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running like crap after filling up with gas?

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Old 01-17-2012, 01:05 PM
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Default running like crap after filling up with gas?

Ok i bought a 94 formula about 2 weeks ago, car needed a trans and got that fixed I put about 1/2 tank of 93 octane gas in it and ran that through it, then I filled it up and topped it off with 93 octane. Started car up ran fine untill I pulled out on the road and anything over about 10% throttle would make the car jerk and knock. I creeped it home and about 6 miles into the trip it started running fine again?

Anyone got some clues?
Old 01-17-2012, 01:47 PM
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Maybe it's not getting enough fuel? Bad injectors of fuel pump? It's weird that it would wake up and run like normal at some random time though.
Old 01-17-2012, 02:17 PM
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I had a car that kinda acted like this and the tps was bad on it but it wasn't intermittent.
Old 01-17-2012, 02:19 PM
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It did hold 18.2 gallons of fuel. Maybe I ran it to low and got air in the line? I would think that would push the air out in a few seconds though
Old 01-17-2012, 02:23 PM
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if your fuel got too low, maybe you sucked some crap into your filter
Old 01-17-2012, 04:03 PM
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Would the filter unclog itself free driving 6 miles? Lol
Old 01-17-2012, 04:27 PM
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Originally Posted by Ls7colorado
Would the filter unclog itself free driving 6 miles? Lol
I would think that it really depends. If you sucked in something microscopic, then maybe. But anything of significant size, maybe not.
Old 01-17-2012, 05:33 PM
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18 gallons? i thought we only had between 15-16 gallons
Old 01-17-2012, 06:52 PM
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Is the car rated for 93? That's the question. Remember, octane only indicates its resistance to detonation (aka harder to burn the higher the number).
If it's tuned for unleaded, use that. If not, then maybe you should try putting octane booster in to see if it helps. Perhaps the gas station had a shitty mix of gasoline.
Old 01-18-2012, 05:20 AM
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I thought all lt1s required premium fuel without making the computer remove timing?

and i thought 18 gallons seemed like ALOT
Old 01-18-2012, 08:41 AM
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Originally Posted by Ls7colorado
It did hold 18.2 gallons of fuel.
This would defy all known rules of mother nature and physics. I wonder if the pump you were using was bad. Or... maybe the pump ran long because the station's tank was low and it was pumping air as well as gas. When this happens, you get a bunch of garbage from the bottom of the tank in your gas. (This is not good.)

Originally Posted by Ls7colorado
I would think that would push the air out in a few seconds though
Any air put in the tank would vent out. The pickup also captures sloshing fuel so that it doesn't pump air in to the system - so you should be OK here.


I'd recommend running the tank out of gas, then changing your fuel filter, and then filling up at another station and see what happens.
Old 01-20-2012, 08:32 AM
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Looks like that's what I'll do i haven drove it any since then but it will get drove on the weekends alot. I'll see how it goes.



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