Hey guys im new to this forum, i just recently picked up a 1996 Bonneville SSEI with just over a 100 000 miles on it. It is my secondary vehicle and make trips of about 1200 km a week. I like the performance of the car and can do lots of work myself but i am also looking to get good mpg. I have a cone filter on the car already, what else is available to increase mpg and performance? also this car was owned by an elderly couple and is in great shape. I am looking at also giving it a complete tune up. I have changed the oil/filter, fuel filter, plugs, new cone filter, what else can i do for a complete tune up? egr clean?? Any advice to help performance and mpg in this car would be greatly appreciated! thanks in advance!

1987-2005 Bonneville / Buick 3800 Maintenance List

Run Seafoam through gasoline and intake every 5,000 miles. One pint of Seafoam in a half tank of fuel is a good mix. The intake is optional, but recommended.

Grease: Ball Joints, Tie Rods Every 8-10k ( Green Grease recommended)
Air Filter Every 15k (Amsoil EaA, Purolator PureONE)
PCV Valve Every 30k
MAF Sensor Element Cleaning/TB Cleaning Every 50k viewtopic.php?f=48&t=1661
Fuel Filter Every 15-25k (Purolator, AC Delco, WIX)
Spark Plugs Every 30-50k (NGK TR55 or Autolite 605) (Never Bosch)
Ignition Wires Every 30-50k (Napa Belden, AC Delco, Autolite Pro, NGK) (Never Taylor or Bosch)
Oil & Filter Every 5-6k or Every 6 months (Mobil1 or Amsoil)(Mobil1, Purolator PureONE, Amsoil EaO or WIX) (Never Fram) viewtopic.php?f=45&t=214
*Conventional Oil Every 3k/3 months(Pennzoil with a WIX (Napa), Delco or Purolator filter)
Transmission Flush or Pan Drop Every 15-20k (Always make sure filter is changed when flushed) http://www.pontiacbonnevilleclub.com/fo ... 45&t=10193
Cooling System Flush Every 25-50k or 3-5 Years (Peak or Prestone Green Coolant Only) (Never Dexcool)
Oxygen Sensor Every 80-100k (30k for non-heated) (AC Delco or Denso) (Absolutely never Bosch) viewtopic.php?f=48&t=794
Accessory Belt Inspect every 15k, replace every 100k, or as needed
Cabin Air Filter Inspect and Replace every 15k, or as needed in dusty conditions. (Note: 00+ Only)
Evap Core Cleaning Whenever Needed (Note: 99 and older only) viewtopic.php?f=45&t=2432

*Special Considerations*
All 3800s, LG3, LN3, L27, L36, L26, L67 & L32, especially important on vehicles factory installed with orange Havoline Dexcool Antifreeze/Coolant: http://www.dex-cool.net/
Lower Intake Manifold Gasket Replacement, every 80-100k (ignorance of this can allow coolant to enter your engine oil, this happening can cause irreversible lower engine damage, requiring replacement of subject engine)

Series II, Naturally Aspirated, RPO:L36:
Upper Intake Manifold Plenum Replacement, Every 80-100k (ignorance of this can allow coolant to enter your intake manifold, possible damage to occur can be hydrolock, irreversible damage to emissions devices, misfires, etc. Most times, engine replacement is required if ignored long enough.) viewtopic.php?f=53&t=1061

Series I, II, III RPO Code L67 & L32:
Change Supercharger Oil; Every 30-50k. (Intense Racing or GM Dealer) viewtopic.php?f=56&t=1690
Supercharger Belt; Inspect Every 15k, Replace Every 100k or as needed.

10/26/2010 by 00Beast

_________________
Bye Bye:

RIP sandrock

Your cone filter may actually be hurting you, depending on how you installed it. Let's see your setup for starters, then we'll take a look at your other options.

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Why never bosch? i just purchased bosch platinum plus but havent installed them yet? the cone filter it set up on the end of the short intake tube from the stock airbox. since installed i have noticed an increase of performance and the mileage seems to have improved with regular driving

Platinum plugs are the absolute worst to run on a supercharged app. They will act like a glow plug and can cause damage. Use copper plugs.

What brand of filter is it? With that setup you want to either make a box around it to seal it from engine air, or extend it so the filter is located outside of the engine bay. If not, you're pulling in hotter air than the stock box, and gonna hurt performance.

_________________
Bye Bye:

RIP sandrock