What Should My Map Sensor Read at Idle in Kpa

I take Howell TBI on my 401. I'thousand suspecting vacuum leak from break power booster. High pitch audio in the cab goes away when I disconnect vacuum line to my booster. I have replacement part on order. What is typical MAP sensor reading at idle (~ 700 rpm)? Mine is currently reading somewhere in 35-45 kPa range. I would expect MAP sensor reading to improve once I replace ability booster.

Mail service by **Tatsadasayago** » Mon Aug 15, 2016 ane:31 pm

That loftier pitched sound is likely coming from the air inlet near the brake rod.
Sometimes spraying brake-kleen around where the rod enters the booster, (With the engine running) while pumping the pedal several times clears out and dirt/gunk that is preventing the valve from seating properly.
Worth a shot in lieu of buying a new booster...

And yes, the vacuum leak with definitely touch the MAP sensor readings.
Pulling the booster vacuum hose and plugging information technology should go your MAP readings support to normal.
sixty-70 is about correct for a good engine below 3000', which is equivalent to 20" on a gauge.

Mail service by **babywag** » Mon Aug 15, 2016 iii:34 pm

Tatsadasayago wrote:That high pitched sound is probable coming from the air inlet about the restriction rod.
Sometimes spraying brake-kleen around where the rod enters the booster, (With the engine running) while pumping the pedal several times clears out and clay/gunk that is preventing the valve from seating properly.
Worth a shot in lieu of buying a new booster...

And yes, the vacuum leak with definitely touch the MAP sensor readings.
Pulling the booster vacuum hose and plugging it should get your MAP readings support to normal.
60-lxx is about right for a good engine below 3000', which is equivalent to 20" on a approximate.

60-lxx MAP is not what you should be seeing, I recollect you're confusing the conversion with pressure vs. vacuum.

If stock cam, your MAP reading might drop a tad lower later on fixing the vacuum leak, merely not much.
Really depends on your engine and tune.

Mail by **Tatsadasayago** » Mon Aug 15, 2016 4:fifteen pm

You are disputing that threescore-lxx KPa is equivalent to 17-20" of manifold vacuum?

Postal service past **ferrum** » Mon Aug 15, 2016 5:46 pm

Manifold vacuum and pressure got me confused a bit until I saw this nice little picture from AA1Car.com site.

I call back my break power booster is original and since I have new one coming soon, I'g going to change it out. None of the auto parts shop where I alive stock this anymore. I promise I can just movement my master cylinder out of the way enough to remove booster without having to disconnect break lines. Has anyone alter out break booster before without disconnecting pause lines from the master cylinder?

Postal service by **babywag** » Mon Aug 15, 2016 5:51 pm

Tatsadasayago wrote:Y'all are disputing that threescore-70 KPa is equivalent to 17-20" of manifold vacuum?

When tuning a vehicle or reading a MAP sensor value 0 is greatest vacuum / 100 is no vacuum
Typically stock engines idle ~30-xl
Decel would be ~20, 60-70 would be a slight engine load, 100 would be WOT

Post by **Tatsadasayago** » Monday Aug 15, 2016 v:52 pm

Yeah, if y'all are conscientious, you can move the main forwards and downwardly without crimping the lines. You only need about 2" infinite to get the MC articulate, but need to go it downward out of the way so the booster can come out.Y'all will discover the hardest part is worrying the booster nuts off the studs...long time with a wrench from under the dash. Deep sockets unremarkably aren't deep plenty for the first inch or so.

Post past **Tatsadasayago** » Mon Aug 15, 2016 five:55 pm

babywag wrote:

Tatsadasayago wrote:You are disputing that 60-70 KPa is equivalent to 17-20" of manifold vacuum?

When tuning a vehicle or reading a MAP sensor value 0 is greatest vacuum / 100 is no vacuum
Typically stock engines idle ~30-40
Decel would be ~twenty, sixty-70 would exist a slight engine load, 100 would be WOT

100 Kpa on a MAP sensor is WOT aka: barometric pressure.
I'm not sure where you are getting your 30-40 numbers only we'll agree to disagree.

Mail by **babywag** » Mon Aug 15, 2016 6:29 pm

Tatsadasayago wrote: I'm not sure where you are getting your 30-40 numbers but we'll concord to disagree.

From but about every car I've ever seen...if a car has a 60-seventy MAP reading @ idle it has some serious issues or i hell of a cam installed.

Post by **Flip** » Tue Aug 16, 2016 12:46 pm

Hey guys,

The simply person in this thread who may be wrong, so far, is me. I made an assumption on Howell's strategy without checking (actually that makes me wrong regardless of the issue).

There are two different ECU strategies. So it would depend on which strategy that Howell follows.
To find out what is right, hook upward a vacuum gauge and compare.

Mail past **babywag** » Tue Aug sixteen, 2016 two:x pm

Same strategy every bit a zillion other cars on the route...all the below employ the same MAP sensor equally typical GM TBI
ACURA 1996-1997
BUICK 1985-2004
CADILLAC 1985-1996
CHEVROLET 1985-2004
EAGLE 1988
GEO 1990-1993
GMC 1985-1998
HONDA 1994-1997
ISUZU 1989-1997
JEEP 1985-1995
OLDSMOBILE 1985-2004
PONTIAC 1985-2004
SATURN 1991-2002
Howell did update to a newer style MAP on newer systems, simply it functions the same, only a smaller GM sensor used on newer GM vehicles.
Since a picture show is worth a yard words...and much faster/easier than trying to convince people or explain information technology...

5" Vacuum

10"

fifteen"

xx"

25"

Post by **ferrum** » Fri Aug 26, 2016 10:07 am

I replaced my break power booster couple of days ago. Took O'Reilly's mode too long and a few phone call to get the part that I order in early August. I likewise had to run over to my favorite basics and bolts shop to become the right nuts. Booster was shipped with 9/xvi" basics that was boogering up the threads on the stud. Studs turned out to be metric 10mm. I was not happy with O'Reilly and I will non buy from them again.

My idle improved quite a bit. I nonetheless need to claw upward my reckoner to see the sensor reading yet.

Post by **chevelleguy** » Monday Aug 29, 2016 x:14 am

Restriction- to slow down or stop

Suspension- to separate or crusade to separate into pieces as a outcome of a blow, shock, or strain.

What Should My Map Sensor Read at Idle in Kpa

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