For those who really KNOW their Sensors...

[gmrulz4u]

I found out tonight that for whatever reason, my MAP Sensor "maxes out" at only 60% throttle!?

 

Here's just SOME of what I know about the MAP Sensor:

 

1) It determines engine "load" when the engine is running, and Barometric Pressure/BARO(for elevation compensation) when the engine is "off".

2) The highest the MAP voltage will, or at least SHOULD, ever go is to that of the BARO reading, which in my case(where I live) is usually about 4.75 volts.

3) At WOT, the MAP should be VERY near that of the TPS.

4) At idle, the MAP should read about 1/3 that of the BARO(with no load).

 

So, when my TPS is telling the ECM that I'm only at 60% throttle opening, why the hell is my MAP Sensor telling my ECM that I'm under FULL LOAD?

 

I'm assuming it's a vacuum leak somewhere, causing the vacuum to DROP too rapidly, mis-informing the ECM, and therefore causing my very over-due RICH condition...

 

Anyone with anything to add here??

 

THANKS A M!LL!ON:)

[Robby1870]

I found out tonight that for whatever reason, my MAP Sensor "maxes out" at only 60% throttle!?

 

Here's just SOME of what I know about the MAP Sensor:

 

1) It determines engine "load" when the engine is running, and Barometric Pressure/BARO(for elevation compensation) when the engine is "off".

2) The highest the MAP voltage will, or at least SHOULD, ever go is to that of the BARO reading, which in my case(where I live) is usually about 4.75 volts.

3) At WOT, the MAP should be VERY near that of the TPS.

4) At idle, the MAP should read about 1/3 that of the BARO(with no load).

 

So, when my TPS is telling the ECM that I'm only at 60% throttle opening, why the hell is my MAP Sensor telling my ECM that I'm under FULL LOAD?

 

I'm assuming it's a vacuum leak somewhere, causing the vacuum to DROP too rapidly, mis-informing the ECM, and therefore causing my very over-due RICH condition...

 

Anyone with anything to add here??

 

THANKS A M!LL!ON:)

 

Based on that info, I will agree that you have a small vacuum leak somewhere. I dont know my sensors that good, but you're right, why would it be saying that you are at WOT when you are at 60%, therefore making you run rich. I would assume a vacuum leak would cause that

 

Robby

[Baddflash]

I agree, a vacuum leak or possibly defective MAP. :?