First start issues and questions for sniper

[nick7405]

Had my first start today and was not enjoyable as I wished.


With the sniper running after a few minutes it will just stop for a split second and the car boggs heavily and then dies if it doesn't revover. It's almost like it looses power to it and stops sensing everything. I videod it and data logged which will help and will upload shortly

Any feedback pls

[Norm B]

There are a whole bunch of possible issues. I had similar issues with mine. Holley tech support diagnosed it as RF interference. My oval Cobra air cleaner was conducting interference from the distributor to the ECU causing the system to reboot on the fly. Their test for this was to wrap the distributor and first few inches of plug wires with aluminum foil to see if that solved the problem. It did and I made a permanent shield for the distributor.
What ignition system are you using and where are the components located? I am using the Hyperspark distributor and the supplied coil driver. I had the coil driver too close to the ECU and had to move it to the driver's foot box top to make the tech guys at Holley happy

I would also monitor the fuel pressure with the engine running to see if there is a sudden drop in pressure that precedes the bogging out.

Is your power supply stable? Do any gauges or other systems flicker or quit before the engine acts up?

The Sniper was a little frustrating to get set up but, after the initial hassles were fixed, it has been a big upgrade on the carb I was running before.

HTH

Norm

[nick7405]

There are a whole bunch of possible issues. I had similar issues with mine. Holley tech support diagnosed it as RF interference. My oval Cobra air cleaner was conducting interference from the distributor to the ECU causing the system to reboot on the fly. Their test for this was to wrap the distributor and first few inches of plug wires with aluminum foil to see if that solved the problem. It did and I made a permanent shield for the distributor.
What ignition system are you using and where are the components located? I am using the Hyperspark distributor and the supplied coil driver. I had the coil driver too close to the ECU and had to move it to the driver's foot box top to make the tech guys at Holley happy

I would also monitor the fuel pressure with the engine running to see if there is a sudden drop in pressure that precedes the bogging out.

Is your power supply stable? Do any gauges or other systems flicker or quit before the engine acts up?

The Sniper was a little frustrating to get set up but, after the initial hassles were fixed, it has been a big upgrade on the carb I was running before.

HTH

Norm

Thanks for the help, I adjusted the idle set screw to set the IAC to 7%. It apparently was at like 60%. That and I routed the PCV to the intank which was originally capped off. Iasue hasn't come back

[Norm B]

Good news