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Question

I have a 1990 Lincoln Continental with a 3.8 liter v 6. that has low voltage to the throttle postion sensor and I am wondering what could cause this. Engine constantly goed from low idle to about half throttle just setting still? Thanks for the help Don

Submitted: 441 days and 12 hours ago.
Category: Ford
Value: $9
Status: CLOSED
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Optional Information

1990 Lincoln Continental 3.8I

Already Tried:
I have changed the map sensor and the throttle positon sensor. I then got an up graded obd scanner and found that it was not te tps but low voltage to it. I am wondering if the mass air flow sensor could cause this or what other things could cause this problem of the engine just surging from from idle to about half throttle just setting there, or just idling to high in park. Thanks Don

Posted by Gary 441 days and 8 hours ago.

Info Request

Thanks for asking Just Answer.This vehicle has either a MAP sensor or a MAF sensor,it won`t have both.The MAP has a vacuum line going to it.The MAF would be connected between the air cleaner and the throttle body.Without knowing what the voltage at the TPS sensor is,it is hard to say if this is the problem.Let me know if you can give any more info or have other questions.

441 days and 3 hours ago.

Reply

Well this car does have a map sensor and I have taken the vaccum line off and the engine idles down. I go to put the line back on the sensor and the engine revs up. I ran the code scanner and it gave me a falt code of 63 which is low voltage to throttle position sensor. I do not know the exact reading yet. I need to check that. I can unhook the sensor that sets on top of the throttle body, that has a hole one on either side of throttle plate, and then take car down the road and while it still idles to high it does not jerk at highway speeds. I will try to get a voltage reading on the TPS in the morning. Thanks XXXXXXXXX

Accepted Answer

Let me know what happens.

Accept and feedback appreciated.

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Expert: Gary
Pos. Feedback: 100.0 %
Accepts: 
Answered: 9/8/2008

Ford Technician

35 years experience,20 of those years at the same Ford Dealership.Hold All Ford Certifications

440 days and 8 hours ago.

Reply

I got your email about accepting your answer on the 2nd email you sent after I sent you more info, but I can't find the answer to my question it is like part of email is missing. Thanks XXXXXXXXX

Posted by Gary 440 days and 7 hours ago.

Info Request

Did you get the voltage readings from the TP sensor.With the sensor connected there should be around 5 volts on one wire,then check between the other 2 wires.With the throttle closed there should be around 0.9 volts and should increase to about 4.5 volts as you open the throttle.Let me know what you have.

439 days and 10 hours ago.

Reply

I got the voltages and with the TP sensor connected bottom wire is 5.10 volts, middle wire is .85 with throttle closed, and 4.45 with throttle open top wire stays at .03 volts all the time. But as I was working on car I just decided to close off the throttle body with a plate and see if engine would still run, and it does with air intake completely closed off engine idles down and runs pretty good. I sprayed carb cleaner around intake and engine cuts out and trys to die. So I think it has vaccum leak too. Any help you could give me would be appreicated. I am going to also hit the accept button for all you have done to help me. I still dont know which sensor is bad. XXXXXXXXX

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