So I had an issue about 6 months ago with a high idle (about 3000 rpm) immediately on start-up. That was rectified by taking out and cleaning the IAC; life was good.
Now it idles fine on start-up, but after the engines warmed up a bit (5 minutes of running), the idle creeps up to about 1500 rpm, and stays there. Very consistent. I've cleaned the IAC again, and the connectors on both the IAC and TPS. Am I looking at cleaning the entire throttle body now? Is that a logical next step? Or is there something else I should be looking at first?
I would be putting a vacuum gauge on to see if it has a leak I think.
I then would be checking the TPS with a multimeter. It can be tested live for voltage levels with the engine off, but the key in run or unplugged with the ohm meter. For volts you would be looking at .2 to
4.8 I believe from closed to open.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail > So I had an issue about 6 months ago with a high idle (about 3000 rpm)
Does this seem to describe how I'm supposed to adjust/test the voltage?
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I have a1989 factory service manual and it says the following for manual trans application. On the back of the TPS harness connector the terminals are marked A, B, and C. While leaving it plugged in you will need to back probe the connector with a digital volt/ohm meter. ( you can stick the leads of the meter in the back of the plug where the wires enter without doing any damage). The sensor input voltage is read by inserting the negative lead in terminal B and positive lead in terminal A. Throttle should be completely closed and voltage should read about 5 volts. (record your reading) To check sensor output voltage, leave negative wire in back of terminal B, switch positive lead to terminal C. Again throttle is to be
completely closed. (record your reading) To check for proper TPS adjustment, divide the output voltage reading by the input voltage reading. The desired ratio is .825 to .835
(.830 desired). If necessary adjust TPS sensor until the correct ratio is obtained.
Cl> I would be putting a vacuum gauge on to see if it has a leak I think. >
Does this seem to describe how I'm supposed to adjust/test the voltage?
formatting link
Similar to this:
I have a1989 factory service manual and it says the following for manual trans application. On the back of the TPS harness connector the terminals are marked A, B, and C. While leaving it plugged in you will need to back probe the connector with a digital volt/ohm meter. ( you can stick the leads of the meter in the back of the plug where the wires enter without doing any damage). The sensor input voltage is read by inserting the negative lead in terminal B and positive lead in terminal A. Throttle should be completely closed and voltage should read about 5 volts. (record your reading) To check sensor output voltage, leave negative wire in back of terminal B, switch positive lead to terminal C. Again throttle is to be
completely closed. (record your reading) To check for proper TPS adjustment, divide the output voltage reading by the input voltage reading. The desired ratio is .825 to .835
(.830 desired). If necessary adjust TPS sensor until the correct ratio is obtained.
Cl> I would be putting a vacuum gauge on to see if it has a leak I think. >
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