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 then started
backfiring on
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


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.

Your Answer:

Lexus ES 300 Experts

  • #1
  • #2
  • #3
View All

Find great deals from top-rated dealersTM


Related Models For Sale

Used Toyota Camry
61 Great Deals out of 1,524 listings starting at $1,550
Used Honda Accord
42 Great Deals out of 1,881 listings starting at $590
Used Lexus GS 300
3 listings starting at $7,281
Used BMW 3 Series
164 Great Deals out of 2,432 listings starting at $2,729
Used Toyota Corolla
133 Great Deals out of 6,836 listings starting at $1,845
Used Mercedes-Benz C-Class
96 Great Deals out of 1,631 listings starting at $3,490
Used Toyota Avalon
3 Great Deals out of 137 listings starting at $3,988

Used Cars For Sale

2003 Lexus ES 300 FWD For Sale
2 listings starting at $5,900
2002 Lexus ES 300 FWD For Sale
1 listings starting at $3,091

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.