When i first start it, idling is fine, go to start out and it like it is out of power, backfires on occasion,push the gas pedel all the way down and it runs strong. we have replaced fuel pump, fuel filter, clean itnighters replaced mass air flow system,efi temp control,new plugs,cleaned intake manifold cleaned throttle body,checked cap and rotor,
Just change your spark plug lead wires. Very notorious item
Not sure what itnighters are, sorry.
You seem to be describing a flat spot - a hesitation during initial acceleration that is commonly caused by either insufficient spark power or the fuel system being slow to adjust to the new requirements.
A backfire is an explosion in the exhaust system and I wonder if you really meant a spit-back (through the intake), which is common with a fuelling caused flat spot?
Replacing the spark plugs is merely half the job and testing the spark power is the other half...
I suggest you check the fuel pressures and pressure regulator function and the injector spray patterns. Only if all tests good it could be worth testing the oxygen sensor...
SOURCE: 22RE no power. 240K on body Rebuilt motor w/ 1k on it.
check to see if plug wires are cracked or burnt threw from laying on exhaust manifold
SOURCE: Idle low and dies out if I don't keep my foot
I had same problem with Scion. Took it to a Mobil One quick oil change place. Flushed injectors. It was under $100 and ran like new.
SOURCE: 87 Toyota Celica total power loss
Replace the Fuel Pump. I had the same problem and i did everything you did to find out that it was the fuel pump. I removed the tank and repaced the fuel pump and bingo! No more problems the car runs like new
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: 1986 toyota truck 4x4, 4cyl,
The igniter interprets signals of time and position from the distributor, fits the efi ecu with information and then the ecu gets back to igniter to tell it when to fire specific cylinder, we used to have problems with the distributors and also igniters.
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You cannot clean ignites it would not help if the electronics 've failed. So if you 've lead wires, change them or get diagnose the ignitors
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