Builds The Architect's '77 FJ40 (1 Viewer)

[wngrog]

Two questions.
On the floor mat. Did you wind something that will make it softer? Soak in hot water?

Second, the single line. Is that the corvette regulator Cam came up with? I have not seen one installed yet.

 

[GA Architect]

Two questions.
On the floor mat. Did you wind something that will make it softer? Soak in hot water?

Second, the single line. Is that the corvette regulator Cam came up with? I have not seen one installed yet.

The floor mat was installed during Summer, and I laid it outside in the GA sun for a few days before the install.

Fuel filter regulator with return: Yes, this is the Corvette filter. Cam ( @FJ60Cam ) sent it to me to try out. Thus I only have to run his single supply hard line. The return hard line is hanging on my shop’s wall.

 

[GA Architect]

My rig was on a Petrol IV drip yesterday till I got home......

Finished installing the Corvette filter/regulator last night. Had to cycle the pump a few times to fill the new hard line, but fired up and took it for a midnight ride!

 

[GA Architect]

"Houston, we have a problem!"

Bummer! Initially thought it was the O-ring, but it's a cracked return cover.......patiently waiting for another that should be here soon.

 

[Steamer]

Yikes! dripping onto the exhaust manifold could of been a much bigger bummer.

 

[GA Architect]

Temporary replacement parts have arrived.

Now to get them installed so the Sniper can get back to learning.
Note, the Sniper 2300 must the hot "Ticket" item for Holley these days, it is on back order already.

 

[Steamer]

Now to get them installed so the Sniper can get back to learning.

The Sniper learning is easy. It's my head learning that needs help.

 

[GA Architect]

With the new part installed and no leaks after a few test drives, my rig is back on the road!

Shout out to @FJ60Cam for the Service & all the help! It pays to purchase these types of items from a MUD member.

 

[GA Architect]

..........trying to work thru some stalling issues. Before my 2F comes up to 160 degrees, it will stall while coming to a stop sign or red light. It's no fun having to crank my rig a few times going to and coming from work.

 

[wngrog]

..........trying to work thru some stalling issues. Before my 2F comes up to 160 degrees, it will stall while coming to a stop sign or red light. It's no fun having to crank my rig a few times going to and coming from work.

I’m sure you talked to @FJ60Cam but he coached through a guy with that issue on the Delta Beast

What is your idle?

 

[Steamer]

I’ve always thought it would be nice if someone started a thread dedicated to “Sniper Tuning”. I just think it would be helpful to have all the Sniper tuning problems, cures and settings shared in one thread. Just a thought.

 

[GA Architect]

I’m sure you talked to @FJ60Cam but he coached through a guy with that issue on the Delta Beast

What is your idle?

Once it is warmed up, it idles around 700 just fine and runs smooth as butter. My issue only presents itself from a cold start until the engine gets to about 160 degrees.

 

[DangerNoodle]

Once it is warmed up, it idles around 700 just fine and runs smooth as butter. My issue only presents itself from a cold start until the engine gets to about 160 degrees.

Sounds like it's running lean.

 

[GA Architect]

I’ve always thought it would be nice if someone started a thread dedicated to “Sniper Tuning”. I just think it would be helpful to have all the Sniper tuning problems, cures and settings shared in one thread. Just a thought.

Funny you mentioned that. I have read more Sniper threads on the Holley forum, than books I've read in my life time. (Which isn't saying much!) I also found three or four threads on the Holley forum about this exact issue, but none of the threads have a resolution.

 

[Steamer]

Funny you mentioned that. I have read more Sniper threads on the Holley forum, than books I've read in my life time. (Which isn't saying much!) I also found three or four threads on the Holley forum about this exact issue, but none of the threads have a resolution.

Yup, spent a lot of time there. Good info and knowledgeable people but the vehicles and applications are so diversified it can get very tedious finding a solution. I just thought a thread here on Mud being mostly Fs and 2Fs would eventually develop into a very useful info source for us guys. All in one thread might get more attention & particiapation from the gurus here also.
The only setting I've changed is "fuel prime". It always started right up but if it sat for more than 4-6 days, it only started on the second cycled try. With "fuel prime" increased to 150, it starts right up after sitting a few weeks.
I got side tracked with other stuff so I'll soon be getting back to some fine tuning.

 

[FJ60Cam]

I’m sure you talked to @FJ60Cam but he coached through a guy with that issue on the Delta Beast

What is your idle?

We talk enough that my wife thinks I’m hiding a girlfriend

Sounds like it's running lean.

Rick’s settings, as I believe they came from the factory, and as they were while having problems:

I recommended leaning the idle (it was spitting soot on his garage wall) to 14/low 14s, as well as bumping the WOT up to the low 13s (suggest dialing that in later). Not sure he’s done any test drives after that. These do work for him while it’s warm.

