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Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 5:22 pm
by KJ Ryu
Got the Sniper installed, today, sans coolant sensor. I can't get the damn plug out of the intake. Why the hell did Edelbrock use a plug with a 5/16" square hole in it? Who has that socket?

However, even without the system being able to learn, my truck runs better than it has since I bought it. I finally believe what the PO said about 10.5:1 and a cam!

A few minor issues, which I'm sure will sort out once I can get the CTS installed:

First start was beautiful. Let it idle for a few and start warming up. Idle was high so lowered that. Target set at 580 to get 700. Tried the idle screw but couldn't get any lower. I might be doing something wrong. Have to look that procedure up, to see what I'm doing wrong. chevelles.com seems to have the most info, for anyone interested.

Every start since, I have to hold the accelerator to the floor, and let off immediately after I hit start with the key. Pretty sure this is due to not having a CTS. But, if you know something I don't, let me know.

And, the few pics I remembered to get:

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Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 5:31 pm
by tedlovesjeeps71
Congrats man! Must have been a good day for fuel injection. Image
I followed the directions on mine and set it to +\- 500 rpm. When I plug it back in (following the procedures) it ends up at about 700. Maybe we are both doing something wrong?
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Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 5:36 pm
by KJ Ryu
:D possibly. Let me know if you figure it out. For the moment, I can live with it.

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 6:32 pm
by Tatsadasayago
I believe that without a CTS signal, the system assumes a super hot engine temp, thus the need to floor it (Clear Flood) in order to start.

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 6:38 pm
by FSJ Guy
Tatsadasayago wrote:I believe that without a CTS signal, the system assumes a super hot engine temp, thus the need to floor it (Clear Flood) in order to start.
The screen grab shows coolant enrichment at 120% and a richer AFR being commanded. I think the computer is seeing a COLD engine instead. Thus, it's trying to dump fuel in to start a cold engine and that is why the "clear flood mode" procedure is working.

LOL! Good news is, most likely one of us is right! LOL!!

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 6:51 pm
by Tatsadasayago
My bad, I got it backward. Wide open throttle stops almost all fuel flow until the engine starts. Makes total sense.

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 6:54 pm
by Tatsadasayago
Yes, without a CTS signal, the system thinks it's -40. Sorry for sharing bad intel.

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 8:01 pm
by KJ Ryu
Can anyone find a socket to fit that plug, though? I'll probably just go machine some 4340 tomorrow....

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 8:15 pm
by tedlovesjeeps71
KJ Ryu wrote:Can anyone find a socket to fit that plug, though? I'll probably just go machine some 4340 tomorrow....
Which plug is it? Got a pic??


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Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 8:34 pm
by KJ Ryu
Coolant port in the intake. Tapered pipe thread with square hole.

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Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 8:39 pm
by tedlovesjeeps71
Should be able to use a 3/8 ratchet (or extension), no???


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Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 8:41 pm
by KJ Ryu
No, it's 5/16" square. :(

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 8:42 pm
by KJ Ryu
Tried grinding down a 3/8" extension, just kept breaking the tip off of it.

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 8:53 pm
by tedlovesjeeps71
Hmm.. that's weird. How about an EZ out??


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Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 9:41 pm
by KJ Ryu
FSJ Guy wrote:
Tatsadasayago wrote:I believe that without a CTS signal, the system assumes a super hot engine temp, thus the need to floor it (Clear Flood) in order to start.
The screen grab shows coolant enrichment at 120% and a richer AFR being commanded. I think the computer is seeing a COLD engine instead. Thus, it's trying to dump fuel in to start a cold engine and that is why the "clear flood mode" procedure is working.

LOL! Good news is, most likely one of us is right! LOL!!
Thanks! Went and dropped the start-up enrichment. Seems to be the right direction. Got a couple restarts out of it that didn't require messing with the pedal.

As for the plug, I'm gonna make a tool, first. I work on a CNC mill that doesn't have anything to do until Wednesday, and they trust me with a key to the building. If 4340HT isn't strong enough; easy-out, even heat may come into play.

Re: Holley Sniper EFI on 401

Posted: Sat Jul 01, 2017 9:57 pm
by FSJ Guy
In the meantime, spray the hell out of it with PB blaster!

Re: Holley Sniper EFI on 401

Posted: Mon Jul 03, 2017 12:34 pm
by az chip
Try a 3/4 drive ratchet.


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Re: Holley Sniper EFI on 401

Posted: Mon Jul 03, 2017 1:26 pm
by BCRAWLER
What I used was a large Bolt and ground down the shaft to fit it and I put two nuts on the threaded piece and use the lower nut to back it out. It is actually a plug usually used by plumbers so I think a plumber shop should be able to assist you.

Re: Holley Sniper EFI on 401

Posted: Mon Jul 03, 2017 3:45 pm
by KJ Ryu
Got bored today so I came up with my own tool. RIP: 14x2mm tap:

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Truck was already partially warm when I first got the sensor installed:

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And after a few hours of driving around town, mostly casually :lol:

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Not sure if Holley changed sources for the coolant sensor but, mine appears to be perfect. Exactly where my engine should be, maybe even hotter than actual.

Very happy, now!!! :-bd Thank you, guys.

Re: Holley Sniper EFI on 401

Posted: Mon Jul 03, 2017 4:42 pm
by tedlovesjeeps71
Congrats man!!!


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