99 Lexus ES300 issues

Asked by Feb 22, 2018 at 06:14 PM about the Lexus ES 300

Question type: Maintenance & Repair

After a tune up, R&R spark plugs, air filter, cleaned MAP sensor, coolant
hose fix, PCV valve cleaned...everything went extremely well. While getting a
very smooth running engine up to operating temp to check for any leaks (ran
AC on full, then heater to make sure coolant levels were full and engine at
normal temp) the engine went from smooth idle to surging slightly RPM up
and down and running a bit rough. Check engine Light flashed so checked
codes and found random misfire and a code for cylinders 2, 4 & 6. (front
bank) Checked all vacuum connections, electrical & anything else I might
Have disturbed during the tune up. I'm guessing there is something now
going on that is affecting only the front cylinder bank but I'm not sure where
to look as the back bank (1,3,& 5) seem to be fine (no codes anyway!) Any
incite on what to run down first as I feel there has been a change in fuel mix
due to a vacuum leak maybe to the front bank? Appreciate any response or
suggestions on where to proceed next!  

2 Answers

293,605

Recheck all your connections. Also check the connection to the MAF and clean it the sensor itself with MAF CRC cleaner, follow the instructions on the can.

105

When all else fails....there are 4 grounding points on that Year/Model Lexus. I chased similar situations for over 2 years and put lots of parts into the car. I was a DIY. Finally found a good/great mechanic that cleaned the 4 ground wire Points...You can probably Google those points...I don't have a clue.

Your Answer:

Lexus ES 300 Experts

  • #1
    Tom Demyan
    Reputation
    1,620
  • #2
    AndyESLexus
    Reputation
    860
  • #3
    rockajean
    Reputation
    520
View All

Related Models For Sale

Used Lexus ES 350
11 Great Deals out of 171 listings starting at $6,988
Used Lexus ES 330
10 listings starting at $4,995
Used Toyota Camry
33 Great Deals out of 2,127 listings starting at $2,445
Used Lexus GS 300
2 listings starting at $6,995
Used Lexus ES 300h
26 listings starting at $23,892
Used Honda Accord
27 Great Deals out of 1,605 listings starting at $1,995
Used Lexus GS 350
3 Great Deals out of 47 listings starting at $12,495
Used Lexus IS 300
80 listings starting at $5,995
Used Honda Civic
94 Great Deals out of 5,096 listings starting at $2,395
Used Lexus IS 250
6 Great Deals out of 216 listings starting at $4,492
Used Lexus RX 350
29 Great Deals out of 558 listings starting at $6,995
Used Lexus IS 350
5 Great Deals out of 86 listings starting at $6,450
Used Toyota Corolla
110 Great Deals out of 4,201 listings starting at $2,100
Used Lexus RX 300
5 listings starting at $4,900

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.