My Tuning Issue Seems to Be A COP issue. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


ECUs and Tuning Discuss Engine Management, Tuning, & Programming

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 08-06-2014, 12:47 AM   #1
Senior Member
Thread Starter
 
Join Date: Apr 2008
Location: NHR, TX
Posts: 536
Total Cats: -2
Default My Tuning Issue Seems to Be A COP issue.

After driving the car to class today to see if I could sort out the fuel map, I couldn't get over the fact the car sounded like it was running on 3 cylinders. So I pulled a connector on the front COP and the car started to die. I put it back on and pulled the second. Again the car sounded like it was going to die, and I could hear the coil firing on both one and two. Then I pulled the connector on the third, no change. So I pulled the connector on the 4th COP and again, no change. So I swapped the assumed non working COP's to the front two cylinders and tried again. The results were the same but in the reverse order. Based on this I'm guessing my harness is fine, but maybe I had two COP's die at or around the same time? Does that happen often? And more surprising is that my car can run on just two cylinders.
apariah is offline   Reply With Quote
Old 08-06-2014, 08:39 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,908
Total Cats: 1,793
Default

should be able to feel/hear them working. (use a screwdriver and put your ear to it)

if you have a mspnp2, you can use the output test mode to fire them off without the car running to really narrow it down.
Braineack is offline   Reply With Quote
Old 08-06-2014, 12:45 PM   #3
Senior Member
Thread Starter
 
Join Date: Apr 2008
Location: NHR, TX
Posts: 536
Total Cats: -2
Default

I can hear the two working COP's clearly. The other two aren't making a sound.

Quote:
Originally Posted by Braineack View Post
should be able to feel/hear them working. (use a screwdriver and put your ear to it)

if you have a mspnp2, you can use the output test mode to fire them off without the car running to really narrow it down.
apariah is offline   Reply With Quote
Old 08-06-2014, 12:50 PM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,908
Total Cats: 1,793
Default

what happens when you swap coils around?

having #3 and #4 both not work is odd, not what I'd expect.

I'd expect you to not have 1&4 or 2&3
Braineack is offline   Reply With Quote
Old 08-06-2014, 12:57 PM   #5
Elite Member
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,011
Total Cats: 583
Default

COPs do die. Fords are known for this. Also, you need to use a different dwell setting for COPs than for OEM coils (look at Brain's COP sticky). If you didn't do this, then early death will result.
hornetball is offline   Reply With Quote
Old 08-06-2014, 04:56 PM   #6
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Quote:
Originally Posted by Braineack View Post
what happens when you swap coils around?

having #3 and #4 both not work is odd, not what I'd expect.

I'd expect you to not have 1&4 or 2&3
If there were a problem with a spark output channel, you'd be correct. Coils are wear items though, and their finite life can be brought to immediate end if not properly configured.
Ben is offline   Reply With Quote
Old 08-06-2014, 05:29 PM   #7
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,468
Total Cats: 785
Default

When they die/are in the process of dying, will their problems be exacerbated by bumps/vibrations? I know it sounds silly, but i'm trying to avoid pulling the entire damn car apart to find a wiring issue.

Chasing a misfire on our car right now that seems to happen sometimes over bumps, and this past monday it fired up on what sounded like 2 cylinders. Opened the hood, checked plugs and such, but didn't unplug anything since i was trying to get home. Shut hood, car magically ran fine.

Has never once misfired under boost. Have heard that weird things can happen when these Denso COPs start to get old.
concealer404 is online now   Reply With Quote
Old 08-06-2014, 06:12 PM   #8
Senior Member
Thread Starter
 
Join Date: Apr 2008
Location: NHR, TX
Posts: 536
Total Cats: -2
Default

The car runs rough, although drivable until I pull one of the working coils. Even after reconnect the working coil the engine can't recover and dies. If I pull one of the non working coils nothing happens. The sound and RPM stay the same. Like I said I'm a little shocked the car will run on only two cylinders. Not well but it runs and is drivable.
apariah is offline   Reply With Quote
Old 08-12-2014, 09:53 PM   #9
Senior Member
Thread Starter
 
Join Date: Apr 2008
Location: NHR, TX
Posts: 536
Total Cats: -2
Default

The new coils are in, and the car sounds far better. I'm looking at the COP sticky to make sure my dwell is correct before I start working on tuning.
apariah is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:02 PM.