Duramax Diesels Forum Truck of the Week
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Old 09-16-2018, 10:07 AM
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Default Airdog 165 pressure

Ok installed it when I did my injectors about a month ago. First primed start up I had 12.5psi got the p0089 code. Erased it and lasted bout a week before it came on. Now my pressure has raised to 15psi and I get the code every could of days. Is it normal for the pressure to raise by itself? And what should the pressure be at? With code active, truck run perfectly normal, I just have the mil light on. I've been searching and can't find anything about the pressure rising by itself.
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2001 GMC Sierra 2500HD SLE EC/LB 4x4
LDS 45% SAC injectors
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Old 09-16-2018, 10:19 AM
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You can adjust the pressure. There is a screw on the side of the airdog, turn it down until you get the pressure you want
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Old 09-16-2018, 10:20 AM
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Try dropping it to 10 psi and see if that helps. A little above that and some will start to have rough idle or codes, etc. Unless tuned for the higher pressure. Then when you get closer to 20 psi you start to risk leaking from the fcim
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Old 09-16-2018, 10:28 AM
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Fuel temp plays a role in pressure.
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Old 09-16-2018, 02:07 PM
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Quote:
Originally Posted by Ne-max View Post
Fuel temp plays a role in pressure.
Yeah I noticed that today. 15psi first start up, once warmed up it dropped to 13.5-14psi. it runs great at that pressure. No rough idle, no noises just the damn light. Also when I go full throttle it drops to roughly 9-10psi. Will dropping the pressure to 10 at idle hurt the top end performance?
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2001 GMC Sierra 2500HD SLE EC/LB 4x4
LDS 45% SAC injectors
Airdog 4G 165 lift pump
Cold air intake
4" straight exhaust 6" tip
PPE boost valve
Glowshift gauges
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Old 09-16-2018, 02:11 PM
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Quote:
Originally Posted by Philv View Post
Yeah I noticed that today. 15psi first start up, once warmed up it dropped to 13.5-14psi. it runs great at that pressure. No rough idle, no noises just the damn light. Also when I go full throttle it drops to roughly 9-10psi. Will dropping the pressure to 10 at idle hurt the top end performance?
No. As long as you have 1 psi or more you will not loose performance.
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Old 09-16-2018, 02:13 PM
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Quote:
Originally Posted by Ne-max View Post
No. As long as you have 1 psi or more you will not loose performance.
Ok. Can I adjust it while running or does the truck/pump need to be off?
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2001 GMC Sierra 2500HD SLE EC/LB 4x4
LDS 45% SAC injectors
Airdog 4G 165 lift pump
Cold air intake
4" straight exhaust 6" tip
PPE boost valve
Glowshift gauges
Reply With Quote
  #8  
Old 09-16-2018, 02:51 PM
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Yes
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