RT3 4.6 ltr modular hotrod engine o2 sensors?
 

I'm hitting a brick wall while trying to determine the correct o2 sensors for my hotrod crate engine, any help would be hugely appreciated. I'm close to registering the car but need her running correctly to get an exhaust emission test completed to get her on the road. I'm hoping someone on the forum is running the same engine.

OEM ECU or aftermarket?

Big Head Benjamin?

Oem ecu , no mods at all

The engine is appx circa 08 I believe, virtually new with only 350 km , tremec 5 speed manual gearbox, I believe these crate motors were rated at around 350 hp.

Easy then! You must run OEM O2 sensors for the ECU to be able to read them.

If you just want an AFR gauge on the dash anybody's sensor will work. If you want your EFI to work them OEM sensors.

Ok the sensors that came with the 3 cars we imported to Australia are densos, tbh not sure if that's oem, anyway in Australia I can't match them up and nobody and I mean nobody seems to be able to help, so if anyone in the US can help me find the correct sensors for these cars I'd be mighty appreciative, thanks again

The denso sensors are rears #234000-5990 , 02J16.1 car has faulty and mismatched sensors which is why we're trying to purchase some new suitable ones and also for future replacement, the front sensors are ford 8J3.

The 4 sensors in my 2007 4.6 3V Sport Trac are all the same.
The Motorcraft 4 pack fits late 90s-2008 V8s.
The crate motor should be the same but I’m not sure.
For a stock motor in a pickup it runs great

Thanks sunman I'll try to do a search on them , although I have already done some research on motorcraft without any luck

Just go to your local Ford Dealership and step up to the parts counter. These are in stock over the counter items. No big deal. Open up the parts book, read down for model and year, pick off the part number, remove the sensors from the shelf. It's that simple!

Yeah Roger that, ill give it a go, cheers.

Yeah well that was a flop, anyone out there actually running one of the hotrod crate engines and knows some actual parts #'s , don't need any dick answers just info

If you have emissions requirements in Australia, and we know you do, the government will require service parts availability to return emission systems to statutory compliance when they fail. The dealership will carry these because of compliance. Autoparts stores — same story.

Wow, ok all my problems are solved, thanks again.

I think you may be missing part of the recipe. This is a crate engine... The OP doesn't state the origin of the engine and if it is Australian federalized. The O2 sensors on this engine might deviate from a stock 4.6 in either AU or the US.

I don't think so Tony.

From an operational sensor point of view, the origin of the engine is perhaps not as important as the EFI system. The OP has already indicated the EFI is OEM Ford. That obviously means Ford calibrated it for one of their over the counter narrow band O2 sensors. Because the EFI has already been calibrated for a particular O2 sensor by Ford fuel system calibration engineering, it will require that sensor to operate correctly in closed loop..

The shortest way home for the OP is to go to Ford and get the sensor they calibrated their EFI system for. He maintains that is not possible. I tend to doubt that. But, let's give him the benefit of the doubt and say, for whatever reason, that sensor is not available in Australia!??

If that is the case the bottom line is the EFI system he has will never operate in closed loop without that sensor. He has two alternatives available to him:

Alternative 1:

Plug the O2 sensor ports and operate the ECU in open loop. While certainly possible you loose all the benefits of a closed loop system using oxygen sensing to adjust mixtures on the fly. Additionally there is an excellent chance the Regulatory Authorities in Australia will not license nor pass the car for operation on Australian roads in this condition.

Alternative 2:

Deep six the OEM ECU and buy an aftermarket ECU where he can specify and install any O2 sensor his heart desires. You will be back to all the good old fashioned fueling control possible with an O2 sensor but, and this is a big but, again the car will very likely still not be possible to register for use in a daily driving fashion on Australian roads.

An additional concern for our erstwhile enthusiast is the crate motor even with good O2 sensors if not submitted by Ford for compliance with Australian clean air standards again will not be licensable for operation on Australian roads.

If the usage is off road, then new vistas open up for our OP. Literally any aftermarket ECU can be used. All he needs to do is decide which one he likes and pay for it. I suspect the off road usage however is not how he intends to use this vehicle so, while possible, this does not really solve his problem.

The OP needs to come to grips with reality and make decisions that will jive with Australian regulatory compliance and stop looking for ways around the system. Life will get easier.

A possibility I did not speak to is that he bought a crate engine in the US and is attempting to license a car in Australia with that engine installed. That particular path has an unhappy ending also.

The sensors are upstream and downstream of cat converters, do you have converters?
Post photos of what sensors you have I can compare them to what’s in my pickups. Ford used the same one in lots of vehicles.

You can shut off the rear sensors and the engine will run OK, Sunman. However, you can not shut off the fronts. I am unfamiliar with the Australian emissions requirements but I would bet the fronts are absolutely necessary. I am not certain about the rears. They might be also.

While I could be incorrect, I was under the impression the OP was speaking about the fronts but, again, I could be wrong.

Your, observations about Ford using the same sensor in many vehicles is consistent with my understanding also. Which is why I am surprised that Ford would not have sensors at a dealership to replace failed components in customer vehicles.

Why not just contact ford racing and ask them for the part number?

The pn is usually conspicuously displayed on the part.