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Q: 92' V6 Toyota Pickup Hesitation at Low RPM on 1992 Toyota Pickup

Hello, I am having problems with my 92' Toyota Pickup. Its the V6 5spd Ext. Cab 4x4. It has always idled erratically. Usually in the winter it will surge and go up and down from 1800-1500 then if you depress the brake pedal it will go down to 1500-1300 range. In the summer it idles around 1000 sometimes lower. This is a minor concern, since it always ran fine I could care less if it idle crazy. But now it has started stall out at low rpm. Its almost as if the engine completely dies then starts back up. This will occur around 1500 and then after 2000 rpm it runs fine. Keep in mind this is while driving not sitting parked. It seems to get worse, there has been a few times that it actually died and would hardly start back up. I had to give it gas and keep revving it until the rpms where back above the 2000 range. I have replaced the plugs, wires, distributor cap, rotor, fuel filter and air filter. Also just took off the throttle body and completely cleaned it with throttle body cleaner. I also checked the code since the check engine is comes one occasionally. It read a code 22 which is a Water Temperature Sensor Signal -- Open or Short in Water Temp. Sensor Signal. I have no idea if that has anything to do with it?? Please help, any advice or input would be greatly appreciated!!
Thanks- Matt
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Sounds like your Yota's throttle position sensor has failed. I have a 92 4-runner, had the same problem, it wouldn't idle properly despite repeated adjustments to the screw. Now it idles perfectly. A new TPS will cost you $75, the trick is ADJUSTING it properly upon installation - or you'll create all NEW problems. Reccomend you pay a mechanic to do it, it's a real pain to replace because you simply can't get access to the two tiny screws that hold it in and allow it to be adjusted (it rotates about 15 degrees). If you do it yourself suggest you replace the two screws with allen heads so you can use a ball-headed allen driver at an angle instead of trying to come straight in, which is near impossible. Buy 3, plan on dropping one...

Your coolant temp sensor failure will affect your mpgs, and is worth fixing. Part is only $15. Check the old one with an ohm meter, should be about 2 ohms room temp, 1 ohm out of the freezer, 10 ohms under very hot water out of the sink. If the old one isn't failed, then check your wiring harness for damage.

You've probably already sold the truck by now but if so maybe this response will help another.
No, cold only rough idle suggests the coolant temp sensor. But take the snorkel off, completely off the car, from the air filter to the throttle body. Wash it in soapy water and inspect it for cracks out in the sunlight. I'll bet you find several, including right where it sits on the throttle body. I know, because EVERY one at the junkyard was like that. Air leaks will give you the problems you describe. A shop can "smoke" it for leaks or you can take the hose to the power brake booster and blow cigarette/cigar smoke into it yourself, another way to check for leaks. Check Youtube for "vacuum leak cigar"
temp sensor will directly effect how the motor runs. i think you should address it first. if the computer gets the wrong signal, it will run rich and lean and will cause all kinds of issues.
it is good you did the basics, now it is time to get a tech involved that is familiar with the system to identify the problem.

thnaks for using repairpal.

Thanks Roy do you think I should replace the temp sensor and go from there? Because you are right sometimes it will load up and run so rich you cant stand to be around it will its running
it is an easy try to do that. if it does not get any better, then you will need someone to check the wiring.
you dont have to reset the computer. on the obd 1 systems, the light will go out when the problem is fixed.

good luck

So I go to OReilly Auto Parts to pick up the Temp Sensor, and they end up giving me the temp SENDOR. They search for another brand it was the same thing. They ended up cleaning up my old sensor and found out it was crossed to a Beck/Arnley #158-0484. I have searched for that brand and part # and most places I find it shows the sensor is used in a the 2.4 22re motors. Would this be the right part I need to replace the sensor?
This might be helpful to some. I am a mechanic and own a 92 Toyota V6 3.0L 4X4. I had the same problem and replaced the TPC sensor, ignitor, coil, spark plugs, and coolant temp sensor with no luck. I figured out the problem and it cost me nothing. The mass airflow sensor, directly behind the air filter, has a door that opens and closes. This is held in with a pin. The pin came out three quarters of the way and was jamming the sensor, which was letting no air intake to the motor. You do not have to replace the mass air flow sensor. Take the screws out of the bottom and pop it apart. You will see the pin sticking out. Push it back in and put a dab of super glue to keep it in. Also check your fuel pressure. It should be between 38 and 40 pounds. If the fuel filter is clogged it can actually raise and lower the fuel pressure, causing it to bog down and even die. One more note, the 3.0L were designed to run on premium gas, not regular. Running regular gas will cause the vehicle to burn up fuel pumps, lose horse power, and worse gas mileage. If you have a K&N air filter, lightly oil it, or it will suck the oil into the throttle body.
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