My 1992 previa stutters and stalls at slow speeds - intermittant

SOURCE: 1990 Celica GT #4 cylinder is misfiring intermittently

shaft seal in dist is bad may be able to replace might have to replace dist

SOURCE: 1994 toyota pickup 4wd 22re hesitation and stalling

When the timing chains stretch( and they do!) they can cause the 22re to stumble intermittently. Have trouble starting, misfiring, and even some trouble codes But first check your engine for codes You can do this by jumping TE1 and E1


If you have codes we can go from there.
You should pull your valve cover and check you timing chain tension, it should be very tight and not loose. if it is loose it is most likely time for a new chain and/ or tension and guides. I always replace them as a kit. Keep in mind that if the chain is worn it will get progressively worse until the engine will not run or the chain will wear in to the water galleys behind the water pump on the timing chain cover. sorry man.

SOURCE: Code 25 for Toyota 3.0 3VZE

code 25 air fuel ratio lean condition indicated.POSSIBLE CAUSES- AIR LEAKS IN THE INTAKE MANIFOLD -EXHAUST MANIFOLD -EXHAUST PIPES- FUEL CONTROL SENSORS IS OUT OF CALIBRATION LIKE THE-ECT IAT MAF -LOW FUEL PRESSURE LIKE- FUEL FILTER CLOGGED PRESSURE REGULATOR FAILURE- ONE OR MORE FUEL INJECTORS RESTRICTED -HO2S ELEMENT IS CONTAMINATED DETERIORATED OR HAS FAILED -VACUUM HOSE IS DISCONNECTED BROKEN LEAKING OR LOOSE.

SOURCE: My 1995 Toyota Tacoma 4 cylinder 2.7 liter

Pull codes from OBD computer go from there. Could be other problems, check fuel pressure, All electrical connectors- loose, water, dirty, ground connections, etc. Could be a failing sensor. How do you know its missfiring on 3-4? one or two cylinders would be a really bad shake. Creek is to deep stay out of creek. Good luck!

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)

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