92 Cadillac Deville 4.9 Intermediate surge issues when accelerating
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
Results 1 to 15 of 15
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating in Past Cadillac Vehicle Discussion; Purchased this car back in mid February with just a little over 80 thousand miles on it. Car ran great ...
  1. #1
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Purchased this car back in mid February with just a little over 80 thousand miles on it. Car ran great until about three weeks ago. It started running rough at idle, and I noticed sometimes when you get into the throttle to pass it would surge until you let off the gas a little. Diagnostics said E41, so I replaced the pickup module in the distributor and the car today ran amazingly smooth on my way to work, about a 70 mile commute. On my way home, the surge came back, but this time worse than normal. If I accelerated above 50 it would surge badly, so I started to limp it home. About a mile from the house I couldn't keep it above 10mph, then it stalled and quit running. I turned the key, restarted the car and for maybe a mile, it ran like there was no issues, then did it again. While it was running badly, I put the car in diagnostic mode while driving and it gave me an E70 error. But now that its sitting in the driveway, I have no errors. E70 is TPS, does this sound like something that would cause all the above?

    After the car sat for a while, I went out and pulled the line off the fuel filter and let the pump push fuel through the filter and into a gas jug, it pumps really good, so it may not be the fuel pump.
    I took it another ride, and it ran great for about 7 or 8 miles, then started surging again when I got aggressive on the gas. I've also loosened the gas cap with no luck on the issue.

    By surge, when I get aggressive on the gas pedal it feels like I'm pumping the pedal, or maybe the gas is start/stooping for half a second. Almost jerky like. Any ideas?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
    Automobile(s): 1993 Coupe Deville 2006 XLR Infrared, Ebony
    Join Date
    Feb 2010
    Location
    Orange County, CA
    Age
    60
    Posts
    2,465

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    What did the harness connectors look like when you replaced the module?

  4. #3
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Not bad, they appeared to be in really good shape. No corrosion, nice tight fits.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    72,236

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Might get a fuel pressure reading and check it under the conditions that cause the problem.

  6. #5
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Took it for another test ride tonight with an ODB scanner in live mode. Watched the TPS readings. Seemed to be .72 to 4.89 volts on the range, no fluctuations during the studder. Still has me puzzled, will look into some way to measure fuel pressure while driving, that might be kinda hard to do. the ODB only registers fuel pump volts, they stayed at 12.9 volts.

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    72,236

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    All you need is a fuel pressure gauge with a long enough hose to tape to the windshield. Most seem to come with short hoses. I spliced a piece into mine to lengthen it. The other option is to replace it with an old R12 refrigerant gauge hose. The fittings are the same, it just screws on.

  8. #7
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Ok, today I stuck a fuel pressure gauge on it, was able to tape it to the windshield. When getting on the accelerator under load at higher speeds, the fuel pressure drops to 10 and in a few cases 7, at which it would studder.

    Possible bad fuel pump? I've replaced the fuel filter, and have a good visual on all the fuel lines, no kinks or leaks. The fuel pressure regulator is not leaking gas into its vacuum port, or at least that I can tell. Removing the vacuum line from the regulator causes the pressure at idle to raise about 10 psi, so I assume the regulator is ok?

  9. #8
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    20,362
    Weak pump.

  10. #9
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
    Automobile(s): 1993 Coupe Deville 2006 XLR Infrared, Ebony
    Join Date
    Feb 2010
    Location
    Orange County, CA
    Age
    60
    Posts
    2,465

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Very weak pressure. Correct pressure should read with engine off key on between 40 and 50 psi.

  11. #10
    onecool is offline Cadillac Owners Fanatic
    Automobile(s): Deville
    Join Date
    Dec 2005
    Posts
    261
    Do what ranger and others saying weak fuel pump, mine did the same thing but at 10 miles mark it would act up.

  12. #11
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Dropped the fuel tank and pulled out the fuel pump. Inside the tank I can see the plastic baffles have broken into many pieces and are just floating around. Also I see tons of rust laying in the bottom of the tank. So I ordered a new pump, new gas tank and another new filter. All should arrive Friday, hopefully I can drive it again with confidence.

  13. #12
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    Update:

    New Gas Tank, Pump and Filter installed, car is running great. Was a weak pump for sure! Thanks Folks!!!

  14. #13
    calvin ar is offline Cadillac Owners Fanatic
    Automobile(s): 1991 devill
    Join Date
    Sep 2012
    Age
    33
    Posts
    116

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    did your new pump give you proper fuel level reading?

    if it did what kind did you get i have gone through 3 and they all work at first 200 miles latter they stop.

  15. #14
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    I bought a Bosch (RK-E8235-BSH), I'm getting about 45psi at idle with the regulator vacuum line pulled. My commute to and from work totals 124 miles a day, I sure hope I get more than 200 miles.

  16. #15
    ibdilbert is offline Cadillac Owners Member
    Automobile(s): 92 DeVille
    Join Date
    Feb 2013
    Age
    36
    Posts
    23

    Re: 92 Cadillac Deville 4.9 Intermediate surge issues when accelerating

    UPDATE: 627 miles on it this week with no issues. I'm considering the issue fixed.

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