RF/EMI Effects on a computer.......cool stuff check this out
Thread Starter
9 Second Club
iTrader: (7)
Joined: Dec 2008
Posts: 4,464
Likes: 12
From: Rhode Island
RF/EMI Effects on a computer.......cool stuff check this out Been having some misfiring issues with my car and i think i just stumbled across the issue.........i decided to drive the car to work this afternoon and data log the whole drive and see if i could find anything.........sure enough 14 minutes in i get this picture on the graph...........now this took place over a duration of only 85mS so it was tough to see i stubled across it durring zooming in.........if the noise was less that 50ms my data logger wouldn't have picked it up yet the ecu would have processed it..........i got lucky i caught one big enough to see...........looks like a false voltage is being induced on my cam trigger wires and causing the xfi to get a bad reading..........you can see the timing goes so far out of wack for that split second that the motor nearly shuts off and I audibly heard the motor stumble when this happened. Look at the 156* in the cam sync and the 1.75AFR!!!! Looks like grounding my unused inputs and re-routing a sheilded cable may be the answer......figured id share this i found it interesting........
heres the pic from the data log on the CCom software..........
heres the pic from the data log on the CCom software..........
Thread Starter
9 Second Club
iTrader: (7)
Joined: Dec 2008
Posts: 4,464
Likes: 12
From: Rhode Island
Thread Starter
9 Second Club
iTrader: (7)
Joined: Dec 2008
Posts: 4,464
Likes: 12
From: Rhode Island
Trending Topics
TECH Fanatic
Joined: Feb 2006
Posts: 1,025
Likes: 1
From: CT/NJ
That isn't much to go on but at least you now know one channel that is being effected.
You aren't using non-resistor spark plugs or wires by any chance, are you? Those are the common causes of RFI/EMI I have found over time and a ton of bashing my head against the wall. Also, a poor alternator will do it...
You aren't using non-resistor spark plugs or wires by any chance, are you? Those are the common causes of RFI/EMI I have found over time and a ton of bashing my head against the wall. Also, a poor alternator will do it...
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Thread Starter
9 Second Club
iTrader: (7)
Joined: Dec 2008
Posts: 4,464
Likes: 12
From: Rhode Island
That isn't much to go on but at least you now know one channel that is being effected.
You aren't using non-resistor spark plugs or wires by any chance, are you? Those are the common causes of RFI/EMI I have found over time and a ton of bashing my head against the wall. Also, a poor alternator will do it...
You aren't using non-resistor spark plugs or wires by any chance, are you? Those are the common causes of RFI/EMI I have found over time and a ton of bashing my head against the wall. Also, a poor alternator will do it...
yea the box is farrrrrr away from the xfi and all the other stuff as is the coil but im going to reroute some sheilded cable away from plug wires and stuff to make this work better...........and im always open to ideas.......just because im an EE doesn't mean i know everything lol.....
it looks like it's sampling at 10/sec? I do 10-20 on mine, but sometimes I got problems with the serial adapter causing it to lose connection at 20. That usually happened only between the burnout and staging 
