I been playing a lot with some sensors in my vehicle and have found some MAP´s to get wide readings than some others even same brand products.

Right now have 2 Maps from same suplier, same part number one gives 70 kpa´s second reads 80 kpa´s same car same place, same day. We do live 2250 mts over sea level hence no more than 80 can be read here.

Has any of you have got this before?

Which one whould work best?

 

It is best to only use GM OEM MAP sensors (or any sensor). In my testing of a dozen (or so) of them there was very little difference in readings between them.

I have one aftermarket MAP (common auto store brand) that reads inverse. Low voltage at high MAP, and high voltage at low MAP. No wonder the truck I pulled it from was in the junk yard. Brand new sensor too, which is why I grabbed it. Didn't realize that it wasn't a GM MAP sensor until I got it home.

Note that there are many different MAP sensors that have different output ranges. So be sure that you are using the proper sensor. GM puts a 3 digit hot stamp on the flange above the connector to ID the MAP sensors. The 039 and 460 are the common 1-bar MAP sensors.

RBob.

 

This 2 sensors are original GM parts grabed from same store but reading is quite different 10% or more.......

RBob.[/quote]

I have one aftermarket MAP (common auto store brand) that reads inverse. Low voltage at high MAP, and high voltage at low MAP. No wonder the truck I pulled it from was in the junk yard. Brand new sensor too, which is why I grabbed it. Didn't realize that it wasn't a GM MAP sensor until I got it home.
RBob.[/quote]

Jejejeje funny part to play bad a** joke..... jejeje

RBob.[/quote]
Note that there are many different MAP sensors that have different output ranges. So be sure that you are using the proper sensor. GM puts a 3 digit hot stamp on the flange above the connector to ID the MAP sensors. The 039 and 460 are the common 1-bar MAP sensors.

RBob.[/quote]
Bouth sensors are 466, never have seen any difernt than 466 though

RBob.[/quote]

 

The 466 doesn't mean much. I think it is a manufacturer code.

The number that matters is hot stamped (melted) into the top flat part above where the connector plugs in. If there isn't one then it isn't a GM MAP sensor.

RBob.