88 Toyota Corolla backfires through carburetor.

Could be leaking inlet valves or a timing issue with either the valves or ignition.

Did you try to adjust the choke in the carburetor? Also, check to see if there's a vacuum leak. This may solve the problem.

Sounds like an intake manifold leak. Once the manifold gets hot the gasket leaks. I would check that first and the head gasket second. Are you getting any smoke, hesitation at all?

Hi and welcome to FixYa!

Does your corolla still runs on carburetor? If it is then it's a common problem. The carburetor's jet spits too much fuel when worn out. I strongly suggest that you get a carburetor kit and replace the jet and seals to resolve the problem.

Fuel consumption will surely be good after the procedure.

Hope this helps and thank you for using FixYa! Have a good one!

Hi,

You could find the fuel filter mounted on the fire wall.

Just follow the fuel line/hose from your carburetor and it will lead to the fuel filter itself.

Hope that hels out!

Thanks for using Fixya!

THis is normally done with a pressure gauge on the fuel rail. Do you suspect a fuel delivery problem? Take off the air filter and spray a little carb cleaner in the intake manifold and crank. If it tries to start you are going in the right direction possibly fuel pump. Use extreme caution not to spreay too much. If the car backfires you may see a backflash flame!

Quick explanation of your fuel system:

An automotive fuel system consists of everything between the fuel tank and the carburetor or fuel injection unit. This includes the tank itself, all the lines, one or more fuel filters, a fuel pump (mechanical, electric, or both), and the carburetor or fuel injection unit.
With the exception of the carburetor or fuel injection unit, the fuel system is quite simple in operation. Fuel is drawn or pumped from the tank through the fuel line by the fuel pump, which forces it through the fuel filter, and from there to the carburetor/injection unit where it is distributed to the cylinders.

So with that info...try first to clean your spark plugs.
Next, replace your fuel filter.
After that, depending on a carburetor/fuel injection, try an additive that cleans the injectors. For the carburetor, try a half of can of what is called "Seafoam". It comes in a metal can available everywhere, including Walmart. It is worth the $6-8 and also will "dry" out your fuel from water. Very good product.

After that, get back to us and let us know how your Toyota is running.

If it starts fine when warm but not when cold it sounds like the choke is not coming on , Get who ever repaired the carb to fix the problem as they have not done what you paid them for.
hope this helps

Some possibilities:
--the choke cable or the choke linkage on the carburetor is sticking, holding the revs too high.
--the gas pedal linkage, the pedal cable, or its linkage to the carburetor are sticking.
--the engine computer (if it has one) is failing, or has poor connections, or isn't grounded properly.
--various other sensors (if you have them) could be failing.
--the mechanism (computerized or mechanical) calling for more fuel to the carburetor when the air conditioning (if you have it) is turned on could be sticking or not working properly.
You should be able to test most of these possibilities while the car is standing still, with the engine running. Start with the choke -- have a helper move the knob and see if the engine responds properly, especially in the "off" position. Then have the helper operate the gas pedal while you watch what's going on with the carburetor.
Have your helper turn the a/c on and off. If you see a mechanical linkage to the carburetor move when the a/c is turned on, it should move back to its original position when it's turned off.
If any of these linkages (including the gas pedal linkage under the dash) are sticking, try spraying the affected area with a lubricant (like WD-40). If that doesn't help, spray lubricant into the cables, or replace them.
If all else fails, carefully check all vacuum lines in the engine compartment. An intermittent leak (or blockage) could be affecting engine speed.

i would say try replacing the pcv valve and fuel filters if new carbs do the same thing iwould say cut your losses