2008 STS-V Problems post-engine swap - Page 2
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Cadillac STS-V Series Forum Discussion, 2008 STS-V Problems post-engine swap in Cadillac V-Series Forums; The additional lights did go out upon removing the scanner then starting. Ran the crank relearn last night. Still have ...
  1. #16
    Assault Pilot is offline Cadillac Owners Member
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    The additional lights did go out upon removing the scanner then starting.
    Ran the crank relearn last night. Still have random misfire code. Idles better, throttle seems to be better responding.
    But I don't have the time or money to continue if I have to open the engine again, so I'll wait till summer

  2. #17
    Ludacrisvp's Avatar
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    Assuming good plugs and coils?


    Sent from AutoGuide.com App

  3. #18
    CMNTMXR57 is offline Cadillac Owners Enthusiast
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    Re: 2008 STS-V Problems post-engine swap

    When you get a P0300, you should also get a P030x, the "X" being the cylinder(s) being affected by the misfire. If not, a good scan tool usually offers either both a current misfire section/chart/table and/or a history misfire section/chart/table, and you should be able to isolate it.

    As mentioned this is an interference engine, and if timing was off like you say... Potential bent valve from contact. But if that were the case, I would think you'd probably have quite a few bent ones.

    Some thoughts before digging into the engine;

    1) Coil Modules.
    2) Connectors for each coil module.
    3) Main ignition feed harness (that connects the coil modules). Ensure that all connections for #2 and #3 all pins are contacting. The harnesses don't offer a lot of slack, in them so it doesn't take much to pull a pin out enough to cause a poor connection
    4) Cracked plug.
    5) Are all injectors firing? Same thing as the ignition, check all electronic connectors, check that injectors are properly sealed within the fuel rail and engine, and the rubber "O" rings at each end are sealing properly. If so, then do an injector balance test (not sure if your scanner can do this). But essentially it involves connecting a pressure gauge to the end of the fuel rail, then commanding each injector to fire. With each firing, you should see the pressure drop consistently (not sure how much ours would drop it, but from doing this on other GM vehicles with a T2, it's usually 5 - 10 psi drop). Then when you find one that isn't in synch with the others, or not dropping at all, you've found a bad injector.
    6) No MAF, MAP, TPS, or other sensor related codes?
    7) Since your timing was off, and you were running the engine, it's quite possible that on a cold, open loop operation, running engine, extra fuel was dumped into the exhaust (I.E. Cats), and more or less, they're clogged and/or both pre-cat and post-cat HO2S's on the respective banks are fouled. This is a long shot, but I've seen it happen before. It is also a key when the vehicle can't get over say 40mph and can't rev past 3,500rpm.

    Just trying to throw out ideas.

    BTW, thanks for your service.

  4. #19
    Assault Pilot is offline Cadillac Owners Member
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    Re: 2008 STS-V Problems post-engine swap

    Thank you all for your feedback and thank you for the support!

    I am checking everything everyone is noting if I am able.

    All plugs are good
    I will check coils today

    CMNTMXR57

    Coils are on my list today to check
    I'll recheck connectors
    recheck main harness
    plugs were good when I put the engine in, could the run with off timing affected a plug?
    *on a side note the original timing was not off by much, for what its worth good or bad
    Need to research injector process you indicate
    No other related codes
    I'm leaning away from #7 due to: it easily revs up high, and I had it at 55mph doing a manual crankshaft variation relearn
    I redid the relearn when I got my SCT X3 back and operational.

    On that note, I did a preliminary data-log this morning:
    Cylinders #1, #3 and #5 are the misfire culprits.
    No misfires on any other cylinders

    Ok, I am reviewing playback now, this is interesting.

    The rate of misfire has a pattern

    At 15 seconds

    Cylinder #1 misfire count is 32
    Cylinder #3 misfire count is 15
    Cylinder #5 misfire count is 3

    at 30 seconds

    Cylinder #1 misfire count is 78
    Cylinder #3 misfire count is 57
    Cylinder #5 misfire count is 9

    at 45 seconds

    Cylinder #1 misfire count is 109
    Cylinder #3 misfire count is 78
    Cylinder #5 misfire count is 21

    I'm going to research datalogging and see how to monitor injector pulses and plug/coil firing if possible. And try to digest this pattern above.

    ----------

    What side is cylinder 1 on? Passengers side??



    P.S. My old helicopter unit in the 101st is doing the flyover for the Superbowl, my buddies are all bragging to me right now..be sure to watch for them!

  5. #20
    Assault Pilot is offline Cadillac Owners Member
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    Re: 2008 STS-V Problems post-engine swap

    It appears as if cyl #1 misfire is constant. Upon increase in RPMs, #3 and #5 misfires disappear or slow significantly.

    I'm going to check spark plug on #1, I will move the coil from #1 to see if misfire follows the coil.

  6. #21
    TimmyC is online now Cadillac Owners Connoisseur
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    Re: 2008 STS-V Problems post-engine swap

    Do a compression check on those cylinders. The odd numbers (bank 1) are on the passenger side. Isn't that the bank that had the cam timing problem?

  7. #22
    Assault Pilot is offline Cadillac Owners Member
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    Re: 2008 STS-V Problems post-engine swap

    WOW

    Found the problem. Pulled the #1 spark plug out for the compression test, spark plug was damaged and pinched. So I look down the hole. Appears there is a nail or something like that stuck in the exhaust valve. I inspected the engine when it arrived freight, I suspect the smallest of my three offspring may have poked this object into the exhaust port. I've found tools in my exhaust on my Jeep before, wrenches on strange orifices around the jeep as well...

    ....fan-f-ing-tastic. He's going to do pushups until I can afford another engine..or rebuild this brand new engine.

  8. #23
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    Re: 2008 STS-V Problems post-engine swap

    ouch...

  9. #24
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    Re: 2008 STS-V Problems post-engine swap

    Don't be to hard on the little guy. Sounds like he might be trying to fix dads car for him.
    Guy.Seminerio likes this.

  10. #25
    TimmyC is online now Cadillac Owners Connoisseur
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    Re: 2008 STS-V Problems post-engine swap

    The repair is going to be a lot of work but might not be that expensive. You might just need a few valves.

  11. #26
    carter's_sts is offline Cadillac Owners Connoisseur
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    That's crazy. That's just one of those crazy unexpected things. Kind of like the Broncos playing that badly.

    Sorry for your bad luck. I'm sure your kid meant no harm.

  12. #27
    Ludacrisvp's Avatar
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    Re: 2008 STS-V Problems post-engine swap

    Quote Originally Posted by carter's_sts View Post
    Kind of like the Broncos playing that badly.
    i'm sure all the seahawks fans expected the broncos to play that badly... did the broncos even show up or did they send in a group of stunt doubles?

    Hopefully the repair will be as simple as swapping out a few valves.

  13. #28
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    cadi509 is offline Cadillac Owners Connoisseur
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    Try living in Washington state and not being a Seahawks fan, bandwagon everywhere..... Hopefully you get the V up again ive been keeping up on your thread In case I ever have to do something similar

  14. #29
    boomys10 is offline Cadillac Owners Enthusiast
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    Re: 2008 STS-V Problems post-engine swap

    where did you get the engine from? im in the market for another one. thanks for info! also, if you would want to ship the old one to me, we might be able to work something out. message me!!

  15. #30
    Livyx is offline Cadillac Owners Member
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    Re: 2008 STS-V Problems post-engine swap

    Hey Boomy, you can get them on Pace Performance. http://paceperformance.com/i-6485095...er-engine.html
    But even at $9700 it is still a lot for an engine.

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