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1990 4Runner v6 wont start when warm

Old 09-27-2016, 04:10 PM
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1990 4Runner v6 wont start when warm

I am having some problems troubleshooting this issue. ill drive the truck anywhere from 10 min or more and when i turn it off and leave it for about 10-15 min and then try to start it again, it will idle at about 500 rpm for half a second and then die, and then will just crank like a champ but wont start. I have to let it sit upwards of 2 hours at least before it starts again, sometimes have to let it sit over night. i just did the fuel pump, fuel filter, injectors, fuel pressure reg, intake manifold vacuum lines, cleaned mass airflow sensor. at first i thought it was flooding but i checked the plugs and they were dry as a bone. I am still researching but any ideas or help on what could be causing this would be awesome!! its all happening on a 1990 4Runner, 3.0 . thanks!
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Old 09-27-2016, 04:59 PM
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Can you hear the fuel pump when in a no start condition? You can jump FP and B+ in the diagnostic port to run the pump constant, bypassing the other components and see if it starts. Might also check the fuel pressure up system. Search FPU VSV.
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Old 09-27-2016, 06:09 PM
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hard to tell if the pump is going with the engine cranking, but i don't hear it prime when i give ignition power. ill get some help listening for it tomorrow. Ok cool, ill run a pressure test tomorrow as
well and get back! where would i search FPU and VSV? Thanks!

Last edited by 1990YotaRig; 09-27-2016 at 06:12 PM.
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