Efi sos! - Team Camaro Tech
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post #1 of 97 (permalink) Old Apr 5th, 19, 10:31 AM Thread Starter
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Efi sos!

I am in need of some advice/help. Here is the story.
I decided to install the Holley Sniper EFI on my 68. Car was running fine with a Holley 780 carb on an Edelbrock RPM intake with RPM heads, and a MSD Ready to Run Distributor. But not being able to leave well enough alone I purchased the Holley Sniper EFI unit which I had heard many good things about. I also purchased the Holley in tank fuel pump/sending unit. This allowed me to not have to run a return line. It's an original big block car so I was able to utilize the existing 3/8" fuel line. This is where the battle began. After draining the tank (almost full) I installed the new pump as shown in the Holley video. It went rather well I thought, so I put the gas back in & turned the key on to see if the fuel gauge was working, it didn't. I called Holley. Their advice was to switch the ground wire with the sending unit wire. This made no sense. After much testing & cursing I drained the tank again and dropped it. Pulled the pump assembly out and manually moved the float. The gauge worked, success. I reinstalled the pump, put the tank back in and added 5 gallons of gas. Turn the key on the gauge didn't work. I then gave it the Fonzie slug & to my surprise the gauge registered. Aha! The float needed to be jostled around a bit to be able to move. I then moved on to the EFI installation. This all seemed to go well. Installed the oxygen sensor but one of the provided clamps for the bung locked up & snapped off when I tried to back the nut off. I called Holley & they said they would end a new one
(I received it two weeks later!). I installed the temp sending unit, this seemed to go well, but after getting everything hooked up, I was getting a LOWErr on the CTS sensor. I called Holley. The Tech told me I probably had a bad sending unit & he would send me a new one. He also told me I could get a duplicate from Autozone which I did. Installed that & it worked great. Tried to start car, but it would turn over & and backfire. I called Holley. The tech said I may not be getting adequate Fuel pressure. I doubted this since I am using the Holley in tank fuel pump made for this system, Still to be sure I ordered a fitting & fuel gauge from Summit. After installation I confirmed that I was getting 60 lbs. of fuel pressure at the throttle body. Car still would not start. I called Holley.The tech reviewed the wiring diagram that I had used & the advised me to use the one that did not utilize the yellow wire coming off of the coil and instead hook up the purple wire from the ECU & hook it up to the gray wire out of the Distributor. I did this & car still wouldn't start. I doubled check the timing & it was correct. I called Holley again. The tech told me to increase the fuel prime level from 150 to 200. I did. Car started! Success! Not so fast. After about 5 minutes the car died. I called Holley. Explained what was going on & he seemed to think it was a loose connection somewhere in the rpm signal. I agree because when I turn the car over there is no RPM reading on the LCD screen. I have checked all connections & they seem fine. The car has started a few times & runs for a few minutes, but then dies. I am at my wits end. I think this system is beyond my capabilities. I am done with calling Holley. Hopefully my Camaro compadres have a solution. Does anyone know of a person in the Las Vegas area with Holley Sniper experience that makes automotive house calls?
PS the weather in Vegas right now is great. I should be driving my car & on top of all this it's my birthday! Any help or advice would be greatly appreciated.

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post #2 of 97 (permalink) Old Apr 5th, 19, 01:00 PM
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Re: Efi sos!

Milt, Happy Birthday!
I thought these EFI conversions were foolproof? Hopefully you get some good advice for your B-day and will be back on those smooth roads soon!
Best,
Tom

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post #3 of 97 (permalink) Old Apr 5th, 19, 01:13 PM Thread Starter
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Re: Efi sos!

I sure hope so. It's killing me that I can't drive during the best time of the year here.

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post #4 of 97 (permalink) Old Apr 5th, 19, 01:20 PM
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Re: Efi sos!

Milt - are you using the Sniper for timing control as well or leaving it as-is? Sounds like you have possibly narrowed it down to RMP signal as you should see RPM during cranking.
The yellow wire should connect to coil negative assuming conventional coil or the TACH connection of an HEI type distributor. The green & purple wires that are are only used if you have a CD box such as an MSD 6AL so if you are using these and do not have a CD box then what Holly told you is wrong. See page 13 of this manual.
If you get it wired like this diagram shows and timing is correct and you have 60psi of fuel pressure it should fire right up.
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post #5 of 97 (permalink) Old Apr 5th, 19, 06:21 PM Thread Starter
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Re: Efi sos!

