2001 ETC Intermittent High Idle
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Northstar Engines and System Technical Discussion Discussion, 2001 ETC Intermittent High Idle in Cadillac Engine Technical Discussion; I experienced and seemed to have resolved an intermittent high idle problem. Occasionally the idle speed does't fall below 1200 ...
  1. #1
    ontarff is offline Cadillac Owners Member
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    2001 ETC Intermittent High Idle

    I experienced and seemed to have resolved an intermittent high idle problem. Occasionally the idle speed does't fall below 1200 rpm or higher causing a high coolant temperature. No DTC. I removed the idle air control (IAC) valve. It had a lot of soot on it. I cleaned the plunger, shaft and hole where it was mounted thoroughly with carburetor cleaner. I also cleaned the throttle body that wasn't too dirty. I wanted to replace the throttle position sensor (TPS), no DTC, but couldn't get to the retaining screws with a screw driver!

    Does anyone know how to remove the two Phillip's head retaining screws on the TPS? There is not enough clearance for a 90 degree screw driver to fit between the screw and a thick metal piece where the coolant crossover is mounted. The repair manual does not explain how to get to the screws other than removing the water pump belt cover.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2001 ETC Intermittent High Idle

    You'll probably have to remove the TB, but Usually the TB is the culprit. Hard to imagine it was clean, but the IAC valve wasn't.
    ontarff likes this.

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    LloydCFerguson is offline Cadillac Owners Member
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    I've found that servicing things on the drivers side of the engine usually requires removing other parts, that is just the way these cars are. Removing the waterpump belt cover is not that difficult and gives you the chance to check the belt and tensioner while you are in there.

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    basscatt's Avatar
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    Re: 2001 ETC Intermittent High Idle

    Quote Originally Posted by ontarff View Post
    I experienced and seemed to have resolved an intermittent high idle problem. Occasionally the idle speed does't fall below 1200 rpm or higher causing a high coolant temperature. No DTC. I removed the idle air control (IAC) valve. It had a lot of soot on it. I cleaned the plunger, shaft and hole where it was mounted thoroughly with carburetor cleaner. I also cleaned the throttle body that wasn't too dirty. I wanted to replace the throttle position sensor (TPS), no DTC, but couldn't get to the retaining screws with a screw driver!

    Does anyone know how to remove the two Phillip's head retaining screws on the TPS? There is not enough clearance for a 90 degree screw driver to fit between the screw and a thick metal piece where the coolant crossover is mounted. The repair manual does not explain how to get to the screws other than removing the water pump belt cover.
    --------------------------------
    I wanted to replace the throttle position sensor (TPS),
    no DTC, but couldn't get to the retaining screws with a screw driver!

    ASSUMING you pulled the codes correctly -
    if the TPS was defective - or not responding - or out of range -
    a code would be set -

    throwing parts at the car is RARELY the answer -
    and is definitely the most expensive method of repair -
    ontarff likes this.

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    ontarff is offline Cadillac Owners Member
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    Re: 2001 ETC Intermittent High Idle

    OK, I removed the throttle body to get to the TPS. I replaced the TPS. I was driving home today and AGAIN got a high idle problem. I don't know how to solve the problem now. I cleaned the thottle body, replaced the TPS and IAC and the problem still exists. Please advise

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    basscatt's Avatar
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    Re: 2001 ETC Intermittent High Idle

    Quote Originally Posted by ontarff View Post
    OK, I removed the throttle body to get to the TPS. I replaced the TPS. I was driving home today and AGAIN got a high idle problem. I don't know how to solve the problem now. I cleaned the thottle body, replaced the TPS and IAC and the problem still exists. Please advise
    -------------------------
    ASSUMING you checked that the gas pedal is not hanging up on the floor mat -
    and the throttle cable itself is not binding somewhere -
    and the throttle plate is not binding on anything -

    step #1 is ALWAYS check for Diagnostic Trouble Codes -

    if you don't know how - go here and read the ENTIRE post -

    http://www.cadillacforums.com/forums...odes-dtcs.html

    if you have any codes - post them here -
    ALONG WITH THEIR DEFINITIONS -
    ------------------
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    Re: 2001 ETC Intermittent High Idle

    Quote Originally Posted by ontarff View Post
    OK, I removed the throttle body to get to the TPS. I replaced the TPS. I was driving home today and AGAIN got a high idle problem. I don't know how to solve the problem now. I cleaned the thottle body, replaced the TPS and IAC and the problem still exists. Please advise
    Are the throttle cable connection points lubricated?

