Ok this is a weird one.
I have a shake the whole truck vibration that gets worse with more throttle. I can watch the coiled radar power cord on the visor in the cab vibrate and feel it. If I power brake you feel it bad.
I started the truck to show the issue and it wasn't there. Powerbraking and all. (Full stop and rolling powerbrake makes no difference to the vibration.) Drove around the block and still fine. Then the cold advance high cold idle kicked off from 1000 RPM to the normal idle RPM. Then the shaking under power started.
Idles fine without any miss.
Just vibrates severely like it is missing when you are stopped and powerbraking or normal acceleration. Will do this less when it is fully warmed up.
As the cold high idle/advance makes the difference a lot of stuff is eliminated. Like Transmission and bad engine mounts.
Harmonic Damper just replaced - did it before. Drive shaft timed as it was out of time... Lift pump 8 PSI engine off and 7 PSI running. New air and fuel filter. No smoke.
Only thing I can think of is the inj pump timing is off. :confused5: That or the timing is changing in the pump rapidly. Maybe restricted return line varying housing pressure and advance or fubar light load advance stuff on the side of the pump??? Hmmm I will have to check that but any common failures?
Advance ideas for timing changes that may or may not be the cause taken from here:
http://www.dieselpowermag.com/tech/general/0809dp_stanadyne_db2_injection_pump/index.html
I have a shake the whole truck vibration that gets worse with more throttle. I can watch the coiled radar power cord on the visor in the cab vibrate and feel it. If I power brake you feel it bad.
I started the truck to show the issue and it wasn't there. Powerbraking and all. (Full stop and rolling powerbrake makes no difference to the vibration.) Drove around the block and still fine. Then the cold advance high cold idle kicked off from 1000 RPM to the normal idle RPM. Then the shaking under power started.
Idles fine without any miss.
Just vibrates severely like it is missing when you are stopped and powerbraking or normal acceleration. Will do this less when it is fully warmed up.
As the cold high idle/advance makes the difference a lot of stuff is eliminated. Like Transmission and bad engine mounts.
Harmonic Damper just replaced - did it before. Drive shaft timed as it was out of time... Lift pump 8 PSI engine off and 7 PSI running. New air and fuel filter. No smoke.
Only thing I can think of is the inj pump timing is off. :confused5: That or the timing is changing in the pump rapidly. Maybe restricted return line varying housing pressure and advance or fubar light load advance stuff on the side of the pump??? Hmmm I will have to check that but any common failures?
Advance ideas for timing changes that may or may not be the cause taken from here:
http://www.dieselpowermag.com/tech/general/0809dp_stanadyne_db2_injection_pump/index.html
