Engine Vacuum problem

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Dirtnastyfox

New Member

Mar 15, 2019

14

0

1

Virginia

Mar 24, 2019

#1

• Mar 24, 2019

• #1

I’ll make this as short as possible. Basically I plugged off all my unused vacuum ports on the “vacuum tree” and it bogs down like it wants to shut off once it’s warmed up. But it runs good at idle. But if I pull a couple of them off it doesn’t shut off but idles down a lot and runs worse. Any ideas??

 

General karthief

wonder how much it would cost to ship you a pair

Mod Dude

Aug 25, 2016

27,826

10,507

203

polk county florida

Mar 24, 2019

#2

• Mar 24, 2019

• #2

We need to know what year the car is, any modifications.
then you need to check for codes.
This will help you resolve your issues, start at the top and do it step by step, jrichker put it together with help from others.
http://forums.stangnet.com/showthread.php?t=698148

 

D

Dirtnastyfox

New Member

Mar 15, 2019

14

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1

Virginia

Mar 24, 2019

#3

• Mar 24, 2019

• #3

It’s an 88 LX supercharged and cammed bored out to 306

 

General karthief

wonder how much it would cost to ship you a pair

Mod Dude

Aug 25, 2016

27,826

10,507

203

polk county florida

Mar 24, 2019

#4

• Mar 24, 2019

• #4

Aftermarket computer or stock?

 

D

Dirtnastyfox

New Member

Mar 15, 2019

14

0

1

Virginia

Mar 24, 2019

#5

• Mar 24, 2019

• #5

I believe it’s stock

 

jrichker

StangNet's favorite TOOL

In Remembrance. Thank you for your contributions

Mar 10, 2000

27,512

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Dublin GA

Mar 25, 2019

#6

• Mar 25, 2019

• #6

Dump codes sticky

Look at the top of the 5.0 Tech forum where the sticky threads are posted. One of them is how to dump the computer codes. Codes may be present even if the CEL (Check Engine Light) isn’t on. You don’t need a code reader or scanner – all you need is a paper clip, or if your lady friend has a hair pin, that will do the job.
I highly suggest that you read it and follow the instructions to dump the codes. http://www.stangnet.com/mustang-forums/threads/how-to-pull-codes-from-eec4.889006/

 

Reactions: Dirtnastyfox

D

Dirtnastyfox

New Member

Mar 15, 2019

14

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1

Virginia

Mar 25, 2019

#7

• Mar 25, 2019

• #7

Awesome! Thanks so much!

 

mikestang63

SN Certified Technician

Aug 27, 2012

11,606

8,859

214

In the garage

Mar 25, 2019

#8

• Mar 25, 2019

• #8

the car is supercharged and you randomly started plugging vacuum hoses? Why were there open ones? One was not the BAP/MAP sensor that you capped?

Take some pictures and post them underhood

In General terms you need vacuum going to the folllowing
FPR
Brake Booster
PCV valve
Boost gauge
Boost blowoff valve
Cruise Control
HVAC controls
Charcoal cannister

with a supercharged application you normally want an open valve cover breather, cap off the breather tube and bung on the Throttle body and then a check valve from the PCV to the breather and the PCV and screen, or no PCV and breathers in the PCV hole and valve cover and cap off the bung on the intake.

 

D

Dirtnastyfox

New Member

Mar 15, 2019

14

0

1

Virginia

Mar 25, 2019

#9

• Mar 25, 2019

• #9

The middle three lines on my car aren’t there. They were just open when I got it. This is not my car it’s just a google picture. But that’s basically what I did was cap all three of the middle ones and it rand good but after it would get warm it would shut off. Then I pulled a couple of the caps off and it ran a little rough but wouldn’t shut off or anything.

 

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Blucifer99

I only understand every 3rd word

Jul 15, 2018

466

31

38

Port Mcnicoll Ontario

Apr 1, 2019

#10

• Apr 1, 2019

• #10

Just a guess. But sound like its drowning in fuel... Adjust your throttle screw abit and see if that helps.. But what exactly is the car doing? When u first start it. Does it fire normal then as it warms up drop in revs and then stalls out? Or does it chug along until it dies. Also what happens when u hit the gas. Does it stumble?

 

D

Dirtnastyfox

New Member

Mar 15, 2019

14

0

1

Virginia

Apr 16, 2019

#11

• Apr 16, 2019

• #11

Blucifer99 said:

Just a guess. But sound like its drowning in fuel... Adjust your throttle screw abit and see if that helps.. But what exactly is the car doing? When u first start it. Does it fire normal then as it warms up drop in revs and then stalls out? Or does it chug along until it dies. Also what happens when u hit the gas. Does it stumble?

Click to expand...

Well it’s been running great for the last few days. Apparently I was only running 30 psi to the fuel rail. Adjusted that and it runs great but still if I plug the vacuum tree that I’m not using it idles up and down and when you give it gas it shuts off immediately.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,147

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224

Massachusetts

Apr 16, 2019

#12

• Apr 16, 2019

• #12

Is this car still speed density? And you are supercharged? Where's the MAP sourcing its vacuum from?

 

D

Dirtnastyfox

New Member

Mar 15, 2019

14

0

1

Virginia

Apr 16, 2019

#13

• Apr 16, 2019

• #13

Mustang5L5 said:

Is this car still speed density? And you are supercharged? Where's the MAP sourcing its vacuum from?

Click to expand...

It’s supercharged and I’m not sure where the MAP is

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,147

17,843

224

Massachusetts

Apr 16, 2019

#14

• Apr 16, 2019

• #14

Firewall dead center. If the car is still stock speed density, there should be a vac line connected to the manifold

does the car have a mass air meter?

 

Blown88GT

Founding Member

Nov 13, 1999

2,282

522

164

Palm Beach Gardens, FL

Apr 17, 2019

#15

• Apr 17, 2019

• #15

This shows how to "modify" the MAP sensor when converting to MAF.
If you are still SD, it will show how it should be, i..e vacuum line connected to MAP sensor.

 

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