Other recommendations I’ve given so far:

-change the cam setting to something more aggressive (another person had luck with this, did not seem to make a difference in Rick’s case). The thought being it doesn’t rely on manifold vacuum readings as much at idle. After more research, I’m not sure that’s what this setting changes, or what it changes.

- increase the IAC rampdown time, which should give it more hang time after letting off the throttle. (Factory setting is 4 secs, I think we’re at 6 now). I’ve had success with this before.

-setting the idle speed via the throttle butterflies at or slightly above the computer idle speed to have a warm IAC reading of zero. Current warm IAC is ~3%, which is usually perfect. (Videos of the issue occuring all have high IAC readings, which is expected when cold).

-adjust driving style when cold to avoid sharp revs w/abrupt throttle let-off. Use engine braking to help tame the stalls.

If Rick or I has time tomorrow we can post action videos of the screen during the event.

I’m thinking the big change in manifold vacuum when cold & not under load is catching the system off guard and it goes into a death wobble until it stalls.

You can watch big swing in vacuum as he lets off the throttle, and then see the IAC try to open wide as the rpms drop, while AFR rapidly fluctuates to adjust, then the IAC fluctuates to adjust to the AFR, which fluctuates with the IAC, which.... death wobble

My other thought is that this could just be an effect of a cold carb manifold. Seems like there should be a way to tune this out though.

Rick, if I’ve left any details out, please fill them in.

If anyone has any ideas, we’d both appreciate it!

 

[ebertotti]

I had the same stall issue and also manually set the target AFRs based on reading previous threads. Out of frustration and multiple manual AFR configurations I did a factory reset and let the Sniper relearn my engine. It again initially had the same stall problems but after driving for several days the problem surprisingly dissipated to point where now it's a rare event.

 

[GA Architect]

I had the same stall issue and also manually set the target AFRs based on reading previous threads. Out of frustration and multiple manual AFR configurations I did a factory reset and let the Sniper relearn my engine. It again initially had the same stall problems but after driving for several days the problem surprisingly dissipated to point where now it's a rare event.

OH MY! Pardon my ignorance, is there a factory reset? If so, how did you go about resetting it?.....I've made so many different changes to this/that/& the other on my Sniper EFI, that I'm sure I've lost most of the factory settings.

 

[ebertotti]

OH MY! Pardon my ignorance, is there a factory reset? If so, how did you go about resetting it?.....I've made so many different changes to this/that/& the other on my Sniper EFI, that I'm sure I've lost most of the factory settings.

To perform a factory reset just run the Sniper Wizard as if it's a new install. I was in the same boat as you regarding my custom settings that i'm sure I conflicted it somehow. I just punted and started from the beginning.

 

[GA Architect]

Thread Note about how I got to where I am today with my HolleySniper:

When I originally installed my Sniper, I used the rubber fuel supply and return lines supplied. Also, I installed the pre-filter/fuel pump/post filter as what would typically come in the Sniper Master Kit. At this time, I set up the Sniper Wizard per the instructions. Cycled the key, and on the second crank it fired up. I drove my rig this way for a few hundred miles, and don't recall having stalling issues during that initial drive time.

A few weeks later, the hard lines come in. But also arrives was and additional item, a Corvette Fuel Filter/Regulator to try. So off with the rubber supply & return lines across the front of my engine, as well as the post filter. In goes the new filter/regulator & hard supply line to the Sniper and a fuel return cap. After two trips with this new setup, I smell the distinctive aroma of raw gas. Open the hood, and there is a pool of gas sitting on the heat shield below the return cap. Thinking it was an O-ring that has gone bad, a new one was sent and installed. Backed my 40 out of the shop, opened the hood to check that all is well...........and it wasn't. I could see gas seeping out of the fuel return cap onto the heat shield again, so back into the shop it goes. I take a video of the return cap before I shut it down and notice bubbling coming from near a bolt. Take the return cap off, and find the hairline crack. So a new return regulator cap was needed. Holley sends a new one quickly, albeit from a different Sniper model. But happy to have what I have, I install it. Backed it out of the shop, leaking gas problem solved, Happy-Happy I was. So for the next week or so I DD my rig almost every day, but a Stalling issue arises. It starts stalling at the end of my 1/3 mile driveway, and then about a 1/2 mile later at a Stop sign. This happens when I let off the gas, applying the clutch with the left foot and brake with the right, and all before the 2F gets above 160 degrees. Over the past week or so, at the advise of my Sniper suppler, we have tried a multitude of adjustments.....but the stalling still occurs.

Alright, one thing I didn't do when I went to the single supply line was reset my Sniper's Wizard. Thinking that maybe the few hundred miles with a two line system my Sniper learned, wasn't letting the new single line system overcome the original mapping?.....(Yeah, maybe I'm reaching here?)....So I went into the Wizard last night and reset all the original parameters. I'll update my progress as I will be trying to DD my rig here soon.