1990 toyota 4runner code 52 knock sensor

Asked by Jan 31, 2017 at 07:59 PM about the 1990 Toyota 4Runner 4 Dr SR5 V6 4WD SUV

Question type: Maintenance & Repair

Code 52 knock sensor boggy feeling mechanic
said it sounds like my motor is running off of 5
cylinders i ordered a new knock sensor. Any one
who can shed light on this will be appreciated.

1 Answer

71,805

The knock sensor is like a microphone that listens for spark/knock. When it hears pinging or knocking it sends a signal to the computer (ECM). The ECM then electronically retards the ignition timing to stop the pinging or knocking. If the knock sensor is malfunctioning it could be making the ECM severely retard the ignition timing. This will cause loss of power, the engine will run hot and possibly boil over when you shut it off. It can also cause late transmission shifting if it's an automatic with a vacuum modular. One other thing to be aware of on this subject is if your engine has developed a valve tap the knock sensor may hear it and severely retard the ignition timing unnecessarily. This happened to me on my '93 Chevy Caprice when it was near the end of it's life. I had to disconnect the knock sensor wire at the knock sensor module for it to run right those last few months I had it. HTH. -Jim

Your Answer

Toyota 4Runner Experts

  • #1
    Kurt Burton
    Reputation
    1,240
  • #2
    azurro
    Reputation
    740
  • #3
    kbro
    Reputation
    640
View All

Related Models For Sale

Used Toyota Land Cruiser
2 listings starting at $66,900
Used Ford F-150
659 Great Deals out of 13,638 listings starting at $3,000
Used Ford Explorer
49 Great Deals out of 1,688 listings starting at $3,985
Used Nissan Pathfinder
19 Great Deals out of 1,043 listings starting at $1,900
Used Toyota Camry
108 Great Deals out of 2,544 listings starting at $2,000
Used Jeep Wrangler
108 Great Deals out of 2,159 listings starting at $3,990

Used Cars For Sale

2017 Toyota 4Runner For Sale
57 listings starting at $39,995
2016 Toyota 4Runner For Sale
88 listings starting at $36,999
2015 Toyota 4Runner For Sale
69 listings starting at $33,999
2014 Toyota 4Runner For Sale
23 listings starting at $28,900
2013 Toyota 4Runner For Sale
36 listings starting at $21,888

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.