F355 Intermittent no spark-misfire on the 5-8 bank - Ferrari Life
 
LinkBack Thread Tools Display Modes
post #1 of 6 Old 06-03-2015, 04:31 PM Thread Starter
Owner
Sponsor
 
David @ FluentInFerrari's Avatar
 
Join Date: Feb 2009
Location: Sarasota FL
Ferrari Life Posts: 962
Intermittent no spark-misfire on the 5-8 bank

OBD-I car. This was a tough one to find, as there were no codes,and the SD-2 tester revealed no faults. I could see the trigger waveform on my Picoscope, but the signals were noisy and low in amplitude. All of the coil and ECU voltage and resistance tests indicated no problems. Yet, backfires were noted almost immediately after 10-15 seconds of running. Fuel pressure tested within specs. A compression test done and was within the normal ranges. So what's left? Sometimes, pictures do speak a thousands words. Note that this "stuff" is on the component end, not the harness side. During the recent major service, any corroded connectors/torn boots were replaced.

Soon to be happy client...and yet another F355 due in on Monday. Yes, you guessed it. The CEL is on.
Attached Images
 

Sarasota Italian Garage, LLC
Sarasota, FL
www.fluentinferrari.com
[email protected]

**An independent facility with no affiliation with Ferrari SpA**
David @ FluentInFerrari is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 06-03-2015, 04:36 PM
Owner
 
dave rocks's Avatar
 
Join Date: Nov 2012
Location: Orchard Park, New York
Ferrari Life Posts: 1,872
Garage
Dave, I appreciate and I'm sure other will appreciate you posting this. Michael is going to be happy once he can drive the car

For anyone that does not know Dave, he is a stand up guy and always willing to help.
dave rocks is offline  
post #3 of 6 Old 06-04-2015, 11:47 AM
Owner
 
Join Date: Dec 2009
Ferrari Life Posts: 54
Nice find! Thanks for sharing the pic.
INTMD8 is offline  
 
post #4 of 6 Old 06-04-2015, 01:20 PM
Owner
 
john85QV's Avatar
 
Join Date: Aug 2010
Location: New England CT
Ferrari Life Posts: 153
TDC/RPM sensor? Did you replace the sensor or just clean the contacts?


My buddy has a Toyota pickup. Same as mine but two years newer. We both had P0420 CELs, (Cat below efficiency). Mine from a crack exhaust pipe just after the cat letting air into the exhaust. His, a bad O2 sensor. It's not just a Ferrari thing.

If you are going to tell someone how to remove a bolt you should at least know which way to turn the wrench.
85 308 GTB QV red/tan (original owner)
95 F355 Spider SwatersBlu/tan
john85QV is offline  
post #5 of 6 Old 06-04-2015, 03:26 PM Thread Starter
Owner
Sponsor
 
David @ FluentInFerrari's Avatar
 
Join Date: Feb 2009
Location: Sarasota FL
Ferrari Life Posts: 962
Yes, it was the 5-8 bank crank trigger. I cleaned it, but later replaced it. Lesser corrosion was found at the coil and coil amps. Again cleaned, but no need for replacement. I've had my fair share of cat efficiency codes. Sometime the diagnosis is easy, sometimes not so much...As I suspect you know quite well, the "code" rarely is the problem, but rather the "result of..:"

Sarasota Italian Garage, LLC
Sarasota, FL
www.fluentinferrari.com
[email protected]

**An independent facility with no affiliation with Ferrari SpA**
David @ FluentInFerrari is offline  
post #6 of 6 Old 06-05-2015, 07:12 PM
 
Join Date: Mar 2015
Location: upstate sc
Ferrari Life Posts: 74
Thank you posting.
emac is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
Copyright 2012 ONE Media, Inc.
FerrariLife is independently run with no affiliation with Ferrari SpA
Ferrari for Sale | Maserati for Sale