Help With Engine Noise !
09-30-2007, 01:21 PM
#31
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Well i used new conection tubes " u do know they are a crush styl they have to stay matched to ther injector 1-1 2-2 so on " is that a possibilty for U? Mine probable not like i said i used new ones. OK did u seat the injector by hand u will hear or feel it pop in insert the 2 hold down bolts " FINGURE TIGHT" then the conection tube and hold down nut AGAIN FINGURE TIGHT then tourqe the injector evenly then the conection tube nut . RIGHT
??????
09-30-2007, 01:48 PM
#32
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they don't necessarily need to match the injectors. If you have the Cummins manual though, it does say to replace the tubes anytime they come out. I bet this might be where your problem is. If you're using reused tubes, you might have a small leak. The tips of the tube will deform and not sit flush in the injector. That's why the torques are so imperative. The metal the tubes are made out of is really soft.
I've been this route with mine though too. I had EDMed tubes and honed injectors. I thought the injectors might be a problem but, they check fine. I thought the tubes might be a problem so, I replaced them with new one's. Wasn't the problem.
There's a LOT of variable in this problem... finding the right one is a trick
I've been this route with mine though too. I had EDMed tubes and honed injectors. I thought the injectors might be a problem but, they check fine. I thought the tubes might be a problem so, I replaced them with new one's. Wasn't the problem.
There's a LOT of variable in this problem... finding the right one is a trick
09-30-2007, 02:10 PM
#33
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No Doubt About The Trick.i've Been Fortunate In The Past With The Same Tubes, I Don't Know What Else To Do.i Have Ideas But Don't Want To Guess.sometimes Guessing Will Find The Culprit.
09-30-2007, 04:20 PM
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I also noticed some mild timing rattle after installing the new sticks. Beta 4.4 used to have no timing rattle on my truck. Now with 4.4 it sounds more like the standard program did. I'm not sure if the beta versions are geared toward aftermarket injectors or stockers?
I'm going to try 4.4 on #8 and see what happens. Maybe stack an XZT with it for a little extra pressure and timing.
I'm going to try 4.4 on #8 and see what happens. Maybe stack an XZT with it for a little extra pressure and timing.
I WOULD OF THOUGHT THAT THE "RATTLE" SOUND IS JUST MORE FUEL...
HOW CAN THE STICKS CHANGE TIMING? EDUCATE ME PLEASE!!
09-30-2007, 04:39 PM
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I could be wrong, but I think sticks do have some affect on timing. Don't the Smarty aftermarket injector programs have less advanced timing on the odd numbers (when compared to the stock injector programs)?
09-30-2007, 05:28 PM
#36
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YES, I HEARD THAT, BUT I DON'T HOW RETARDED IT IS.I STILL DON'T UNDERSTAND HOW STICKS HAS ANYTHING TO DO WITH TIMING,DOES'NT MEAN IT CAN'T JUST BECAUSE I DON'T UNDERSTAND THOUUGH.
09-30-2007, 05:31 PM
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Aftemarket injectors do have a little advance built into them. The aftermarket injector program for the smarty doesn't advance the timing as much as the regular program IIRC.
09-30-2007, 06:28 PM
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Just Wondering If It's Ok. It's Louder Than Any Other Box Or Programmer I've Heard Before.it Sounds Just Like Fuel Knock, But No Smoke At All Even At Wot.my Truck Is Stock Right Now Too.i Can't Even Put Any Mods On With Timing.maybe I'm Being A Pestimist...i Floored It At A Dead Stop And There Was No Smoke,no Hesitation,not Even A Miss Or Hint Of An Issue,except That Loud Knocking Sound!!!!i Know It Don't Take Long To Ruin A Cr????
09-30-2007, 07:12 PM
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I had the same problem with some 75hp injectors.. I recently stepped up to some 150 injectors and a stg3 pump and it cleared up for the most part. Still have just a slight rattle at lower rpm's. FWIW, When I was having the problem about the only thing that seemed to help much was running my programmer at the lower settings. Hope you get it figured out.
09-30-2007, 07:34 PM
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According to the manual I guess we're both kinda right...and wrong. 
7. Tightening Sequence:
a) Install fuel injector hold down clamp (mounting flange) bolts. Be sure the clamp is perpendicular to the injector body. Do a preliminary tightening of these bolts to 44 in-lbs. This preliminary tightening insures the fuel injector is seated and centered.
b) After tightening, relieve bolt torque, but leave both bolts threaded in place.
c) Install high-pressure connector and retaining nut. Do a preliminary tightening to 11 ft-lbs.
d) Alternately tighten injector hold down bolts to 89 in-lbs.
e) Do a final tightening of the high-pressure connector and retaining nut. Tighten to 37 ft-lbs.
7. Tightening Sequence:
a) Install fuel injector hold down clamp (mounting flange) bolts. Be sure the clamp is perpendicular to the injector body. Do a preliminary tightening of these bolts to 44 in-lbs. This preliminary tightening insures the fuel injector is seated and centered.
b) After tightening, relieve bolt torque, but leave both bolts threaded in place.
c) Install high-pressure connector and retaining nut. Do a preliminary tightening to 11 ft-lbs.
d) Alternately tighten injector hold down bolts to 89 in-lbs.
e) Do a final tightening of the high-pressure connector and retaining nut. Tighten to 37 ft-lbs.
09-30-2007, 07:47 PM
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09-30-2007, 08:18 PM
#42
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I need help understanding the whole timing statements. I'm not being accusatory or anything, but..........How can an injector have timing built into it? How can an injector change timing? They are electrical solenoid valves. Period. They cannot open until the computer tells them to, and the computer has no idea if they have larger nozzles or not. Please explain how or why the computer will change timing, when it has no way of realizing that anything has changed?
09-30-2007, 08:34 PM
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09-30-2007, 08:36 PM
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I had the same problem with some 75hp injectors.. I recently stepped up to some 150 injectors and a stg3 pump and it cleared up for the most part. Still have just a slight rattle at lower rpm's. FWIW, When I was having the problem about the only thing that seemed to help much was running my programmer at the lower settings. Hope you get it figured out.