BARO sensor location (Page 1/1)
TurboGN MAY 10, 02:04 PM
Anyone know where the BARO sensor might be located on a L32 swapped Fiero GT?
All the information I can find for the 2007 Grand Prix it came out of says it should be right next to the MAP sensor open to the air with no vacuum line. It's not there and I have search around and can't find one.
theogre MAY 10, 03:10 PM
Not sure of that engine...

But Baro is Often the MAP...
ECM/PCM just read MAP before engine starts then use that value as you drive.

Unless the altitude charges a lot w/o turning off, most vehicles are happy with startup baro value.
Most people stop and shut down for gas food etc before baro value might matter.

Note: GM has 3 of "old" MAP sensors. All look same but have different plug. Famous Green plug uses 1 Bar sensor. Turbo/super charge engines have 2 or 3 Bar sensors. The plug body and socket are "keyed" for whichever type.

If have a ECM scanner...
Scan engine w/o starting to read Baro value.
Turn off the key.
Put a tiny bit of vacuum on MAP tube and hold it.
Turn key on to the scan ECM again. Baro value should change.

------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

TurboGN MAY 10, 06:10 PM

quote
Originally posted by theogre:

Not sure of that engine...

But Baro is Often the MAP...
ECM/PCM just read MAP before engine starts then use that value as you drive.

Unless the altitude charges a lot w/o turning off, most vehicles are happy with startup baro value.
Most people stop and shut down for gas food etc before baro value might matter.

Note: GM has 3 of "old" MAP sensors. All look same but have different plug. Famous Green plug uses 1 Bar sensor. Turbo/super charge engines have 2 or 3 Bar sensors. The plug body and socket are "keyed" for whichever type.

If have a ECM scanner...
Scan engine w/o starting to read Baro value.

Turn off the key.
Put a tiny bit of vacuum on MAP tube and hold it.
Turn key on to the scan ECM again. Baro value should change.





I tried it and it does change both readings which is strange because from the factory they had seperate sensors.

Thanks for the help.
theogre MAY 11, 08:20 AM

quote
Originally posted by TurboGN:
I tried it and it does change both readings which is strange because from the factory they had seperate sensors.

Thanks for the help.

Many "books" are wrong to start or for other years.
Worse for 3rd parties like Haynes example doesn't have any info for DIS or 700 series TBI in 87-88 Duke Fiero.

Even Fiero 84-86 had wrong rear brakes section in FSM copy/past from another model line.
TurboGN MAY 11, 05:58 PM
Well, doesn't that make things fun.

[This message has been edited by TurboGN (edited 05-11-2023).]