Holley Sniper EFI on 401

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KJ Ryu
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Holley Sniper EFI on 401

Postby KJ Ryu » Sat Jul 01, 2017 5:22 pm

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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Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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tedlovesjeeps71
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Re: Holley Sniper EFI on 401

Postby tedlovesjeeps71 » Sat Jul 01, 2017 5:31 pm

Congrats man! Must have been a good day for fuel injection.
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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KJ Ryu
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Re: Holley Sniper EFI on 401

Postby KJ Ryu » Sat Jul 01, 2017 5:36 pm

:D possibly. Let me know if you figure it out. For the moment, I can live with it.
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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Tatsadasayago
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Re: Holley Sniper EFI on 401

Postby Tatsadasayago » Sat Jul 01, 2017 6:32 pm

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.
1977 Cherokee Chief - The Blair Jeep Project III
A collection of parts flying in close formation

FSJ Guy
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Re: Holley Sniper EFI on 401

Postby FSJ Guy » Sat Jul 01, 2017 6:38 pm

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!!
Ethan Brady

http://www.bigscaryjeep.com

1987 Grand Wagoneer. Slightly longer than stock.

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Tatsadasayago
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Re: Holley Sniper EFI on 401

Postby Tatsadasayago » Sat Jul 01, 2017 6:51 pm

My bad, I got it backward. Wide open throttle stops almost all fuel flow until the engine starts. Makes total sense.
1977 Cherokee Chief - The Blair Jeep Project III
A collection of parts flying in close formation

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Tatsadasayago
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Re: Holley Sniper EFI on 401

Postby Tatsadasayago » Sat Jul 01, 2017 6:54 pm

Yes, without a CTS signal, the system thinks it's -40. Sorry for sharing bad intel.
1977 Cherokee Chief - The Blair Jeep Project III
A collection of parts flying in close formation

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KJ Ryu
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Re: Holley Sniper EFI on 401

Postby KJ Ryu » Sat Jul 01, 2017 8:01 pm

Can anyone find a socket to fit that plug, though? I'll probably just go machine some 4340 tomorrow....
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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tedlovesjeeps71
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Re: Holley Sniper EFI on 401

Postby tedlovesjeeps71 » Sat Jul 01, 2017 8:15 pm

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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KJ Ryu
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Re: Holley Sniper EFI on 401

Postby KJ Ryu » Sat Jul 01, 2017 8:34 pm

Coolant port in the intake. Tapered pipe thread with square hole.

Image
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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tedlovesjeeps71
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Re: Holley Sniper EFI on 401

Postby tedlovesjeeps71 » Sat Jul 01, 2017 8:39 pm

Should be able to use a 3/8 ratchet (or extension), no???


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KJ Ryu
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Re: Holley Sniper EFI on 401

Postby KJ Ryu » Sat Jul 01, 2017 8:41 pm

No, it's 5/16" square. :(
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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KJ Ryu
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Location: Casper

Re: Holley Sniper EFI on 401

Postby KJ Ryu » Sat Jul 01, 2017 8:42 pm

Tried grinding down a 3/8" extension, just kept breaking the tip off of it.
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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tedlovesjeeps71
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Re: Holley Sniper EFI on 401

Postby tedlovesjeeps71 » Sat Jul 01, 2017 8:53 pm

Hmm.. that's weird. How about an EZ out??


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KJ Ryu
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Re: Holley Sniper EFI on 401

Postby KJ Ryu » Sat Jul 01, 2017 9:41 pm

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.
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

FSJ Guy
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Re: Holley Sniper EFI on 401

Postby FSJ Guy » Sat Jul 01, 2017 9:57 pm

In the meantime, spray the hell out of it with PB blaster!
Ethan Brady

http://www.bigscaryjeep.com

1987 Grand Wagoneer. Slightly longer than stock.

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az chip
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Re: Holley Sniper EFI on 401

Postby az chip » Mon Jul 03, 2017 12:34 pm

Try a 3/4 drive ratchet.


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'81 Cherokee Chief 81 WT Chief/MSD 6/ Rusty 4" Spring lift/ Bulltear oil adapter/K&P Engineering Oil Filter/ NP 208/ Serehill Light Harness/ H4 Headlights/ Evil Twin Fab Luggage rack and sliders/ Ross mirror mounts.

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Re: Holley Sniper EFI on 401

Postby BCRAWLER » Mon Jul 03, 2017 1:26 pm

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.
1980 Cherokee,360/727/208, propane powered,unknown lift,31' Adventuro's on Chevy rims,Warn winch

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KJ Ryu
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Re: Holley Sniper EFI on 401

Postby KJ Ryu » Mon Jul 03, 2017 3:45 pm

Got bored today so I came up with my own tool. RIP: 14x2mm tap:

Image

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

Image

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

Image

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.
Ron

2005 KJ, Hit-n-Run, 2am 6-17-2012, Totaled. :mad:
1977 SJ J10, 2v304, T18, D20, 37x14s, SOA & SF on tons, still ugly. not running
1978 SJ Wagoneer, 4v360, QT, 33x12.5s, lift by Sawzall :-bd NOT Running :(
1977 SJ J10, SniperEFI 401, QT, D44s, 31X10.5s, DD! :fsj:

Mars wrote:One man's trans leak is another's penetrating oil :D

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tedlovesjeeps71
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Re: Holley Sniper EFI on 401

Postby tedlovesjeeps71 » Mon Jul 03, 2017 4:42 pm

Congrats man!!!


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