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Thread: Another turbo boost problem and code p0236

  1. #11
    Join Date
    Apr 2017
    Posts
    25

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    Quote Originally Posted by grancito View Post
    You are having some luck, send some my way. Today in the city 60 Km from home, the GMC truck did it's first gear only tantrum, and had to drive home in first gear. It has not had the problem for 8 months, after replacing the ignition switch. Now it only has 2-3 shift solenoid code, instead of other times also 3-4 and lockup failures, all false codes. There is a bad connection somewhere, will have to experiment with jumper leads.
    During trying to figure out the problem with the boost system, I have a small dental file, pulled all the connectors apart and cleaned the female ends with the dental file, used an old points file to clean the male ends.
    Might be some corroded connections causing your trans to act up.
    I also used multiple jumper wires hooked to various components with back probing, using stick pins. I had the two multimeters setting in the cab and would pull over and switch wires, during the trouble shooting process. That removed doubts about if voltages from and into sensors was correct.
    2000 Chevrolet K3500 crew cab and long box, auto trans
    Relocated PMD W no. 9 resistor, gauge tower, boost, Pyro and trans temp. enhanced shift controller.
    Home made aeroquip oil cooler hoses.
    Added on Glow Plug Relay with manual push button along with the factory GP controller.
    3-1/2" exhaust with 4" tip. Straight through, no muffler and not too loud at all.

  2. #12
    Join Date
    Apr 2017
    Posts
    25

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    Here is a pic of the dental files. They can be obtained online or possibly a dentist office may have them.
    I used the blue one, notice the very thin end has been clipped. I did not want to risk it breaking off inside of a terminal.
    I shopped all over and could not find any other tool suitable for getting inside of the female terminals.
    IMG_3417.jpg
    2000 Chevrolet K3500 crew cab and long box, auto trans
    Relocated PMD W no. 9 resistor, gauge tower, boost, Pyro and trans temp. enhanced shift controller.
    Home made aeroquip oil cooler hoses.
    Added on Glow Plug Relay with manual push button along with the factory GP controller.
    3-1/2" exhaust with 4" tip. Straight through, no muffler and not too loud at all.

  3. #13
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,849

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    Thanks for that info. I tried moving the ECM plugs in and out on the road back, but that did not work as it did a year back. The 95 has quick ECM access, not the 94, but the 94 ECM is still sitting on the seat, so will plug it in for a test. A year back I pierced the wires at the transmission to test the solenoids and they were OK. One thing made easy, the code is posted as soon as the engine starts, so no need to drive to test any repair. Also it is OBD1 so I carry a plug jumper wire and can check codes from the SES light, strange that it does not come on when the code is posted.
    Last edited by grancito; 12-09-2017 at 04:12 AM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  4. #14
    Join Date
    Apr 2017
    Posts
    25

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    Quote Originally Posted by grancito View Post
    Thanks for that info. I tried moving the ECM plugs in and out on the road back, but that did not work as it did a year back. The 95 has quick ECM access, not the 94, but the 94 ECM is still sitting on the seat, so will plug it in for a test. A year back I pierced the wires at the transmission to test the solenoids and they were OK. One thing made easy, the code is posted as soon as the engine starts, so no need to drive to test any repair. Also it is OBD1 so I carry a plug jumper wire and can check codes from the SES light, strange that it does not come on when the code is posted.
    SES light does not come on when the code is set ?
    That could be a problem with the ECM.
    2000 Chevrolet K3500 crew cab and long box, auto trans
    Relocated PMD W no. 9 resistor, gauge tower, boost, Pyro and trans temp. enhanced shift controller.
    Home made aeroquip oil cooler hoses.
    Added on Glow Plug Relay with manual push button along with the factory GP controller.
    3-1/2" exhaust with 4" tip. Straight through, no muffler and not too loud at all.

  5. #15
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,849

    Default

    Quote Originally Posted by MrMarty51 View Post
    SES light does not come on when the code is set ?
    That could be a problem with the ECM.
    I should have used a body ground to transmission jumper lead first, to test grounding, but was feeling lazy, so just changed the ECM. That fixed it for now, so put the right PROM in it, to suit the diff ratio. I remember doing this a long time ago, and think that the problem came back.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  6. #16
    Join Date
    Apr 2017
    Posts
    25

    Default

    It`ll be interesting, keep us posted.
    2000 Chevrolet K3500 crew cab and long box, auto trans
    Relocated PMD W no. 9 resistor, gauge tower, boost, Pyro and trans temp. enhanced shift controller.
    Home made aeroquip oil cooler hoses.
    Added on Glow Plug Relay with manual push button along with the factory GP controller.
    3-1/2" exhaust with 4" tip. Straight through, no muffler and not too loud at all.

