4.1 Sputters and pops
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 13 of 13
HT4100 4.1, 4.5, 4.9 Discussion, 4.1 Sputters and pops in Cadillac Engine Technical Discussion; My 1985 FWB with the 4.1 Ht4100 sputters and pops, especially under exceleration. As I have said before, I know ...
  1. #1
    305Caddy's Avatar
    305Caddy is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood Brogham RWD
    Join Date
    Jun 2007
    Location
    Miami
    Age
    31
    Posts
    74

    4.1 Sputters and pops

    My 1985 FWB with the 4.1 Ht4100 sputters and pops, especially under exceleration. As I have said before, I know jack shit about this engine. Does any one know what would could be causing this?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    NickySantoro is offline Cadillac Owners Fanatic
    Automobile(s): 1993 Eldo 4.9 66K miles
    Join Date
    Nov 2005
    Location
    Nazi Jerky, libtard central
    Posts
    368

    Re: 4.1 Sputters and pops

    Your symptoms are typical of an engine in need of a tune-up to include plugs, wires, cap, rotor, etc. It may well be something else, but I'd start the diagnostic process there.

  4. #3
    noahsdad's Avatar
    noahsdad is offline Cadillac Owners Connoisseur
    Automobile(s): '87 SDV
    Join Date
    Jun 2005
    Location
    Michigan
    Age
    55
    Posts
    1,296

    Re: 4.1 Sputters and pops

    Always start by checking trouble codes. Symptoms like that could cost you a lot of time and money chasing ghosts. Your Cadillac will tell you where it hurts, most of the time.

  5. #4
    305Caddy's Avatar
    305Caddy is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood Brogham RWD
    Join Date
    Jun 2007
    Location
    Miami
    Age
    31
    Posts
    74
    Thread Starter

    Re: 4.1 Sputters and pops

    My trouble codes are 29, and 52.

  6. #5
    noahsdad's Avatar
    noahsdad is offline Cadillac Owners Connoisseur
    Automobile(s): '87 SDV
    Join Date
    Jun 2005
    Location
    Michigan
    Age
    55
    Posts
    1,296

    Re: 4.1 Sputters and pops

    e29=shorted 4th gear circuit
    e52=PCM memory reset (probably from replacing or disconnecting the battery)

    Neither one would cause your popping troubles. Does it run bad all the time, or just when it warms up? Is this a RWD full size or FWD c-body?

  7. #6
    305Caddy's Avatar
    305Caddy is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood Brogham RWD
    Join Date
    Jun 2007
    Location
    Miami
    Age
    31
    Posts
    74
    Thread Starter

    Re: 4.1 Sputters and pops

    The sputtering/popping will happen any time I accelerate, weather I just started her up or I have been driving for a while. It seems to be especially bad if im in 3rd or fourth gear and start to accelrate.

  8. #7
    305Caddy's Avatar
    305Caddy is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood Brogham RWD
    Join Date
    Jun 2007
    Location
    Miami
    Age
    31
    Posts
    74
    Thread Starter

    Re: 4.1 Sputters and pops

    1985 Fleetwood Brogham RWD

  9. #8
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
    Join Date
    Jun 2005
    Location
    Michigan
    Posts
    668

    Re: 4.1 Sputters and pops

    Check your timing. You could also have a collapsed valve lifter or flat cam.

  10. #9
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,943

    Re: 4.1 Sputters and pops

    More than likely a flat cam, but verify fuel pressure is at spec. Low pressure can cause it to run too lean at higher RPM's. then backfire thru the intake.

  11. #10
    305Caddy's Avatar
    305Caddy is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood Brogham RWD
    Join Date
    Jun 2007
    Location
    Miami
    Age
    31
    Posts
    74
    Thread Starter

    Re: 4.1 Sputters and pops

    Well I dont think it would be the cam, because it just all of a sudden started happening one day. I would be more suspicouise of the fuel system except it feels like it happening in only one of the cylinders. It feels like one of the cylinders on the driver side just isnt fireing wright.

    She needs a tune up any ways so Im gonna go ahead and replace the rotor, cap, incap-resistor, wires and plugs.
    Does any one knoe if this is an HEI setup?

  12. #11
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
    Join Date
    Jun 2005
    Location
    Michigan
    Posts
    668

    Re: 4.1 Sputters and pops

    Yes, it's an HEI setup. You have to transfer the coil from the old cap to the new one.

  13. #12
    caddeville's Avatar
    caddeville is offline Cadillac Owners Enthusiast
    Automobile(s): 1991 Deville / 1989 BMW 635csi
    Join Date
    Jan 2005
    Location
    British Columbia, CANADA
    Age
    24
    Posts
    896

    Re: 4.1 Sputters and pops

    I had the exact same problem on my 85 FWD fleetwood trned out to be a cupped lifter in #7 cylinder (cam ate lifter), i wasted my time and money witht he whoel igniton system, fuel press was fine. And yes mine happened out of the blue. I replaced the lfiters, ran good, btu i never checked pick up tube wether it was clogged or not, and my bearings discintigrated. Replaced motor and sold the car. car had 99,000 MILES on it, 159,000 KM's.

  14. #13
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,943

    Re: 4.1 Sputters and pops

    Yes this is an HEI. With no codes related, start with plug wires and plugs. Make sure all wires are routed correctly by the book. If routed incorrectly this engine will cross fire causing a miss. You only have 2 injectors on this engine so an injector is unlikely. If after the wires and plugs it still pops, then pull the valve covers to verify all rockers are fully pushing open the valves. Popping thru the intake on hard throttle is a sign of a flat cam or collasped lifter.

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