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Thread: replaced throttle position sensor

  1. #1
    Join Date
    Nov 2007
    Location
    San Jose
    Age
    56
    Posts
    2,541

    replaced throttle position sensor

    I had noticed the throttle seemed a little jumpy every evening when I pulled the car into the garage after work, or just idling through a parking lot. A slight nudge of the pedal seemed to often produce a several hundred RPM flare of the engine no matter how gentle I was.

    It wasn't that big a deal, but I started to realize something wasn't quite right. I thought about the idle air control, but I knew the engine had no trouble settling down to the correct idle speed under various circumstances; cold start, air conditioner on/off, or rolling up to a stop sign.

    So I guessed throttle position sensor. It is a mechanical potentiometer and these are known to wear. I could have ohmed it out, but I am too lazy and I do believe in changing wear items prophylactically (just for you, Zack ).

    Put it in a couple days ago along with new hood struts. Took about 15 minutes all told including cleaning the IAC, which has to come off anyway. $40 from Tasca parts plus $25/each for the struts. I disconnected the battery to make sure the PCM re-learned the sensor resistance. No more jumpy gas pedal. A minor detail, but it was a nice improvement to slow speed drivability.
    Lifespeed

    2004 Silver Birch Marauder 130K miles
    Wilwood Aero6 F, NMDP R brakes, Penske 7500DA shocks, Hypercoil 600lbs F and Grand Marquis R air springs, Addco tubular sway bars, Metco control & Watts, 31 sp axles, Stainless Works cat-back exhaust, Lidio tune, American Racing AR883 9.3" 50mm F 10" 59mm R 20" wheels, Pirelli P-Zero 265/35-20, 275/40-20 tires

    Coming soon: Livernois 5.0L stroker, ADTR/Vortech V2 intercooled SC, Silverfox trans and Circle D converter

  2. #2
    Join Date
    Oct 2010
    Location
    4 miles from insanity and 2ft from broke!
    Posts
    9,559
    Cool! But what's up with the 9"??????
    04 MERCURY MARAUDER build date:02/11/04
    ITS ALIVE !!!!!!!!

    STAY TUNED!!!!!!!!!!

    **WHIPPLE 4.0L CRUSHER!**0000 (FOR NOW) RWHP

    VISIT MY GARAGE FOR A FULL LIST OF MODS

  3. #3
    Join Date
    Nov 2007
    Location
    San Jose
    Age
    56
    Posts
    2,541
    Quote Originally Posted by MOTOWN View Post
    Cool! But what's up with the 9"??????
    I am working with the fabricator to encourage faster progress. They are good, but busy and a bit slow.
    Lifespeed

    2004 Silver Birch Marauder 130K miles
    Wilwood Aero6 F, NMDP R brakes, Penske 7500DA shocks, Hypercoil 600lbs F and Grand Marquis R air springs, Addco tubular sway bars, Metco control & Watts, 31 sp axles, Stainless Works cat-back exhaust, Lidio tune, American Racing AR883 9.3" 50mm F 10" 59mm R 20" wheels, Pirelli P-Zero 265/35-20, 275/40-20 tires

    Coming soon: Livernois 5.0L stroker, ADTR/Vortech V2 intercooled SC, Silverfox trans and Circle D converter

  4. #4
    Join Date
    Aug 2012
    Location
    Kansas City
    Age
    43
    Posts
    2,951
    The new hood struts fixed your problem. True story.
    Neil
    2003 Mercury Marauder - DBP/DC
    2003 Mercury Marauder - BLK/DC
    2003 Mercury Marauder - SB/LF
    2004 Mercury Marauder - DTR/LF
    1964 Mercury Marauder - BLK/BLK

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