Engine run-on with sniper efi

[Slowpoke86]

Good to know. We never got to fir up last week. Trying again tomorrow. Of course, there's no gas to put in it, so that may delay things further.

Yeah the gas thing is a pain. South Florida isn't really dealing with no gas as much as dumb people. Everyone here was filling up like we had a Cat 5 hurricane coming yesterday and emptied a lot of the stations but they're all full today. We get out fuel from our port and not the pipeline but common sense ain't so common anymore.

If you have any questions feel free to ask. I honestly don't think you will have a problem.

 

[fleming442]

Yeah the gas thing is a pain. South Florida isn't really dealing with no gas as much as dumb people. Everyone here was filling up like we had a Cat 5 hurricane coming yesterday and emptied a lot of the stations but they're all full today. We get out fuel from our port and not the pipeline but common sense ain't so common anymore.

If you have any questions feel free to ask. I honestly don't think you will have a problem.

Well, my dumba$$ had the oil pressure safety switch wired backwards, because I couldn't read the terminals under the car. Took me a minute to figure out why the starter ran in the ignition position! D'oh!!! I've checked the fuel and fan relays, already; they're good, and the handheld lights up (in ignition, now).

 

[Slowpoke86]

Well, my dumba$$ had the oil pressure safety switch wired backwards, because I couldn't read the terminals under the car. Took me a minute to figure out why the starter ran in the ignition position! D'oh!!! I've checked the fuel and fan relays, already; they're good, and the handheld lights up (in ignition, now).

🤣🤣 That's ok I was over here this morning trying to figure out why my gas gauge ain't working with the new efi tank. 3 hours dropping the tank testing everything I could with the multi meter just to find out my dumbass needed more gas 🤣🤣🤦‍♂️🔫

 

[64nailhead]

So you can download a Global Config File with this and change fuel, timing & whatever tables are available, correct?

The one wire alternator and EFI has been known to cause issues. Megasquirt manuals have instructions that include 'do not use' them. It's easier to have a charge and exciter wire - backfeeding is a SNAFU. Holley has a more robust ground protection from my understanding.

Any chance you want to share your GCF?

 

[Slowpoke86]

🤣🤣 That's ok I was over here this morning trying to figure out why my gas gauge ain't working with the new efi tank. 3 hours dropping the tank testing everything I could with the multi meter just to find out my dumbass needed

Slowpoke86 I saw your thread on the Holley forum. Did you find a solution to your "run on" problem? If so, what was the ultimate fix? Did you install the diode on your internally regulated alternator?

Another heads up on the install. While everything is cold turn key on and match the MAT temp with the CTS temp. Holley is known for bad temp sensors . The sensor holley sent me was 19° off . I went a bought a Delco from Oreillys and now the Temps are 1° difference

 

[Slowpoke86]

So you can download a Global Config File with this and change fuel, timing & whatever tables are available, correct?

The one wire alternator and EFI has been known to cause issues. Megasquirt manuals have instructions that include 'do not use' them. It's easier to have a charge and exciter wire - backfeeding is a SNAFU. Holley has a more robust ground protection from my understanding.

Any chance you want to share your GCF?

I'm not sure about the sharing the GCF. Not that I don't want to just that I don't know how yet. I'm new to all this and learning as I go. From what I gathered about the back feed was because the Sniper and ignition box are directly + - to the battery and from a holley tech to my ears it only takes about a ½ volt to power the trigger wires. The combo of direct power from batt and minimal power to keep the triggers on is the reason it ran-on. The stock hei system isn't direct to a power source so when the key is off the residual power don't effect it. I'm not sure if that makes sense or not.
I will look into the GCF and get back to you on that.

 

[JAMCAR223]

Another heads up on the install. While everything is cold turn key on and match the MAT temp with the CTS temp. Holley is known for bad temp sensors . The sensor holley sent me was 19° off . I went a bought a Delco from Oreillys and now the Temps are 1° difference View attachment 175341

Could you please post the Delco part# you purchased from O'reilly. I have the Holley temp sensor in my cart, and would like to avoid any potential issues with their sensor. Thanks!

 

[Slowpoke86]

Could you please post the Delco part# you purchased from O'reilly. I have the Holley temp sensor in my cart, and would like to avoid any potential issues with their sensor. Thanks!

Yes sir here you go. I believe it was $23.99.
Part # Delco 213-928

 

[64nailhead]

Yes sir here you go. I believe it was $23.99.
Part # Delco 213-928

For a MAT sensor you ought to use an open air temp sensor.

GM IAT Sensor with open element & pigtail

IAT Sensor (Intake Air Temperature) with Open Element, GM Style 6" Pigtail; Fast-Response Intake Air Temp Sensor for forced induction

www.diyautotune.com

The normal Delco 213-928 is for coolant or oil. It will work =, but the heat soak will hurt on hot start ups if it's anywhere above the intake.

 

[Slowpoke86]

For a MAT sensor you ought to use an open air temp sensor.

GM IAT Sensor with open element & pigtail

IAT Sensor (Intake Air Temperature) with Open Element, GM Style 6" Pigtail; Fast-Response Intake Air Temp Sensor for forced induction

www.diyautotune.com

The normal Delco 213-928 is for coolant or oil. It will work =, but the heat soak will hurt on hot start ups if it's anywhere above the intake.

I'm not 100% sure what your are talking about. The MAT is built into the sniper unit itself . The coolant sender holley sends is 20° off actual temp. I was letting him know to test the coolant temp sensor and replace before start up if not in spec of the MAT.