What is your experience with Holley Sniper TBI?

All good, I didn't take it that way and will NEVER say I'm above making mistakes. I'm pretty convinced that after all the troubleshooting and parts swapping I did, it was just a bum unit. It happens. If something else on the car was causing the issues, it only caused issues with the Sniper unit. All the same parts are still on it now. Doesn't make you feel any better after spending over a grand on the whole setup, plus all the other parts I changed out, but that's life and the stuff I swapped is better than the stuff I had.

To your point, I've also gotten bad carbs out of the box. Had a Holley 670 Street Avenger that had a flaw in the casting process that caused the insides to quickly corrode when exposed to fuel, thus clogging up all the internal passages. I emailed Holley about it and they asked me for the serial number. They admitted the issue, going so far as to actually recall a whole batch of carbs. They sent me a brand new carb, and a shipping label to send the bad one back. This is why I still buy from Holley, but I am of the opinion that they knew a lot of the early Sniper units had problems.

 

One thing people who are installing these systems need to understand is wiring and proper wiring routing. There are basically 2 classifications of wires in the system, power and signal. Power is just what it says. These are the wires that power the unit and maybe the ignition, depending on your application.

Signal wires are small wires that carry very low current signals that are measured in milliamps, 1/1000 of an amp. These wires must NOT be routed anywhere near a spark plug wire, coil wire or other noisy electrical component. If they are, there will be small currents induced on the signal wires that will confuse the CPU. This is non negotiable. It must be adhered to if you want a properly functioning system.

Lastly, are ground wires and they should be grounded as per the instructions, usually directly to the battery.

 

My neighbor has been fighting one for over 3 yrs now, 2 different vehicles and it won't run right on either, they can get it to idle but nothing else. On the phone with Holley tech more times than you can count and they can't figure it out either.
The dad wants to shit can it for a regular carb and ignition like they did on the first vehicle they tried it on, the kid is to hard headed to give in. In the meantime they've lost 2 yrs of driving a nice looking lowered 454 SS pickup.

 

Being 2 Years , out of warranty now ,
Give them the advice to pull & send in have it checked ,,
When it comes to items like this ,
""BUY /Purchase"" straight form Manufacture,, IF Manufacture has Direct purchase option ,,,, So you are not the 3rd party , & DO NOT buy USED unless you Know system has NO Issues !!!

 

Good to know it may take 500 miles for it to learn and get better. I am at about 130 miles and I can see a big difference from when I first installed it.

 

We put one on my son's Valiant runs and idles pretty good, probably have 100 miles on it. Only issue is if for some reason when cranking the voltage goes below 12 it will not start. Pretty sure it's preventing starting even at like 12.9. I've heard there is an update but haven't had time to research if there is and how to get it.

 

I will say both times I went to your house though I saw right away it was efi both guys I rode with were duped into thinking it was carved lol

 

I have my first 100 miles on the PU's sniper and I have nothing but good things to say so far. After reading some of the posts I am looking into software for my laptop to make sure I tweak all the potential out of the system.

 

Software is free. Download it from Holley site. Watch some YouTube videos to learn how to use it.

 

I’ll do it this evening. Wife took ill so I need something to do anyway.

 

Hope it's nothing serious.

 

Holley has some very good starter videos on YouTube, plus there are other guys who have learned a lot and share their information on tuning.