Backfiring - Technical Troubleshooting discussion in Forkliftaction's forums

Toyota 8FGCU30:
Backfiring

I have a 2018 toyota 8fgcu30. So we replaced the vaporizer because old one had a hole in diaphragm. It's been a month since we replaced it. It starts and runs smoothly but when you start driving it, it eventually backfires through the air filter. It literally blew apart the secondary air filter. What could be causing this? Any help would be appreciated

Posted 10 Jun 2025 23:35
Discussion started by Vernon_Jackson
Texas, United States

Vernon

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Normally most backfire problems come from some problem with the ingion system l would check the cap roter wires and plugs. check your coil and pick up. Very rarely but possible a intake valve could cause this. would have to be on the intake because you said it blows the air filter cap off. if it were backfiring from the muffler l would say it is a exhaust valve. with that said I myself have never seen that on a late model Toyota.

Posted 14 Jun 2025 22:15
Reply by Scott_
Pennsylvania, United States

Scott

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I saw that happen with faulty ignition wires

Posted 14 Jun 2025 21:14
Reply by Fritzthecat
Connecticut, United States

Be nice to forky

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