Holley sniper problems

[POTATO LAUNCHER]

There are tons of options out there for the LS3 injector dimensions

Cool, I think you are on the path to finding an appropriate alternative that will help more than just Cruiser folks with this series of Sniper. I'm not 100% sure but I believe most if not all Snipers use the same injectors? At least the two barrel body type do.

 

[1911]

@thecrazygreek has used the 2GC size Sniper, both small bore and large bore in F and 2F setups; I wonder if those models use different spec injectors than the 2300?

Never mind; from Holley's web site, even the small bore 2GC Sniper has the same 100 lb/hr injectors.

 

[POTATO LAUNCHER]

All good information.
Sorry to hijack the OP's thread with this but I think it's relative to the situation at hand.

 

[Firemedic831]

I myself do not see the injector being the issue. The only thing an injector does is open and close . They don’t open bigger or smaller . How long they are open and amount of fuel pressure will change things for sure . Let’s face it when the sniper works it’s great . They had a ton of little issues with the sniper 1 that they fixed for the 2. And I am sure the 2 will have things pop up also that can be improved upon . Since I switched to the 2 my car runs much better and no issues as of yet

 

[POTATO LAUNCHER]

I myself do not see the injector being the issue. The only thing an injector does is open and close . They don’t open bigger or smaller . How long they are open and amount of fuel pressure will change things for sure . Let’s face it when the sniper works it’s great . They had a ton of little issues with the sniper 1 that they fixed for the 2. And I am sure the 2 will have things pop up also that can be improved upon . Since I switched to the 2 my car runs much better and no issues as of yet

Agreed, but a clogged injector limits the fuel delivery causing issues.
IE fuel starvation. A carburetor will do the same thing.
Simply watching for equal fuel spray on both sides will diagnose an area of concern. If the fuel is the same your problem is somewhere else. If it's not then it's an easily replaced part.

 

[Firemedic831]

Now you got me thinking . On the blue 40 I have it has the gm style ( howel ) efi. I need to see what those injectors are as far as lbs. I do know it’s only like 6-12 psi though something like that

 

[MDH33]

The Aisan carb and no computer gadgetry on my '69 40 runs so well... such a simple setup, perfect, it's a 40. I still don't get why everyone wants to overcomplicate something that works. I can fine tune my carb and timing with a single screwdrover and 12mm wrench.

 

[POTATO LAUNCHER]

The Aisan carb and no computer gadgetry on my '69 40 runs so well... such a simple setup, perfect, it's a 40. I still don't get why everyone wants to overcomplicate something that works. I can fine tune my carb and timing with a single screwdrover and 12mm wrench.

Agreed 100%. This information is for the Sniper guys.

 

[Firemedic831]

The Aisan carb and no computer gadgetry on my '69 40 runs so well... such a simple setup, perfect, it's a 40. I still don't get why everyone wants to overcomplicate something that works. I can fine tune my carb and timing with a single screwdrover and 12mm wrench.

Some of us actually take them off road and in the rocks .

 

[Pighead]

Some of us actually take them off road and in the rocks .

Yes we do.

 

[B y r o n]

I love the old Clifford finned valve cover!

 

[Firemedic831]

Yes we do.

View attachment 3462194

View attachment 3462195

I certainly am not saying you can not wheel with a carb. There were plenty of rigs that have wheeled before EFi And still to this day there are rigs still running a carb . Hell I just took my sniper off and put my carb on and ran the Rubicon. But when you get in the really off camber stuff EFI is much better . Carbs are easy and cheap But when you get into a sketchy situation a carb is not your friend

 

[Catching Neutral]

New O2 sensor installed. Problem solved
Numbers are back in the normal range.
Runs like it did before.

 

[Chungas Revenge]

Good news..!!

Out of uncontrollable automotive curiosity, where is your O2 sensor located? Are you using a heat sink adapter?

New O2 sensor installed. Problem solved
Numbers are back in the normal range.
Runs like it did before.

 

[Chungas Revenge]

Deleted: duplicate post.

 

[Catching Neutral]

Good news..!!

Out of uncontrollable automotive curiosity, where is your O2 sensor located? Are you using a heat sink adapter?

What is a heat sink adapter?

 

[WildernessRimFab]

What a timely thread, my 02 sensor grenaded last week on my way home from work. I was driving down the road and the AFR instantly pegged to 35.6. I turned off closed loop, limped home. I installed a Bosch 17025 O2 sensor last night and it runs better than ever.

Im going to give one of the 02 sensor extenders a try. I went with the Innovate Motorsports 3729 Heat-Sink Bung Extender HBX-1.

Lesson learned... if your AFR spikes to 35.6 for no apparent reason, turn the truck off, turn off closed loop, and limp home.

 

[cruisermatt]

Comparison of the Sniper and LSA injector. Just had to swap the Orings over and perfect fit.

 

[POTATO LAUNCHER]

Thanks for the followup on the suggestions and known parts that work. All excellent information for current and future Sniper owners.

 

[midknightc3]

Reviving this thread as I am having the before mentioned problems with my FJ40, but none of the issues discussed above seem to be helping. Had very similar issues with the Sniper leaning out to ~35% and backfiring previously, but a new O2 sensor fixed the problem. This time around the issue started suddenly one morning on my wife's commute to work and a new O2 sensor has done nothing to rectify the problem. Truck starts and idles great, but when put under load she leans out to ~35%, coughs up a good backfire, then slowly sorts herself out. Happens at low RPM (~1000,1500) pulling away from every stop sign. When cruising, if I go above ~40% TPS she sounds like she's misfiring and looses power until I reduce throttle. I've had similar issues on my FJ60 and never really figured it out, but the 60 isn't this bad. Sprayed an entire can of ether around everything sniper related and I get no RPM change, so I'm confident I don't have any intake or exhaust leaks (this is also true on the 60). When looking down the throttle body at idle both BBL appear to have a nice and consistent spray of fuel floating around the butterfly's so I'm not thinking one injector is failing. Just for kicks I swapped out the Corvette filter/regulator with my spare also with no change.

I ran a log of her miss-behavior on my drive home from a buddies today after failing to stumble upon any fixes, should anyone be willing to download and open a file from a stranger (I would look myself, but I have a Mac so I can't download the app).

Thanks!
Clark