Help with car running bad
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 16
RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, Help with car running bad in Past Cadillac Vehicle Discussion; Okay, I gave my car a tune up and the funny thing is it runs hella worst now then it ...
  1. #1
    Jonnylightning71 is offline Cadillac Owners Member
    Automobile(s): 1990 Caddilac Brougham Fleetwood
    Join Date
    Jan 2013
    Age
    22
    Posts
    9

    Help with car running bad

    Okay, I gave my car a tune up and the funny thing is it runs hella worst now then it did before the tune up. I think it is either the vaccum lines or the custom spark plug wires I put together. First off on the 1990 Caddilac Brougham 307 oldsmobile engine is there two vaccum lines that arent connected or do all vaccum lines suppose to be connected? If those two lines arent connected to anything it is definitely the spark plug wires. The vaccum diagrams I find for this car are so gd unreadible I cant make out half the things on there but these two vaccum lines I cannot find anything that goes to them. I gladly appreciate the help.

    ----------

    http://carphotos.cardomain.com/ride_...0075_large.jpg Okay on this damn diagram you see the two lines on the very bottom that one hose says from manifold? What the hell is that circle? The circle on the bottom left corner? If somebody could give me a link to a picture of what that represents that may be where the two hoses connect to.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    csbuckn is offline Cadillac Owners Master
    Automobile(s): 84 Coupe w/500
    Join Date
    Jan 2008
    Location
    Minneapolis
    Posts
    5,155

    Re: Help with car running bad

    Might be the timing/wire routing but probably the custom wires. Buy a spark plug tester and put it inline with the wires. Its a cheap tool and will tell you exactly which wire is not sparking. Plug any hoses with screws or something and run it again. I did custom wires and it was a detailed job so, if you arent 150% you got them right, I'd start their.

    Sven, is that your diagram?

  4. #3
    sven914 is offline Cadillac Owners Connoisseur
    Join Date
    Dec 2008
    Posts
    4,164

    Re: Help with car running bad

    Quote Originally Posted by Jonnylightning71 View Post
    http://carphotos.cardomain.com/ride_...0075_large.jpg Okay on this damn diagram you see the two lines on the very bottom that one hose says from manifold? What the hell is that circle? The circle on the bottom left corner? If somebody could give me a link to a picture of what that represents that may be where the two hoses connect to.
    On the passenger side of the engine compartment, mounted to the fender, there should be large foot-ball shaped vacuum canister with two vacuum ports.

    The one hose connects to a vacuum port located on the front of the intake manifold. I don't remember exactly where the manifold port is, but think it is located on the driver's side, at the very front of the intake manifold.

    The other hose connects to the Knock Solenoid, which should be located on the driver's side valve cover, and has a red electrical clip. The knock sensor has two ports; one that goes to the Idle Load Compensator (near the carburettor) and the other goes into a round SNS object.

    Here are some picture I've taken of my vacuum routing:






    As a side note: You may notice my hoses are color coded. I spent 4 years fighting vacuum leaking and a very messed up hose routing, where almost nothing was plugged in where it belonged, and a lot of things were disconnected. Eventually I got tired of it, replaced all of the hoses, and routed them all back to their factory locations. While replacing them, I marketed each one with a unique combination of three colors, so now I know exactly where each and everyone of them is supposed to be.

  5. #4
    brougham is offline Cadillac Owners Master
    Automobile(s): 1991 Cadillac Brougham D'Elegance 5.7 Litre
    Join Date
    Jun 2003
    Location
    Canada
    Posts
    5,508

    Re: Help with car running bad

    yes all vacuum lines need to be connected!! Since they aren't you have a vacuum leak and is very likely the cause of your problem.

  6. #5
    Jonnylightning71 is offline Cadillac Owners Member
    Automobile(s): 1990 Caddilac Brougham Fleetwood
    Join Date
    Jan 2013
    Age
    22
    Posts
    9

    Re: Help with car running bad

    I appreciate it guys. The advise here is all useful every one of you guys covered all of the questions.

  7. #6
    Jonnylightning71 is offline Cadillac Owners Member
    Automobile(s): 1990 Caddilac Brougham Fleetwood
    Join Date
    Jan 2013
    Age
    22
    Posts
    9

    Re: Help with car running bad

    Hey man I made a video I am sorry for sounding frustrated but the car turned off on me on the road. seven914 the vaccum hoses are the ones coming from the intake manifold and the knock solenoid. I think we have different engines because the football looking vaccum canister on the fender does not have two ports for those hoses
    to connect to. Here is a link to the video https://www.youtube.com/watch?v=TUNjN5JG8AQ

  8. #7
    sven914 is offline Cadillac Owners Connoisseur
    Join Date
    Dec 2008
    Posts
    4,164

    Re: Help with car running bad

    You can take it from me, the vacuum lines on this engine are source of infinite frustration. It took me several days to re-route all of my vacuum lines and replace them, and it's still all a clusterf**k of snakes that makes absolutely no sense.

    On that note, I was wrong about that football shaped vacuum canister; it only has one vacuum port. You need to splice into the hose to make it go to the knock solenoid and the manifold port.

