit port behind the throttle plate. Connecting the two ports is a motor driven valve. When the valve is opened air effectively by-passes the closed throttle plate to maintain the engine at idle. The IAC also augments the throttle when additional power demands are put on the engine such as steering.


Symptoms of faulty IAC

  • Poor starting: If the IAC fails to open or the inlet/exit ports are clogged shut with carbon the engine may start and then promptly stall. The engine can be kept running by pressing the accelerator. However any additional demand on the engine such as power steering or putting the car into drive (automatic) will cause the engine to stumble badly and often stall.
  • Engine cut out: Even with the engine warmed when the vehicle is stationary such as at a red light the putting of the transmission into of 'drive' to pull away before the accelerator is pressed can cause the engine to stall. (Note this differs from the TPS fault which causes engine stall due to the accelerator being pressed too quickly)

How to check? Physically remove the IAC but keep the electrical connection to it. Temporarily block off the now open ports on the throttle, turn the engine on and examine the IAC valve action in response to additional loads (power steering inputs etc). The valve should open and close according to demand.

How to fix? If the motor of the IAC has failed then replace the IAC. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with carburetor choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IAC look blocked again clean them out thoroughly.

Posted on Jun 03, 2010

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