86 gt question

R

Redtallman

New Member

Oct 3, 2004

5

0

0

Sep 24, 2006

#1

• Sep 24, 2006

• #1

hey guys got 1 for you what would cause a speed density car to cut off when the map vacume line is plug in but if it is unplug it will run but rough? check the salt and pepper plug there good,also the firing order is set for non ho motor when change to ho setting it ran even worse .i think it may have a non ho cam.just bought the car! car runs rich and when i drive it it would stutter at half throttle you have to lightly give it gas to get it going. air filter is good.



thanks for time:SNSign:

 

8

86bluecobra

Advanced Member

Dec 20, 2004

4,265

12

69

B.C. Canada

Sep 24, 2006

#2

• Sep 24, 2006

• #2

If map sensor is unplugged the car will run but it will run rough. Computer goes into limp mode. You will run very rich because the map sensor reads vacuum to determine how much fuel the car needs. An 86 mustang is a H.O. car.

 

z2o_what

Member

Mar 31, 2005

309

1

19

princeton, WV

Sep 25, 2006

#3

• Sep 25, 2006

• #3

if the engine isn't an H.O. then it seems to me like you would have to have a non-h.o. computer, but i may be wrong.

maybe you need a new map semsor

 

8

86bluecobra

Advanced Member

Dec 20, 2004

4,265

12

69

B.C. Canada

Sep 25, 2006

#4

• Sep 25, 2006

• #4

yes the map sensor could be toast. these are the same as the ones on the tarus's. maybe you could do a pick a part thing.

 

stang&2Birds

Founding Member

May 4, 2000

2,091

5

58

New England. :-) CT/MA

Sep 25, 2006

#5

• Sep 25, 2006

• #5

You MUST read the EEC codes. Read the codes, or don't waste your time or money trying to figure out an engine problem.

With the MAP disconnected, the engine will go into limp home mode.

 

R

Redtallman

New Member

Oct 3, 2004

5

0

0

Sep 25, 2006

#6

• Sep 25, 2006

• #6

thanks for the replys we messed with it more today the crazy thing we think it a regular 302 with the5.0 ho top half and the cam must be a flat tappet cam because of the non ho firing order

we will pull the intake tommorow so we can see what the heck it is


keep yall posted
:SNSign:
ps we did scan but i would have to pull most the sensors from act,map,evp,

we think its a non ho with ho intake and computer thats why it not running right

 

8

86bluecobra

Advanced Member

Dec 20, 2004

4,265

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69

B.C. Canada

Sep 26, 2006

#7

• Sep 26, 2006

• #7

well if thats the case it maybe as easy as geting a comp cam computer controlled speed density cam for it and wiring it like a H.O.