Just wanted to check in and see if someone can provide some insight into the Holley Sniper system here --
Over the last two mornings, I've had severe drivability issues with my Sniper EFI system. It starts with dying at idle coming off deceleration in gear, and eventually evolves into failing to maintain an idle due to excessively lean fuel trims (A/F ratio value on the handheld unit is ready 20-35%+, worse under load).
I figured I'd just throw a fuel filter at it while it was in the shop. 5 minutes in and out, and she was running good.
Got home, parked it, and woke up the next morning -- same thing. Choking / sputtering / dying. A/F values near 20-30% again.
I don't have the EFI dongle, so I can't do any of the techno-wizardry recommended online, but if someone could tell me if I'm on the right track here:
If I disable closed-loop fuel control via the hand-held display (assuming my best mixture / fuel map hasn't been corrupted by the above), would that isolate the wide-band HO2S as being at fault if the EFI system were then to run as normal?
I'm a bit leery of the sensor primarily due to the astronomical fuel trims, and the fact that the past few mornings have been colder than normal. So I'm suspecting possible thermal shock at cold-start may have wiped it out, but don't yet have the tools to verify it and condemn the sensor (EFI dongle is in the mail).
Appreciate any advice.
Over the last two mornings, I've had severe drivability issues with my Sniper EFI system. It starts with dying at idle coming off deceleration in gear, and eventually evolves into failing to maintain an idle due to excessively lean fuel trims (A/F ratio value on the handheld unit is ready 20-35%+, worse under load).
I figured I'd just throw a fuel filter at it while it was in the shop. 5 minutes in and out, and she was running good.
Got home, parked it, and woke up the next morning -- same thing. Choking / sputtering / dying. A/F values near 20-30% again.
I don't have the EFI dongle, so I can't do any of the techno-wizardry recommended online, but if someone could tell me if I'm on the right track here:
If I disable closed-loop fuel control via the hand-held display (assuming my best mixture / fuel map hasn't been corrupted by the above), would that isolate the wide-band HO2S as being at fault if the EFI system were then to run as normal?
I'm a bit leery of the sensor primarily due to the astronomical fuel trims, and the fact that the past few mornings have been colder than normal. So I'm suspecting possible thermal shock at cold-start may have wiped it out, but don't yet have the tools to verify it and condemn the sensor (EFI dongle is in the mail).
Appreciate any advice.