We've been here; Downpipe for 1.5l

[Naomi]

Read this if your going to attempt to replace the o2 sensor with a resistor.

http://www.bobblick.com/techref/projects/o2sensor/o2sim/o2sim.html

This 'looked' right but I didn't care to pay this much:

http://focus.c-f-m.com/index.asp?PageAction=VIEWPROD&ProdID=77

This is the DIY kit I used. I wired into the existing plug and wires from my o2 sensor:

http://www.apexr1.com/mamilelcfi.html

-Tim

[projectmx]

do any of these things help with the first o2? that is the on that has flatlined on me recently and i was wondering about doing this cheat with the front sensor or if i should just replace that one

[Naomi]

no, you need that to run the engine, its part of the fuel injection system. basically the o2 sensor signals the fuel processor when to add or reduce my fuel (as air is constant, the system has the compensate for air density/quantity by adjusting fuel mixture)

if you pull the first o2 sensor, your system will probably kick back into closed loop as soon as it enters open loop.

[davens]

Just got this in the mail:


Looks like I'm doing some wiring this weekend...and then no more 2nd o2 sensor.

[davens]

So...I'm finished. If I get another cracked manifold, so help me, I'm selling this car.
This is the second time I've replaced the exhaust manifold.
The results of my modified header? I started the car up, no MIL, pull out and drive real easy to warm up. No obvious drawbacks yet.

Get out on the main street and wail on it as it goes into second.
2k...nothing different
3k...nothing
4k...nothing, oh, wait is that,
5k...hey that is a mild improvement
6k..things feel...almost peppy

I shift into 3rd...

same results again...upper rpm improvement.

I'm digging it. I don't know how it would compare to a real header.
If anything, this whole thing was worth it for the MIL eliminator for that second pesky, expensive, stupid O2 sensor.

We don't have smog testing here. Yet. It's starting mid to late 2005.
When we do have to start smogging, I don't anticipate the absence of precat material to cause any problems.
1. It's an invisible mod...looks stock as it did last week. Nothing to tip off the smog tech.
2. The precat being so close to the primaries is designed to get hot quick. So the precat lights off and starts cleaning sooner after startup. I'll bet this was done to satisfy EPA emissions qualifications. But by the time I drive down to the emissions station, the main cat is nice and hot and hopefully doing it's job.

[bruce95fmla]

Where did you get the O2 mod from and how much was it...
I need that mod.
Bruce

[davens]

duh...one of the links three posts up:

http://www.apexr1.com/mamilelcfi.html

It says its for 99+ but it worked for my obd2 1998. If you're '95 and obd1...I dunno.

[bruce95fmla]

duh...one of the links three posts up:

http://www.apexr1.com/mamilelcfi.html

It says its for 99+ but it worked for my obd2 1998. If you're '95 and obd1...I dunno.

thank you much

[bruce95fmla]

Here is your answer to your 1.5 downpipe issues.
It's made by Wagner Auto..

http://www.wagnermotorsports.net/projects/18/Im000743.jpg

Why don't you guys, get him to make you a turbo.
One of you 1.5 guys, just front up the cash and get a turbo and manifold and downpipe made for your car.

-------
I have been contacting him about fabbing a turbo for my Protege.. may run a T28.
Bruce

[loganss]

duh...one of the links three posts up:

http://www.apexr1.com/mamilelcfi.html

It says its for 99+ but it worked for my obd2 1998. If you're '95 and obd1...I dunno.

Is this still working for you? If so I'm ordering it as soon as possible, then work on eliminating the pre-cat. It's $25 now.

Sorry about bringing back a lot of old posts but I'm not trying to reinvent the wheel.