I have a 96 toyota corolla 1.6 5spd that is hesitating upon acceleration. When i start it and its cold it accelerates fine but as soon as the temperature needle starts rising then the problem starts. It idles pretty good but sometimes randomly stalls, it also stalls when im at highway speeds and i let off. I replaced the cap,rotor,fuel filter,coolent temp sensor,o2 sensor,fuel pressure regulator, fuel pressure looks normal,injectors are good, checked timing, cleaned egr ports, checked for vacuum leaks and still no luck. The only diagnostic codes that it has shown are po125, and po401(which is why i cleaned egr). Im a student mechanic but im about to give up on this one Please Help. Thanks.
1) Defective electric assist on choke 1) Replace it.
2) Defective accelerator pump (low output). 2) Replace it.
3) Float level setting very low. 3) Adjust to factory specs.
4) Bad ignition condenser. 4) Replace it.
5) Plugged heat crossever system in manifold. 5) Inspect and clean passages in the intake manifold and heads. Test heat riser valve, replace if defective.
6) Defective source of hot air up to the carburetor. 6) Check and replace as necessary: heat shroud duct, temperature sensor, vacuum door moter, manifold vacuum supply.
7) Defective thermal switch. 7) Check all thermal switches, especially those connected with the distributor, EGR, & vacuum motors in the air cleaner housing.
Hope this helps:}
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