Replaced battery and ever since car would turn off when you put on heat. Tried fuel injection cleaners and high octane gas. Was okay for about week and then problem resurfaced but now car is running rough and check engine light on also check engine light flashes when I am excelerating. Please help. Car no longer under warrantyMy battery died and had it replaced, after replacing the battery every time I would turn on the a/c and the car comes to a stop it shuts off. I was able to keep using it for a while then would no longer start. I had the alternator replaced even though it tested good 5 times, from what my understing is that it was the voltage regulator in the alternator. This has seem to help but still can't run the a/c, the rmp's drop and if the car is idle will die. I no loger have a warranty, any suggestions.
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Re: car shutting off
Check your blower resister in duct right in from of motor. These tend to burn out and short every once in a while f its shut off when take you foot off padel to slow down , i recommand you to chechk the throttle body switch my the problem , because when take your foot off throttle body should not close its should open by 10% to allow more , check the chouk as well , does you car have wire padel or electric TB Envoy Shuts off when A/C is turned on: could try this,clean the throttle body bore.here is a bulletin showing you how.Engine Stalls When Air Conditioning Is Turned On at Idle2004-2007 Buick Rainier2002-2007 Chevrolet Trailblazer and Trailblazer EXT Engine may stall with the air-conditioner on and or while adding additional loads to the engine at idle. An example of an addition load would be turning the steering wheel left or right with the air-conditioning on. This type of stall usually occurs during idle or slow parking lot maneuvers. This concern may not set any diagnostic trouble codes. Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM top engine cleaner, GM P/N 1052626 (Canadian P/N 993026) or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product. this should help
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A dirty air filter will prevent adequate air from entering the engine thus reducing gas mileage. Worn spark plugs or a weak spark (defective spark coils) can do the same. A defective "upstream" oxygen sensor (in the exhasut system) can lower fuel mileage. It forces the engine computer to guess at combustion efficiency without feedback from the sensor. It will err on the "rich" side to save the engine, which means it wastes gas. A "check engine" light will be "on" if that is the problem.
In winter, more alcohol is added to gasoline in cold climates to due to the lack of photosynthesis in the region (to make oxygen for us to breath.) Reduced fuel mileage results. Alcohol burns cleaner (and cooler) but it contains less energy (BTU) per gallon than "straight" gasoline. For example, E85 won't take you as far as a tank of regular gasoline.
If your car is designed to use 87 octane fuel, there is no need to use higher octane fuel. Higher octane fuels are for "high performance" engines with increased compression ratios. High octane fuel burns "slower" in the cylinder (to help avoid "detonation") so that the engine can take advantage is its greater compression ratio and advanced igntion timing to make more power. If your Legacy has a turbo, it will likely require the use of premium gasoline to avoid "detonation" under boost. Otherwise, "cheap", 87 octane gas is fine.
Sounds as if you are having fuel injector problems . Try putting in high octane gas and then some fuel Injection cleaner run it for awhile and see if it straightens out some . It could also be a injector pump . It may also need tune up plugs and plug wires new rotor and rotor cap . You may need a tune up badly also check your intake air cleaner ect
First you add octane booster to two year old gas. It is too late for stabil. Find the idle air solenoid and take it out and clean it with throttle body cleaner. Try not to push it in or out. Reinstall and turn on key for I min. and off for 1 min. then start the car.
Try removing all spark plugs and crank the engine for a bit to get everything lubed up and it will give u max compression..Also replace plugs and fire some carb or injection cleaner in some high octane gas........Hope this helps.
Drop the fuel tank down and drain the fuel out of it. Replace the fuel filter. Put high octane gas back in it with Lucas Fuel System Cleaner and it may take a few ignition cycles to finally get the car to start. Start it and let it run or go drive it down the freeway for 20 miles. Replace the fuel filter again. and run a 2nd tank of gas with 92 octane gas.
Even a small amount of bad gas can cause your problem.
So the first thing you need to do is remove your fuel tank so you can drain all of the old fuel out,then remove the fuel sending unit and fuel pump assembly thats in your fuel tank and clean the filter screen, after that you can reinstall the fuel tank,replace your fuel filter and I would have a fuel injector sevice done.
Unless you are very skilled in automotive repair, leave this one to a pro.
Go to AutoZone, borrow the OBDII to check (They will lend it to you for FREE) what the check engine fault code is. Once you have the fault code, you can determine the next steps. Write the fault codes down.and Visit the website =>
to find out what the codes are for quick diagnostic.