Throttle Body
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Northstar Engines and System Technical Discussion Discussion, Throttle Body in Cadillac Engine Technical Discussion; I took my '00 STS in to have a few things looked at, (all of which should be covered under ...
  1. #1
    tryn2befree is offline Cadillac Owners Member
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    Question Throttle Body

    I took my '00 STS in to have a few things looked at, (all of which should be covered under warranty, you would think...only having 33,400 mi.)one being a rough idle on startup and fluctuating idle at temp...What I got from the dealer was, "you need to have your throttle body cleaned" @ $150 I figure I could do it myself, so the question is:

    A.) is this an easy do-it-yourself task that can be completed with a can of carb cleaner? And, is it necessary to take the whole TB off and go over it with a toothbrush?

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    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
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    Re: Throttle Body

    Id recomment taking off the TB, but you can clean it pretty dectent on the car..... Just get a can of carb cleaner, and go nuts!!!! TB removal is easy also, just depends on what you want...... I wouldnt think at this mileage that its bad enough to need to take it off......

    Just open the throttle plate WOT (car off, obviously) and start wiping down with a soft brush and/or towel....

  4. #3
    Dubya is offline Cadillac Owners Fanatic
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    one thing, don't think elwesso was saying this, but don't just spray tb cleaner in there with the car on, im pretty sure that would run the MAF. that used to be the way to clean a carb. wet the towel down with the carb cleaner and wipe around in there so its all soiled up. wait a while and come back with a aggresive brush

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    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
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    Re: Throttle Body

    Actually, its a good idea to occasionally clean the MAF also.... Brake cleaner works best for that...... But no, you DONT wanna spray ANYTHING in there with the car on.... The MAF is a heated wire and if you spray aerosol in there you'll have a very icky fireworks show.....

    Id take off as much hardware as you could to get to the TB..... If i recall correctly its on the intake tube, so you could just take that off and your right at the TB......

  6. #5
    tryn2befree is offline Cadillac Owners Member
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    Arrow

    Yeah, I know about the MAF. I would definitely remove the intake hose etc, and then I was thinking of gett'n a can of the spray and dousing the TB - Is this all the dealers do?

  7. #6
    JJhomer83's Avatar
    JJhomer83 is offline Cadillac Owners Connoisseur
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    Re: Throttle Body

    Quote Originally Posted by elwesso
    Actually, its a good idea to occasionally clean the MAF also.... Brake cleaner works best for that...... But no, you DONT wanna spray ANYTHING in there with the car on.... The MAF is a heated wire and if you spray aerosol in there you'll have a very icky fireworks show.....

    Id take off as much hardware as you could to get to the TB..... If i recall correctly its on the intake tube, so you could just take that off and your right at the TB......
    what would happen if you spray tb cleaner with the car running??? any damage short or long term???

  8. #7
    elwesso's Avatar
    elwesso is offline Cadillac Owners Master
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    Re: Throttle Body

    Josh... On your car it woudlnt be a problem..... You just dont wanna spray anything upstream of the MAF..... Thats all......

    Its actually a good idea to clean things out every so often..... I am about due for another decarb here real soon......

    The dealers probably use an intake fogger... that is, a machine they hook it up to, and it goes in the intake tract, and sprays ionized solvents in there..... I doubt they do manual labor, but im not sure.......

  9. #8
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    Re: Throttle Body

    Quote Originally Posted by elwesso
    Josh... On your car it woudlnt be a problem..... You just dont wanna spray anything upstream of the MAF..... Thats all......

    Its actually a good idea to clean things out every so often..... I am about due for another decarb here real soon......

    The dealers probably use an intake fogger... that is, a machine they hook it up to, and it goes in the intake tract, and sprays ionized solvents in there..... I doubt they do manual labor, but im not sure.......
    sorry wes i need MAF defined and explained. (BTW wes is the smartest 17 yr old i know when it comes to cars) I am so fing jelous

    But does we know cell phones like i do (im such a geek)

  10. #9
    elwesso's Avatar
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    Re: Throttle Body

    No, I dont know cell phones, and all I care to know about them is how to make calls and change all the features.... Anything outside that I dont really care.....

    Anyway, the MAF (aka MAFS) is called the Mass Air Flow Sensor..... The MAF measures the intake air flow rate...... When air flows over the hot film element, it is cooled, and the heat reduction depends on the airflow.... Therefore, it is necessary to supply more voltage to the wire to maintain the temperature....... The ECU then detects the change in voltage and then translates this into a calculation of air into the plenum....

    But, your car doesnt have a MAF (Josh), so it doesnt matter..... Im pretty sure that the MAF on cadillacs (northstar/4.9) didnt come until OBDII (96)

  11. #10
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    Re: Throttle Body

    thanks wes

  12. #11
    97blkeldo is offline Cadillac Owners Member
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    Re: Throttle Body

    ive done the tb clean. i took the tb off the car though, to do this u must remove the air intake assembly. then remove the three harnesses, one on the mass air then 2 on the tb. unbolt the mass air. remove bolts for throttle cables, then remove the coolant lines that run through the tb(MAKE SURE U RELEASE THE PRESSURE B4 U DO THIS) then unbolt the tb.

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