[perfectcircle]

Hey guys i'm planning a little project out. I'm looking for an ECM from a TJ 4.0 with manual transmission. When looking em up on car-parts.com it differentiates between , low emissions and std emissions (fed) for the same computer. What's the difference between the two?

[Unlimited04]

maybe california vs the real world?

[jgorm]

Originally Posted by Unlimited04

maybe california vs the real world?

+1. That's why there is so much 49 state stuff.

[perfectcircle]

Yeah, that would make sense actually. I'm just curious which one I would rather have drive-ability wise (not tree hugger wise). Am I right to assume low emissions would cut back on performance (whatever performance a 4.0 actually has) so I should go with the std?

[Unlimited04]

actually you probably wouldn't notice a bit of difference....unless the low emissions version is looking for O2 sensors you don't have. IIRC, some models have a California emissions package that has more O2 sensors. but just because you're in CT doesn't mean you don't have CA emissions...depends how the original dealer ordered the vehicle.

[perfectcircle]

Great, thanks for the heads up. I'm not even using it for a TJ so there's no way to know how it'll pan out with the o2 sensors but i'll throw it in there and see what happens.