Would a bad coil set off trouble code?

Twisted

Founding Member

May 14, 2002

387

0

16

Hansen,CT

Nov 29, 2007

#1

• Nov 29, 2007

• #1

My 02 GT started to miss under load. Checked the codes and there is nothing. Would a bad coil or misfire be picked up by the computer and display a trouble code?

The problem started right after I filled the tank, so I might also have water in the gas. I put some dry gas in and plan to drain the tank just to be safe if the problem keeps up.

 

RandyStinchcomb

New Member

May 25, 2005

1,159

3

0

Randallstown, Md

Nov 29, 2007

#2

• Nov 29, 2007

• #2

Twisted said:

My 02 GT started to miss under load. Checked the codes and there is nothing. Would a bad coil or misfire be picked up by the computer and display a trouble code?

The problem started right after I filled the tank, so I might also have water in the gas. I put some dry gas in and plan to drain the tank just to be safe if the problem keeps up.

Click to expand...

yes the ECM will detect any and all mis-fires, check the PCV valve hose for cracks, cuts or other damage

 

Twisted

Founding Member

May 14, 2002

387

0

16

Hansen,CT

Nov 29, 2007

#3

• Nov 29, 2007

• #3

I thought that only cobra's had a knock sensor. How does a GT detect misses?

 

RandyStinchcomb

New Member

May 25, 2005

1,159

3

0

Randallstown, Md

Nov 29, 2007

#4

• Nov 29, 2007

• #4

Twisted said:

I thought that only cobra's had a knock sensor. How does a GT detect misses?

Click to expand...

correct, only DOHC's have a knock sensor but we're not talking about engine/spark knock or detonation...are we

I thought the subject was a mis-fire under load? and when a coil goes bad it will trigger a MIL

 

Twisted

Founding Member

May 14, 2002

387

0

16

Hansen,CT

Nov 30, 2007

#5

• Nov 30, 2007

• #5

It was a mis-fire. The problem seems to have gone away now. Drove the car this morning for the first time since the problem started and it is running fine now.

How does the computer know a coil goes bad? I had this problem once before, but that time the mis-fires were at idle and not just under load. Both times it was a cold, ~30F, and the car had been sitting for a couple days.

 

04GTMustang

New Member

Feb 28, 2006

348

0

0

Stafford

Nov 30, 2007

#6

• Nov 30, 2007

• #6

the ecm will not pick up all misfires. you will only throw a code depending on how bad the miss is. if its just a slight misfire it will not pick it up and throw a code.

 

2000fordstanggt

Member

Sep 6, 2005

404

1

16

Westland, MI

Nov 30, 2007

#7

• Nov 30, 2007

• #7

do you have a custom tune installed? whenever i have my tune loaded i dont get any dtc codes. i have also noticed the same thing in threads with some other people here.

 

Twisted

Founding Member

May 14, 2002

387

0

16

Hansen,CT

Nov 30, 2007

#8

• Nov 30, 2007

• #8

I have Predator tune in there. If it does it again I'll reload the factory backup and see if anything pops up.