03 DTS, Bad Code
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 03 DTS, Bad Code in Past Cadillac Vehicle Discussion; So,,, i cleaned TB did it exactly like i was shown. Worked perfectly from all you guys for like 2 ...
  1. #1
    monty_n_philly is offline Cadillac Owners Member
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    03 DTS, Bad Code

    So,,, i cleaned TB did it exactly like i was shown. Worked perfectly from all you guys for like 2 days. Then rough idle and started not just feeling right. So I then pulled codes (before you guys, i would have had no idea what i was doing) and I got P0174 and P0300. I understand that P0174 is a vacuum leak, but I dont know where from. The guy who helps me, told me to get a car stethscope and listen to leaks, but where? P0300 is for misfiring, but hope if P0174 gets fixed then P0300 might go away. Can someone help me on this? I am trying to get it done this weekend and really could use some help. Thanks

    Deno

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: 03 Deville DTS, Bad Code.. HELP....

    A vacuum leak will hisssssssssss at idle, thus the stethoscope trick - NAPA.

    The vacuum leak search - remove the engine cover. There are 3 or 4 rubber lines attached to the top and sides of the throttlebody - the smaller ones are vacuum sources for different engine controls and emissions devices. A broken rubber connector or plastic pipe is a vacuum leak - any of them may be replaced by a suitable length of rubber vacuum hose, proper size - from the Help! racks at parts stores.

    On the right (rear) cam cover there is a larger pipe - the dirty air pipe for the PCV system. This pipe goes directly to the intake manifold front (passenger end) tunnel. A leak there will set all sorts of codes.

    Your engine also has a manifold overpressurization valve on the intake manifold, but it's under the plenum on the rear (driver's) end of the manifold - you need to remove the entire intake to check it, but these new styles are not prone to leaks.

    Take the car to a large car parts store and ask for a code scan. Their scanner, as opposed to our built-in scanners, will give a P 030X code where X is the faulty cylinder - either fuel or spark.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 03 DTS, Bad Code

    On the 2000+ engines P0174 is usually accompanied by P0171 and is indicative of a ripped plenum duct (very common). If in fact you only have the one code it is for Fuel Trim System Lean Bank 2 . That's the front bank so you might start your search there. Another way to locate a vacuum leak is to pray Brakleen, carb or TB cleaner near any possible leak points (vacuum lines and fittings, manifold mounting etc) and listen for an RPM increase.

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    monty_n_philly is offline Cadillac Owners Member
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    Re: 03 DTS, Bad Code

    I am going to try the carb trick, but what i have read it seems to be that the penlum is probably bad, but I will know later and let you know where it goes. Once i get the cover off, where do i spray the carb/tb cleaner at?

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    Ranger's Avatar
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    Re: 03 DTS, Bad Code

    The plenum duct is the rubber coupler between the TB and the manifold. Spray at the bottom of it (6:00 position) and flex it while you spray (while idling of coarse).


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    monty_n_philly is offline Cadillac Owners Member
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    Re: 03 DTS, Bad Code

    I took of the cover and sprayed it, but did not get the 6 o'clock spray on it. i will try it today. is there a better way to get it at the 6 o'clock spray?

  8. #7
    monty_n_philly is offline Cadillac Owners Member
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    Re: 03 DTS, Bad Code

    Look at this Ranger, is this the code scanner you are referring to. I got the stethscope, it only has a rod at the end, I dont know how it will hear leaks..



    http://www.autozone.com/autozone/acc...questid=676350



    Quote Originally Posted by Ranger View Post
    On the 2000+ engines P0174 is usually accompanied by P0171 and is indicative of a ripped plenum duct (very common). If in fact you only have the one code it is for Fuel Trim System Lean Bank 2 . That's the front bank so you might start your search there. Another way to locate a vacuum leak is to pray Brakleen, carb or TB cleaner near any possible leak points (vacuum lines and fittings, manifold mounting etc) and listen for an RPM increase.

  9. #8
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    You should be able to remove the diaphragm that the rod is attached to, and use just the tubing.

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    monty_n_philly is offline Cadillac Owners Member
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    Re: 03 DTS, Bad Code

    ok thanks,, i will def try that when i get home... do i need to buy that scanner or just wait and see what happens next? From what I found, if i dont have P0171 and P0174 then it is not the Penlum, but I will try to spray bottom of Penlum when I get home.... I am trying to findout exactly what...
    Fuel Trim System Lean Bank 2 actually means and fix it, but i dont have a def answer on what it is and how to fix it....

    So what do you think the step by step process is?


    Quote Originally Posted by MoistCabbage View Post
    You should be able to remove the diaphragm that the rod is attached to, and use just the tubing.

  11. #10
    MoistCabbage's Avatar
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    The code means that bank 2 (the front row of cylinders) is running lean (too much air/not enough fuel).

    I hgve you a quick step by step for the carb cleaner test when I texted you. The process is kind of similar with the stethoscope, but instead of spraying things, you'll be passing the stethoscope over things. Remove the engine cover, and with the engine idling, trace all of the vacuum lines, and around the intake manifold and injectors with the stethoscope hose.

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    monty_n_philly is offline Cadillac Owners Member
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    Re: 03 DTS, Bad Code

    Ok, I got ya... i sent u a pic of the stethscope to make sure it was the right one.... i will be working on it in the next hour...

    Quote Originally Posted by MoistCabbage View Post
    The code means that bank 2 (the front row of cylinders) is running lean (too much air/not enough fuel).

    I hgve you a quick step by step for the carb cleaner test when I texted you. The process is kind of similar with the stethoscope, but instead of spraying things, you'll be passing the stethoscope over things. Remove the engine cover, and with the engine idling, trace all of the vacuum lines, and around the intake manifold and injectors with the stethoscope hose.

  13. #12
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    I haven't gotten a picture yet.

    I'm going out to dinner in a while, but you can text me if you get stuck.

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    monty_n_philly is offline Cadillac Owners Member
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    Re: 03 DTS, Bad Code

    Well I did exactly what you guys said.. I sprayed at the 6 o'clock and the car idle went crazy, I let it settle and sprayed it again and it stopped..... so im thinkin its the Penlum, correct? Best place to buy it???

  15. #14
    Ranger's Avatar
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    Re: 03 DTS, Bad Code

    No need to buy a scanner. Your car has one built in.

  16. #15
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    I'm in the same boat as you. Looks like Amazon or Rockauto is the best place to get it. Do some googling and you can find coupon codes for Rock.

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