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Thread: Another turbo boost problem and code p0236

  1. #1
    Join Date
    Apr 2017
    Posts
    25

    Default Another turbo boost problem and code p0236

    2000 Chevy, K3500, automatic transmission.
    How to begin ?
    I used a hand held bead blaster to clean the pin terminals in the weather pack connector for the turbo boost sensor, so I know that they are clean.
    After driving for about three or four miles, Signal voltage from the Turbo boost sensor falls while pulling a hill.
    It will be doing just fine, boost as high as seven pounds and voltages running three plus and pressing the accel pedal will go into the four volt range. Then, all of a sudden, the boost turns to 0 pounds and the voltage from the center signal wire will drop to 2.15, then occasionally bounce up, down and just sort of carries on.
    while the signal voltage is fluctuating, the reference voltage stays at 5.5 to 5.7 volts.
    I replaced the boost sensor with a BWD brand of sensor as it was the only brand available locally, got the same results with the new one.
    When it first started happening, I checked the vacuum at the solenoid valve, and voltage too, thinking that was the problem, replaced the solenoid valve as I had a new one setting here.
    If anyone could help Me out here, it would be greatly appreciated.
    Thank You
    Martin
    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. #2
    Join Date
    Apr 2017
    Posts
    25

    Default

    One thing I forgot about.
    There are three electrical terminal connectors behind the fuel filter, in the engines valley.
    I pulled the connectors from their retainers, pulled them apart, used the bead blaster and cleaned all six terminals. Put it back together and went for another test drive.
    And now, ECM is happy, Boost Sensor is happy, turbo is happy, truck is happy and so am I.
    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. #3
    Join Date
    Apr 2017
    Posts
    25

    Default

    The boost system is working a lot better but not yet fail proof.
    My plan is this coming winter to pull the engine, reseal, main and rod bearings and oil pump.
    While the engine is out, i`m going to dismantle the weather pack connectors, clean them all thoroughly and tighten the up a bit, then reassemble with some real nice corrosion preventive salve that I have.
    In the mean time, I made a bracket from some scrap in My iron pile, built it to very closely resemble the bracket that the vacuum actuator is mounted to, then, following some instruction I seen on the internet, used a no. 49 compression spring and built a manual waste gate controller.
    It seems to work quite well. I now have it set so max boost will be at about 8 pounds of boost.
    I`m going to gradually increase it until it hits ten pounds, then, wait until i am pulling a load and see where it rises to.
    Here is a pic. of the home made unit.
    IMG_3219.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.

  4. #4
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,842

    Default

    The mechanical waste gate control is good, but it drops my mpg by one mile, boost is too high at low throttle, 3 1/2 psi instead of 1 1/2 at 60 mph.
    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.

  5. #5
    Join Date
    Apr 2017
    Posts
    25

    Default

    Quote Originally Posted by grancito View Post
    The mechanical waste gate control is good, but it drops my mpg by one mile, boost is too high at low throttle, 3 1/2 psi instead of 1 1/2 at 60 mph.
    Yeah, I was hoping it would help the mileage, now getting 16 to the gallon.
    Wifey and I was going to church this morning, driving about 78 mph, boost was about 5 pounds. Pulling the hills it would hit 7.
    After church, before coming home, I gave the nuts four full turns down. Pulling the first long hill, it was pushing about 12 pounds, after that the highest it went was to ten, briefly. I`ll back the nuts off two full turns and call it good.
    Now the SES light is lit up. LOL
    A friend has an auto repair shop. He has a OTC Genesis scanner. I hope His scanner will be able to read the timing, I`m wanting to get it checked but I dont have the funds for the chevy garage. The guy said I can just come in and use the scanner, he has a newer OTC scanner too.
    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.

  6. #6
    Join Date
    Apr 2017
    Posts
    25

    Default

    I finally got it all sorted out.
    I had previously run with a vacuum gauge and vacuum was very good.
    After cleaning more terminals and replacing the boost control solenoid with one from NAPA I could get a max of 5 pounds of boost.
    More testing and running did not produce any better results.
    Rechecked the vacuum pump, ha, way down on acuum, pulled the pump, inspected the tubes and couplers, installed a new pump. Got real nice boost for about three miles over the Yellowstone hill. Then it all of a sudden quit boosting.
    I had the old Delco boost solenoid and put that on, had real good boost. In the mean time I took the faulty solenoid back to NAPA and got a replacement.
    Next trip out was 60 miles round trip. About 15 miles into the journey the old delco give up the ghost.
    Got back home and installed the other NAPA unit, next 60 mile round trip, the boost would fluctuate like a yoyo, on the flats 0 to 2 pounds of boost, on the hills, 5 to 1 pounds of boost, but still like a YOYO.
    the new Delco solenoid got here, installed it and now the boost has been working very nicely.
    At about 25 MPH, punch the throttle, trans kicks down, boost jumps to 12 PSI then levels down to ten.
    Trucks happy, I`m happy, can not expect much more than that. LOL
    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. #7
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,842

    Default

    Thanks for the update, one would not expect to have so many part failures, especially new ones. The boost gauge is essential for diagnosing problems.
    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.

  8. #8
    Join Date
    Apr 2017
    Posts
    25

    Default

    Quote Originally Posted by grancito View Post
    Thanks for the update, one would not expect to have so many part failures, especially new ones. The boost gauge is essential for diagnosing problems.
    Thank You.
    I took the third failed NAPA boost solenoid back and got a refund.
    Just trying different products, I picked up a BWD solenoid and now have it installed. After My next road trip I will update how that brand works out.
    I will be getting another Delco unit for the main spare.
    Just experimenting and trying different sensors and components.
    I do ave the FFM adapter bolt ordered with a fuel pressure gauge kit coming from leroy Diesel.
    The next set of gauges is going to be two vacuum gauges, one each side of the solenoid so i can keep those monitored too.
    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. #9
    Join Date
    Apr 2017
    Posts
    25

    Default

    I have now done a 60 mile test run with the BWD boost control solenoid. More and longer runs will be needed to test the reliability.
    the BWD solenoid seemed to perform as it should and boost pressures were great.
    I think from this that if the Delco solenoids were not available that the BWD units could be used as an alternate go to product.
    I also have a BWD boost sensor installed and it too seems to be a good product.
    Before replacing the vacuum pump, cleaning all terminals and installing either the Delco or the BWD solenoids, on the steepest grade of this run, the boost would go to about 4 pounds and the EGTs would climb to 900 degrees.
    Now with everything functioning as it should, the boost went to 8 pounds and the EGTs went to 600 degrees.
    I am happy with these results, truck seems happy too. LOL
    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.

  10. #10
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,842

    Default

    Quote Originally Posted by MrMarty51 View Post
    I have now done a 60 mile test run with the BWD boost control solenoid. More and longer runs will be needed to test the reliability.
    the BWD solenoid seemed to perform as it should and boost pressures were great.
    I think from this that if the Delco solenoids were not available that the BWD units could be used as an alternate go to product.
    I also have a BWD boost sensor installed and it too seems to be a good product.
    Before replacing the vacuum pump, cleaning all terminals and installing either the Delco or the BWD solenoids, on the steepest grade of this run, the boost would go to about 4 pounds and the EGTs would climb to 900 degrees.
    Now with everything functioning as it should, the boost went to 8 pounds and the EGTs went to 600 degrees.
    I am happy with these results, truck seems happy too. LOL
    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.
    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.

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