94 eldorado 4.6 - no codes - stumbling/chugging - about to give up
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 14 of 14
Northstar Engines and System Technical Discussion Discussion, 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up in Cadillac Engine Technical Discussion; Hey everyone, what a great resource. I'm frustrated, in fact, I haven't touched the car in a month. I'm not ...
  1. #1
    wiseman is offline Cadillac Owners Member
    Automobile(s): 94 Eldorado
    Join Date
    Jul 2009
    Age
    47
    Posts
    6

    94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    Hey everyone, what a great resource. I'm frustrated, in fact, I haven't touched the car in a month. I'm not the kind of guy to give up, but I'm out of ideas. I've been through most of this forum, many posts were similar to my condition, but I didn't find anything exactly.

    I'll start at the beginning. I bought the car several years ago. I thought I got a good deal. I drove it for a couple of weeks, and got stranded. It wouldn't start and fuel was coming out of the tailpipe.

    I was intimidated by the car, didn't have a book, and needed transportation. I had it towed to dealer in Ft. Wayne, they changed the fuel rail for $1800. I know they saw me coming. So basically I have in the car about what is worth if it were perfect.

    I got a factory service manual so I wasn't held hostage by the dealer any longer. The car started idiling high. I researched and checked, and went about cleaning the TB, and I replaced the ISC motor. I performed the learn procedure, and took the car for a test drive. About half way through it started chugging, and I limped home. Since then when I start it, it runs fine for a few seconds and then starts chugging agian. After about 5 minutes it will settle in to about a 750 RPM idle, but if I give it any gas it goes back into the chugging for another 5 minutes. Each time I give it some throttle, it repeats.

    I have been through the diagnostics, and the TPS seems to be working so does the ISC motor. As I said I get no codes. I put a pressure gauge on the fuel line, and it goes up to near 49 and settles in to above 40. It seems to stay there.

    I have not tried the fuel guage when the car is running, and I am hoping someone on this board can help me. Thanks.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    STSS is offline Cadillac Owners Enthusiast
    Automobile(s): '03 STS 122K, '01 STS 161K - 3/3/11
    Join Date
    Apr 2008
    Location
    Grafton, Ohio
    Age
    29
    Posts
    671

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    I really have no experience with this problem, but the first thing that came to mind was a plugged cat... not sure how to check...

  4. #3
    wiseman is offline Cadillac Owners Member
    Automobile(s): 94 Eldorado
    Join Date
    Jul 2009
    Age
    47
    Posts
    6

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    It's interesting you suggest that, because I left out the fact that during the chugging, I blew a hole in my cat. Nothing improved, but it is loud now. I was waiting on replacing it until I got the car running. I would have thought a plugged cat converter would throw codes. Thanks for the reply, and I'll look into it. I'm not sure how to check it either, but I put new mufflers on without putting a new cat converter on.

  5. #4
    93sevillests is offline Cadillac Owners Member
    Automobile(s): seville sts
    Join Date
    Jul 2009
    Age
    40
    Posts
    25

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    i too have came across this issue right now as we speak
    and the guy at the dealership looked at it and told me that
    the fuel rail and harness was bad and then he told me that both
    where no longer available and i would need to check the salvage
    yards or ebay for them
    let me replace mine first and i will let you know how the outcome is

  6. #5
    wiseman is offline Cadillac Owners Member
    Automobile(s): 94 Eldorado
    Join Date
    Jul 2009
    Age
    47
    Posts
    6

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    Thanks STS. Good luck. I'll stay tuned.

  7. #6
    therodman is offline Cadillac Owners Fanatic
    Automobile(s): 1981 Eldorado 1994 Seville STS
    Join Date
    Mar 2005
    Posts
    266

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    Wiseman, sounds to me like you could have a shorted fuel injector. I have a 94 Seville STS and had the water pump replaced a few years back. When I was driving it home fomr the repair shop, it started to chug really bad but alos had a lot of white smoke coming out the tail pipe. Turns out when they replaced a bolt in the area where the wire bundle runs into the intake for the injectors, they crimped a wire in that bundle. I would look about 8-10 inches down from where the wire bundke enters the intake alongside the TB and see if that wire bundke is pinched, move it while running and see if runs better.

    If that was or is it, it should throw a code.

    I also had a catalytic converter checked one time and the fella just torched a hole in the pipe forward of the converter and held a pressure gauge in the hole with the engine running, he also did it aft of the converter, quite simple.

    Good luck........

  8. #7
    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
    72,325

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    It wouldn't start and fuel was coming out of the tailpipe.
    If you have raw fuel running out of the tail pipe you are running extremely rich. See the tutorial in the Tech Tips section on how to check for a stuck open injector and a leaky FPR.

  9. #8
    wiseman is offline Cadillac Owners Member
    Automobile(s): 94 Eldorado
    Join Date
    Jul 2009
    Age
    47
    Posts
    6

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    Thanks Ranger, but that was historical perspective. That repair was done 18 months ago. I mentioned it in case it helped anyone understand my problem.
    Thanks

  10. #9
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 Eldorado, and a 99 ETC
    Join Date
    Sep 2004
    Location
    Hilo, Hawaii
    Age
    26
    Posts
    3,887

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    Are you getting a good strong spark?

