05-10-2007, 06:09 PM
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#1 |
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walbro fp
Join Date: Mar 2006
Location: arizona
Posts: 432
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Knock Sensor questions
I have a check engine light, so I did a diagnostic and I got code 52 for knock sensors. One knock sensor (front sens.) was broken so I went to a junk yard and pulled one off another toyota (dont remeber what car). It fit fine, I just had to rewire it. But im still getting code 52, the check engine light is almost always on, even when the car is at idle. Ive also noticed that at full throttle the car dosent pick up after 80-90mph like before, it slows down alittle.
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MK3, Auto, Turbo. |
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05-10-2007, 07:01 PM
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#2 |
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20psi boost
Join Date: May 2006
Location: New Haven/Hamden
Posts: 793
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If you didn't get a knock sensor from a supra, then you are using the wrong one. I don't care if it physically fits or not, it doesn't have the resistance values that a supra knock sensor has.
Go to the dealer and buy a knock sensor for your specific vehicle. |
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05-10-2007, 07:23 PM
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#3 |
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walbro fp
Join Date: Mar 2006
Location: arizona
Posts: 432
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Do you think that the knock sensor has anything to do with my car slowing down after 80mph?
Ill get the knock sensors fixed anyways thanks.
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MK3, Auto, Turbo. |
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05-10-2007, 07:33 PM
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#4 |
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1000whp postwhore
Join Date: Apr 2007
Location: Escape from the Prison Planet
Posts: 1,356
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You may also want to change your' o2 sensor, in the exhaust manifold.
From what I understand, not from experience, The o2 sensor will reak havoc with your throttle response. |
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05-10-2007, 11:43 PM
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#5 |
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Intake
Join Date: Nov 2006
Location: Phoenix, Az.
Posts: 48
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Did you re-set the codes in the ECU after you replaced it the first time?
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05-11-2007, 12:44 AM
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#6 |
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500whp yet?
Join Date: Nov 2005
Location: Mechanicsville, MD, US of A, 20659
Posts: 1,060
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after you fix the problem, you have to reset the ecu to clear codes. to do this pull the 15amp efi fuse in the engine compartment for like 30seconds. if that doesnt clear it than you still have a problem
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88 N/A w/ 5spd - stock - not running, bhg 87 turbo/targa w/ 5spd- fidanza light weight flywheel, new oem slave cylinder, apexi air filter, no ac and no heat |
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05-11-2007, 06:50 AM
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#7 |
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12psi boost
Join Date: Mar 2007
Location: Sacramento, Ca
Posts: 373
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i had a pretty bad o2 sensor and my throttle response still seemed up to par. and when i reset my codes i just took the positive cable off the battery for a few minutes and they have yet to come back... i would advise doing that then testing again every couple hundred miles. good luck
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05-11-2007, 02:17 PM
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#8 |
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Intake
Join Date: Nov 2006
Location: Phoenix, Az.
Posts: 48
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Gotta reset your clock and stereo stations disconnecting the battery. Still works, as does removing the EFI fuse.
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05-11-2007, 03:03 PM
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#9 | |
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1000whp postwhore
Join Date: Apr 2007
Location: Escape from the Prison Planet
Posts: 1,356
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Quote:
Thanks. |
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05-11-2007, 04:38 PM
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#10 |
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walbro fp
Join Date: Mar 2006
Location: arizona
Posts: 432
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Yeah Ive reset the ecu various times. Ive bought two knock sensors already hopefully Ill have them by next week. Thanks guys.
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