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Ask Ted Ritter Your Own Question
Ted Ritter
Ted Ritter, Toyota Master Tech
Category: Toyota
Satisfied Customers: 4409
Experience:  Toyota Master Tech, ASE Certified
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I 2001 Toyota Corolla I had misfires on all four cylinders

Customer Question

I 2001 Toyota Corolla I had misfires on all four cylinders I change spark plugs and coil pack still have random tiny misfires until I step on the gas and they all go away I also have the eve app code P0441
Submitted: 1 year ago.
Category: Toyota
Expert:  chevygeorge replied 1 year ago.
It sounds like you have a vacuum leak causing your random misfires. It would also explain your evap code p0441. When you step on the gas you are overcoming the vacuum leak. I would recommend you inspect your vacuum pipes and hoses for leaks. Pay special attention to what your might have disturbed in your previous repairs. Pay special attention to the intake manifold area. Soapy water in a spray bottle may help you locate a leak. You may have fixed your initial issue and caused another smaller issue. It may also be necessary to have the system tested with a smoke machine tester to find the leak.
Customer: replied 1 year ago.
Before I started I had the misfire and evaporate code
Customer: replied 1 year ago.
What's the best way to smoke this through evaporate outlet or another way
Expert:  chevygeorge replied 1 year ago.
Yes. This should be done through the test port with a dedicated evap tester with flow rate measurement.
Customer: replied 1 year ago.
What is a normal flow rate
Expert:  chevygeorge replied 1 year ago.
P0441 is a evaporative leak a component found in the area of dotted lines. You need a scanner to close the purge and vent solenoids and pressurize the system to look for pressure loss. if it fails, then you use smoke to locate visually.
Expert:  chevygeorge replied 1 year ago.
I'm going to put your question back out there so other pros might respond. Thanks, George
Expert:  Ted Ritter replied 1 year ago.
Hello, try replacing the evap purge vsv under the hood, it is attached to the hose with the green cap on it, these are known to intemittently leak causing extra air to get into the intake simulating a vacuum leak, I believe in that illustration it is called the vsv for evap, give that a try.