• Welcome to The Truck Stop! We see you haven't REGISTERED yet.

    Your truck knowledge is missing!
    • Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
    • We have tons of knowledge here for your diesel truck!
    • Post your own topics and reply to existing threads to help others out!
    • NO ADS! The site is fully functional and ad free!
    CLICK HERE TO REGISTER!

    Problems registering? Click here to contact us!

    Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!

Starting problem when hot.

  • It should stay set Kenny
Couldn't resist Jim, It's just the pot calling the kettle black.
Leo
 
Cool and to further my gradual understanding here, the Ko/Ko is a way to make it relearn if you don't have a bi directional scan tool on OBD1 Correct ? IN other words If I had downloaded Steph free version of GMTDScan I would have had to do the Ko/Ko 50x to relearn the TDCO ? And also that would be difficult to get the number exact where as with the full version of GMTDscan or Tech 1/2 you can stop the relearn at the value you want. I basically got my timing done but want to tie up loose ends with undertsanding this and also maybe this thread could be a reference for anyone who needs to do it.
 
BTW the original problem of cranking and cranking when hot and not staring I believe I cured with a new PMD. It is still a little sluggish with hot starts but don't think the timing is the reason. Probably just combined small things like the INj Pulse width, weak batts and weak glows.
 
OBD-2 will initiate a learn with the key on/key off procedure. I don't know if OBD-1 will after 50 key on/key off cycles. Mine never relearned a TDCOffset until I got Stefan's program and initiated a learn. Leo
 
OK just trying to get it straight. So with OBD1 the only way to intiatate a TDCO relearn is with a bi directional scan tool like Steph's.
 
AFAIK that is the only way. Some one else may know of a different way. Leo
 
Yes.

When I replaced my head gaskets and IP, the TDCO figure was still in the ECM from the last IP. This was with the batteries being removed from the truck for three days ....
 
OK so I pulled into the rest area after running on the highway. Truck was good an hot. The staties gave me a hard time about letting the truck idle while my wife changed our son so I shgut it off. About 15 mins later no start. Just crank and crank and crank. PMD is a Dtech on a cooler in the bumper. Truck would not start. I finally went and got a big pot of cold water out of the camper and poured it on the IP. Truck started right up. Had slight diesel knock as it first kicked off but started right away. I'm looking at a new IP huh ?:mad5:
Also the water in fuel light came randomly on while on this trip. Always get fuel in same place. Pulled over and drained about a quart of fuel from T fitting on front of motor with LP running truck off. Started back up light still randomly . Maybe bad sensor ? This is a used fuel manager I put on when I did feed the beast so I have my old one I can rape.
Some vacation.
 
Snapshot

I think my IP is on the way out. Tim gave me a price of 755$ for a rebuilt with guaranteed new OS and some other parts. Here's the snapshot when it wouldn't start after being shutoff for 15 mins hot.

Snapshot created 7/7/2008 11:25:25 AM
__________________________________________________________________
ENGINE SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Engine run time: 00:00:00
Boost pressure (MAP): 14.2 PSI
Desired EGR: 8.12 PSI
Desired idle: 638 RPM
EGR pressure: 14.36 PSI
EGR duty cycle: 0 %
Engine coolant temp: 208.4 F°
Engine speed: 94 RPM
Glow plug relay feedback: 0.1 Volts
Glow plug voltage: 0.2 Volts
Ignition voltage: 8.7 Volts
Wastegate duty cycle: 0 %

__________________________________________________________________
INFORMATION SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
PCM Calibration ID: 4805
Current DTCs: 0
Accel. ped. pos. 1: 0.59 Volts
Accel. ped. pos. 2: 4.53 Volts
Accel. ped. pos. 3: 4.1 Volts
Barometric pressure (BARO): 13.45 PSI
Battery voltage: 8.2 Volts
Fuel temperature: 176 F°
Intake air temp: 200 F°
Throttle position: 0 %
Turbo boost (Calculated): 0.75 PSI
Voltage reference sensor: 0.9 Volts

