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Fuel Systems, Fuel Injection, Carburation, Supercharging Fuel Systems, Fuel Injection, Carburation, Supercharging, Questions and answers.

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Old 05-21-2020, 06:31 AM   #31
Old Buzzard

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I have one installed in my 55 truck. 327 mostly stock except for being 30 over.
When I installed mine, I located the o2 sensor about 14 inches from my collectors. The recommended location is no more than 9 inches. The system would not operate correctly. It back fired and did all sorts of funny things. I called Holley, they said check the fuel pressure and the o2 sensor. My fuel pressure was 55 psi. I relocated the o2 sensor and it changed everything. There is one thing I do not like about this system and that is the fuel pump is noisy. I can here it run while driving.
Did you take the exh pipe off, to relocate the bung?
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Old 05-21-2020, 06:42 AM   #32
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Did you take the exh pipe off, to relocate the bung?
I don't have FI but I put my a/f sensor bungs on the collectors because I could pull them off easy to weld.

Also be sure your sensors are on the top half of the pipe. On start up the water that condenses inside the cold pipe and doesn't have a chance to evaporate can get into the sensor and screw it up permanently.
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Old 05-21-2020, 06:48 AM   #33
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I'm curious if the location of the o2 sensor and dual exhaust can be a problem with some installations. Do any factory units have the sensor on just one side? (obviously I'm not up on newer car systems with dual exhaust).

Might be a good diagnostic tool to install a bung in the other side and plug that hole? I did that with my A/F gauge just to be sure both sides are equal.
if the exh is a new install. I do that on my personal cars, too.
My EFI LIVE tune tool is set up to "spoof" the narrow band sensor, that I take out, to put the WB in. ECM still sees a NB signal, and I see the WB.
I/we don't use the clamp on adapters. Too much chance for a leak.
My LS install, in the rust bucket, has 2 bungs, on each side. [The LS uses 2 heated NB sensors].
MOST frequent issue doing tuning/troubleshooting is, exh leaks. It WILL give you fits!
Cheapo headers, poor connections, blown gaskets, are the most frequent we find.
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Old 05-21-2020, 09:39 AM   #34
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A work around for that is use the Tanks Inc (or similar) set up of an internal fuel pump in a fuel injection baffled fuel tank. I set mine up this way and that part of it I am happy with. It added some to the expense but none of the noise you are talking about. I think this is the only way I would set it up.
Problem is, they don`t make the tank for the truck.
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Old 05-21-2020, 09:41 AM   #35
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Did you take the exh pipe off, to relocate the bung?
No, I cut a new hole with a cutting torch. Welded up the old bung hole.
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