Are my injectors finished?

[FMOS]

Ever since I put a tuner on my truck for the first time it made a bit of blue smoke when it was cold (and cold outside). And its slowly got worse. Over the last year the idle has been intermitently rough when its cold as well. (Sometimes smooth, sometimes slightly rough). But it always made some blue smoke.

Now that the cold weather is here its smoking again, and harder than ever. The police actually stopped by my truck when it was idling and warming up to check if anything was on fire.

I've seen balance rates as high as +/- 5-7 on a few of them.

Whats your guys' thoughts?

And a set of replacement nozzles would not fix this would it? I would need a whole new injector? Any recommendations? Thanks.

I'd preferably like to do something about this now so that I don't smoke out the entire block with pungent, eye watering goodness everytime I start and warm up my truck all winter.

 

[wikdlmm]

I beleive that this numbers are out of gm specs.. An I don't think a nozzle would fix it. I believe you have to buy the whole injector..

 

[Vrabel]

nozzles wont fix it, they would only increase amount of improper fuel amount. Did you pass waranty mark?

 

[sweetdiesel]

I would check the wire harness

 

[FMOS]

Ya, warranty is gone. Even if I still had it, no way they would cover injectors after seeing the modifications under the hood.

What am I looking for on the wire harness? The one by the FICM for some rub through? I suppose I could redo the injector connectors too. But the truck runs perfectly fine 100% of the time. I didn't notice any rubbing issues on that harness that ran from the FICM across the intake manifold when I did the head gaskets. And now I have no egr and that portion of the harness is just suspended there nicely, not rubbing.

I should elaborate that the only thing that has been intermittent is the slightly off idle, and it hasn't been an issue at all. Its not lopey or anything. But the smoke is off the hook already! And it happens all the time once the amb temp gets below 10°C.

Widlmm - I've never been an advocate for balance rates indicating that injectors are buggered. But I suppose in this case it might be so. I believe the standard is 4 in park and 6 in drive. And I'm not all that much outside of that. So balance rates still leave a lot of mystery to the situation.

 

[wikdlmm]

Ya, warranty is gone. Even if I still had it, no way they would cover injectors after seeing the modifications u

nder the hood.

What am I looking for on the wire harness? The one by the FICM for some rub through? I suppose I could redo the injector connectors too. But the truck runs perfectly fine 100% of the time. I didn't notice any rubbing issues on that harness that ran from the FICM across the intake manifold when I did the head gaskets. And now I have no egr and that portion of the harness is just suspended there nicely, not rubbing.

I should elaborate that the only thing that has been intermittent is the slightly off idle, and it hasn't been an issue at all. Its not lopey or anything. But the smoke is off the hook already! And it happens all the time once the amb temp gets below 10°C.

Widlmm - I've never been an advocate for balance rates indicating that injectors are buggered. But I suppose in this case it might be so. I believe the standard is 4 in park and 6 in drive. And I'm not all that much outside of that. So balance rates still leave a lot of mystery to the situation.

Ya I no my bro were bad on his 01 but it turned out to be a weak cp3

 

[S Phinney]

Injectors are very tempermental parts. We have fuel with contaminants pushed through these babies at 23-28k of psi. I had a couple that I replaced that seemed fine but had a knocking noise at idle when in stop and go traffic where fuel and air temps get hotter. The injector guys were telling me nothing was wrong except the response time on two was off. I changed the body on those two and evrythings ok now. Short story is we can't explain some of these problems but injectors do weird things.

 

[FMOS]

Hmm... gearing up to change 8 injectors doesn't sound like something I want to do.

If I am going to buy injectors does anybody have any preferences? I'd like to buy some that are "50-100hp" injectors, but I'll need the whole unit, not just the nozzles. Who sells em?

I'll be keeping the stock CP3 on my LLY with no plans to upgrade. Can the bigger injectors be tuned out to some degree so it runs like the stock injectors? Reason for going bigger would be when I decide to run a bigger tune, I can run a shorter PW and a bit less timing. Currently my "race" tune runs about 3300PW and 31-33° advance.

 

[TheBac]

I should take video of my truck starting on a cold morning. You guys would swear I had a big-block Chevy with bad rings and a huge cam under the hood. After a minute of two she smooths out, though. Guess I have to start saving for injectors (warranty up in less than a month).

 

[S Phinney]

From what I have been told 30 percent range would be about max to run with the stock single. They can be tuned to run just like stock. Just make sure you get them flowed and balanced and I hear a lot of negatives about II injectors. I don't have personal experience with them. I do have personal experience with injectors from Pro-formance Injection and they do a very good job with them.

 

[LBZ]

Before you get too carried away, switch back to stock and see what happens. It could be the tune causing the smoke, not bad injectors. Mine smokes bad with my hot tune after it idle's for a bit, but my tow tune doesn't hardly smoke at all.

Maybe change your fuel filter as well. When filtering down to 3 microns, the slightest bit of restriction can cause strange problems.

 

[DuramaxPowered]

Guess I have to start saving for injectors (warranty up in less than a month).

No, they need to go out within a month

 

[TrentNell]

I should take video of my truck starting on a cold morning. You guys would swear I had a big-block Chevy with bad rings and a huge cam under the hood. After a minute of two she smooths out, though. Guess I have to start saving for injectors (warranty up in less than a month).

Might be time for a little diesel fuel in the crank case 1 block from the dealer Tom ,




To the OP , PM Simon , he had a contact on some injectors right from bosch that were bigger than stock , and coming right from Bosch i would imagine they are perfectly flowed

 

[TheBac]

LOL....I think my CP3 would fail the Regulator test, Trent. It holds rail just fine.

Mine smokes in cold whether its stock tune or 500hp. Just one of those things....

 

[custom8726]

Were you checking your Balance Rates with your race tune in or stock tune?

 

[FMOS]

I've checked balance rates on stock and modified tunes, not much difference actually. The only thing that is really altered at idle is the timing by a slight bit. Its lowered, which will make a bit more smoke I know, but its better than the god awful knocking that the truck gets when it pulls a -50 start.

Regardless, stock tune it still smokes just as bad.

And its only when cold that it smokes. Even when its -30 out, if the truck has been running for more than 5-10 minutes there is no smoke. Soon as it warms up the smoke is gone.

 

[custom8726]

I have 8 LLY injectors sitting in the garage, that I planned on selling cheap for cores. They all worked but I was not happy with a few balance rates so I put my originals back in with the 40 over nozzles. Anyways if you want to do a little experimenting these would work for you and also will give you a set of nozzles to be sent out for honing in the future if you choose. Let me know if your interested.

 

[custom8726]

oh yeah, I would suggest just switching a injector first, that way you will know for sure its the injector itself. It's really not hard to switch them out.

 

[FMOS]

Ya, I've had them all out before when I did the HG's.

I might be interested...

Where can I buy brand new injectors with modified nozzles?

 

[FMOS]

I checked at the dealership for injectors just for shits and giggles. 924 bucks a piece... the dude in the parts line behind me almost shiot haha. Especially after I said I need 8 of them.

Anyways, I didn't buy those obviously. I'll look into some remans from a bosch dealer this week. Then I need to check the truck, maybe I can get away with just replacing a couple.

Anybody got any tips for diagnosing injectors other than checking balance rates?

... Can I pull injector connectors at idle and see how the truck responds? If it stops smoking or smokes less when I pull certain ones can I be fairly certain its those ones? Or is that a bad idea period? Any tips would be helpful.