5.7 Knock sensor location
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 5.7 Knock sensor location in Past Cadillac Vehicle Discussion; Hello again everybody. I posted about a bad knock sensor a few days ago. Right now, I'm replacing the plugs ...
  1. #1
    Johnny Kaka is offline Cadillac Owners Member
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    5.7 Knock sensor location

    Hello again everybody. I posted about a bad knock sensor a few days ago. Right now, I'm replacing the plugs and cap, since there was some misfiring in the engine, and that may have caused the knock sensor to slow the car down. But Since I bought the sensor and wire anyway, I was going to replace it. My question is, WHERE IS IT? I know on a lot of cars it is under the intake manifold. But on others it's on the side. Some 350's that I have been looking at have them on the side.
    I scoured the factory manual last night. I could not find ANY info on the knock sensor. There was one line in the index that said "Knock" under the "engine" category, but that led to info for a 5.0. Plus, taht page had nothing on knock sensors.
    I'm really confused here. I don't want to start tearing the car up blindly. Is this an easy swap? Or does the manifold have to come off, radiator drained, and so forth? This is a 1990 Brougham with a 350.
    Thanks as always guys!

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  3. #2
    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
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    Re: 5.7 Knock sensor location

    On an LT1 knock sensors also serve as coolant drain plugs. You might want to check out the bottom of engine block as well.

  4. #3
    csbuckn is offline Cadillac Owners Master
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    I believe its on the side of the block near the bottom.

  5. #4
    Johnny Kaka is offline Cadillac Owners Member
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    Re: 5.7 Knock sensor location

    Great, thanks a lot! After reading a bit further, I also wonder if it's the electronic spark control. Some boards have listed that as a solution to code 43. Losing the ESC can cause the same exact symptoms (power loss, check engine light).

    Could that be the case?

  6. #5
    85 FLEETWOOD COUPE's Avatar
    85 FLEETWOOD COUPE is offline Cadillac Owners Fanatic
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    Re: 5.7 Knock sensor location

    Im dealing with the same problem, my onbaard diagnosticis threw the ac controlls pulled a 43 out of the -01 so that means a got to change my knock sensors, i got a 96 and heard i got 2 knock sensors? What year do you have? I think 1s by the starter

  7. #6
    Johnny Kaka is offline Cadillac Owners Member
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    Re: 5.7 Knock sensor location

    I'm dealing with a 1990 Brougham - 5.7 liter chevy 350.

  8. #7
    85 FLEETWOOD COUPE's Avatar
    85 FLEETWOOD COUPE is offline Cadillac Owners Fanatic
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    Re: 5.7 Knock sensor location

    Yea i think you only got 1 and should be right y the starter on the block

  9. #8
    Johnny Kaka is offline Cadillac Owners Member
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    Re: 5.7 Knock sensor location

    Can I ask how you found this out? I was in my manual for a while last night.

  10. #9
    85 FLEETWOOD COUPE's Avatar
    85 FLEETWOOD COUPE is offline Cadillac Owners Fanatic
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    Re: 5.7 Knock sensor location

    Found the knock sensor or the code?

  11. #10
    Johnny Kaka is offline Cadillac Owners Member
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    Re: 5.7 Knock sensor location

    The sensor itself.

  12. #11
    85 FLEETWOOD COUPE's Avatar
    85 FLEETWOOD COUPE is offline Cadillac Owners Fanatic
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    Re: 5.7 Knock sensor location

    I remember seing them but didnt know they was the knock sensor but i googled imaged it

  13. #12
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    jayoldschool is offline GM RWD V8 addict
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    Re: 5.7 Knock sensor location

    To be perfectly honest, I don't know if an L05 (TBI 350) actually HAS a knock sensor...

  14. #13
    Johnny Kaka is offline Cadillac Owners Member
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    Re: 5.7 Knock sensor location

    Thank you Jay, I'm wondering this myself. I cannot find it anywhere. And if it isn't in the factory manual, then.....

    However, I still have the typical power loss, along with a code 43. That could also indicate the electronic spark control module. Same symptoms, I believe. When this happened, it was very wet out, and has been humid for weeks here. to a disgusting degree. It would also explain the strange, intermittent starting problems I've been having.
    Before I go any further, I just want to rule out the knock sensor for certain. How can I find out if this model had a knock sensor?

  15. #14
    turbojimmy's Avatar
    turbojimmy is offline Cadillac Owners Connoisseur
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    Re: 5.7 Knock sensor location

    Quote Originally Posted by jayoldschool View Post
    To be perfectly honest, I don't know if an L05 (TBI 350) actually HAS a knock sensor...
    The F-bodies did, dunno about the Caddies. The sensor was on the right side cylinder head toward the front of the engine. It would be hard to see with the exhaust manifold in the way.

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    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Re: 5.7 Knock sensor location

    I still have my 93 RMW FSM. I'll look it up.

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