Question on starting hard

[Just Pin It!!]

Ok I have an '02 LB7 and it starts fine when its cold but when its hot it cranks for quite a bit before firing. Someone told me its a module of some sort to do with the glow plugs but didn't tell me which one, does any one know?

Thanks in advance, Scott

 

[bullfrogjohnson]

Sounds like high return rates on the injectors. Make sure you don't have any fuel in your oil.

 

[Just Pin It!!]

Guess I have to ask the dumb question, how do you tell if you have fuel in your oil? Looks like reg oil on the dipstick, or should I drain it and look at all of it? I have an Quadzilla programmer and it shows rates on the injectors I think, what is a high return rate on the injectors? (number wise)

 

[hondarider552]

I do not think the quadzilla's will show return rates, only injector balance rates.

Pull the dipsticks and smell it for diesel, or wipe some on a paper towell.

 

[MACKIN]

I concur check return rate and do a wick test which is pull the dipstick and allow a drip to land on a white paper towel and see if it fans out. Not very scientific but it works. Diesel dilutes the oil and causes it to absorb and fan out.

Hopefully it's not that but you have to check it out.

 

[Just Pin It!!]

Ok I will check it on break and let you guys know... If there is fuel in the oil than what? How bad is it the fix?
Just looked up on quadzillapower.com and the tuner shows Fuel Des XXXXPsi and Fuel Act XXXXPsi?? what ever that is? and what the injectors PW XX.XMS??

 

[Just Pin It!!]

Sorry for all the stupid questions just not up on all this diesel stuff.

 

[MACKIN]

Thats no help what the tuner said you need a Tech II or equivalent to check return rate. If you have fuel in the oil then you have a leak. Could be injectors. Have they ever been changed?

 

[JoshH]

Return rates cannot be checked with any type of scan tool. Only balance rates can be checked with a scan tool.

 

[MACKIN]

Ya I meant balance rates sorry.

 

[Just Pin It!!]

no never been changed, truck only has 80k on it (father never drove it much..lol)

 

[Just Pin It!!]

Can you just change the bad injectors or is it better to change all 8? By the way I do have fuel in my oil.

 

[02greysixer]

Can you just change the bad injectors or is it better to change all 8? By the way I do have fuel in my oil.

Change all 8, speaking from experience here. It's expensive but you'll be better off in the long run


Sint frum tha orijinul smert fone

 

[Just Pin It!!]

Next question, better to get them rebuilt or just by new ones?

 

[kx500]

Arnt thay under a 200,000 mile warranty?

 

[Chevy1925]

Arnt thay under a 200,000 mile warranty?

Or 7 years. What ever comes first.

 

[Just Pin It!!]

And 7 years came early on my '02...:rofl:...

 

[Bonestock]

Possibly cp3? Log rail psi while cranking hot &I cold.

 

[ripmf666]

Return rate test

http://www.duramaxdiesels.com/forum/showpost.php?p=495914&postcount=287

http://www.duramaxdiesels.com/forum/showpost.php?p=495917&postcount=288

 

[Just Pin It!!]

Ok guys... what gives... I just changed my fuel filter since I got my oil changed and asked them to look at the oil to see if there was any fuel in it. They said if there was there wasn't much. But tonight I changed my fuel filter and took the truck for a drive and warmed up the truck pretty good, running it kind of hard. I came back to the drive way and shut the truck off and tried to start it again and it started right up. I let it set alittle bit and it still started right up. I'm confused now...LOL... Guess I will try to find someone to check my injectors anyway to see if they are bad.