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john -aka eauto
john -aka eauto, The Car Guy
Category: Lexus
Satisfied Customers: 15694
Experience:  15 years as a auto tech Ase Certified
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My CEL flashes almost every time upon hard acceleration (rpm

Customer Question

My CEL flashes almost every time upon hard acceleration (rpm over 5k). No hesitation though. Usually goes away, but sometimes CEL stays on with random cylinder mid fire code. Put new oe plugs in, no difference. Any suggestions?
Submitted: 1 year ago.
Category: Lexus
Expert:  john -aka eauto replied 1 year ago.

the coils are likely the failure what codes were retrieved other then po300

Customer: replied 1 year ago.
I had the coils inspected, they were "good". P0300, and bank 1 catalyst failure, but haven't seen that since I replaced the bank 1 02 sensor. Also, this is an 06 is350
Expert:  john -aka eauto replied 1 year ago.

has the cat been checked for restriction? if the cat is partially plugged it wont allow the motor to breath and will cause miss fires

Customer: replied 1 year ago.
I haven't had that checked...is it possible to check flow without removing it?
Expert:  john -aka eauto replied 1 year ago.

yes exhaust back pressure gauge it threads into the upstream o2 hole and the gauge showsif its flowing good or not