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Trying to save gas...


 
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TheBrat97
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Joined: 28 Jul 2006
Location: Dallas, TX

PostPosted: Fri Nov 16, 2007 12:53 am    Post subject: Trying to save gas... Reply with quote

This is probably a stupid question, but what are some of the possible consequences if I were to disconnect a fuel injector or two and run it like that for awhile?
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kaos
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Joined: 10 Jan 2006
Location: Iceland

PostPosted: Fri Nov 16, 2007 2:02 am    Post subject: Reply with quote

Hmm, hopefully somebody with more expertise will chime in, but here is what I think would happen:

1. Horribly uneven running, possibly bad enough that the car wouldn't idle. In effect, the engine would be missing on one or two cylinders.
2. The "unused" cylinders would pump great quantities of air into the exhaust system, leading to:
3. The O2 sensor would read "lean", leading the ECU to pump more fuel into the remaining cylinders. This would lead to:
4. Masses of unburnt fuel making it's way into the catalyst, which would:
5. Promptly overheat, possibly even causing a fire, but in any case being damaged in short order.

Another side effect would be loss of power, even more than that explained by losing a cylinder or two, due to the over-rich mixture in the remaining cylinders. Also, fuel consumption would skyrocket, also due to the over-rich mixture.

All this is assuming that the ECU would maintain a closed loop mode. Actually, it probably wouldn't. It would just throw an "O2 sensor reading lean" code, and henceforth ignore it's readings. This would still lead to loss of power and increased fuel consumption, but probably not as badly as otherwise.

Regards,
Kári.
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ThePhantum
Pissed-Off Admin
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Fri Nov 16, 2007 4:08 am    Post subject: Reply with quote

The ECU would probably flip out...it will throw injector control and cylinder misfire codes. It would also throw at least one O2 sensor code...but it might throw multiples: lean, voltage and/or response. All of that would most likely cause the ECU to go into "Limp In" mode. Basically, the ECU ignores sensor data and "guesses" to compensate for a failure. The purpose of which is to allow you to get the car to a mechanic. One major symptom of this is losing third and/or fourth gear on autos.

So essentially: it would run like crap, burn lots of fuel, turn on the check engine light and you would lose high gear.
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quadna71
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Joined: 02 Jan 2004
Location: Delaware

PostPosted: Fri Nov 16, 2007 4:41 am    Post subject: Re: Trying to save gas... Reply with quote

TheBrat97 wrote:
Trying to save gas...


buy a car. i picked up my honda for cash and get 38mpg. 25,XXX later it still runs great!
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lakeland713xj
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Joined: 04 May 2007
Location: middle of no where florida

PostPosted: Fri Nov 16, 2007 5:01 am    Post subject: Reply with quote


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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Fri Nov 16, 2007 11:39 am    Post subject: Reply with quote

since those cylinders would essentially be dead weight, the engine would make the other cylinders work harder to make up for it. So actually you burn more fuel
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berk9
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Joined: 16 Apr 2007
Location: Waynesboro VA

PostPosted: Fri Nov 16, 2007 1:13 pm    Post subject: Reply with quote

you would lose so much power in fact your jeep would be retarded. literally. i was at tellico with a friend and he rolled his jeep on school bus. took the sparks out to check em and get the oil out of the heads. 2 or 3 spark plugs got f'd and didnt work. ran so bad that in 4 low first gear he would stall out. in a rubicon. sounded like a dying old popin johny. (old john dear tractor)

try taking out your front drive shaft. fox seemed to think it helped his gas out a lot
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Fri Nov 16, 2007 8:30 pm    Post subject: Reply with quote

yea picked up a mile or two to the gallon
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Brad The Best
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Joined: 14 Jan 2007
Location: Kamloops B.C Canada

PostPosted: Fri Nov 16, 2007 11:03 pm    Post subject: Reply with quote

probably the worst part is the wear you would get on your engine from it running so cold . hopefully its already worn out enough that it wouldn't cold seize or have the head warp .

just drive like a pussy and draft everyone .

its slow but i can drive around with out going over 1500 rpm untill i hit the high way . you just have to go easy on her .
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tag
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Joined: 16 Jul 2006
Location: leeds yorkshire england

PostPosted: Sat Nov 17, 2007 1:40 pm    Post subject: Reply with quote

Why is the fuel expensive over there? Confused
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'drack
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Joined: 01 Jan 2004
Location: points that way...

PostPosted: Sat Nov 17, 2007 3:25 pm    Post subject: Reply with quote

See, what I've been doing is turning off the Jeep going down hills to save gas is turning off the Jeep while going down hills. I let it coast then 'til it's about to come to a stop and then crank her over again. Yeah, the steering is a bit hairy 'til I get the power steering back again and it takes me a bit longer to get somewhere, but ya gotta pay to play...........true story flipoff agree .
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DavidXJ
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Joined: 07 Sep 2006
Location: Visalia, CA

PostPosted: Wed Nov 21, 2007 12:52 pm    Post subject: Reply with quote

I just wanted to congratulate lakeland713xj on his most subtle but entertaining reply. People are looking at me funny for laughing out loud (I refuse to use "LOL"... @#$%!! abbreviations).
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