Duramax Diesels Forum Truck of the Week
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Old 04-17-2018, 06:20 PM
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Default Injector balance/ rattle issues

I got some s&s 150% over injectors and installed in my truck, they were used with 2k miles on them and I saw before they were pulled that the balance rates were all within 2.0 to -2.0 and I picked them up immediately after they were pulled. They sat in my house for about 6 weeks before I just now got to putting them in. Got them in and loaded new tuning started and drove it fine and it ran good, got back and checked balance rates in park and got the reading with injector 1 at 5.7... in drive they drop back down to the second picture below I just put some injector cleaner in the tank and if that doesn't work will try to set the balances to the same with a tech 2, if that doesn't work I'll switch injectors around to see if it follows, any other things I need to be checking for or looking at? It also has an injector rattle slightly while driving and sitting still in drive
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2006 Chevrolet 2500LBZ
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Old 04-17-2018, 06:23 PM
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High pressure lines were cracked open to remove the injectors and probably got trash in them. That’s why buying used regardless of mileage is not a good idea. Balance rates before mean nothing.
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Old 04-17-2018, 06:28 PM
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I am unable to load pictures for some reason, they must be too big so I'll type them in
In park,
Inj.1_5.7
Inj.2_3.3
Inj.3_-1.2
Inj.4_0.1
Inj.5_3.0
Inj.6_-3.7
Inj.7_-4.0
Inj.8_-3.2

In drive
Inj.1_1.9
Inj.2_1.6
Inj.3_-1.2
Inj.4_1.8
Inj.5_0.1
Inj.6_-1.2
Inj.7_-1.9
Inj.8_-1.2


Truck was at operating temp thank you in advance
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2006 Chevrolet 2500LBZ
5" exhaust, S&B intake, intercooler pipes + Y-bridge hsp, PPE race plug +ported fittings, fass 150 trans tuning Dmax tuner, engine tuning Danville performance, Danville Performance 3794 Stg2 billet 68mm wheel+housing, built trans, Goerend"R" converter
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Old 04-17-2018, 07:11 PM
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I have not been around a lot of big injector trucks but the ones I have been around including my own seemed like balance rates was way off. Even with new.
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Old 04-17-2018, 07:14 PM
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Quote:
Originally Posted by Ne-max View Post
I have not been around a lot of big injector trucks but the ones I have been around including my own seemed like balance rates was way off. Even with new.
What about having some rattle to them? This is my first time around big injectors
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2006 Chevrolet 2500LBZ
5" exhaust, S&B intake, intercooler pipes + Y-bridge hsp, PPE race plug +ported fittings, fass 150 trans tuning Dmax tuner, engine tuning Danville performance, Danville Performance 3794 Stg2 billet 68mm wheel+housing, built trans, Goerend"R" converter
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Old 04-17-2018, 07:16 PM
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Quote:
Originally Posted by Jesse2006duramax View Post
What about having some rattle to them? This is my first time around big injectors
Rattle at idle? Or rolling into it? Mine rattles when rolling into it. Is your rail pressure matching desired?
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Old 04-17-2018, 07:27 PM
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Quote:
Originally Posted by Ne-max View Post
Rattle at idle? Or rolling into it? Mine rattles when rolling into it. Is your rail pressure matching desired?
At idle when in drive and your foot on the brake or the parking brake set. I cant tell if it is doing it for sure or not while cruising but when you roll Into it is is quiet and doesn't rattle, I had a rattle with the stock ones when I would get on it before the turbo lit, not with these. It seems to run fine from what little I've driven it. And the desired and actual frp is hand and hand they stay together, it's about 7k at idle, not sure if that's a part of the reason or not I thought they were usually a little lower rail pressure at idle
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2006 Chevrolet 2500LBZ
5" exhaust, S&B intake, intercooler pipes + Y-bridge hsp, PPE race plug +ported fittings, fass 150 trans tuning Dmax tuner, engine tuning Danville performance, Danville Performance 3794 Stg2 billet 68mm wheel+housing, built trans, Goerend"R" converter
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Old 04-17-2018, 07:38 PM
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Higher rail at idle is normal. Helps keep it from hazing.
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