LB7: Injector help please

[SparkZ03DMAX]

Ok, so its obvious that my injector 8 is going out. I keep having cylinder 8 misfires at idle (P0308). Last time I went to Harley to get a reflash he noticed that injector 8 was requiring more fuel than the others. This was before I would have the check engine light on. It has only progressed since then. So I was thinkin about just changing that one injector instead of all 8 (because lack of money/job). Im afraid of dong myself because lets admit I'm no mechanic and I afraid of messing up the injector cup and/or getting the injector dirty while installing.

My point is, whats a good price for having someone changing the injector for me? Cause I really don't feel like being screwed over on price. So what kind of numbers am I looking for?

 

[Lb7KID]

hate to say it but once you are in there and have the valve covors off. it best to do them all. thats way youer not paying some one twice for the same job.

 

[SparkZ03DMAX]

hate to say it but once you are in there and have the valve covors off. it best to do them all. thats way youer not paying some one twice for the same job.

i know, but I just dont have the money. Trust me, I wont to replace them all, just so i dont have to worry about it anymore

 

[Lb7KID]

i know, but I just dont have the money. Trust me, I wont to replace them all, just so i dont have to worry about it anymore

yea ha iv been there a few times.. my poor truck had to sit for 9 mounth once befor i got the mony to fix it haha oh well... hey have you looked around and priced how much it would be to rebuild youer stock ones????

 

[SparkZ03DMAX]

yea ha iv been there a few times.. my poor truck had to sit for 9 mounth once befor i got the mony to fix it haha oh well... hey have you looked around and priced how much it would be to rebuild youer stock ones????

ive only got prices for remaned injectors. u can rebuild the factory ones?

 

[Lb7KID]

yup you sure can i sent mine off to industrial injection they rebuildt 6 sold me to remans i think i was right around 1300? i could be wrong i would have to do some digging i got (90) over tips to so they say but dont no how that works yea call and check places out see what they say never hurts :thumb:

 

[JoshH]

I would do a compression check before you go swapping injectors.

 

[SparkZ03DMAX]

I would do a compression check before you go swapping injectors.

where can I go to do that?

 

[JoshH]

If you guy a compression tester, you can do it yourself. It's a pretty simple procedure. You do it through the glow plug holes. Otherwise, any diesel shop that works on Duramaxes should have the necessary tools.

 

[SparkZ03DMAX]

What else would cause a P0308 code? I really dont have the money for 8 injectors. Should I get a injector balance check, and see if its jus one injector and jus replace that injector?

 

[JoshH]

Low compression on the number 8 cylinder could cause it. That's why I suggested you check it. Could go either way, but a compression check is cheap and easy to do (relatively). I would hate to see you change an injector and end up with the same problem still. A positive balance rate is either a lack of fuel or a lack of compression to burn the fuel. Typically when injectors go they dribble fuel and have a negative balance rate, but they can go the other way too.

 

[SparkZ03DMAX]

Low compression on the number 8 cylinder could cause it. That's why I suggested you check it. Could go either way, but a compression check is cheap and easy to do (relatively). I would hate to see you change an injector and end up with the same problem still. A positive balance rate is either a lack of fuel or a lack of compression to burn the fuel. Typically when injectors go they dribble fuel and have a negative balance rate, but they can go the other way too.

any reason why their would be a low compression in cylinder 8? jw

 

[wdino73]

If I may add I agree with the compression test, I've have recently aquired the knowledge that just because the balance rates are off doesn't mean an injector is bad, I burn a piston an the truck ran really bad, I did an balance test it showed the #7 was over fueling alot, at first glance the injector is bad but I did a compression test an no compression injector was good, I don't think u have this issue I was just trying to explain how balance rates can be miss reading, low compression, could be from a head gasket leaking a valve stuck, cracked ring, cracked piston, Like Josh said its best to have a compression test done it will tell u what condition the engine is, hopefully it is just the injector, I wish u the best of luck,,,,,, Sry Josh, I didn't mean to interupt u.

 

[SparkZ03DMAX]

So ur sayin, to get the compression test to just show how things are going. But MOST LIKELY its the injector, right?

 

[wdino73]

More than likely YES, but theirs always a chance it could be something, also doing a compression always make me feel better about the condiion of the upper internals..
Best of Luck:thumb:

 

[SparkZ03DMAX]

More than likely YES, but theirs always a chance it could be something, also doing a compression always make me feel better about the condiion of the upper internals..
Best of Luck:thumb:

thanks ill see wat i can do. Wats a rough price on having somone change one injector?

 

[bcjoe]

If you find someone who's done it alot they should be able swap one out in 4-5 hours.

 

[Madspeed]

Goto fawkin Harbor Freight and buy a diesel compression tester and do it your damed self :thumb: On another note, Before you go buying injectors try running a LOT of DieselKleen in it. You can buy a gallon of it from Wally world (wall mart) and run the whole thing through it. I did and My balance rates turned to GOLD. It used to run rough intill it warmed up and then smoothed out. I tryed all kinds of shit and the thing that worked was DeiselKleen in the silver bottle now my return rates are also some of the best theyd ever seen at my old stealer I used to work at

 

[GeorgiaDuramax]

Have you talked to Harley about it yet sparks?

 

[wdino73]

yeah, I got mine at Harbor Frieght works great I think it was like $20,
If it the right side injectors which are the easiest to do, around $200-$300. I would do it for u but, I'm in Ky