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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Does plugging it in overnight help?
How cold is it outside when this happens?
Any codes stored?
Will your scan tool do an injector buzz test?
Have you checked the fuel pressure?
Doing the buzz test see if any injectors sound weaker than the others.
A fuel pressure test is needed to see if the pump is weak, not feeding the filter housing with enough pressure.
Since plugging it in helps, testing each glow plug to see if they get hot is needed.
1960 no such code. 1690 is a issue with the waste gate control solenoid.
0380 glow plug relay issue https://dl.dropboxusercontent.com/u/90220402/0380.pdf
0230 fuel pump relay control concern https://dl.dropboxusercontent.com/u/90220402/0230.pdf
0232 fuel pump relay control concern
0640 intake manifold heater concern.
The focus needs to be on the glow plug and fuel pump codes, can you do the diag steps included above.
Thanks for using Just Answer, and rating me so I am compensated, Chris
Hello again Chris here,