Backfire on acceleration

Asked by Jul 31, 2019 at 11:35 PM about the 1999 Lexus ES 300 FWD

Question type: Maintenance & Repair

Ladies car had lose ground.had it
jumped but cc left ground
lose.drove to me.tightened
ground.battery was dead & would
not charge with
charger.replaced.car then started
backfiring on acceleration.no
codes 50 psi fuel pressure.air
filter severely restricted replaced
& ran fine overnight.started
backfire on acceleration again.still
no codes but never seen sensors
respond so slow to Snap On
Modis scanner.suspect blown
ECMfrom voltage spikes.What do
you think?

1 Answer

69,375

Sputtering has its roots in poor spark or fuel delivery. Could be failing spark plugs, coils, wires, or electrical supply to these. Could be dirty fuel injectors, faulty fuel pump & clogged fuel filter, dirty MAF, faulty Oxygen sensor, or even a vacuum leak. Backfires can be caused by these, as well, but could also be an ignition timing issue. One of the results of these is a clogged catalytic converter that just makes the problems worse. Correction is fairly simple: Do a rigorous tune-up, and see if the converters need to be replaced.

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