having a problem with my throttle kicker staying on all the time, causing a high idle. I took measurments on the TPS and found 1.5v at idle and 4.7 at WOT.

I have read the posts on this site and it looks like it should be a lot lower at idle. is this the reason for the kicker being and if so is it an adjustment or do I need to replace the TPS.

if i pull the plug on the kicker, the car backfires on decel wile cold but runs good warm?

car is a 86 T/A 305 with cc q-jet.

 

The throttle kicker is on all the time if the A/C (or defroster?) is switched on.
You made no mention of this in your post.

 

sorry

the car is an AC delete, so thats not a factor. I don't see how the TPS and kicker are related but the high volts on the TPS (1.5) at idle is the only thing I can find.

thanks for the help

 

O.K. I changed out the O2 sensor and that helped with the idle searching. Still have the high readings 1.5 @ idle on the TPS. I can't find a way to adjust the TPS from outside the carb. Is it adjustable?

my kicker is still on all the time, I just took the connector off for now.

 

If you lower your idle speed does the TPS reading go down?

 

There is a way to adjust it but it requires a special tool. There is a plug on the back edge of the accelerator pump arm "tower". Small- maybe 1/8" round. Pop that out and you'll see an adjustement screw head. Like I said, requires a special tool- i don't have the part number with me.

Do NOT adjust this until you have confirmed that your idle speed is correct and that the voltage will go below 1.5 as you slow the idle down further. Lots of times the TPS itself is bad and likes to "hang" at a certain voltage. Usually it'll read correctly at idle but will "top out" well below the 4.5V it should read at WOT. Yours seems to have the opposite problem, but the TPS could still be bad.

 

I tryed messing with the idle but the 1.5v to 4.5 stays the same. I still don't see the plug? do I need to remove the pump arm to access it?
Could the 1.5v be the reason for the kicker being on all the time, or is that a different issue.

thanks for the help.

 

I can not give you a correct answer, but I do know what I would do if my car had these symptoms.
The " throttle position sensor" is not really a "sensor". It is an electronic component known as a variable resistor (also called a rheostat, potentiometer or ("pot" ). All "pots" have 3 connections. The middle connection is called the "wiper", this is the part that moves (as the throttle is opened and closed). Of the other 2 connections, one is +5 volts and the other is ground (zero volts). Both of these voltages are supplied to by the ECM to the TPS.
The quickest way to test if TPS is tied to the Kicker would be to unplug the TPS and insert a jumper wire between ground and middle wire of the TPS plug. This will feed the ECM a signal of zero volts. If this causes the Kicker to shut off, then you have your answer.