Ok so just recently ive been getting a CEL and the car has been hesitating under full boost at ~4k rpm. it also stumbles pretty often when it's just idleing.

the most recent changes ive made are my new 3" exhaust, raised boost to 13psi (for 1 day), gapped my plugs down to .028, and capped my turbo pressure sensor (to get rid of fuel cut and raise the boost.)

now i get this code 52 and pretty bad overall performance...it was running so well, so something i did messed it up.

what spark plugs are you using?

reset the code.
if it comes right back, your knock sensor is dead.

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NGK bkr7e

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try that...


what octain gas are you putting in?

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93...i'll try resetting the code.

This post has been edited by gtfc115: May 25, 2006 - 5:54 AM

just FYI,
if your knock sensor IS blown, the ECU will hold you in "safe" mode, to try and prevent you from blowing the engine.
i would be sure to get that fixed ASAP, its critical to the proper operation of the motor.
then, its time to start trying to find out why it blew... the hesitation you feel is the ecu pulling timing in response to the knock system on the 3sgte.

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what are reasons for a knock sensor going bad...ive read that backfiring and detonation are bad for it. anything else?

i'll probably just get the ATS knock sensor. i know where the sensor is located, i just can see it. is it an easy replacement?

well, there are TONS of reasons it could knock...bad gas, too much boost, detonation, ect ect..
once you get the car up high enough, its just a matter of snaking your arm up there and getting to it.
its not hard at all, just a matter of getting in the right position to get at it.
have you checked your timing with a paper clip or whatever in te1 and e1 ?

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no i havent checked the timing...i'll go buy a timing light in the next couple days. luckily i have my work truck i can drive till i get this fixed. i just wish it was turbo.

Appreciate the help guys. Thanks!

This post has been edited by gtfc115: May 25, 2006 - 1:39 PM

Just ordered the ATS racing GM knock sensor kit. is there anything else i should do when i change the sensor? what if that doesnt fix it? (im sure it will though)

and now that i think about it, i bet i know what did most of the damage. before i got my exhaust done, there was only 1 bolt connecting the cat to the rest of the exhaust and it was blowing hot exhaust gasses almost straight into the area where the sensor is...im sure that wasnt good for it.

This post has been edited by gtfc115: May 27, 2006 - 10:50 AM