What can you do on a late model vehicle with OBD2 and an aftermarket EFI so that it can pass the state emissions testing? Here in Texas a post '96 vehicle can have no codes set for the annual emissions test, and can't return an undefined value.

Yeah, you're stuck running the factory electronics on a road vehicle. It's against Federal law to do otherwise. Why can't you run this thing with the factory electronics?

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Joshua

Can you go with the factory electronics for just the emissions inspection?


Them back to MS2 For whatever else you do?


Greg

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http://www.youtube.com/hyperpack

Some older OEM OBD2 systems are a relatively simple TPI. I was wondering how those who upgrade deal with the emissions testing.

If you change the fuel delivery hardware it's going to be tough to hide the changes. If they don't lift the hood and just plug into the OBDII port then you have a still illegal option. Leave the factory electronics in place, you probably need them to run the dashboard anyhow. Make a couple of high power resistors so the ECU still 'sees' injectors. Run the injectors with Megasquirt allowing the factory ECU to run all the emission devices, transmission, etc. Of course this has its limits. It is very likely you will set codes while tuning and you may set them even with a perfect MS tune depending upon the original ECU's level of sophistication.

What is actually legal, and possibly easier, is to update to a later engine with port EFI. What has OBDII and throttle body injection anyway?

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Joshua

In a world just off shore from Slant Six .com I play with OBD1 GM stuff. I have both TPI and TBI setups. I have modified the TBI setups for a decade including some fairly radical builds.

You cant do much of anything with these without tripping codes. Even custom chips will not completely eliminate them.

Luckily I dont have to emissions test anything....ever.

I have a TPI LT1 Roadmaster . It passed an emission test just before I got it. Im not touching anything. Its OBD1. The Guys with OBD2 LT1 cars convert back to OBD1 if they want to mod anything.

You could always tune the hell out of your Megasquirt and hope nobody notices anything remiss.........mebbe wear a gorilla suit.

Mebbe have an OBD2 port ready for them......(with 240v output)

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Yeah....Im the one who destroyed this rare, vintage automobile.....

Greg

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http://www.youtube.com/hyperpack

I use to live in San Antonio for a long time. They never had a an emissions test. I think San Antonio is exempt from that. Emission tests were in the other big cities like Houston and Dallas--were the smog is much worse. Although that was about 4 years ago...

Every time I went for inspection I got approved. All they did was drive the car forwards and backwards to make sure engine/brakes work and test the lights. I even had one guy come back to me and tell me that my left blinker was out, but still pass me on registration. (As long I assured him I would fix it.) I really think inspection is Texas trying to get some money and 'create jobs', but that is just my opinion.

I'd do the test and find out what they say. Even if they come back with a problem I believe you get until end of registration +5 days grace period.

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~Less think, more do

Austin has the emissions test. San Antonio has been spared, but likely not much longer. The Texas test is not difficult, they did open the hood, I don't know what he was looking for. I think he checked the brake fluid level.

I have no OBD2 mod planned, that is for certain. Someday these will be old cars and someone will want to modify them. I think you have to know alot about how your OEM system works. The aftermarket will evolve to make it easier.

Tim, there are some MS plug and plays out there, if there's one for your vehicle, you plug it into the factory location and use it unless you need to be inspected, whereupon your plug the original back in.

If you've modified beyond just the computer control, well... sorry. Or, if the right MS PnP isn't made for yours, perhaps you could make one...