SOURCE: spark on spark plug are yeloowish instead of
might be a bad coil, are all the sparks yellow or just one. all yellow check the coil, one yellow check the wire and plug
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
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.
Testimonial: "Fast response and good advice, I'll try these suggestions and let you know the results."
SOURCE: no pass smog...I need vacuum hose information for toyota corolla 1988 fx 1.6 4 cil. 4ALC aut. thanks
The parts Department at the local dealer May be able to print you out a copy,. if you ask nicely -- Otherwise,. a Haynes or Chilton repair manual will also have the details, but you got to look real careful at it as it is typically crossed with other stuff, like electrical or other diagrams incorporated into the same schemata... so as to confuse you? If you do not want to buy the repair manual for like $20 bucks,,,, check your local library, it's free - either way, call ahead for availability.
Best regards,
Ck
Engine
stalling issue at low speeds
This problem
is commonly caused by a dirty automatic idle speed control valve and
throttle valve. Buy a can of throttle valve cleaner from NAPA or
Carquest (made by CRC chemicals) and spray it into the air intake
while the engine is running, use up about 1/2 the can, engine will
try to stall hold the speed up, shut it down and let it soak for 30
minutes, restart and blow out the remaining fluid, shut it down and
disconnect the negative battery cable for 5 Min's to reset the base
idle control
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