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Old 05-20-2008, 05:54 PM   #1 (permalink)
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How to make my 4 banger a 3 cylinder

Just wondering how feasible it would be to cut one of the cylinders off from the ignition sequence to maybe try and save some fuel.

I know that I have enough power to afford to lose one of the cylinders, but I was talking to a friend of mine who is a Lexus mechanic (for those less informed, lexus and toyota are the same thing mechanically), and he said that if I just removed the spark plug, the injectors would still be dumping in fuel and I would just have a dash light on to annoy me for my efforts, so I wouldn't save any fuel. The only thing he said that might work is if you somehow plugged up the injector for the 4th cylinder, but as to how to do that, I have no idea. He also mentioned that if I did that, the other cylinders might start dumping extra fuel in to compensate for the lose in compression from the one cylinder...but since he has never had anyone try it that he knows of, he doesn't know exactly what would happen.

Can anyone give some more insight into the feasibility of this mod, if there is any?

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Old 05-20-2008, 06:06 PM   #2 (permalink)
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Ok, thanks for the info. Just wanted to clear that up. I figured it wouldn't run right, but who knows, I can dream can't I?
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Old 05-20-2008, 06:08 PM   #3 (permalink)
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Old 06-08-2008, 10:38 PM   #4 (permalink)
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Did you find out if this will work or not?
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Old 06-09-2008, 12:46 AM   #5 (permalink)
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No, that won't save gas unless you takeout a couple pistons, rods, and their valve actuating components, plus unplug the injectors.

Here is a thread on the subject.
http://ecomodder.com/forum/showthrea...ssion-968.html

Last edited by diesel_john; 06-09-2008 at 12:51 AM..
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Old 10-15-2008, 12:03 PM   #6 (permalink)
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Chrysler has done this effectively. I know that the new Grand Cherokee has a V8 that with MDS can turn off 4 of the cylinders when not needed. here is a link Jeep - 2009 Jeep Grand Cherokee - Capability - Powertrain and it is the hemi with MDS

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Old 10-15-2008, 07:16 PM   #7 (permalink)
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If you unplug the electrical connector from one injector, and somehow fool the engine management system into thinking it's still plugged in, you would save some gas. But the engine would run quite roughly and unevenly--possibly enough to damage it over the long haul. One advantage of the engines that are designed for cylinder deactivation is that they can set up the remaining cylinders to fire at even intervals, but killing one cylinder of a four-banger and leaving the other three as they were is going to have the engine shaking like crazy.

If you cannot fool the EMS into thinking the injector is still there, the engine will likely go into "limp-home mode", which traditionally means a nice safe rich mixture. Which won't be so good for your fuel economy, or for your engine either over the long haul.

-soD
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Old 10-15-2008, 09:00 PM   #8 (permalink)
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Old 10-15-2008, 10:36 PM   #9 (permalink)
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my moms lumina blew out a spark plug and it ran like crap and it sounded like a big machine from some cartoon....KA-CHUNKA WHUMPA WHUMPA!!! KPPPPPHTTTTT
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Old 10-16-2008, 04:30 AM   #10 (permalink)
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i broke a plug wire while fourwheeling once, and it ran ok at best, ideled rough but ran fine other wise power loose was there i would test with un plugging the injector and tapeing the end first, just to see.

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