    If you look at the first picture, of the hoses I posted, the hose marked with the red line is the one coming from the vacuum canister. If you look closely, you can see I have three splices in that hose; the first goes to the manifold port, the second to the Cruise Control servo, and the third goes to the Knock Solenoid. The hose goes beyond the third splice, wraps around the back of the carburettor and then connects to vacuum port on the Brake Booster (this connection is not shown in either my vacuum diagram or the one provided in the GM service literature).

    The vacuum diagram in my Service Manual shows that canister with two ports, so there may have been a special hose, which neither of our cars has any longer.

  9. #8
    csbuckn is offline Cadillac Owners Master
    Automobile(s): 84 Coupe w/500
    Join Date
    Jan 2008
    Location
    Minneapolis
    Posts
    5,155

    Re: Help with car running bad

    Pull a plug wire off the dizzy and start the car, it should run even worse. Now plug it back in and try another wire. When you pull a wire and the car doesnt run any worse, you have found the cylinder thats not sparking. The vacuum canister you are figuring out is an extra source of vacuum for when you turn on your accessories. The knock sensor is actually an anti-diesel solenoid used to make sure the car doesnt diesel when you turn it off. If you think the line is the issue, plug it with a screw to see if that makes it run better. Can you actually feel vacuum coming from the hose? Does it sound like its running on all cylinders when it does run or does it sound like its missing pretty bad? I just think you're going down the wrong road.

  10. #9
    Jonnylightning71 is offline Cadillac Owners Member
    Automobile(s): 1990 Caddilac Brougham Fleetwood
    Join Date
    Jan 2013
    Age
    22
    Posts
    9

    Re: Help with car running bad

    So the knock solenoid hose goes to the brake booster and where does the hose that comes from the intake manifold?

    ----------

    Once I get the car vaccum lines connected and if the car still runs bad I am going straight to the spark wires.

    ----------

    I want to know the stock set up. Where did those hoses come from originally? I took them off and for some reason I dont remember where they came from.

    ----------

    Guys were going to have to figure something out fast this car will not get over 30 miles per hour. Its 99 percent likely not the spark wires now. I cant have a car like this

  11. #10
    sven914 is offline Cadillac Owners Connoisseur
    Join Date
    Dec 2008
    Posts
    4,164

    Re: Help with car running bad

    Quote Originally Posted by Jonnylightning71 View Post
    So the knock solenoid hose goes to the brake booster and where does the hose that comes from the intake manifold?[COLOR="Silver"]
    No... The hose from the vacuum canister goes to the brake booster. The lines for knock solenoid and manifold are spliced into it.

  12. #11
    Jonnylightning71 is offline Cadillac Owners Member
    Automobile(s): 1990 Caddilac Brougham Fleetwood
    Join Date
    Jan 2013
    Age
    22
    Posts
    9

    Re: Help with car running bad

    Guys I used some pcv Ts and got them all spliced in there was a lot more Ts than your picture showed. I somehow had more hoses two more hoses. The car seemed to run better but I took it on that test drive and the same shit happened at 25 to 30 miles per hour the car would not go past and when you added more fuel it would begin to turn off. At idle you can rev the car pretty high but for some reason driving down the street car runs good till thirty. I just want to know would this be a vaccum problem still? Car ran perfect before I decided to give it a damn tune up. So I still hint it was vaccum still.

  13. #12
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
    Automobile(s): 1987 Brougham, 1974 Fleetwood Talisman, Volvo C70,
    Join Date
    Mar 2012
    Location
    Madison WI
    Age
    55
    Posts
    6,068

    Re: Help with car running bad

    Have we considered fuel yet? Sound like what happened on my 1982 when the tank sock/filter was filling up with junk.

  14. #13
    sven914 is offline Cadillac Owners Connoisseur
    Join Date
    Dec 2008
    Posts
    4,164

    Re: Help with car running bad

    Have you replace all of the hoses?

    You can have everything routed 100% correct, with everything going to right places, but if the hoses are dry-rotted or have a small pin hole, the car is going to run like crap. If the hoses were old, and you had to move one or even just stretch it to get it out of your way, it can cause a serious vacuum leak.

    Most parts stores sell hose by the foot, and when I replaced mine, I got 20ft of it for $5.00. All of the main hoses are the same size, so you don't need to worry about mixing and matching.

  15. #14
    csbuckn is offline Cadillac Owners Master
    Automobile(s): 84 Coupe w/500
    Join Date
    Jan 2008
    Location
    Minneapolis
    Posts
    5,155

    Re: Help with car running bad

    Fuel is another good place to look along with timing. Wires ran correctly or something being pinched by a valve cover. Almost sounds like the advance is not working correctly. Not sure how the dizzy advances with the CCCarbs but it would run good with no load and run bad under load if the advance werent working correctly. Cap on nice and tight?

  16. #15
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
    Automobile(s): 1987 Brougham, 1974 Fleetwood Talisman, Volvo C70,
    Join Date
    Mar 2012
    Location
    Madison WI
    Age
    55
    Posts
    6,068

    Re: Help with car running bad

    I don't know if they change from the 82 I had but with mine it would run great and as time passed and demand increased with speed particulates would build up on the tank sock until it barely ran or stalled out. It would sit for 20 minutes, the junk would fall off and back into the tank, and then the cycle would start over again.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting