94 mustang driveability

S

svtdrop

New Member

Mar 25, 2008

59

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0

san francisco, CA

Jul 23, 2008

#1

• Jul 23, 2008

• #1

i have a 94 gt, when i drive the car for 20 miles or so its ok, but when i turn the car off, then turn it back on, the car throws out alot of black smoke and sound wierd and car doesn't idle..... i just changed the ECT sensor, but it did it before i changed the sensor, has anyone ever had this issue before?

 

hollywoodstang

Active Member

May 23, 2006

1,095

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36

Jul 24, 2008

#2

• Jul 24, 2008

• #2

Yes. when my rings were toast...Get it rebuilt or rebuild it yourself if you have the time and skills. Good luck

 

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tstang21

Member

Apr 14, 2008

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Jul 24, 2008

#3

• Jul 24, 2008

• #3

means that your piston rings are out. do you smell something weird while your driving ?

 

S

svtdrop

New Member

Mar 25, 2008

59

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0

san francisco, CA

Jul 24, 2008

#4

• Jul 24, 2008

• #4

i doubt it because this engine was on my 92 and i didnt have this issue, as soon as i put it in the 94, i had this issue...it seems like it dumps too much fuel when i turn car on, but it goes away and its fine....

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Jul 24, 2008

#5

• Jul 24, 2008

• #5

If you stab the throttle and let it fall back to idle, does it straighten out?

I would be more inclined to think it's an engine management issue. A sensor is giving bad info because it gets heatsoaked or something along those lines.

You might try retrieving codes. Also, if it happens like clockwork, view PIDs while it's acting up. You might see a sensor is out of calibration.

Good luck.

 

rj95svt

Member

Jan 11, 2007

422

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16

Hayden, AL

Jul 24, 2008

#6

• Jul 24, 2008

• #6

What mods do you have done to the car?


I had the exact same problem you did for a while when I first got my car. For the first 30 seconds or so when the engine was warm the car would not idle it had a strange muffled sound and the car would blow out black smoke. After 30 seconds or so the car would start to act normal. It turns out my cobra had a stock gt computer in it. With the cobra's stock 24lb injectors and the GT computers rich start up fuel tables the car was flooding. It only did this though on hot starts. All other times it seemed to run pretty good except it did have a fairly unstable idle pretty much all the time.

I noticed I didn't have a J4J1 (cobra) computer when I installed the tweecer so I downloaded the factory cobra tune into the tweecer and it's worked great since.

 

S

svtdrop

New Member

Mar 25, 2008

59

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san francisco, CA

Jul 24, 2008

#7

• Jul 24, 2008

• #7

my mods are 30lb injectors, 255 feul pump adjustable fuel pressure regulator @35psi, e cam roller rockers....... is is doing the same as rj95svt explained...... my car is a gt with no tune yet,

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Jul 24, 2008

#8

• Jul 24, 2008

• #8

svtdrop said:

my mods are 30lb injectors, 255 feul pump adjustable fuel pressure regulator @35psi, e cam roller rockers....... is is doing the same as rj95svt explained...... my car is a gt with no tune yet,

Click to expand...

For future threads, you should list your mods in your sig or opening post. Knowing that you have a HCI makes a big difference.

 

rj95svt

Member

Jan 11, 2007

422

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Hayden, AL

Jul 25, 2008

#9

• Jul 25, 2008

• #9

I believe that until you get it tuned you will probably continue to have problems.
The startup fuel table is probably causing all your problems because your computer thinks you have 19lb injectors.