Explain P0325- Knock Sensor Diagnostics?
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Trailering
Joined: Jul 2016
Posts: 15
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Explain P0325- Knock Sensor Diagnostics?
2004, 4.6L Triton, 220k miles.
Audible heavy "ticking" which seems to be coming from top end. Engine light is not on, but getting P0325 (knock sensor) and P1000 (needs more driving) when I connect the scanner.
I'm not clear on whether a "bad" knock sensor can cause ticking/knocking if defective by retarding timing, etc. if it thinks there's a problem (where there isn't one due to a bad sensor), or is it most likely telling me I do have an internal problem with engine components causing the noise? I had previously lean condition codes both banks after replacing the alternator, but found a disconnected vacuum hose- but oddly wasn't getting the knock code at that time despite the noise.
Idles smoothly, accelerates fine without hesitation though I've babied it on the short test drives since this problem manifested.
What would you do?
Audible heavy "ticking" which seems to be coming from top end. Engine light is not on, but getting P0325 (knock sensor) and P1000 (needs more driving) when I connect the scanner.
I'm not clear on whether a "bad" knock sensor can cause ticking/knocking if defective by retarding timing, etc. if it thinks there's a problem (where there isn't one due to a bad sensor), or is it most likely telling me I do have an internal problem with engine components causing the noise? I had previously lean condition codes both banks after replacing the alternator, but found a disconnected vacuum hose- but oddly wasn't getting the knock code at that time despite the noise.
Idles smoothly, accelerates fine without hesitation though I've babied it on the short test drives since this problem manifested.
What would you do?
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Trailering
Joined: Jul 2016
Posts: 15
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Just changed the oil...(made sure it was full, 6-1/2 qts) including some Lucas Oil Stabilizer to see if might quiet it down- it didn't.
Before that, ran Liqui Moly engine flush through the engine. I've been thinking I've got a collapsed lifter, was hoping if the lifter oil passage was clogged that might free it up.
You're saying a faulty knock sensor can actually cause the knock/tap I'm hearing?
Before that, ran Liqui Moly engine flush through the engine. I've been thinking I've got a collapsed lifter, was hoping if the lifter oil passage was clogged that might free it up.
You're saying a faulty knock sensor can actually cause the knock/tap I'm hearing?
More Turbo
Joined: Sep 2017
Posts: 574
Likes: 146
A faulty knock sensor can cause unusual noises...it's worth testing.
https://themotorguy.com/knock-sensor...d-how-to-test/
https://themotorguy.com/knock-sensor...d-how-to-test/
Hotshot
Joined: Jul 2020
Posts: 10,572
Likes: 2,678
From: Near Salt Lake City
Monitor the PIDS KN1V and KN2V (if you can read the pid voltage the wiring is good)
Do the actual Ford pinpoint tests for that code (in the PCED)
Could be a simple wiring problem or a faulty sensor
You replace the sensor and still have the light, where are you then? Back to the pinpoint tests
Might as well do them now
Most generic aftermarket scanners will not read that particular pid
Good luck
My NGS (Ford new generation star) will read that pid and all the others. You may need to jump through the fortran hoops
Possibly a new model Autel scan tool will do it, or one of the expensive Snap-on scanners
Do the actual Ford pinpoint tests for that code (in the PCED)
Could be a simple wiring problem or a faulty sensor
You replace the sensor and still have the light, where are you then? Back to the pinpoint tests
Might as well do them now
Most generic aftermarket scanners will not read that particular pid
Good luck
My NGS (Ford new generation star) will read that pid and all the others. You may need to jump through the fortran hoops
Possibly a new model Autel scan tool will do it, or one of the expensive Snap-on scanners
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Trailering
Joined: Jul 2016
Posts: 15
Likes: 0
^^^
Thanks. Taking to the shop today for diagnostics, they know the various "noises" much better than I and have the experience and scanner to do it correctly so I don't spend days (or weeks) and a lot of unnecessary $$ chasing it down.
Thanks. Taking to the shop today for diagnostics, they know the various "noises" much better than I and have the experience and scanner to do it correctly so I don't spend days (or weeks) and a lot of unnecessary $$ chasing it down.
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90f150moneypit
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