__________________________________________________________________
INJECTION PUMP SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Actual injection pump timing: 37.14 Deg °
Cam reference missed: 0 Counts
Crank reference missed: 0 Counts
Fuel calibration: 150 Counts
Fuel rate: 12.19 mm³
Fuel rate - Cruise: 0 mm³
Fuel rate - Idle: 0 mm³
Fuel rate - Maximum transient: 0 mm³
Fuel rate - Throttle requested: 14.62 mm³
Injection pulse width: 1.95 ms
Injection timing - Measured: 14 Deg °
Injection timing - Desired: 14 Deg °
TDC offset: -1.94 Deg °

__________________________________________________________________
TRANSMISSION SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
3-2 PWM solenoid duty cycle: 0 %
Cruise target speed: 0 MPH
Cruise speed error: 0 MPH
Current gear of transmission: 1 Gear
Current torque signal pressure: 25 PSI
Current transmission ratio: 1:4 Ratio
Error between desired and actual shift times for latest 1-2 upshift: 0.3 Sec
Error between desired and actual shift times for latest 2-3 upshift: 0 Sec
Force motor (PCS) - Duty cycle: 76.2 %
Force motor (PCS) - Feedback current: 0.9 Amps
Force motor (PCS) - Reference current: 0.62 Amps
Time of latest 1-2 upshift: 0 Sec
Time of latest 2-3 upshift: 0 Sec
TCC PWM solenoid duty cycle: 0 %
TCC slippage: 68 RPM
Transmission input speed: 48 RPM
Transmission output speed: 0 RPM
Transmission temperature: 180 F°
Turbine speed: 48 RPM
Vehicle speed: 0 MPH

__________________________________________________________________
STATUS FLAGS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Shift lever:
Drive 2

Cruise control:

TCC mode word 1:
TCC is being forced off
TCC enable solenoid valid
Low threshold for COPETCC selected
Use hyst. for vehicle speed
TCC is in release mode, slipping
TCC is in locked-adjust mode
TCC is being applied
Negative slip recently prevents apply

TCC mode word 2:
TCC PWM is on
Perform release
Perform apply
• Min. threshold occurred
TCC Bus. is valid
NDT occurs
Delay is in progress
Min. throttle occured

IOD port A:
Glow plug relay - Closed/Open
• Stepper motor inhibit - Run/Inhibit
Service Throttle Lamp - On/Off
EGR vent enable - On/Off
• Shift A - On/Off
Shift B - On/Off
TCC enable - On/Off (4L60E only)
• Force Motor enable - On/Off

IOD SOD status register:
Coolant temp. pullup select - On/Off
Trans. temp. pullup select - On/Off
Fuel calibration temp. select - On/Off
• Check Engine Lamp - On/Off
PWM1 - Reset/Normal
PWM2 - Reset/Normal
PWM3 - Reset/Normal
PWM4 - Reset/Normal

System status word:
FM shut off due to low battery
Force Motor pulse in progress
• Power is On/Off
COP2 is being serviced
Delco instrumentation PROM
• Powertrain is in motion

Discrete flags:
Brake - On/Off
A/C Compressor - Engaged/Disengaged
Power enrichment - Active/Inactive
Kickdown pattern - Active/Inactive
Four-Wheel Drive Low - Active/Inactive
Cruise low - Active/Inactive
Diagnostic - Requested/Not requested


__________________________________________________________________
 
Look at your ign voltage, battery voltage, and RPM during engine crank....all seem quite low....
 
chrisk1500 said:
Look at your ign voltage, battery voltage, and RPM during engine crank....all seem quite low....
Click to expand...

I saw that too but the cold water on the IP and the truck started instantly. Probably not a good sign for the IP. New batts are in the works though. Those readings may not be totally accurate in the fact that I had already been trying to start the truck for a good 5 mins before I took the snapshot. I may have ran it down.
 
chrisk1500 said:
How old are the batteries?

When my batteries were low on charge after my IP install I had a pulsewidth of 2.00ms....charging them up fixed the problem.
Click to expand...

You know looking back at this I should recheck my pulsewidth now that I got two new batts. Those INterstates I had may have been the problem . Truck starts like a Son of a Beech now.
 
You must log in or register to reply here.
Back
Top