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HT4100 4.1, 4.5, 4.9 Discussion, Engine Swap Process in Cadillac Engine Technical Discussion; You're right the pulley bolts weren't torqued correctly so I had to replace the pulley. That was very hard to ...
  1. #61
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    Re: Engine Swap Process

    You're right the pulley bolts weren't torqued correctly so I had to replace the pulley. That was very hard to get today but a little parts place was able to get it. Used medium thread locker and buttoned everything up now it runs even better and the rough idle was cut in half.

    Thank god that wasn't anything major. Thanks for your guys help!

  2. #62
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    Re: Engine Swap Process

    I guess it never ends...Today service engine soon light came on...I ran the codes and got E31 and E49. I know the one is for MAP sensor...I'm sure these codes are related.

  3. #63
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    Re: Engine Swap Process

    http://www.cadillacforums.com/forums...x-engines.html

    E31 - Shorted MAP Sensor Signal
    E49 - A.I.R. Control Problem

    I would test the wires for those per whatever instructions are in the FSM. Might have a pinched wire bundle or a loose connection somewhere.

  4. #64
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    Re: Engine Swap Process

    Quote Originally Posted by ehall View Post
    http://www.cadillacforums.com/forums...x-engines.html

    E31 - Shorted MAP Sensor Signal
    E49 - A.I.R. Control Problem

    I would test the wires for those per whatever instructions are in the FSM. Might have a pinched wire bundle or a loose connection somewhere.
    I cleared the codes and drove for a little so no new codes yet...I'm not getting good mpgs around town(around 10)...highway seems fine(20 to 28). My mechanic mentioned that he thought my cat might be bad...I'm sure these are related. I'm gonna check all connections...is the air system the diverter valve on the passenger side rear on top of the engine?

    Here are some pictures I took after checking for vaccum leaks. I noticed that the sensor attached the back bottom of the map sensor bracket has 2 nipples on it and I only see 1 vaccum hose connected. See photo #5.

    http://s1094.photobucket.com/albums/...Vaccum%20Leak/

    I also sprayed some throttle body cleaner around where the base of the air cleaner meets the PFI and the liquid gets sucked into the bottom of the air cleaner and RPM changes.

  5. #65
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    Re: Engine Swap Process

    Quote Originally Posted by Cristofo View Post
    is the air system the diverter valve on the passenger side rear on top of the engine?
    On my 4.1 there is a tangle of 1" hoses on the top rear passenger area, and the diverter valve is somewhere in there. The FSM describes test procedures that are useful for learning about it.

    Here are some pictures I took after checking for vaccum leaks. I noticed that the sensor attached the back bottom of the map sensor bracket has 2 nipples on it and I only see 1 vaccum hose connected. See photo #5.
    Hard to tell from that angle but that looks like the EGR solenoid blow-off port. When the EGR is turned off the system has to relieve the vacuum in order for the diaphragm to relax, so the solenoid has an exhaust port.

    I also sprayed some throttle body cleaner around where the base of the air cleaner meets the PFI and the liquid gets sucked into the bottom of the air cleaner and RPM changes.
    That doesn't sound right

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    Re: Engine Swap Process

    I'm going to either try to buy an intake gasket or make one and see if that stops the leak at the base of the intake.

    UPDATE: I removed the air cleaner assembly again and carefully looked how it was seating on the PFI unit and the way the thermostat clamp was positioned it wasnt allowing the air cleaner to sit flush. I moved the clamp out of the way and re-tightened. It started much quicker and sounded better at idle. Next test is to drive it.

  7. #67
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    Re: Engine Swap Process

    if you had a big enough o ring it would work.

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    Re: Engine Swap Process

    by the way you guys have been awesome! Thanks!

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    Re: Engine Swap Process

    I ran the on board tests and want to post my results. I dont have a FSM so I understand these kinds of questions get redundant, but I appreciate any help.

    I did the test twice, 1 time engine off, 1 time engine running. The numbers in () are with engine on.

    P01 - 3.7 (.5)
    P02 - 101 (46)
    P03 - 101 (101)
    P04 - 101 (98)
    P05 - 82 (90)
    P06 - 0 (18-19) fluctuating
    P07 - .0 (13.3)
    P08 - 0 (58-63) fluctuating
    P09 - 0 (0)
    P12 - .0 (5.3-5.5) fluctuating
    P14 - .07 (.54-.63) fluctuating
    P16 - 0 (8-13) fluctuating
    P18 - 128 (130)
    P20 - 128 (115)
    P21 - 22 (22)
    P22 - 00 (00)
    P23 - 10 (10)
    P24 - 40 (42)
    P25 -360 (360)

    Im sure these numbers could tell me alot if I knew what they are and what they should be...No FSM = Not much help...

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  11. #71
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    Re: Engine Swap Process

    Thanks, these are alot cheaper than the ones I saw for $105

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    Re: Engine Swap Process

    Quote Originally Posted by Cristofo View Post
    I ran the on board tests and want to post my results. I dont have a FSM so I understand these kinds of questions get redundant, but I appreciate any help.

    I did the test twice, 1 time engine off, 1 time engine running. The numbers in () are with engine on.

    P01 - 3.7 (.5) - TPS position
    P02 - 101 (46)
    P03 - 101 (101)
    P04 - 101 (98)
    P05 - 82 (90)
    P06 - 0 (18-19) fluctuating
    P07 - .0 (13.3) - Battery volts
    P08 - 0 (58-63) fluctuating - Engine RPM
    P09 - 0 (0) - Speed
    P12 - .0 (5.3-5.5) fluctuating - Injector pulse length
    P14 - .07 (.54-.63) fluctuating - O2 sensor voltage
    P16 - 0 (8-13) fluctuating - O2 sensor cross counts
    P18 - 128 (130)
    P20 - 128 (115)
    P21 - 22 (22)
    P22 - 00 (00)
    P23 - 10 (10)
    P24 - 40 (42)
    P25 -360 (360)

    Im sure these numbers could tell me alot if I knew what they are and what they should be...No FSM = Not much help...
    I added to the ones that I know. Not sure about the rest. P02-P06 are all various sensor readings like the MAP, coolant temp, air temp, etc. I'm not sure which is which, however.

  13. #73
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    Re: Engine Swap Process

    Quote Originally Posted by drewsdeville View Post
    I added to the ones that I know. Not sure about the rest. P02-P06 are all various sensor readings like the MAP, coolant temp, air temp, etc. I'm not sure which is which, however.
    Thanks Drew...I won't get my fsm for about a week I got one for less than 25 shipped. I actually ran them again with slightly different results. I just want to get rid of this rough idle. My Mpgs are way down.

  14. #74
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    Re: Engine Swap Process

    Man! Everyday its something new...my heat has been working fine but tonight when i tried to use it, it was blowing out cool. It was fine earlier today. Seems like this heart transplant is not taking very well. So frustrated.

  15. #75
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    Re: Engine Swap Process

    Quote Originally Posted by Cristofo View Post
    Man! Everyday its something new...my heat has been working fine but tonight when i tried to use it, it was blowing out cool. It was fine earlier today. Seems like this heart transplant is not taking very well. So frustrated.
    Update: I burped the system and finally got the heat back. I also replaced the Spark Plug wires and before driving it, idle sounds alot better. I hope this puts an end to my rough idle.

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