LB7 cranks a LONG time before starting

[dscluchfc]

The dealership, Scoggin Dickey in Lubbock TX just replaced my injectors and injector pump, on the LB7 that has 232,000 miles on it due to the dreaded while cloud in exhaust at idle. Four injectors 1,8,6, & 7 were bad, and upon inspection, the rail showed possible metal contamination possibly from the CP3, so it was replaced as well because I am back in for repairs now after having the injectors done at 186,000 miles. 46,000 on a set is not good, IMO.

Prior to the work being done, you could turn the key to start and about two turns of the motor and it started....rer, rer start...it has always been like that.

Now with the new injectors and injector pump, turn the key and it turns over for about 10 seconds before starting.
rer rer rer rer...ad naseaum for up to 15 seconds, then start...
after starting it runs fine going down the road.
They warned me it was taking longer to start and said it was probably "air" in the fuel lines someplace that would work its way out.
Further, I now have some surge at idle....not so much noticeable on the tach but to the ear it is quite noticeable.

Not so sure I buy that "air" excuse for the slow start...and I don't know about the surging at all.

I am an insurance agent, not a mechanic at all....so, anyone here have a clue as to why it is so slow to start?
or why it now surges?

Thanks for your input!

 

[hondarider552]

The dealership, Scoggin Dickey

:rofl::rofl:

Sorry, just had to laugh.

 

[JMK777]

Did they change all 8 injectors? Or just 4?

 

[dscluchfc]

changed all 8 injectors, and I did see them all out when I went by to ask that the fuel rails be checked for contaminant metal which could indicate beginnings of CP3 failure which could be spitting metal at the injectors.
this set lasted 46,000 miles.....not NEARLY enough miles.

 

[JMK777]

Might be low rail pressure on cranking/startup.

 

[dscluchfc]

Might be low rail pressure on cranking/startup.

ok....it doesn't seem to matter if it has been just turned off or not.
regardless it takes 10 seconds of cranking to start it.
Bad reman CP3 unit?

Right now I have 12,000 miles of warranty on their work to hold their feet to the fire....I just want to know how to do that.

 

[2003dmax6701]

Hey I would check an make sure that you do not have a blockage in you fuel lines. check the pickup in the tank to I had a blockage there. Make sure that all you fuel lines are in good condition they could be cracked and causing a bleed back. if that dont work you might need to take it back to the dealership get the fuel pressure check.

 

[dscluchfc]

Hey I would check an make sure that you do not have a blockage in you fuel lines. check the pickup in the tank to I had a blockage there. Make sure that all you fuel lines are in good condition they could be cracked and causing a bleed back. if that dont work you might need to take it back to the dealership get the fuel pressure check.

I guess I neglected to mention they replaced the fuel pump/gauge sensor unit just a few weeks ago so my fuel gauge would work. The tech said the tank was clean, and when driving it, I can floor it and it will not starve for fuel.

I guess I need to know more about bleed back?....

 

[JoshH]

There's a problem there. 23k psi of fuel pressure will get rid of any air real quick. It could be an injector(s), the CP3, a high pressure fuel leak, or (less likely based on what you're saying) a leak on the low pressure side most likely at the fuel filter/filter head.

 

[dscluchfc]

There's a problem there. 23k psi of fuel pressure will get rid of any air real quick. It could be an injector(s), the CP3, a high pressure fuel leak, or (less likely based on what you're saying) a leak on the low pressure side most likely at the fuel filter/filter head.

thanks for the input!

 

[dscluchfc]

Diagnosed and fixed.
Bad rubber hose connection not tight between fuel filter and CP3 allowing the bleed back to occur.
Just to be safe rubber hose was replaced. Now behaves perfectly.