Need some added thoughts

[littlejeepr]

Well guys here it goes, I've noticed over and reading about the LB7 for a while now that they have a cronic injector problem.:doh:. I don't have any of the signs and the truck seems to run extremely well. I've noticed over the last 3 weeks of ownership that every 5 min or so the truck seems to idle up. So i running a fuel additive to help clean up the injectors. Tonight since my buddy does performance tuning and i had to weld something up for him I'd have him check out my puter. I have no fault codes in the PCm so that is a good thing, good fuel preassure and making 20 psi of boost at WOT. So we decided to check the injectors and found one wasn't moving around much and was at .322 (pw)and the min spot was.120 there were 4 injectors with a .398 for a PW and a low of .252 the other three were at .412 and a min of roughly of the same .252. When the idle shifted the one that was the lowest dropped real low. Then he reset them and the low one came up. Could this be a sign of injectors just being clogged up or are they ready to drop out. After the reset on the injectors the idle stayed normal then after my drive home it is back.

Sorry for the long post but new to the hole diesel factor. The PW were results form his EFI live

Over the next bit i should be over my injector paranoya:beer:

 

[durallymax]

PW=Pulse Width. thats not what you need to be checking with the scan tool. you need to be checking the balance rates. But judging by the numbers you posted he may have been checking the blance rates and you just move the decimal and mislabeled it. THe pulse width will be the same between cylinders for the most part.

The blanace rate is how much the injector has to compensate to make each cylinder fire equally.

Heres the best way to check the balance rates.

Get the truck up to operation temp. Then set the parking brake and put it in drive. dont touch the throttle. With the scan tool running and injectors 1-8 balance rates selected start logging. YOu should see no more than +/-6 during this test. If you do, they are bad take it to the dealer unless it is no longer covered. The special serviec policy covers them for 7 years or 200,000 miles.

 

[littlejeepr]

It was late so this weekend we will check it again I know the efi live is new to him so he is still working his way around it. I'll just have him double check then when we put a small tune into the truck. The truck runs extremely well and like i said when i put the injector cleaner in it has been getting a bit better. Just will have ot wait and see i guess.

 

[durallymax]

well since yours is an 02 they most likely arent covered anymore so dont look too hard for bad ones. if you show no symptoms then your truck is fine

 

[littlejeepr]

most definitely not going to go digging to much just string to find my strange idle issue it will idle fine for 3 min and with all the accesories of it's like it picks up 100 rpm then drops back off. Well at least sounds like a 100 rpm. I'm going to go witht he thought that if there hasn't been a injector problem by now that there going to be okay. If i keep looking i'm either going to find a problem or create one I'm going to goto the boneyard and see if i can find a newer turbo inlet pip so i can rig something together to get the afe cold air kit i have on. Need to finish getting the maintenence done first. If i would have bought the truck in januarry then I would still have warranty since now it has been over 7 years since the truck was put into service, I only have 212XXX Kilometers on the truck which is about 132,xxx miles.