Kill switch questions - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 06-26-2008, 02:40 PM   #1
Registered Member
 
Join Date: Mar 2008
Posts: 4
Country: United States
Kill switch questions

I have a 1999 civic lx and I am wondering the best method of installing a kill switch. I'd prefer to not kill the gas pump as seen on another thread in this forum because it is not an instant kill. I'm open to suggestions.


Thanks
__________________

__________________
r3tic is offline   Reply With Quote
Old 06-26-2008, 03:37 PM   #2
Registered Member
 
suspendedhatch's Avatar
 
Join Date: Apr 2008
Posts: 445
Country: United States
Send a message via AIM to suspendedhatch
It's not an instant kill because there is residual fuel pressure in the lines. When you shut off your car normally, this residual pressure remains for several hours until it feeds back into the charcoal canister.

You could kill the ignition but it's a higher amperage circuit so a relay is required. It would be identical to an alarm's start kill relay, the only difference is that you're putting it on the ignition wire and using a manual switch to control the relay instead of a ground output from the alarm.
__________________

__________________

Civic VX, D15Z7, 5 Speed LSD, AEM EMS, AEM UEGO, AEM Twin Fire, Distributor-less, Waste Spark
suspendedhatch is offline   Reply With Quote
Old 06-26-2008, 03:41 PM   #3
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
I'd like to hear this too...I want to install one in my 2008 VW Rabbit.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 06-26-2008, 10:30 PM   #4
DRW
Registered Member
 
Join Date: Oct 2006
Posts: 615
Country: United States
Kill the injectors.
I don't know how it is on your car, but my car uses a common ground for all 4 injectors. One wire, one switch. The injectors only see 12 volts and low amps, so no relay is needed. Just make sure you wire up the switch with male/female plugs located in a convenient spot just in case the switch fails you can plug the injectors back in.
__________________
Dave W.
DRW is offline   Reply With Quote
Old 06-27-2008, 05:54 AM   #5
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
I would definitely use a nice connector, since I want it to be easy to return to stock. Good idea on the common ground, both my vehicles use a common ground on all injectors.

Would killing the injectors throw a code?
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 06-27-2008, 08:06 AM   #6
Registered Member
 
GasSavers_bobski's Avatar
 
Join Date: May 2007
Posts: 463
Country: United States
Quote:
Originally Posted by suspendedhatch View Post
When you shut off your car normally, this residual pressure remains for several hours until it feeds back into the charcoal canister.
The charcoal canister stores fuel vapor from the gas tank. It has nothing to do with the fuel pump, injectors or liquid fuel lines.
Residual pressure is supposed to remain in the lines as long as possible, to help with starting... there's a check valve in place to help with that. Unfortunately, the check valves aren't perfect, and wear out with time, allowing pressure to bleed back through the fuel pump to the tank.

Quote:
Originally Posted by suspendedhatch View Post
You could kill the ignition but it's a higher amperage circuit so a relay is required.
Not really. You just need a switch that's rated properly for the power draw. I can't speak for other makes, but r3tic's Civic would throw an ignition system error code if you cut power to the distributor.

Quote:
Originally Posted by theholycow View Post
Would killing the injectors throw a code?
Again, I'm familiar with Hondas mostly, but in all likelyhood, yes.


So... What's wrong with flipping off the existing ignition switch, anyway?
GasSavers_bobski is offline   Reply With Quote
Old 06-27-2008, 08:11 AM   #7
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Quote:
Originally Posted by bobski View Post
So... What's wrong with flipping off the existing ignition switch, anyway?
It's connected to a lot more things than just the engine.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 06-27-2008, 08:27 AM   #8
Registered Member
 
suspendedhatch's Avatar
 
Join Date: Apr 2008
Posts: 445
Country: United States
Send a message via AIM to suspendedhatch
Good call on that first one bobski. Something didn't feel right about it when I posted it.

Cutting the ignition on a Honda doesn't throw a code but it makes your battery light and engine light come on just like you've stalled.

I recommend a relay over a high amperage switch for reliability and also so you're not spiking the circuit every time you cut the ignition. You can buy a pre-wired base for the relay that already includes the diode, or you can wire it yourself. It's cheap and easy insurance.
__________________

Civic VX, D15Z7, 5 Speed LSD, AEM EMS, AEM UEGO, AEM Twin Fire, Distributor-less, Waste Spark
suspendedhatch is offline   Reply With Quote
Old 06-27-2008, 08:27 AM   #9
Registered Member
 
Join Date: Mar 2008
Posts: 4
Country: United States
I'd rather not use the inition switch for a couple of reasons. First of all, there is always the chance of turning the key back too far. Secondly, I have only owned two Hondas, 95 Del Sol and this Civic, but the key sits a little looser in the ignition than with my Del Sol and I'd hate to cause any additional wear and have to replace the ignition.

The injector kill seems to be the best method, is there anyway to find out if this would throw an error code without actually cutting wires? Or is there a method that would not throw a code?
__________________
r3tic is offline   Reply With Quote
Old 06-27-2008, 09:43 AM   #10
Registered Member
 
GasSavers_RoadWarrior's Avatar
 
Join Date: Feb 2008
Posts: 1,652
Look see if you have an ASD (Auto Shut down) relay, play with that.

I've heard that on some vehicles, when they flood and won't start, pushing the gas pedal right to the floor and cranking cuts the injectors. Could find what sensor/switch inputs trigger that and fudge them.
__________________

__________________
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Criteria for getting and staying on the overall histogram Codyroo Fuelly Web Support and Community News 1 07-06-2012 05:58 AM
Allow Us to Email to Fuelly Our Updates? TNTDJ Fuelly Web Support and Community News 1 01-04-2011 01:13 PM
Question on fuel cutoff during coast Rick Rae General Fuel Topics 3 08-20-2007 08:19 PM
Regenerative braking??? 80cvcc General Fuel Topics 5 07-19-2007 11:06 AM
1988 CRX DX (the Bantam) GasSavers_Jack For Sale 6 09-08-2006 05:59 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 10:18 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.