MY 2004 ENVOY HAS 84600 MILES HAVE DONE OIL CHANGES EVERY 3000 MILES REPLACED TRANS FLUID & FILTER @ 50000MILES HAVE REPLACED FUEL FILTER SEVERAL TIMES IT'S NOT USING ANY OIL BETWEEN OIL CHANGES WHEN AND WHAT SHOULD BE DONE TO TUNE THE ENGINE? RECENTLY STARTED NOT STARTING RIGHT UP AS IT USUALLY DOES. HAVE TO TURN THE KEY OFF AND TRY STARTING AGAIN THEN IT'LL USUALLY START RIGHT UP. THANKS.

Why would you tell us about engine oil & trans fluid changes?

Out with the old oils & in with the new ?

I would lean towards a fuel pump binding up & stopping
fuel,thus the car shuts off

Only one suggestion,could be other causes

REPLACE SPARK PLUGS AND WIRES, REPLACE DISTRIBUTOR CAP AND ROTOR. NEED CHANGE ENGINE OIL AND OIL FILTER.YOU NEED CHANGE TIMING BELT HAS TO BE CHANGED EVERY 60000 MILES TIMING BELT CHANGING TIME OVER DUE.REPLACE WATER PUMP WHEN YOU REPLACE TIMING BELT BECAUSE TIMING COVER HAS TO BE REMOVED WHEN YOU REPLACE WATER PUMP ALSO GET BOTH DONE SAVE TIME AND MONEY.CHANGE TRANSMISSION FLUID AND FILTER.REPLACE FUEL FILTER AND AIR FILTER.FLUSH COOLANT SYSTEM REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP HAVE GARAGE FLUSH OUT BRAKE SYSTEM ADD NEW BRAKE FLUID.INSPECT BRAKES HOSES CHECK FRONT BRAKES PADS AND CHECK INSIDE CALIPER FOR LEAKING SEALS CHECK REAR DRUM BRAKE SHOES CHECK FOR LEAKING WHEEL CYLINDER SEALS.CHECK BALL JOINTS AND STEERING LINKAGE SEALS.CHECK DRIVE BELT OR BELTS.CHECK POWER STEERING FLUID LOOK OLD DIRTY HAVE GARAGE CHANGE POWER STEERING FLUID.ALL THOSE THINGS HAS TO BE CHECK AND DONE IF LAST OWNER NEGLECT DID NOT TAKE CARE OF VECHICLE.ITS GOING TO BE A EXPENSIVE COST. JUST DO A LITTLE AT A TIME.THE TIMING BELT WOULD BE MY WORRY IF IT BREAKS ENGINE IS DONE.I WOULD REPLACE WATER PUMP AND TIMING BELT FIRST WOULD DRIVE MUCH UNTIL THATS FIX.

You Change Transmission Fluid and Power Steering
Fluid every 30,000 miles on ALL Vehicles,never go over
3 years or you will have an expensive rebuilt and never make
100,000 miles on any trans

You remove the trans pan,change filter,clean pan
& magnet and replace pan & refill (Mercon V Fluid)

P/S (Dex-Merc)

Having owned a trans repair shop,your correct,if you change it now,
it will most likely slip.

You need to change trans fluid and flush power steering every 30,000 miles

Your trans is a good one and very luck to get past 110,000, even with fluid changes.

Save up $2000 for a rebuild or a CERT Reman,your over due.

That applies to all your vehicles

Bet you don't change your brake fluid every two years,spark plugs every three years or 60,000,
fuel filter every three years,and on and on

If you change the tranny oil this video will show you how to change the filter.">

Hi,
Technically you are looking more at a 90,00 mile check but here it is regardless - this is what you need to do:90,000mi
Replace: Engine Oil & Filter.
Air Cleaner Filter.
Spark Plugs (Platinum Coated).
Engine Coolant.
Inspect: Automatic Trans axle Fluid.
Brake hoses * Lines.
Brake pads, Calipers, and Rotors.
Exhaust Pipe and Muffler.
Suspension Mounting Bolts.
Steering Gear Box, Linkage & Boots/Lower Arm Ball Joint.
Power steering Pump,
Belt & Hoses.
A/C Refrigerant.
Cabin Air Filter
Drive Belt (water pump, alternator and a/con). Timing Belt.
Manual Trans axle Oil.
Brake Fluid.
Drive shafts and Boots.
Vapor Hose and Fuel Filler Cap. Fuel Lines, Fuel Hoses, and Connections.

Long list there eh?

Hope this helps please rate hi if it does.

oil change every 3000 miles check all fluid levels at 24000 miles change trans.fluid and filter,fuel filter,air filter. at 30000 miles pack front wheel bearings service cooling system,replace spark plugs,inspect wires and pvc valve. lubricate the chassis every 6000 miles. hope this will help!!!

CHANGE SPARKPLUGS/ OIL/ AIRFILTER/ OILFILTER/ CHECK DRIVE BELTS FOR WEAR / CHECK MILEGE USE ON TIMING BELT AND REPLACE BELTS IF WORE.

well its always recommended every 3000 miles to change the oil if you are using mobil1 full synthetic oil then every 5000 miles transmission i recommend every 45000 miles 60000 mile should be radiator fluid,power steering,fuel filter if trans hasnt been done then transmission

Spark plugs at 100,000 (use AC Delco plugs, they work best), check air filter at 15,000 replace at 30,000, replace fuel filter at 30,000, service (fluid and new filter) automatic trans at 60,000, replace hoses and flush cooling system at 100,000 miles, (use long life coolant), check belt at 30,000, replace if any rubber in ribs is missing, cracks are ok per factory bulletin's. oil and filter at least every 5,000 miles, lube chassis every other oil change, more often if u drive short trips, lube the door hinges and hood hinges and all latches every 30,000 miles. If I missed anything you want to know let me know. one last note manual trans and differential change lube only if torn down for repair, otherwise it is lifetime.