COP Diagnosis

Reply Subscribe

Thread Tools

Search this Thread

Mar 26, 2012 | 06:09 PM

SMarquez

Thread Starter

Tuned

Joined: Jun 2004

Posts: 319

Likes: 37

COP Diagnosis

I had my intake mani resealed/new gaskets a couple years a ago and am getting an intermittent miss and rough idle. I want to rule out a COP so my question is, will it throw a fault code and is it intermittent in it's bad behaviour. Thanks

Mar 27, 2012 | 06:32 AM

JWA

Fleet Owner

Joined: Aug 2010

Posts: 21,253

Likes: 1,656

From: Reynoldsburg, Ohio

Yes any misfire should throw a code, something in the P0350 range.

If the miss is intermittent though you can try pushing inward on the COP connector from the chassis wiring, checking if its making good contact. Sometimes the locking tabs on the harness connectors fail giving you a similar problem. They're easily replaceable with an NAPA part EC259 or something similar.

HTH

Mar 27, 2012 | 07:55 AM

TrdLtly

TreadLightly

Joined: Oct 2006

Posts: 1,608

Likes: 0

From: SE Missouri

Quote:

Originally Posted by SMarquez

All misfires "should' throw a code, but I also believe that you can have a weak spark that will sound like a misfire without throwing a code. By throwing a code it will not illuminate the SES (Service Engine Soon) light. You HAVE to check for codes and not assume that because the SES light is not lit that you don't have a code.

In the Tech Folder is a link to here: MustangForums.com - View Single Post - COP Information That should have all the information you would ever want to know about COP's.

Mar 27, 2012 | 09:45 AM

krewat

FTE Leadership Emeritus

Joined: Jul 2002

Posts: 42,561

Likes: 421

From: Long Island USA

Depends on the year of the truck - the 2-valve V10s with OBD-I will not light the check engine light, but MIGHT log a code that can be read with a reader.

Mar 27, 2012 | 09:59 AM

TrdLtly

TreadLightly

Joined: Oct 2006

Posts: 1,608

Likes: 0

From: SE Missouri

Quote:

Originally Posted by Krewat

Depends on the year of the truck - the 2-valve V10s with OBD-I will not light the check engine light, but MIGHT log a code that can be read with a reader.

True. I guess I should have clarified. I was referring more to the OP's 2000. As always, thanks Art.

Mar 27, 2012 | 10:00 AM

JWA

Fleet Owner

Joined: Aug 2010

Posts: 21,253

Likes: 1,656

From: Reynoldsburg, Ohio

Quote:

Originally Posted by Krewat

Depends on the year of the truck - the 2-valve V10s with OBD-I will not light the check engine light, but MIGHT log a code that can be read with a reader.

Of course this is correct---I was assuming OBD-II as the OP didn't list his truck year, that I can see anyway!

Thanks Krewart!

Mar 29, 2012 | 01:57 AM

SMarquez

Thread Starter

Tuned

Joined: Jun 2004

Posts: 319

Likes: 37

Thanks everyone. It is a 2000 2V. It has also had an intermittent SES in the past and is now showing SES light. I can use our mechanics code reader in the morning and see what it reads.