Duramax Diesels Forum Truck of the Week
  #1  
Old 03-25-2012, 10:00 PM
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Default Injector Return Rate Test

Cranked for 10 seconds

7- 6ml
5- 3.5ml
3- 3ml
1- 4ml
2- 5ml
6- 3ml
8- 4ml
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Old 03-25-2012, 10:08 PM
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I think you found ur problem..
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2002 GMC 2500HD CC/SB LB7 2 Wheel drive 950+ RWHP
11.17@126 in the 1/4 with a 7.2x@100 in the 1/8th.
NEW BEST in the 1/8th 6.95@102, 10's Here I come!!

2003 Chevy 2500HD CC/LB LB7 4X4

2005 Chevy 2500HD RC/LB 4X4..............
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Old 03-25-2012, 10:09 PM
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What is spec??
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Old 03-25-2012, 10:25 PM
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Quote:
Originally Posted by hondarider552 View Post
What is spec??
I think it's this:

Spec fuel return rate is less than 4 milliliters (ml) per injector, 12 ml per side.
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Previous Dmax's
08' Sierra LMM CCLB Z71, Mike L. Trans, EFI Live, McRat Racing Tune 12.97@102.73
06' Sierra LBZ RCLB 4X4, Mike L. Trans, EFI Live, McRat Racing Tune 12.25@111.30
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Old 03-25-2012, 11:08 PM
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when you were cranking it did you time it or just crank it will the computer timed you out. I think the computer time out it 15 sec


The spec is 5ml per inj or 20ml for the bank.
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2002 GMC 2500HD CC/SB LB7 2 Wheel drive 950+ RWHP
11.17@126 in the 1/4 with a 7.2x@100 in the 1/8th.
NEW BEST in the 1/8th 6.95@102, 10's Here I come!!

2003 Chevy 2500HD CC/LB LB7 4X4

2005 Chevy 2500HD RC/LB 4X4..............
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Old 03-25-2012, 11:10 PM
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I timed it with a stop watch. I'm not sure those readings will yield a 70hp loss?
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Old 03-25-2012, 11:29 PM
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What was cyl 4?
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Old 03-26-2012, 04:38 AM
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x2 Nick can't count
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Old 03-26-2012, 06:03 AM
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Didnt test it.. too much shit in the way lol
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Old 03-26-2012, 07:28 AM
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how much is the CP3 returning?
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Old 03-26-2012, 09:27 AM
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Quote:
Originally Posted by LBZrcks View Post
I think it's this:

Spec fuel return rate is less than 4 milliliters (ml) per injector, 12 ml per side.

3 ML's per injector or 12 per side is the fail spec for injectors, and I believe the CP3 is 2 ounces for 15 seconds of cranking for it's return isolated from the rest of the system.
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Old 03-26-2012, 10:24 AM
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Ok you need to retest the system again. The crank time for the test is 15 sec, If you crank the ignition it should automaticly stop cranking after 15 sec (no need to time it). You should not see OVER 5ml per injector or 20 ml for the bank.

If you did the test for 10sec and you have a few 5's and a 6's you are going to WAY over spec. (need to repalce injectors)
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2002 GMC 2500HD CC/SB LB7 2 Wheel drive 950+ RWHP
11.17@126 in the 1/4 with a 7.2x@100 in the 1/8th.
NEW BEST in the 1/8th 6.95@102, 10's Here I come!!

2003 Chevy 2500HD CC/LB LB7 4X4

2005 Chevy 2500HD RC/LB 4X4..............

Last edited by Dan@PPE; 03-26-2012 at 10:41 AM.
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Old 03-27-2012, 01:26 PM
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Any results from cranking the full time? Looks like it might be time to spend some consumer dollars with the beloved Exergy folks in your sig.


Don't know whether to put a frown or smiley face emoticon so I put both.
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Old 03-27-2012, 05:53 PM
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sorry for off topic but are you guys saying our trucks wont crank any longer than 15 seconds??? ive never tried it before or had to
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Old 03-27-2012, 07:37 PM
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I have tried it, and it cranks longer than 15 sec...
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