Saw a few guys have this done.What does it do and will it set codes?

 

All it does is make it smoke alot, even just snapping the throttle at idle. Some guys say it makes a little more low end power but I'm not sure, I've never tried it. As for a code, I think it does throw a minor one, but someone will tell you for sure.

 

what exactly is it? Or how do you do it?

 

Yah it works, i can blow a thick black cloud just revving it neutral.

 

MAP=Manifold Absolute Pressure

The ECM uses this sensor to see how much boost is going into the engine. The more boost it sees, the more fuel it will make the injectors squirt. The less boost, less fuel will be injected, and makes the engine a little more efficient and cuts down on smoke.

When you unplug the MAP sensor, the ECM senses a loss of signal (open connection), or sensor out of tolerance or normal range, and will set the appropriate trouble code. The ECM is programmed to operate even with a loss of a sensor, it just assigns a default value for the missing sensor so it can keep the engine running.
Now in the case of the MAP, the ECM sets it to a high, possibly its max value, so the engine can fuction normally at load. What this also does is inject higher than normal amounts of fuel at low RPM, and will make the truck smoke just revving it in neutral. The long term effects of this is a slighty lower MPG, as the engine is not operating as efficient as possible.

Hope this helped explain it.

 

I heard with the comp it wont throw a code. Can anyone verify either way?

 

yup it throws a code but dosnt make the check engine light come on. i ran mine unplugged for months. but when its cold it dumps to much fuel into the engine and it misses. so in the winter i leave it pluged in. yes, there is a minor low end increase in power.

 

My truck responded pretty good with a lil more low-end, and a lil smoke, my comp isnt tapped and it still worked, however when I noticed a big decrease in mileage I now only do it every once in a while, but the lowend increase is noticble.

 

wonder if we could put these on a toggle switch

 

I bet you could, would have to make sure you have real good connections, solder most likely to keep the signal "clean" , we know what some signals can do when they get dirty. Sounds like a killer idea, I was thinking about it myself but not sure what mods you need to make it work, would I see a smoke show? too early, not enough coffee yet........

 

I was going to put a switch on mine, but do you have to put a switch on both of the wires? Or can you just splice one of the wires and put a switch in there?


Does anyone know if you can just splice one of the wires or does it have to be both?

 

More like:

Significantly lower gas mileage.

Washed down cylinder walls due to excess fuel.

Reduced turbocharger life due to severe excessive carbon build up on it/throwing off balance.
...
Blowby and loss of compression is soon to follow.

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More fuel than your engine can burn is NEVER good. Id love to see someone dyno back to back and see how disappointed they are with their imaginary power the smoke cloud brings them.

 

acually it does increase power on the low end. it dumps all the fuel in when you hit the go pedal. so it makes sence and you can feel it by the seat of your pants that it does increase some. not much, its more responsiveness than power, but it is there.

 

I did it and I noticed a nice bottom end increase. It also smokes a lot more if your not careful. Didn't set any codes, mileage stayed the same.

 

hey bb, did you check the codes by turning-the-key method? it set a code on mine but didnt throw the check engine light