  7. #17
    Join Date
    Dec 2008
    Location
    Conesus N.Y.
    Posts
    113

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    I am a little confused with this setup. Did you go back to your vacumme waste gate operation or are you using your mechanical home made turbo master. I am hoping to increase my boost with a turbo master like yours and also lower my exhaust temp. Not sure what my boost is now and the truck likes to overheat on long uphill grades. If my exhaust temps are lower I am hoping temp will also drop. This may sound goofy but I wont know until I hookup a boost gauge.I've enjoyed listening to you guys on this subject as it is very interesting and may apply in my case. Some of my over heating has to do with the truck weighs 12000 lbs. The duromax fan and 80 deg thermostates help but still looking for more power and better fuel ecom (12mpg).
    I have a 1997 horton 4X4 ambulance converted into a motor home. New hot glow plugs, remote PMD and cooler and air induction kit. New duramax fan and 180 degree thermostates. I also own two 99 suburbans.

  8. #18
    Join Date
    Apr 2017
    Posts
    25

    Default

    Quote Originally Posted by quvia1 View Post
    I am a little confused with this setup. Did you go back to your vacumme waste gate operation or are you using your mechanical home made turbo master. I am hoping to increase my boost with a turbo master like yours and also lower my exhaust temp. Not sure what my boost is now and the truck likes to overheat on long uphill grades. If my exhaust temps are lower I am hoping temp will also drop. This may sound goofy but I wont know until I hookup a boost gauge.I've enjoyed listening to you guys on this subject as it is very interesting and may apply in my case. Some of my over heating has to do with the truck weighs 12000 lbs. The duromax fan and 80 deg thermostates help but still looking for more power and better fuel ecom (12mpg).
    Yes, the boost system is now back to the way the truck came from GM. I had many issues with the boost system, corroded connectors, bad boost solenoid then about 1/2 way through the diagnostic procedures the vacuum pump failed, then the new NAPA boost control solenoid failed, the the original Delco solenoid failed, ordered a new Delco solenoid and in the mean time took the NAPA solenoid back and exchanged it for another one that failed, three of those. I am now running the BWD solenoid and have the Delco unit for a backup. the BWD unit seems to be performing as it should.
    2000 Chevrolet K3500 crew cab and long box, auto trans
    Relocated PMD W no. 9 resistor, gauge tower, boost, Pyro and trans temp. enhanced shift controller.
    Home made aeroquip oil cooler hoses.
    Added on Glow Plug Relay with manual push button along with the factory GP controller.
    3-1/2" exhaust with 4" tip. Straight through, no muffler and not too loud at all.

  9. #19
    Join Date
    Dec 2008
    Location
    Conesus N.Y.
    Posts
    113

    Default

    Thanks. I will keep mine stock and stay away from the turbo master. I will hook up a boost gauge in spring and go from there.
    I have a 1997 horton 4X4 ambulance converted into a motor home. New hot glow plugs, remote PMD and cooler and air induction kit. New duramax fan and 180 degree thermostates. I also own two 99 suburbans.

  10. #20
    Join Date
    Apr 2017
    Posts
    25

    Default

    Quote Originally Posted by quvia1 View Post
    Thanks. I will keep mine stock and stay away from the turbo master. I will hook up a boost gauge in spring and go from there.
    Thats a good plan. I like to keep My units as close to stock as possible.
    The ECM controlled boost systems works better than a TM, no codes is set when the ECM does`nt see the proper boost and 11 pounds of boost is plenty on these engines.
    2000 Chevrolet K3500 crew cab and long box, auto trans
    Relocated PMD W no. 9 resistor, gauge tower, boost, Pyro and trans temp. enhanced shift controller.
    Home made aeroquip oil cooler hoses.
    Added on Glow Plug Relay with manual push button along with the factory GP controller.
    3-1/2" exhaust with 4" tip. Straight through, no muffler and not too loud at all.

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