94 GT running rough

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 19, 2010

#1

• Oct 19, 2010

• #1

okay, heres the situation.

94 Gt mustang, 270k miles. Been garaged for about 3 months.

Started it up and drove it today, it was running really rough, like it was running on 6 or 7 cylinders. Plugs and wires have less than 30k on them. Fuel filter less than 10k. Put fresh gas in it, tried seafoam in the gas and down the intake, cant seem to get it to run right. any suggestions?

Check engine light works, and it is not on.

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Oct 19, 2010

#2

• Oct 19, 2010

• #2

Run a cylinder balance test.

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 19, 2010

#3

• Oct 19, 2010

• #3

how do i do that?

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Oct 19, 2010

#4

• Oct 19, 2010

• #4

It's outlined in the repair manual. Here's a brief synopsis:

EEC-IV Testing - Cylinder Balance Test

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 20, 2010

#5

• Oct 20, 2010

• #5

I read something in that article about a code reader. Do i need a code reader for this? or do you pull the codes the same way as you get them off a fox body? (wire jumper trick)

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Oct 20, 2010

#6

• Oct 20, 2010

• #6

You don't need a code reader. You can retrieve codes and do the CBT the same way as on an aero fox. If you have a repair manual, it is also outlined there.

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 20, 2010

#7

• Oct 20, 2010

• #7

I have the haynes manual that covers my 89 fox, but its kinda torn up and missin a couple pages i think i should probably pick up a new one. I remember a long time ago, the CEL came on in the 94 and went off while driving within 2 minutes. maybe now ill know what that code was.

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 20, 2010

#8

• Oct 20, 2010

• #8

where are the two connectors to pull the codes? i cant find them anywhere

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Oct 20, 2010

#9

• Oct 20, 2010

• #9

Passenger side fender, between the strut tower and firewall.

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 21, 2010

#10

• Oct 21, 2010

• #10

I know all of these questions sound retarded :/ I have never done anything like this before, all of my previous vehicles were OBDII.

Do i perform the KOEO test before the KOER? and how do i know what codes im getting? I know to count flashes, but is there a long pause between codes so i know when one ends and another starts?

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Oct 21, 2010

#11

• Oct 21, 2010

• #11

I sent you a PM that contains what I think will be some helpful info.

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 22, 2010

#12

• Oct 22, 2010

• #12

I tried performing the KOEO test, no codes showed up.

When i try to do the KOER, about 5 sec after startup the CEL will flash once, the RPMs will briefly rise to 1k, then drop again and nothing happens.

How can i get it to perform the CBT if i dont even know when the KOER test is finished?

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Oct 22, 2010

#13

• Oct 22, 2010

• #13

How are you trying to pull codes? Code reader, VOM, test light or jumper wire? I would try to do the test light method.

When you pull KOEO codes, do you get any codes or code 111?

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 24, 2010

#14

• Oct 24, 2010

• #14

jumper wire. I somehow got to the cylinder balance test and i got a 2-0

checked #2 plug and it was completely fouled! the gap was HUGE!

changed plug, car runs perfect.

BUT, now i have 2 issues.

I still cant pull the codes, the CEL still only flashes once for a brief second, the RPMs come up for a second then settle once the CEL goes out.

And now, my speedometer wont work and the radio wont turn on! all other gauges and accessories inside work except radio and speedo. What gives?!

 

9

95steeda

Member

Oct 14, 2003

37

0

7

Oct 24, 2010

#15

• Oct 24, 2010

• #15

Did you check the fuses?

 

9

94GTMustang5.0

New Member

May 29, 2009

98

0

0

Oct 25, 2010

#16

• Oct 25, 2010

• #16

I havent got around to the fuses, i have been checking the wiring under the dash alot because there used to be an alarm wired up, and they did a bad quality job so im checking to make sure its not related to the alarm.