Coil Question
Thread Starter
Racer
Joined: Aug 2002
Posts: 369
Likes: 11
From: NV
Coil Question
Having CONTINUED issues with gremlins, but in the process of sorting it through I have come across yet another issue, this at the coils.
From my readings it appears that the C5 computer controls traction via a combination of systems, one being the coils. It can apparently shut off the spark temporarily to a given coil as it decreases torque.
That being said......after changing plugs I noticed a misfire. I tracked it to a "dead" coil. Put new wires, no change. Swapped out the "bad" coil for a "good" coil and found it was not the coil at all.
My question to you all is this:
With the car sitting at idle what are the chances that the computer has shut off the juice to this particular coil? As in a malfunction in the TCS? Can that happen? Or is a cracked wire in the loom more likely?
From my readings it appears that the C5 computer controls traction via a combination of systems, one being the coils. It can apparently shut off the spark temporarily to a given coil as it decreases torque.
That being said......after changing plugs I noticed a misfire. I tracked it to a "dead" coil. Put new wires, no change. Swapped out the "bad" coil for a "good" coil and found it was not the coil at all.
My question to you all is this:
With the car sitting at idle what are the chances that the computer has shut off the juice to this particular coil? As in a malfunction in the TCS? Can that happen? Or is a cracked wire in the loom more likely?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
ANSWER: Almost ABSOLUTY NOT!! To properly troubleshoot this coil issue,, you are going to need a Volt/OHM Meter. You can make sure that you have GROUND (Black wire), Power (pink Wire) AND SIGNAL low reff and the Coil fire signal. The fire signal can be properly detected with an old points DWELL METER.
You may be able to see the signal on the AC Scale but, it will be a low voltage reading.
When I get home tonight, I will post the schematics for the all the coils.
You also need to check the voltage and low reff to the fuel injectors.
You may be able to see the signal on the AC Scale but, it will be a low voltage reading.
When I get home tonight, I will post the schematics for the all the coils.
You also need to check the voltage and low reff to the fuel injectors.
Thread Starter
Racer
Joined: Aug 2002
Posts: 369
Likes: 11
From: NV
Fixed it earlier today.....wire. But mainly my question was exploring the possibility of a connection due to the current gremlin king living in my car!
Bill, PM me if you have time and don't mind me picking your brain.
Bill, PM me if you have time and don't mind me picking your brain.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
The traction control system uses several methods to control wheel spin at launch and TQ limiting at shift (A4) they are : spark--fuel flow--throttle position
As far as spark is concerned---It does not shut power off to the coils --it simply removes timing from your ignition system---
However there is a time when ALL the coils "could" be shut down---When decelerating the DFCO system kicks in ( decel fuel cut-off) Not quite sure but i think that here the spark is powered off as well----Anyone else know for sure ?????
As far as spark is concerned---It does not shut power off to the coils --it simply removes timing from your ignition system---
However there is a time when ALL the coils "could" be shut down---When decelerating the DFCO system kicks in ( decel fuel cut-off) Not quite sure but i think that here the spark is powered off as well----Anyone else know for sure ?????
