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September 9th, 2010, 04:32 PM
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#1
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Registered User
Join Date: Jun 2010
Location: Charlotte, NC
Posts: 4
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Recommended fuel
What is the recommended octane for a stock 95 lt1? I put in 93 and it ran like shit. I was told 93 was to much but it says premium octane recommended. please help.
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September 9th, 2010, 07:03 PM
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#2
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4th F-Body Poser
Join Date: Sep 2010
Location: ohio
Posts: 125
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If the owners manual says 87 octane is recommended, then I sure would try 87 octane for at least 3 or 4 tanks and if it still runs like shit - then it might be something mechancial.
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September 9th, 2010, 11:02 PM
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#3
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4th F-Body Newbie
Join Date: Jul 2010
Location: Fairless Hills, Pa
Posts: 54
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i heard that older 4th gen need the computer reset or at least a couple tanks fulls of a new octane to adjust. Pull the battery cable or wait it out.
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September 10th, 2010, 03:11 AM
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#4
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Moderator
Join Date: Jan 2010
Location: earth
Posts: 135
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Premium, if its running like shit its not the gas. But yea if someone was running crap gas in it the PCM may be adjusting.
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September 10th, 2010, 04:07 AM
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#5
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4th F-Body Groupie
Join Date: May 2010
Location: Jacksonville, FL
Posts: 219
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Quote:
Originally Posted by 99Hugger
Premium, if its running like shit its not the gas. But yea if someone was running crap gas in it the PCM may be adjusting.
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 If I’m not mistaken premium is recommended for ALL V8 4th gens. Both my 95 and 00 say premium fuel only, anything less will cause knock.
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hondas are like tampons... every pussy has one!
 
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September 10th, 2010, 04:09 AM
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#6
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4th F-Body Groupie
Join Date: May 2010
Location: Jacksonville, FL
Posts: 219
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Quote:
Originally Posted by 024mula
If the owners manual says 87 octane is recommended, then I sure would try 87 octane for at least 3 or 4 tanks and if it still runs like shit - then it might be something mechancial.
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Ive never seen an LS1/LT1 that recommened 87 
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hondas are like tampons... every pussy has one!
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September 10th, 2010, 09:18 AM
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#7
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4th F-Body Groupie
Join Date: Jan 2010
Location: Vicksburg, MS
Posts: 251
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Quote:
Originally Posted by PNISSHR
Ive never seen an LS1/LT1 that recommened 87 |
+1 me either and i dont even have a v8
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 98 firebird v6 A4 ; Dream Bird - work in progress
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September 10th, 2010, 11:49 AM
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#8
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Registered User
Join Date: Nov 2009
Location: Largo, Florida
Posts: 4
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No less than 93 octane ever goes through my 97. It runs like total crap on anything less.
This directly from the 95 owner's manual in regards to fuel for the LT1:
Use premium unleaded gasoline rated at 91 octane or higher
for best performance. You may use middle grade or regular
unleaded gasolines, but your vehicle may not accelerate as
well.
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Tracy - 97 Formula A4
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September 10th, 2010, 07:15 PM
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#9
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4th F-Body Poser
Join Date: May 2010
Location: Iowa
Posts: 100
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Never had a problem running 91 or 93 in any of my 4th gens. You might have a bigger problem there.
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September 11th, 2010, 03:22 PM
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#10
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Moderator
Join Date: Jan 2010
Location: earth
Posts: 135
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^ Yea I've notice no difference between 91 or 93 in my LS1. Used to run 93 when I was back east. But the highest you can get here in CA at the pump is 91. Thanks to the the tree humpers here, CA has to use RFG. It's oxygenated gas that produces less emissions. And best of all it drives up the refining costs so CA has the highest gas prices in the nation, yay. 
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September 13th, 2010, 02:50 PM
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#11
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Registered User
Join Date: Jun 2010
Location: Charlotte, NC
Posts: 4
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The problem turned out to be a faulty coolant temperature sensor.
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September 14th, 2010, 06:50 AM
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#12
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Registered User
Join Date: Nov 2009
Location: Indianapolis
Posts: 48
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I have run one tank and one tank only of high grade through my 3.8. it was pretty good as far as I could feel a torque diff'c, but I also got like 18 mpg on that tank, compared to 23 normally on low grade.
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A.J.
1996 Firebird 3800 Series II, Stock-Ish,T-5 swap  "The Phoenix"
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