dear knock sensor
01-02-2012, 11:44 AM
#1
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dear knock sensor
okie dokie, as i've stated before, my 92 22re 4x4 does not like to run factory 5deg. btdc with regular (87) fuel. it will ping like a sob. my truck is basically stock besides running 31" tires, and have zero codes i am proud to say. the motor has 212000 miles besides the timing chain and all gaskets. the head and piston tops were pretty clean when i had it apart a couple years ago so i dont think compression could be any higher than normal.
so the question arises: could the 160$ knock sensor be bad without throwing a code? as i understand the code will only be thrown if there is an open or short in the knock sensor circuit. but how else could it go bad?
whos got the good ideas? im all out
so the question arises: could the 160$ knock sensor be bad without throwing a code? as i understand the code will only be thrown if there is an open or short in the knock sensor circuit. but how else could it go bad?
whos got the good ideas? im all out
01-02-2012, 06:37 PM
#3
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The distributors can go bad after a few MILLION revolutions. That would be my first guess.
If the knock sensor or pigtail were bad, you'd get a CEL & it would retard timing to ZERO which would make it run like a dead pig.
Have you ever replaced the O2 sensor? they are pretty much toast after 100k miles. Wont' make it ping, but sends fuel mileage into the toilet.
There's a SLIGHT possibility it could be your TPS....
If the knock sensor or pigtail were bad, you'd get a CEL & it would retard timing to ZERO which would make it run like a dead pig.
Have you ever replaced the O2 sensor? they are pretty much toast after 100k miles. Wont' make it ping, but sends fuel mileage into the toilet.
There's a SLIGHT possibility it could be your TPS....
01-02-2012, 09:28 PM
#4
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by distributer going bad, do you mean the pickup coil maybe sending a bad signal and maybe giving wrong rpm to the ecu or something else entirely?
02 sensors (calif) are most likely factory but after seeing the prices. . . . . .well, you know where that goes. i will say that the plugs usually show a bit lean though (thats with rebuilt injectors only a couple years old)
shoot tnr, lean raises combustion chamber temp doesn't it?
tps is only a couple months old and adjusted to spec
back to the o2 sensors. . . . . think that they could give false info causing a lean condition un reported because they are in this hypothetical instance, bad?
02 sensors (calif) are most likely factory but after seeing the prices. . . . . .well, you know where that goes. i will say that the plugs usually show a bit lean though (thats with rebuilt injectors only a couple years old)
shoot tnr, lean raises combustion chamber temp doesn't it?
tps is only a couple months old and adjusted to spec
back to the o2 sensors. . . . . think that they could give false info causing a lean condition un reported because they are in this hypothetical instance, bad?
01-04-2012, 05:18 AM
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by distributor going bad, do you mean the pickup coil maybe sending a bad signal and maybe giving wrong rpm to the ecu or something else entirely?
Either/or. wiring can get crumbly causing missed signals, coils can go bad, etc. I replaced mine with a new OEM Denso this year & saw ALL KINDS of improvements in performance. They are WAY expensive, but you can get a substantial discount from Newnan Toyota (Parts Mgr Gary Smith); I've ordered $1500 worth of parts from him in the past 18 months. At least 30% off for forum members & CHEAP shipping fees; give him a call (no affiliation):
Gary Smith
Parts Manager
Toyota of Newnan
2 Herring Road
Newnan, GA 30265
(678)854-9601
www.toyotaofnewnan.com
email: garys@toyotaofnewnan.com
02 sensors (calif) are most likely factory but after seeing the prices. . . . . .well, you know where that goes. i will say that the plugs usually show a bit lean though (thats with rebuilt injectors only a couple years old)
You can get an OEM Denso or NTK (NGK) replacement for about $70 online. Sparkplugs.com is one place; Gary Smith is another...
shoot tnr, lean raises combustion chamber temp doesn't it? Yep. If I'm not mistaken, you could run either lean OR rich if the O2 sensor isn't functioning correctly.
tps is only a couple months old and adjusted to spec
back to the o2 sensors. . . . . think that they could give false info causing a lean condition un reported because they are in this hypothetical instance, bad?
Either/or. wiring can get crumbly causing missed signals, coils can go bad, etc. I replaced mine with a new OEM Denso this year & saw ALL KINDS of improvements in performance. They are WAY expensive, but you can get a substantial discount from Newnan Toyota (Parts Mgr Gary Smith); I've ordered $1500 worth of parts from him in the past 18 months. At least 30% off for forum members & CHEAP shipping fees; give him a call (no affiliation):
Gary Smith
Parts Manager
Toyota of Newnan
2 Herring Road
Newnan, GA 30265
(678)854-9601
www.toyotaofnewnan.com
email: garys@toyotaofnewnan.com
02 sensors (calif) are most likely factory but after seeing the prices. . . . . .well, you know where that goes. i will say that the plugs usually show a bit lean though (thats with rebuilt injectors only a couple years old)
You can get an OEM Denso or NTK (NGK) replacement for about $70 online. Sparkplugs.com is one place; Gary Smith is another...
shoot tnr, lean raises combustion chamber temp doesn't it? Yep. If I'm not mistaken, you could run either lean OR rich if the O2 sensor isn't functioning correctly.
tps is only a couple months old and adjusted to spec
back to the o2 sensors. . . . . think that they could give false info causing a lean condition un reported because they are in this hypothetical instance, bad?
01-04-2012, 10:40 AM
#6
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An O2 sensor is going to either react slowly to fueling changes [ECU deliberately changes from rich to lean continually] or it's going to read too lean.
Because of how and O2 sensor works, it really can't give a CONTINUAL false rich signal [thereby causing the ECU to lean the engine out too much].
Because of how and O2 sensor works, it really can't give a CONTINUAL false rich signal [thereby causing the ECU to lean the engine out too much].
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01-04-2012, 07:49 PM
#8
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Thread Starter
wow. tnr and alltrac thats awesome info and is very much appreciated.
to outsane, yes, well 91 is whats common in my area. i've been running 91 for a couple months now, at factory timing with no nasty noises. i just had to try it to: a) be sure i know what pinging sounds like. and b) i started thinking that running my 2deg with 87 may upset other paramaters within the efi system.
i just feel rediculous throwing premium fuel into a beat to crap truck. its against my ethics. maybe i should get some high comp. pistons and just run diesel
edit: that last tid-bit was typed scarcasm. aside from strength issues though, i wonder just how possible that may be. . . . . .
to outsane, yes, well 91 is whats common in my area. i've been running 91 for a couple months now, at factory timing with no nasty noises. i just had to try it to: a) be sure i know what pinging sounds like. and b) i started thinking that running my 2deg with 87 may upset other paramaters within the efi system.
i just feel rediculous throwing premium fuel into a beat to crap truck. its against my ethics. maybe i should get some high comp. pistons and just run diesel
edit: that last tid-bit was typed scarcasm. aside from strength issues though, i wonder just how possible that may be. . . . . .
Last edited by 92dlxman; 01-04-2012 at 07:53 PM.
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