LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

BAD gas mileage, running rich, HELP

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Old Mar 11, 2004 | 07:58 PM
  #1  
tagz's Avatar
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Joined: Jan 2004
Posts: 325
From: jersey
Question BAD gas mileage, running rich, HELP

So i'm getting about 8.7 miles to the gallon!!! Thats absolutly horrible.

I was floorin it half the time, but that should still only bring me up to 10, maybe 11 if i'm lucky. Still not good. Any one have any idea what might be causing this?

I am running rich, about 10 percent. (ranges from 5-15 percent) The right side tends to run alittle more rich then the left. I scanned it with DATAMASTER, anyone who is good with reading this stuff, and could help me determine the problem... heres the file

Datamaster: http://angelfire.com/biz4/tagz/datamastergas.uni
Speadsheet: http://angelfire.com/biz4/tagz/gas.csv

Note: I changed the spark plugs about 200 miles ago. Was not running this rich before I changed them.
Old Mar 11, 2004 | 08:06 PM
  #2  
z28Power's Avatar
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Joined: Apr 2000
Posts: 269
From: Las Vegas, NV
When you changed your plugs, did you gap everything properly?

I know it's a stupid question, but it could help out.

You could also check to see if you have any spark arcing to the motor. I've heard of people having luck starting the motor when ti's pretty dark and checking for the arcing that way, it's pretty visible.

Haven't actually had an issue like this, but just giving you some info based on issues I've seen resolved in the past.

Maybe one or some of the plugs managed to back out a bit?

What do you think, your message was somewhat vague so I wanted to through a few things out there.
Old Mar 11, 2004 | 08:20 PM
  #3  
dougy147's Avatar
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Joined: Nov 2000
Posts: 11
From: the woods
from what i can tell from your data you either have a cylender or 2 not fireing on the right bank or a bad 02. the injector pulse readings are the same for both sides so you have the same amount of fuel going in on both, you just have to figure out why it's comming out of the right bank instead of burning. I would lean more toward the not fireing rather than a bad o2 because of the really bad gas mileage. thats what i got out of it anyway, good luck
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