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Sniper EFI bad injector #2932645
06/12/21 10:04 PM
06/12/21 10:04 PM
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Michigan
MarkZ Offline OP
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This season has been [censored]. I'm starting to think this car is trying to bankrupt me.

I've was making timing adjustments and the damn car was running very inconstantly. Sometimes it would idle and start right up. Others it wouldn't start at all or run rough. Entire time I thought I screwed something up with my timing adjustments and was beating my head against the dash. Finally got it running and took it around the block. Got on it a little and it flat out died right in front of my house. Wouldn't even give any indication of starting and was stinking of gas. Check the pressure gauge and it read zero. Should read 50 pounds after the system primes. Tried it again while watching under the hood this time and a geyser of fuel erupts out of the throat of the TBI. Had to get neighbor and his son to help push my car up the drive and into the garage (I live on a hill).

Here is a video of it in action:



I'm assuming the injector is shot. Yes? Anyone familiar with how hard it is to replace it or even where to get one?

I know I'm out the $50 worth of fresh oil in the pan too. Might have the car on the road in time for August at this rate.


1987 Fifth Avenue - 512/518/D60
Re: Sniper EFI bad injector [Re: MarkZ] #2932648
06/12/21 10:08 PM
06/12/21 10:08 PM
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Warren, MI
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Jerry Offline
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fitech has got its share of problems too. should be able to get another injector from holley. any of these cheap efi kits are bound to fail a few times until you get the bugs worked out


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Re: Sniper EFI bad injector [Re: Jerry] #2932656
06/12/21 10:51 PM
06/12/21 10:51 PM
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Texas
GoodysGotaCuda Offline
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Injectors are easy enough to change, you may try the forums or facebook sniper owners group for the part number. I think holley just started selling them al-la-carte.

I had way too many troubles with my Sniper setup.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: Sniper EFI bad injector [Re: Jerry] #2932657
06/12/21 10:55 PM
06/12/21 10:55 PM
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Martinsville, IN
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cdwmotorsports Offline
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Martinsville, IN
Originally Posted by Jerry
fitech has got its share of problems too. should be able to get another injector from holley. any of these cheap efi kits are bound to fail a few times until you get the bugs worked out


Define cheap.... my Sniper kit was over $1500. That's not cheap


eBay-cdwmotorsports
Re: Sniper EFI bad injector [Re: cdwmotorsports] #2932662
06/12/21 11:05 PM
06/12/21 11:05 PM
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Sniper Offline
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Originally Posted by cdwmotorsports
Originally Posted by Jerry
fitech has got its share of problems too. should be able to get another injector from holley. any of these cheap efi kits are bound to fail a few times until you get the bugs worked out


Define cheap.... my Sniper kit was over $1500. That's not cheap


Go with an MPI setup, that'll define the sniper as being cheap

Re: Sniper EFI bad injector [Re: Sniper] #2932668
06/12/21 11:27 PM
06/12/21 11:27 PM
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Michigan
MarkZ Offline OP
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I've got about $1500 tied up into mine between the pump, unit and fittings. It's been on the car for three years now, so well outside warranty. What little I've been able to find it looks like the injectors are proprietary and Holley won't sell them separate. I really don't want to send this back to them for service. Car has been down long enough.


1987 Fifth Avenue - 512/518/D60
Re: Sniper EFI bad injector [Re: Sniper] #2932670
06/12/21 11:42 PM
06/12/21 11:42 PM
Joined: Oct 2005
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Anchorage, Alaska
metallicareload Offline
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Anchorage, Alaska
Originally Posted by Sniper
Originally Posted by cdwmotorsports
Originally Posted by Jerry
fitech has got its share of problems too. should be able to get another injector from holley. any of these cheap efi kits are bound to fail a few times until you get the bugs worked out


Define cheap.... my Sniper kit was over $1500. That's not cheap


Go with an MPI setup, that'll define the sniper as being cheap


iagree

I was gonna post that, but someone who lives in America that owns/knows how to weld aluminum would say how you "only" need to buy the ECU and everything else can be found for free


440, 4-Speed, 3.54
1968, when Dinosaurs ruled the Earth
Re: Sniper EFI bad injector [Re: MarkZ] #2932675
06/13/21 12:09 AM
06/13/21 12:09 AM
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Yeah that looks like one injector is sticking open or something. Could be a wiring issue. Take the sides of the Sniper off and carefully check the connectors. Sometimes the connectors come undone or partially undone so that could be the problem. If it is just the connector then you can snap it back together and be good to go.

You can pop the injectors out and take them to a local injector cleaning service. Around here we have Doctor Injector, not sure what you have back there. I don't remember what the injectors come out of, but they aren't a Holley unique part. They are some sort of production injector.

Re: Sniper EFI bad injector [Re: MarkZ] #2932774
06/13/21 11:59 AM
06/13/21 11:59 AM
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Oregon
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AndyF Offline
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I have spare injectors on hand so if you determine that you have a bad injector just shoot me a PM and I'll swap it out for one of my spares.

Re: Sniper EFI bad injector [Re: cdwmotorsports] #2932852
06/13/21 04:10 PM
06/13/21 04:10 PM
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Morristown Tn.
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71birdJ68 Offline
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$1,500 is cheap compared to what you'd have to pay for each part of a factory set up, plus all the engineering.

Re: Sniper EFI bad injector [Re: MarkZ] #2932996
06/13/21 10:36 PM
06/13/21 10:36 PM
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Nebraska
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4406bbl Offline
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Nebraska
Originally Posted by MarkZ
I've got about $1500 tied up into mine between the pump, unit and fittings. It's been on the car for three years now, so well outside warranty. What little I've been able to find it looks like the injectors are proprietary and Holley won't sell them separate. I really don't want to send this back to them for service. Car has been down long enough.


