Follow a car without a cat with your windows down and see if your eyes burn. Also, NOx is far more harmful than CO2 to the environment and to people.
Might want to study up on how a catalytic converter works and why they're used. Also, how the car is tuned for them and without it, it's...
Keep in mind a test pipe isn't going to give you any gains over a high-flow cat (mostly just a cat that has 3" inlet and outlet will work wonders).
Only 2 reasons not to run a cat:
- Running leaded race gas
- you're cheap and/or a dick that wants to make people's eyes bleed :)
OEM HG is exactly what he's describing.
As a general rule, I like OEM gaskets best (as several of the gaskets in the cheap gaskets sets are plain wrong or of the wrong material), but you're on a budget.
The tricky ones are the throttle body gasket (hole is tiny and needs to be cut bigger)...
27 is no cat, 71 is EGR temp, and the 61 code for tranny is for the speed sensor.
I don't know enough to say that's your issue (as I don't know the ECT system that well), but it could be possible.
everyone else already has most of it, but the other things that come to mind:
- Wiring to the coils (is the right coil firing and is the wire connected to the right coil)
- wiring to the CPS (same issue)
Steering dampeners won't push back from being compressed (that would make the car want to steer in the direction of the shock's extension). Try pulling it in and out fast, that's how it works.
Older electronics and design, it's just that simple. Plus, you can pick up 2JZ-GE's for pretty cheap as they're far newer and likely to be in a junkyard (and were used in more cars).
1JZ is a waste these days. Years ago you used to be able to get a front clip for cheap and do a complete swap...
2JZGE-T swap running on 7M-GTE electronics is cheaper than going true 2JZ-GTE. The main cost of it is the turbo system (which if you're looking for power, you'd be doing on the other engines as well).
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