  9. #8
    ontarff is offline Cadillac Owners Member
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    Re: 2001 ETC Intermittent High Idle

    Quote Originally Posted by basscatt View Post
    -------------------------
    ASSUMING you checked that the gas pedal is not hanging up on the floor mat -
    and the throttle cable itself is not binding somewhere -
    and the throttle plate is not binding on anything -

    step #1 is ALWAYS check for Diagnostic Trouble Codes

    if you don't know how - go here and read the ENTIRE post -

    http://www.cadillacforums.com/forums...odes-dtcs.html

    if you have any codes - post them here -
    ALONG WITH THEIR DEFINITIONS -
    ------------------
    No DTCs, Problem occurs after a warm restart and engine comes up to normal operating temperature (at twelve o'clock).

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    ontarff is offline Cadillac Owners Member
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    Re: 2001 ETC Intermittent High Idle

    I haven't lubed them. I will and advise (with my fingers crossed!).

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    ontarff is offline Cadillac Owners Member
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    Re: 2001 ETC Intermittent High Idle

    I lubed the throttle cable attachment point and where the spring rubs next to the pulley. Could it be something wrong with the computer?

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    Re: 2001 ETC Intermittent High Idle

    Quote Originally Posted by ontarff View Post
    I lubed the throttle cable attachment point and where the spring rubs next to the pulley. Could it be something wrong with the computer?
    ---------------------
    Could it be something wrong with the computer?
    a computer or sensor malfunction should set a fault code -

  13. #12
    ontarff is offline Cadillac Owners Member
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    Question Idle problems - 2001 ETC

    2001 ETC with 69,000 miles. - I am having an intermittent high idle problem on a warm restart. Sometimes the idle RPM will not go back down below 1100. This causes a high coolant temp. (1-2 ticks). I cleaned the throttle body (not very dirty), throttle plate and replaced the IAC first, then installed a new TPS. Problem still occurs. Could it be the ECU? I noticed that since I replaced the TPS, on a cold start, initial RPM is 1100 for about 20 seconds and then drops to 900 but hunts a little between 850-950 when I put it in gear (R or D). 650 RPM when up to normal temp (gauge just a little past 12 o'clock). No coolant leaks, no DTCs.

  14. #13
    ontarff is offline Cadillac Owners Member
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    Re: 2001 ETC Intermittent High Idle

    Quote Originally Posted by basscatt View Post
    ---------------------
    Could it be something wrong with the computer?
    a computer or sensor malfunction should set a fault code -
    No DTCs.

  15. #14
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    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: Idle problems - 2001 ETC

    Your cold start fast idle sequence is correct, but not the "hunting" during the 900 rpm part.

    Vacuum leak ? An EVAP problem (vacuum leak) would set an emissions (P) code. Clean the IAC plunger ? I doubt the PCM is at fault.

    Even a high idle, if left alone for a few minutes (HVAC off), would cause the fans to turn on at 224 degrees - just less than one tick past the center position on the gauge. The engine then cools to 214, fans shut off, and the cycle begins. If the HVAC (A/C compressor operation set) was on, then fans run in SLOW all the time, so the engine should not heat much past the center mark, if at all.

    Study the stickys just above this thread - fans, gauges, cooling system operation.

  16. #15
    JoeTahoe is offline Cadillac Owners Fanatic
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    Re: Idle problems - 2001 ETC

    any engine codes. could be intake plenum is dry rotted and leaking

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