Hard to start when the engine is warm?

1986 TOYOTA 4RUNNER
220,000 MILES • 2.4L • 4 CYL • 4WD • MANUAL
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JB361800
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I have the vehicle listed above with a 22RE engine. It will crank perfectly after it has sat, and the engine is cold. Once I crank it and the engine warms up, if I turn off the engine, it doesn't want to start back up until the engine has cooled down. I recently replaced the MAF sensor, cold start injector thermo time switch, ECU temperature sending unit, and the coolant temperature sensor for the gauge. None of these replacements fixed my problem. I can hear the fuel pump turn on when the ignition switch is turned on, and I can hear the circuit opening relay for the fuel pump making a "click" noise like it's supposed to. I am at a loss on what to check next. Any help would be greatly appreciated! Thanks!
Dec 4, 2023 at 10:34 PM
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To me it sounds like the fuel pump is getting weak, but we should run the codes to see if any are stored.

Here is a link to show you how:

https://www.2carpros.com/articles/toyota-trouble-code-definitions-and-code-gathering-method-1990-1995

Also, we should check the fuel pressure and I need to ask if you have changed out the fuel filter recently?

Fuel Pressure
Engine idling, with vacuum hose disconnected from pressure regulator .................... 2.3 - 2.7 kg/cm2 (33 - 38 psi, 226 - 265 kPa)
Engine idling, with vacuum hose connected to pressure regulator .................... 1.9 - 2.2 kg/cm2 (27 - 31 psi, 186 - 216 kPa)
Residual pressure with ignition key off .................... above 1.5 kg/cm2 (21 psi, 147 kpa) for 5 minutes

This guide can help you will need to rent a fuel pressure gauge from the auto parts store to help.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

This guide may help as well:

Here is how to change the pump and filter out in case you need it. Check out the images (below). Please let us know what happens.

Dec 5, 2023 at 9:12 AM