IDLE SURGE FIXED!!!

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IDLE SURGE FIXED!!!

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Mustang >> Ford Mustang Tech >> 5.0 Mustang >> IDLE SURGE FIXED!!!

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IDLE SURGE FIXED!!! - 5/9/2008 6:46:21 PM

Jon82387

Posts: 84
Joined: 4/4/2006
Status: offline

man im so happy, i was at a friends and we just redid the lower intake gasket on his 5.0 and we mixed a couple of the vacuums and was messin around with them to fix it, and he remembered having a vacuum going to his BAP sensor. without the vacuum his car would surge just like mine was doing so i went and checked on mine and sure enough it was missing the same vacuum, plugged it in BAM!!! SURGE GONE!!!!

I've tried so many different things to get rid of the surge and none have worked, i dont think the vacuum was ever hooked up to the BAP in the first place so i had no clue it even needed one.

Just wanted everyone to know that if your idle is surging/stalling at startup make sure you have a vacuum going to your BAP sensor

Post #: 1

RE: IDLE SURGE FIXED!!! - 5/9/2008 6:50:40 PM

mjr46

Posts: 10902
Joined: 6/13/2007
Status: offline

any vaccum leak will cause such issue on efi/mass air

..but glad your's is fixed

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ORIGINAL: AdderMk2

im an asshole.... deal with it

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Post #: 2

RE: IDLE SURGE FIXED!!! - 5/9/2008 6:52:00 PM

Jon82387

Posts: 84
Joined: 4/4/2006
Status: offline

Yea me2, another dragon slayed!

But on a side note is this really considered a vacuum leak? I mean you would never find anything leaking out of it, just that nothing is hooked up to it? I've searched tons of forums for answers and find all the common things but have never heard of this, just seems like something that should be more commonly thought about i guess?

< Message edited by Jon82387 -- 5/9/2008 6:53:56 PM >

(in reply to mjr46)

Post #: 3

RE: IDLE SURGE FIXED!!! - 5/9/2008 7:26:01 PM

Joel5.0

Posts: 2790
Joined: 1/9/2006
From: Puerto Rico
Status: offline

quote:

ORIGINAL: Jon82387

man im so happy, i was at a friends and we just redid the lower intake gasket on his 5.0 and we mixed a couple of the vacuums and was messin around with them to fix it, and he remembered having a vacuum going to his BAP sensor. without the vacuum his car would surge just like mine was doing so i went and checked on mine and sure enough it was missing the same vacuum, plugged it in BAM!!! SURGE GONE!!!!

I've tried so many different things to get rid of the surge and none have worked, i dont think the vacuum was ever hooked up to the BAP in the first place so i had no clue it even needed one.

Just wanted everyone to know that if your idle is surging/stalling at startup make sure you have a vacuum going to your BAP sensor

If you're talking about a MAF system ('89+ or converted to MAF)..... a vacuum hose should NOT be connected to the Barometric Pressure sensor....... it does not require to read engine vacuum or Manifold Absolute Pressure (MAP). If that is the case, you're causing another problem to fix the idle problem.

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1986 GT-X303-1.72-5Spd.
Whatever it Takes
If it Ain''t a Ford, why bother

(in reply to Jon82387)

Post #: 4

RE: IDLE SURGE FIXED!!! - 5/10/2008 7:08:03 AM

Texas5.0

Posts: 664
Joined: 12/24/2006
From: South Texas
Status: offline

The idle surge sucks... took me almost a year to get my figured out.. hang in there and you'll find it.

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Trickflow Track Heat - Patriot 185''''s. Next- Cam

quote:

ORIGINAL: my77stang
i''''d hit it...... with a board........ to knock her out so i could gain entry to the poopar

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Post #: 5

RE: IDLE SURGE FIXED!!! - 5/10/2008 2:13:49 PM

Jon82387

Posts: 84
Joined: 4/4/2006
Status: offline

Ok well why then when i connected the vacuum did it cure my problems??? is it supposed to be plugged?

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Post #: 6

RE: IDLE SURGE FIXED!!! - 5/10/2008 2:36:29 PM

sYckmYnded

Posts: 145
Joined: 5/5/2008
Status: offline

joel are you sure man? mine has a vaccum line on it and i didnt put it there

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1990 Mustang LX

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RE: IDLE SURGE FIXED!!! - 5/10/2008 3:39:30 PM

Texas5.0

Posts: 664
Joined: 12/24/2006
From: South Texas
Status: offline

Barometric (BAP) Sensor
See Figure 18

Fig. 18: Barometric and manifold pressure sensor look similar

The barometric pressure sensor is used to compensate for altitude variations. From this signal, the ECA modifies the air/fuel ratio, spark timing, idle speed and EGR flow. The barometric sensor is a design that produces a frequency based on atmospheric pressure (altitude). The sensor is mounted on the right fender apron.

Its a vent - not a vacuum hook up.

_____________________________

Trickflow Track Heat - Patriot 185''''s. Next- Cam

quote:

ORIGINAL: my77stang
i''''d hit it...... with a board........ to knock her out so i could gain entry to the poopar

(in reply to sYckmYnded)

Post #: 8

RE: IDLE SURGE FIXED!!! - 5/10/2008 3:48:58 PM

sYckmYnded

Posts: 145
Joined: 5/5/2008
Status: offline

ok now im having same problem after installing a composite powerbox intake, and i was wrong my BAP sensor has NO vac line on it,
car surges up to 4k then dies, now i also removed and blocked off the EGR valve wile installing this intake, but i dont think that should have a effect on it since it has not been plugged in for a LONG time... any thoughts?

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1990 Mustang LX

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RE: IDLE SURGE FIXED!!! - 5/10/2008 4:13:09 PM

Joel5.0

Posts: 2790
Joined: 1/9/2006
From: Puerto Rico
Status: offline

Start with the basics...... DIY KOEO/KOER/Cylinder Balance Self-Test

_____________________________

1986 GT-X303-1.72-5Spd.
Whatever it Takes
If it Ain''t a Ford, why bother

(in reply to sYckmYnded)

Post #: 10