Am I losing power?
 

I heard that running an off-road H-pipe on a 4.6 can actually rob you of power due to the Check Engine light being on, and the computer holding the motor back a little bit. I have seen some sort of aftermarket wire harness that plugs into the O2 sensors in the H pipe, but I can't remeber who makes it. Does anyone no if this is true or if this product helps?? thanks in advance

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97 Aztec Gold GT w/Steeda heads,TB,
shifter,headers, subframe conn. 3"flowmaster exhaust and
150 hp Nitrous Express.

When the computer doesn't get a signal in the appropiate range from the O2 sensors, it stays in a safe, or limp home mode, and turns on the check engine light. In the safe mode the computer just uses a set of safe parameters for fuel and timing and doesn't adapt, which means it runs rich and with little timing.

Notice how when you first start your car, its a little slugish until the tempature gets up? O2 sensors don't work until they get hot, so the computer goes into a similiar setup called an open loop. When the O2 sensors start working the car switches into closed loop mode where it uses the feedback from the sensors in order to attempt to optomise running.

The after market stuff just sends the computer a "everything is just fine" signal, some voltage, to fool the computer into thinking the O2 sensors are working.

Where can I get these aftermarket parts you are talking about? I've seen them but I can't remember where? Who makes them etc. Thanks again.

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97 Aztec Gold GT w/Steeda heads,TB,
shifter,headers, subframe conn. 3"flowmaster exhaust and
150 hp Nitrous Express.

I'm pretty sure you're looking for Dallas Mustang. 1-888-mustang. They are called the MIL eliminators

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(96Cobra/softtop-3.73,almdrvsht,fancontrl,steeda sbfrmes+shifter,eibachspgs,pulleys,Bassani X pipe,C&L 80mm
Cobra DYNO 301rwhp horsepower w/out steeda timing adjuster
93 Ford Probe Gt(slower but turns)

THANK YOU!!! I just ordered them. They'll be here by Friday!

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97 Aztec Gold GT w/Steeda heads,TB,
shifter,headers, subframe conn. 3"flowmaster exhaust and
150 hp Nitrous Express.

No thanks needed bro. Just get that thing on a dyno. I'm curious what it would do on the NOS..

Gotta get to the track first. Then comes the dyno. I think I found a dyno lab a few blocks away! And I might be going to the track on Sunday. If I do I'll post the results ASAP.

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97 Aztec Gold GT w/Steeda heads,TB,
shifter,headers, subframe conn. 3"flowmaster exhaust and
150 hp Nitrous Express.

Hey, where did you find a dyno? Here in Springfield??? Let me know if you found one.

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1996 Mustang GTS
K&N, removed air silencer, 3.73s, turndowns after H-pipe (no mufflers)