My 1.8 dohc engine burns alot of gas, exhaust smells gasy, and engine backfires often

You need a carburator adjustment. I'm guessing it is a 302cid? It's burning too lean

Hi

Are you sure the exhaust system is good?

Thanks!

Gas Smell from Exhaust Sometimes you may find that the exhaust smells like gas. This is normally a problem with the air and fuel mixture as your fuel injector may be sending too much gas through the engine and not all is burning. This can easily be fixed by having your engine properly tuned. You also may not be using the correct brand of gasoline. Therefore the engine and exhaust are not working properly which results in gas like odors emerging. You may also find that the fuel injector is clogged and needs cleaning. Another cause of this gas smell is a stuck choke if you have a carburetor.

vechicle could be burning oil.or look under hood for valve cover gasket leaks. oil leaking on hot engine and exhaust manifold will cause burn smell.check drive belt could be slipping.make sure brakes not dragging or if you replace brakes pads you will smell burn smell until new brake shoes or pads break in.

is there a leak in your fuel line, or possibly your fuel filter, if you see raw gas leaking, then it is dangerous for you tio continue to drive it, it only takes one spark to ignite it, however, if the smell is just your car burning rich and the exhaust has holes in it, it will smell up the inside of your car. And yes if your carb. is burning too rich then it needs adjusted. Wasting your fuel, and overloading your engine. I hope some of this was helpfull.

Hello, You may benefit from a FREE scan of your car at Autozone, Advance, or Oreily autoparts stores. If your problem started after getting some gasoline, this does sound alot like bad gas.

The self Diagnostic computer in your car should make the "Check Engine" light activate if it is a Mechanical defect. There is a part called a "Throttle Position Sensor" which sets the timing and fuel flow for the conditions the engine needs to run at. These settings change almost instantaneously and a failing part could make it work intermittently.

The balance of the Engine Management System would generate a traceable Code. If the exhaust smells like Sulfur, there is usually too mush gas. A sweet exhaust smell indicates an Internal Antifreeze leak into the engine head, and your Antifreeze level will draw down. Stale gas has a Metallic smell like steel melting in a Foundry oven.

If the Diagnostic tests do not confirm anything, then try getting a fuel sample done and have the Fuel filter changed at the same time. There is pressure in the system and you may need to bleed off the pressure before the Fuel filter will come off. This can be a messy job. There are also tools specially made to decouple the filter.

That is about all I can recommend at this time.

Blue smoke is oil and means you have internal engine damage.
White smoke with a sweet smell means you have a blown head gasket (check antifreeze, if it's low that is another sign)
White smoke with no real smell is water in the gas tank. Grab some water remover.
Black smoke is a sign your burning to much gas, you need a tune up.

It sounds like you may have a clogged-up catalytic converter. Try cracking the exhaust loose at the flange in front of the engine where the Catalytic converter bolts to the exhaust manifold. You don't have to take it all the way down, just 1/2" or so. You may have to take the bolt loose on the bracket where the pipe mounts to the oil pan to get the cat to drop down. After you get it down a ways, start it up and see if it runs better. (It will be very loud) If it idles and accelerates without dying or backfiring, then your cat is clogged up.

SMELL GAS YOU NEED CHECK ALL FUEL LINES UNDER THE HOOD IN THE ENGINE COMPARTMENT.IF GAS IS STRONG UNDER HOOD YOU DONT SEE LEAKING FUEL LINES.YOUR FUEL RAIL FUEL INJECTORS LEAKING OR FUEL PRESSURE REGULATOR O - RING OR DIAPHRAM LEAKING GAS.IF FIND NO LEAKS UNDER THE HOOD CHECK FUEL LINES UNDER CAR FROM ENGINE TO FUEL TANK FOR LEAKS.IF ALL IS GOOD YOUR EVAPORATIVE CANISTER SOAKED WITH GAS OR YOUR EMISSION EVAPORATIVE SYSTEM NOT WORKING. DEALERSHIP HAS TO CHECK AND FIX.

White smoke is what color exhaust is when your burning antifreeze.The antifreeze is making the plugs wet and hard to start.You need to have your car checked for a head gasket.