Did you call Holley? They have always sold single injectors for past systems. Would be good to know if they will not sell them as I would go another direction.

Re: Sniper EFI bad injector [Re: 4406bbl] #2933000
06/13/21 10:42 PM
06/13/21 10:42 PM
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Michigan
MarkZ Offline OP
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Originally Posted by 4406bbl
Originally Posted by MarkZ
I've got about $1500 tied up into mine between the pump, unit and fittings. It's been on the car for three years now, so well outside warranty. What little I've been able to find it looks like the injectors are proprietary and Holley won't sell them separate. I really don't want to send this back to them for service. Car has been down long enough.


Did you call Holley? They have always sold single injectors for past systems. Would be good to know if they will not sell them as I would go another direction.


Not yet. This just happened late Saturday. I'll give them a call tomorrow afternoon and report back.


1987 Fifth Avenue - 512/518/D60
Re: Sniper EFI bad injector [Re: AndyF] #2933001
06/13/21 10:45 PM
06/13/21 10:45 PM
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Michigan
MarkZ Offline OP
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Originally Posted by AndyF
I have spare injectors on hand so if you determine that you have a bad injector just shoot me a PM and I'll swap it out for one of my spares.


I really appreciate that Andy. I'm going to call Holley first and see if they sell them without having to send the unit in.


1987 Fifth Avenue - 512/518/D60
Re: Sniper EFI bad injector [Re: MarkZ] #2933002
06/13/21 10:47 PM
06/13/21 10:47 PM
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MarkZ Offline OP
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Took the injector out tonight and it doesn't look bad. Plug was still fully seated in the injector too.

I'll post back after I hear from Holley tech support tomorrow.

20210613_220456.jpg20210613_220445.jpg

1987 Fifth Avenue - 512/518/D60
Re: Sniper EFI bad injector [Re: MarkZ] #2933035
06/14/21 12:48 AM
06/14/21 12:48 AM
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Maryland
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You cant visually look at an injector and tell if its bad. You probably have some trash in it and its stuck open.
Are you running a proper fuel filter(s) for fuel injection? My bet is dirty fuel caused your problem, not a failed injector.

Re: Sniper EFI bad injector [Re: MoparMike1974] #2933101
06/14/21 09:53 AM
06/14/21 09:53 AM
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Windsor, ON, Canada
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Diplomat360 Offline
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Originally Posted by MoparMike1974
You cant visually look at an injector and tell if its bad. You probably have some trash in it and its stuck open.
Are you running a proper fuel filter(s) for fuel injection? My bet is dirty fuel caused your problem, not a failed injector.

Could you just do a test with a gravity fed push of fuel (or something safer) and activation current applied to the injector? I cannot imagine that wiring one up would be all that difficult...just need the proper harness?

My thinking is: if the injector delivers fuel once activated than it must be something else that's causing the problem.

Re: Sniper EFI bad injector [Re: MoparMike1974] #2933112
06/14/21 10:30 AM
06/14/21 10:30 AM
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Michigan
MarkZ Offline OP
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Originally Posted by MoparMike1974
You cant visually look at an injector and tell if its bad. You probably have some trash in it and its stuck open.
Are you running a proper fuel filter(s) for fuel injection? My bet is dirty fuel caused your problem, not a failed injector.


Yeah, I got the Sniper master kit that included the pump and the pre/post filters. At time of install I also ran all new hardline and made my own pickup with a new sock.


1987 Fifth Avenue - 512/518/D60
Re: Sniper EFI bad injector [Re: Diplomat360] #2933113
06/14/21 10:35 AM
06/14/21 10:35 AM
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I made a homemade injector cleaner years ago. I used one of those pump up garden sprayers, cut the spray nozzle off and hose clamped the hose to the injector input. A couple of jumpers with alligator clips and a battery to cycle the injector. Filled the prayer with cleaner, in this case MEK, pumped it up, opened the injector and let it flow.

Something is making the injector flow. Usually injectors are wired with a constant switched 12v and the ECU cycles the ground. If that ground is shorted then the injector is always on.

Last edited by Sniper; 06/14/21 10:38 AM.
Re: Sniper EFI bad injector [Re: MarkZ] #2933157
06/14/21 11:59 AM
06/14/21 11:59 AM
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Originally Posted by MarkZ
Took the injector out tonight and it doesn't look bad. Plug was still fully seated in the injector too.

I'll post back after I hear from Holley tech support tomorrow.


Since you got that far then just swap the suspected bad injector with the one next to it and try it. The problem will either follow the injector or it will stay with the throttle bore. If the problem stays with the throttle bore then you have a wiring or circuit board problem. If the problem follows the injector then you have a bad injector. If the problem goes away then you have something else going on. Once you do the swap test you'll have a much better idea of what the actual problem is.

Re: Sniper EFI bad injector [Re: AndyF] #2933310
06/14/21 07:53 PM
06/14/21 07:53 PM
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Originally Posted by AndyF
Originally Posted by MarkZ
Took the injector out tonight and it doesn't look bad. Plug was still fully seated in the injector too.

I'll post back after I hear from Holley tech support tomorrow.


Since you got that far then just swap the suspected bad injector with the one next to it and try it. The problem will either follow the injector or it will stay with the throttle bore. If the problem stays with the throttle bore then you have a wiring or circuit board problem. If the problem follows the injector then you have a bad injector. If the problem goes away then you have something else going on. Once you do the swap test you'll have a much better idea of what the actual problem is.


Swapped from front to back and it seems to be behaving itself. This is damn weird. I'm going to button it up and start it after I change the oil.


Last edited by MarkZ; 06/14/21 07:56 PM.

1987 Fifth Avenue - 512/518/D60
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