Holley Sniper EFI install on my 258

Mancunian

Basic User
City
Bridgeport
State
WV
#21
How did you wire the Sniper to the HEI? i see a yellow wire - so i think you are not controlling timing.

What does the log say? The manual seems to say it's possible to trigger a log on certain events.

Check out this link maybe relevant (I have not used these guys but they seem to know what they are doing)

https://www.efisystempro.com/efi-pro-hangout/solving-sniper-rfi-problems

I am in midst of fitting my Sniper - be a while before i can try it though
for reference here's mine - i have the standard intake and the coolant sensor is on the left

Good luck
 

Attachments

Last edited:

walkerhoundvm

Typical Know-it-all
LIFETIME
CJ-8.com Member
City
Cave Creek
State
AZ
#22
It's been a while, but I think there's another plug you can put it in about 12" fore of that rear plug?
 

bigwalton

Picture cravin' AK Postal nut
Staff member
SOA Member
City
Dexter
State
MI
#23
Glad to see it's on and running. Hope the stalling issues work themselves out.
 

tower210

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Olathe
State
KS
#25
Could you mount the temp sensor in the heater hose line? It should flow all the time regardless of t-stat position; might have to build a creative mount....
 

gr8dain

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Ashburn
State
VA
#26
Could you mount the temp sensor in the heater hose line? It should flow all the time regardless of t-stat position; might have to build a creative mount....
I did run the temp sensor in the heater hose. It seems to be working for now.

61D706A2-3411-4025-A2FC-1F5F82A18D4B.jpeg 61D706A2-3411-4025-A2FC-1F5F82A18D4B.jpeg
 

gr8dain

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Ashburn
State
VA
#27
How did you wire the Sniper to the HEI? i see a yellow wire - so i think you are not controlling timing.

What does the log say? The manual seems to say it's possible to trigger a log on certain events.

Check out this link maybe relevant (I have not used these guys but they seem to know what they are doing)

https://www.efisystempro.com/efi-pro-hangout/solving-sniper-rfi-problems

I am in midst of fitting my Sniper - be a while before i can try it though
for reference here's mine - i have the standard intake and the coolant sensor is on the left

Good luck
Correct. I am not having the sniper control timing at this point. Holley suggests letting te system do its learning first before having it control the timing.

I will check out that link. Thanks. There is a lot to learn about this system and all it can do.
 

gr8dain

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Ashburn
State
VA
#29
It's been a while, but I think there's another plug you can put it in about 12" fore of that rear plug?
Not sure. I will look. But if it is the same size as the one on the rear, the Holley sensor is too wide for it anyway. The Holley temp sensor is a 3/8”.
 

spankrjs

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Biloxi
State
MS
#30
Shouldn't the IAC be controlling the idle? Maybe look at what feedback that sensor is giving to the computer before adjusting the hard idle set screw? On the GM TBI stuff, you can see how many "steps" it is at, see if falls within an acceptable range?

Sometimes, if you adjust the idle screw, the IAC will compensate for what you did, and put the idle back where it was before :twocents:
 

spankrjs

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Biloxi
State
MS
#31
Shouldn't the IAC be controlling the idle? Maybe look at what feedback that sensor is giving to the computer before adjusting the hard idle set screw? On the GM TBI stuff, you can see how many "steps" it is at, see if falls within an acceptable range?

Sometimes, if you adjust the idle screw, the IAC will compensate for what you did, and put the idle back where it was before :twocents:

I was wrong on this set up. I looked at the instructions under Tuning, Throttle Blade Adjustment, allows you to set the idle where you want it. After a re-start, the TPS/IAC re-set. IIRC with the GM TBI, you have to unplug the TPS/IAC, jump two pins at the diagnostic connector, adjust the idle stop screw, then shut down engine, reconnect everything, re-start, to reset the base idle speed. This is much simpler:thumbsup:
 

Belizeit

CJ-8 Member
CJ-8.com Member
City
River Ridge
State
La
#32
Where did you get the fitting for the hose that the sensor screwed into ? Looks like I will need to get one for mine.
 

gr8dain

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Ashburn
State
VA
#33
Where did you get the fitting for the hose that the sensor screwed into ? Looks like I will need to get one for mine.
A friend gave it to me. So I have no clue where he got it. It was probably on his CJ when he got it.
 

gr8dain

Scrambler Junkie
LIFETIME
CJ-8.com Member
City
Ashburn
State
VA
#34
I was wrong on this set up. I looked at the instructions under Tuning, Throttle Blade Adjustment, allows you to set the idle where you want it. After a re-start, the TPS/IAC re-set. IIRC with the GM TBI, you have to unplug the TPS/IAC, jump two pins at the diagnostic connector, adjust the idle stop screw, then shut down engine, reconnect everything, re-start, to reset the base idle speed. This is much simpler:thumbsup:
Yep. Set via the blade setting on thr display.

I did adjust the physical screw. It worked. But maybe too far. So I set it higher a little today.
 
Top