Placebo Effect?
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Senior User
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From: Knoxville, TN
Placebo Effect?
I just got finished installing my GPR LED and while i was crawling around under the hood, I figured I'd go ahead and delete my AIH. After all was finished, I started the truck and I swear it idles smoother. Is it just in my head?
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From: Knoxville, TN
By the way, I know everybody says to get the drain plug for a 5.9 cummins to do the AIH delete but I found one that is MUCH easier if you plan to drill and tap it for a boost gauge. Get a drain plug for a 1995 BMW M3. It is the same thread (M22X1.5) and it has a 3/4" head on it. The cummins plug has a socket head and is just round, so it can't be drilled and tapped as easily.
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From: Hampton, Maryland.
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Just an FYI with the AIH delete you will get a p0541 code. I think on most vehicles it doesn't set the CEL just a soft code. You can get a 470 ohm 1/2 watt resistor from radio shack to eliminate the code. They came in a pack of five. I used 4 of them to get a little higher watt rating like some suggested (pic of how I wired them below). That gives you the same as a 470 ohm 2 watt resistor which you can't find at radio shack. You just run it from the output of the AIH (the one with the blue wire on it) to ground. I just used the ground from the AIH delete and spliced the resistors into it and put some heat shrink wrap over the resistors.
Post Fiend
Joined: Sep 2003
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From: Mesa AZ
To the OP, sounds like a practical solution. Is the drain plug milled away between the base of the head and the threads? If so, you need to be careful not to over tighten or the head will twist off. If you used anti seize on the threads then you should be able to remove it later if the need ever arises.
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From: Knoxville, TN
It is a Dorman part# 65223. I took it to work and cut off about half of the threads and drilled and tapped it for future use as a boost gauge connection. I 'm a machinist so I get to cheat and use lathes and such!Greg, I'm not sure if you are asking about a thread relief at the shoulder or not, but there is no relief. You can see a pic of the plug on the Advance website.
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Post Fiend
Joined: Sep 2003
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From: Mesa AZ
Yes, I think that is what it is probably called. The plug for our '87 had the relief and it was hollow so the head would twist off real easy. Almost seems like BMW designed them to break away like that...must be why Advance has them so cheap. Cool idea!
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From: Knoxville, TN
Merry Christmas!
Tuned
Joined: Jan 2004
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From: Jamestown, TN
Just an FYI with the AIH delete you will get a p0541 code. I think on most vehicles it doesn't set the CEL just a soft code. You can get a 470 ohm 1/2 watt resistor from radio shack to eliminate the code. They came in a pack of five. I used 4 of them to get a little higher watt rating like some suggested (pic of how I wired them below). That gives you the same as a 470 ohm 2 watt resistor which you can't find at radio shack. You just run it from the output of the AIH (the one with the blue wire on it) to ground. I just used the ground from the AIH delete and spliced the resistors into it and put some heat shrink wrap over the resistors.
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From: D'Hanis, TX
FYI, I'm a Registered Professional Engineer + a Ham Radio Operator. Been doing electronics work for 55+ years.
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From: La La Land
Perfectly explained.
Series/parallel isn't rocket science, just math....
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