Thanks for the advice Travis. The Holley tech told me that my distributor (MSD RTR model 8360) had the equivalent of a CD box inside. Prior to that I hooked up the yellow wire to the negative side of the coil, but I did choose CD box on the set up menu as I was advised by Holley. It would not start in that configuration. I am really at a loss as to what to do next

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post #6 of 97 (permalink) Old Apr 5th, 19, 06:24 PM Thread Starter
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Re: Efi sos!

I am not using the Sniper for timing control.

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post #7 of 97 (permalink) Old Apr 6th, 19, 05:56 AM
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Re: Efi sos!

I think this distributor (8360) does function similar to a CD box in that it jumps the spark voltage that is sent to the external coil where as a points type distributor or other does not. In the instructions Holly states

"WARNING! Do NOT use this input if you are using an aftermarket Capacitive Discharge (CD) ignition system such as a MSD, Mallory, or others. The ECU will be damaged if you connect to a capacitive discharge type ignition coil."

Its possible the Sniper ECU is damaged.
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post #8 of 97 (permalink) Old Apr 6th, 19, 12:49 PM Thread Starter
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Re: Efi sos!

I called Holley this morning and the tech had me run a system log. I started the car and initiated the log. Car ran for about five minutes then died suddenly. I sent the data log into Holley and called back. In analyzing the log the tech said everything in regards to the Sniper was working perfectly, then there was a RPM signal loss and the Sniper shut down.

He believes the problem is ignition related. I'm running a MSD RTR 8360 with a MSD Blaster SS coil. He suggested I call MSD and see if they can troubleshoot the problem. I told him everything was running fine prior to installing the Sniper.

He said it could have been having momentary dropouts and that would not affect the carb as it does the EFI. This seems to make sense to me, but I have very few miles on this distributor. Thoughts?

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Last edited by 69-Pace; Apr 6th, 19 at 01:18 PM. Reason: filled in a few missing letters :)
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post #9 of 97 (permalink) Old Apr 6th, 19, 01:28 PM
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Re: Efi sos!

MSD has had some bashing in recent years to the longevity of coils and other components, and a few members here have had issues with relatively low mileage units going tit's up all of a sudden so it is entirely possible that the tech is right that under the old style carburetor world you never noticed a stumble, but in the digital world it stalls.

But generally the Ready to Run product line is a solid unit. You may just inspect all your wiring for anything a bit dodgy and after the search and destroy see if the issue goes away. The MSD Blaster SS coil on the other hand has some negative posts here and in google searches, and on the Holly forums referring to overheating and burnout issues. https://forums.holley.com/showthread...mp-Burning-Out


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post #10 of 97 (permalink) Old Apr 7th, 19, 09:33 AM Thread Starter
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Re: Efi sos!

Thanks for this info Brian. I pulle the coil and tested it. There was .8 resistance between positive and negative. 4.72 K between positive and coil output. Going to reinspect wiring between ignition and the efi, but there is not much to look at there.

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post #11 of 97 (permalink) Old Apr 7th, 19, 10:40 AM
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Re: Efi sos!

Holley likes to blame ignition. Its not the coil their talking about they are usually saying its the RPM signal. If the system does not detect RPM it shuts off.

Sounds like it was running fine in open loop before it got to operating temp and went to closed loop/learn

I would run the set up again.

What cam did you select on intitial set up?

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post #12 of 97 (permalink) Old Apr 8th, 19, 08:35 AM Thread Starter
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Re: Efi sos!

Street/Strip

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post #13 of 97 (permalink) Old Apr 8th, 19, 08:41 AM Thread Starter
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Re: Efi sos!

According to the data log the Rpm signal was lost and the efi shut down. What I don't understand is why the rpm signal stopped.

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post #14 of 97 (permalink) Old Apr 8th, 19, 08:47 AM
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Re: Efi sos!

Holley will tell you dirty signal. May need their rpm filter.

https://www.holley.com/products/fuel.../parts/556-150

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post #15 of 97 (permalink) Old Apr 8th, 19, 01:22 PM Thread Starter
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Re: Efi sos!

That came with my Kit. No one from Holley has mentioned installing that into the system. I called MSD this morning & they suggested Starting the car, waiting for it to stall, then pull the coil wire & see if I have spark. If no spark then the problem is in the distributor. If no spark he suggested running yellow wire form efi to - side of coil. I don't think I should do that.

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Last edited by Milt's 68 SS/RS 396; Apr 8th, 19 at 03:22 PM.
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