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drose91865
Novice
Dec 5, 2011, 10:31 AM
Post #1 of 8
(7879 views)
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1993 toyota 4 runner v6
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I've been having trouble with my 93 4 runner, SE V6, automatic trans, it has 218,000+ on the odometer so I know it's tired.
Most of the time it runs fine but lately I have been losing power and it misses really bad with a warm or hot engine. Sometimes I have zero throttle response and then all of a sudden it catches and blasts off!!
I took out the thermostat in the summer due to some overheating issues/fixed some leaks and replaced radiator but did not put thermostat back in, I was thinking transmission because when it first started the missing and power loss was when it was cold and once the motor warmed it ran fine but then it started doing it all the time, more so when warmed up then when cold.
Like I said I can leave my house after not letting it warm up at all and it will drive fine and then go to pull away from a stoplight and it almost won't run and then at the next light it's fine again.
Any help or ideas would be greatly appreciated!!
Thanks in advance, Danny Rose
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 5, 2011, 10:38 AM
Post #2 of 8
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Re: 1993 toyota 4 runner v6
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Put the thermostat back in as all you have accomplished is making water/coolant flow too fast at water pump and overheating away from it confusing the whole engine and high risk of damage. Taking it out may make the gauge happy but not the engine!
T
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 5, 2011, 5:08 PM
Post #3 of 8
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Re: 1993 toyota 4 runner v6
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I have a 92 Toyota pickup with the 3.slow in it.
First thing you can try is seeing if there are any trouble codes in the ECU. There is a diagnosic connector under the hood. If you flip the cap there are a bunch of terminals. Underneath the cap is the label for the terminals in the connector. Take a jumper wire and jump TE1 to E1 and turn the ignition on. The check engine light will flash two digit trouble codes if there are any being stored.
Some other things that you can check are the vane air flow meter and the TPS. A lot of times the resistor card inside the vane air flow meter gets worn out inside and the vane wiper will hit a dead spot causing the computer to lean out the fuel going to the engine. You can check the vane air flow sensor with an ohm meter. The TPS works about the same as a vane sensor and can be checked with a ohm or volt meter also. The TPS is hard to get to, so it's better to make your checks at the ECU connector.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 5, 2011, 5:11 PM)
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drose91865
Novice
Dec 8, 2011, 6:56 AM
Post #4 of 8
(7801 views)
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Re: 1993 toyota 4 runner v6
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Thank you Tom!!
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drose91865
Novice
Dec 8, 2011, 6:56 AM
Post #5 of 8
(7800 views)
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Re: 1993 toyota 4 runner v6
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Thank you Discrete!!
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drose91865
Novice
Dec 19, 2011, 1:06 PM
Post #6 of 8
(7769 views)
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Re: 1993 toyota 4 runner v6
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I put in the new TPS and now it bucks/revs up and down when the throttle is pressed...It seemed to run fine while the TPS was unplugged other then me having to manually shift gears...That thing is a bitch to get to.
What to do next?
I also put a new mass air flow sensor in when I got it in January of this year.
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Discretesignals
Ultimate Carjunky
/ Moderator
Dec 19, 2011, 7:45 PM
Post #7 of 8
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Re: 1993 toyota 4 runner v6
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Did you check for any stored codes in the ECU? You may have a TPS code in memory since you had disconnected it. You may have to clear codes by disconnecting the battery and then recheck for any possible codes.
When you slap on a new TPS you have to make sure that it is adjusted correctly by using an ohm meter. The ECU doesn't have the capability of auto zeroing the sensor.
1. Loosen the two set screws that secure the Throttle Position Sensor (TPS) to the throttle housing. (DO NOT REMOVE THE SCREWS).
2. Disconnect the connector to the TPS and connect an Ohmmeter to terminals IDL and E2.
3. Insert a 0.62mm (0.024in.) feeler gauge between the throttle stop screw and stop lever.
4. Rotate the TPS counter-clockwise and slowly back clockwise until the Ohmmeter just looses continuity, (infinite ohms).
5. Secure the TPS with the two set screws.
6. Remove the feeler gauge and recheck TPS setting. ^ There should be continuity with a 0.50mm (0.020in.) feeler gauge inserted in the stop.
^ There should be NO continuity with a 0.77mm (0.030in.) feeler gauge inserted in the stop.
7. Remove the Ohmmeter and reconnect the TPS connector.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 19, 2011, 7:55 PM)
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drose91865
Novice
Dec 21, 2011, 6:25 PM
Post #8 of 8
(7746 views)
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Re: 1993 toyota 4 runner v6
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Thanks Discrete. I haven't check the codes yet. I'll work on it again this weekend.
Thank you again for all your help!!
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