Stealthy injector kill switch, 6th Generation Civic

[steffen707]

Originally Posted by PaleMelanesian

We've found a couple external studies that range from 7 to 15 seconds of idle fuel for a key start.

Okay, so a general rule of thumb, you should always bump start the car before a stop if you will be stopped less than 7 seconds?

[steffen707]

This is a very close copy to what california98civic has done, and I want to thank him for starting this thread. Great work!

Here's what i came up with because I couldn't find the same switch. I bought these off ebay eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices


They were pretty cheap. And I bought an auto gear shifter from a 96-00 civic from the junk yard pick and pull. That cost me 5 bucks.

I went to the hardware store and bought these. They're 7/8 outer diameter. They just fit inside the rubber cover of the shifter but won't fit inside the plastic main hole. I then drilled a 1/4" hole in the center of the metal washer to get the switch inside there.


I bought these 25/32" rubber gaskets in the plumbing section of Menards. They just fit inside the main hole. I drilled out a 1/4" hole for this one as well and sandwiched it between the metal washer and the body of the switch. Finally I drilled out another rubber gasket and fit it around the body of the switch behind the threads.


This assembly will just fit inside the shifter, but for added snug effect, I put a piece of electrical tape around the two rubber gaskets so I had to squeeze it into the shifter. With this friction and the fact that every time you push the button it forces the switch into the hole, I've not had it pop out yet.



I solder and heat shrink covered 2 wires to the leads and ran them down the bottom of the shifter. I wraped a little bit of electrical tape around the shift rod and just pushed the shifter over the tape. It doesn't wiggle anymore, and will turn a little bit left and right if you twist the shifter, but its pretty solid. I then ran those 2 wires to the main relay and tapped into the ground wire like california98civic did. Works like a charm. Havn't had any issues with the setup yet. I was worried the switch was too small and might not handle the amperage (not exactly sure if electricity goes through the ground wire or not), but it hasn't failed yet.

I forgot to take a picture of the assembly before I put it into the shifter, but maybe I'll pull it out and snap some pics for you guys if you're interested.

On a final note, i used bullet connectors for the switch wires and the cut ends of the ground at the main relay. If something does happen, I can always unplug the bullet connectors and then plug them back together(even on the side of the road), so it will operate like stock. Make sure one end of your cut wire is the male end, and one is the female, otherwise you'll have 2 holes or 2 sticks, and that doesn't work (electrically, "not that there's anything wrong with that" sexually.....Funny quote was that Seinfeld?).

[steffen707]

I just went back and looked at the first page of this thread. I didn't realize you used a washer as well. I thought you found a switch that perfectly fit into the hole. Basically i completely copied you. And if somebody didn't want to use the rubber gasket, you could just wrap a ton of electrical tape around the barrel of the switch until its just a bit tight.

This setup is super slick though and I love the factory look. Even if you don't have a civic, you can use the civic shifter mod on your car with similar results.

[California98Civic]

Originally Posted by steffen707

I just went back and looked at the first page of this thread. I didn't realize you used a washer as well. I thought you found a switch that perfectly fit into the hole. Basically i completely copied you. And if somebody didn't want to use the rubber gasket, you could just wrap a ton of electrical tape around the barrel of the switch until its just a bit tight.

This setup is super slick though and I love the factory look. Even if you don't have a civic, you can use the civic shifter mod on your car with similar results.

Totally cool. Thanks for the pics. I had thought of using black caulk to plug up that hole for the screw on the auto trans selector, but my caulk dried up and I'm too cheap on that minor point. Well... back to work, lunch over! (hear that, employer of mine?)

[1carnut]

Copied this one myself. I found the original switch that was pictured in the first post. It is a Dorman (85931) universal switch. I got it from Amazon for $9. Instead of taking the cover off of the side and unbolting the relay, I just unplugged it and pulled it down to do the wiring. Not a lot of wiring to work with but got it done. Love a good write up with pictures!

[toc]

Won't the ECU identify the fuel cut as lean running and adjust STFT and LTFT because of it?

[California98Civic]

Originally Posted by toc

Won't the ECU identify the fuel cut as lean running and adjust STFT and LTFT because of it?

Does not seem to be the case. Been running this thing for nearly two years. Passed California smog test 6 or 8 months ago.

[toc]

OK, and how long pressing the switch does it take for the engine to stall (i.e. you won't use it in DFCO) - so it's best usage is on flat straights where cruising down from speed to prevent injector operation..

Or am I missing something?

What MPG improvement would you associate with this mod in a percentage?

[bestclimb]

Originally Posted by toc

Won't the ECU identify the fuel cut as lean running and adjust STFT and LTFT because of it?

Nope. It does not "lean out" it just stops running. I also ran this setup for about two years prior to selling the car.

The engine took the same amount of time to die as turning off the key. attributed about 10% of my gains on the civic to this mod alone most of the rest to the MPGuino. (Had this and a grill block on the civic)

I used it in pulse and glide, coasting down hills, Any slight down hill (you would be amazed how many you find when looking), Any bend in the road you would naturally slow down for, etc.

[Mista Bone]

Originally Posted by California98Civic

Does not seem to be the case. Been running this thing for nearly two years. Passed California smog test 6 or 8 months ago.

Now I have something to read about!!!!

Blundar (PGMFI.org) didn't think just killing the injectors would work and the ECU would freak out.

Question: What are you doing with the throttle when cutting the fuel?

On my old car I had adjusted the TPS so that I could crack open the throttle while coasting down in gear, ECU had shut off the injectors but the cracked throttle didn't allow the engine to slow the car as much, hence farther coasting. Aprrox 13 miles was my record for longest coast. Great Smokey Mountains from Newfound Gap down to Cades Cove....