  11. #10
    wiseman is offline Cadillac Owners Member
    Automobile(s): 94 Eldorado
    Join Date
    Jul 2009
    Age
    47
    Posts
    6

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    Yes my spark is good. Get this. I had the battery out for several days, and put it back in. The car runs like a top. But I get a PO83 code. High 24V output. What does that mean? I'll go through the tests tomorrow, but I hate dealing with those clips. They are so old and brittle, plus the plugs are so secure. I always worry about breaking a wire or a connection. I appreciate all the imput and I'll post my findings tomorrow.
    Thanks

  12. #11
    therodman is offline Cadillac Owners Fanatic
    Automobile(s): 1981 Eldorado 1994 Seville STS
    Join Date
    Mar 2005
    Posts
    266

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    P083 = Crankshaft to ignition module failure is what I come up with for that code. At least that's the code for a 94 Eldo, OBD1.

  13. #12
    Krashed989's Avatar
    Krashed989 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 Eldorado, and a 99 ETC
    Join Date
    Sep 2004
    Location
    Hilo, Hawaii
    Age
    26
    Posts
    3,887

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    24 volts?!?! Your regulator on your alternator may be bad. Running it with voltage that high is a good way to fry things. The voltage itself wont hurt much, but the amps that accompany it will bring a load of heat to lay havoc to everything.

  14. #13
    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Seville STS, 2000 Seville STS
    Join Date
    Jul 2007
    Age
    56
    Posts
    1,667

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    I think thats an ICM code. Equivalent to DTC P0371 IC 24X Reference CKT Too Many Pulses in OBDII cars


    Circuit Description
    This diagnostic test checks for more than forty nine 24X reference pulses between CAM pulses. However, the number of 24X pulses is allowed to vary between 47 and 49, as long as any variances toggle between too few pulses, and too many pulses. If two variances don't toggle, i.e. they both had 49 reference pulses and 8 4X reference pulses were received between CAM events, then DTC P0371 is set because too many 24X pulses were received.

    Conditions for Setting the DTC
    Test Conditions
    DTC P1376 not set.
    At least one CAM pulse received in the last 0.25 second.
    Engine speed between 496 and 3500 RPM.
    Number of CAM edges since key ON is 7 or greater.
    8 4X reference pulses seen between cam pulses.
    Failure Conditions
    More than 49 24X pulses seen between CAM pulses.

    OR

    The last 24X variance was 49 and current number of 24X pulses received is 49.

    Action Taken When the DTC Sets

    The PCM will illuminate the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
    The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records.
    Conditions for Clearing the MIL/DTC

    The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
    A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
    A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test.
    Use a scan tool to clear DTCs.
    Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation.
    Test Description
    Number(s) below refer to the step number(s) on the Diagnostic Table.

    Checking for possible cause of noise (extra 24X pulses) on the 24X spark reference circuit.

    If DTC resets, fault is still present. If DTC does not reset, fault has been eliminated.

    Checking for poor terminal contact at the IC module or PCM that may cause the DTC to set.

    Step
    Action
    Value(s)
    Yes
    No

    1
    Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
    --
    Go to Step 2
    Go to A Powertrain On Board Diagnostic (OBD) System Check

    2
    Check for possible sources of EMI (Electromagnetic Interference):

    Spark plug wires run along side the Ignition Control (IC) module.
    High power transmitters operating in the vicinity (such as mobile radios).
    Various testing equipment.
    A battery charger.
    Are any possible sources of EMI found?
    --
    Remove source of EMI
    Go to Step 3

    3
    Clear DTCs and retest.

    Does DTC P0371 reset?
    --
    Go to Step 4
    Fault not present

    4
    Check terminal contact at IC module connector C4 terminal A.
    Check terminal contact at PCM connector C2 terminal 5.
    Repair terminal contact if needed.
    Was terminal contact repaired?
    --
    Go to Powertrain Control Module Diagnosis for Verify Repair
    Go to Step 5

    5
    Replace the Ignition Control module. Refer to Ignition Control Module Replacement (Assembly) .

    Is the replacement complete?
    --
    Go to Powertrain Control Module Diagnosis for Verify Repair
    --


    http://www.cadillacforums.com/forums...p083-code.html

  15. #14
    wiseman is offline Cadillac Owners Member
    Automobile(s): 94 Eldorado
    Join Date
    Jul 2009
    Age
    47
    Posts
    6

    Re: 94 eldorado 4.6 - no codes - stumbling/chugging - about to give up

    Krashed, sorry about the type O. The wrong finger must have moved.
    Mark great information about this code. This code has flashed occasionally in the past, but went away. Does this fault explain the choppy running condition that mysteriously went away but threw no codes? Does my guess about needlessly performing idle learn procedure explain that condition?

    I appreciate all your imput, and will post as soon as I figure it out.

    Thanks

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