Injector rates?

[millerman04]

Whats a normal reading for balance rates on injectors? My trucks not startin the easiest now days. My buddy put his snap-on scanner on tonight and we found #3 injector was reading -1.0 to as low as -1.8 Does this me its bad? The other were all fairly close to 0.0 to 1.0 Any help or info would be great! Any dummy tips on how to check them with my efi an laptop? Thanks all!!!

 

[jacobdewey]

Warm up the truck and on a stock tune at idle,+4 or -4 in park, or +6 or-6 in drive with foot on the brake. As long as you are within those parameters you are fine.

I'd look at more simple things, like batteries, filter heads, and other small things first.

-1.0 and 1.8 are still good balance rates and nothing to be concerned about whatsoever.

 

[millerman04]

Wat would be causing extreme hard starts? Batts are new. Same as the filters.

 

[millerman04]

He also said its crankin over with 7psi. Said somin about it needin 10 psi to be able to start?

 

[Robby05]

Try pumping the primer on the fuel filter before starting. Could be time to rebuild the filter head

 

[02greysixer]

He also said its crankin over with 7psi. Said somin about it needin 10 psi to be able to start?

Supply pressure or rail pressures minus some 0's? A Duramax does not need any supply pressure to start or run. But if you do not have a lift pump it will air lock easily. May try pumping the hand primer on filter head. But if you are only getting 700psi of rail pressure during cranking it will not start. Needs at least 1200psi to start and run I believe. If that is the case you need to do a return test on the cp3 pump and injectors.

 

[Max Attitude]

Glow plugs? Do you have a check engine light?

 

[millerman04]

Filter head was just rebuilt. How do i check the return on the cp3 and injectors? I had it runnin tonight since 7pm. Just now shut it off and it wont start. Oh and the primer pump has pressure.

 

[millerman04]

What other posibilities could my problem be?

 

[Max Attitude]

I take it you don't have any blue or grey smoke? Maybe look into the cp3.

 

[millerman04]

When it runs there is no smoke. None at idle warm or cold. It is throwin a P1093 low rail pressure code too. I forgot to post that last night.

 

[NC-smokinlmm]

What's the desired vs actual rail pressure doing?

 

[millerman04]

Rail pressure at idle on stock tune was around 5200 psi. It was averaging around 19,755.63 I seen the desired amount but really dont remember it now. Pulse width was all the same. Idle it stayed around 53,000 to 55,000.

 

[millerman04]

How do i do the return rate tests?

 

[Max Attitude]

I would start using the search button. They are many threads relating to the code you have. I'm sure there's a how to do return rates also.

 

[millerman04]

Yea ive been googling all day today. Found some other optiond too.

 

[onebaddmaxxx]

Check your fuel also and make sure its clean. Seen gas in them cause 1093.

 

[millerman04]

Ive got a quart of 2 stroke oil and a quart of trans fluid dumped in hopin it would clean up. Dont think if helped any.