DishMan Posted February 9, 2009 Share Posted February 9, 2009 Hi All, I found some similar threads about check engine light and knock sensors, but they seemed to be concerned with faulty sensors rather than an actual knock problem. My situation is that I had the engine replaced recently on a 2001 Outback A/T (engine is rebuilt with 7/70 warranty). Shortly after it was replaced, the CEL started coming on intermittently. It seems random when it comes on and it can stay on for a whole triip (us 1/2 hr in town), or just several minutes. We also think that it is not running as smoothly as it should, though it is not terribel. We took it back to the shop (not a Subaru one since there are none in the area) and they read the code and found it was engine knock. They reset it and said to come back if it came on again. It did, with the same code, but the light went off. They seem to be at a loss as to what to do. What should I have them check? They do not have an exhaust gas analyzer, but I was under the impression that that was required for setting up engines these days. Any suggestions most welcome...:-\ Link to comment Share on other sites More sharing options...
vwbuge1 Posted February 9, 2009 Share Posted February 9, 2009 Was it the knock sensor that tripped the light? Link to comment Share on other sites More sharing options...
idosubaru Posted February 9, 2009 Share Posted February 9, 2009 What makes you think you have "an actual knock problem"? It's probably the sensor. Replace the knock sensor. If it was already replaced then make sure it's installed properly. Remove it, check the connector, clean the threads, mating surface on the block, and clean the sensor. Also, there's a very specific installation procedure. It is supposed to be installed only one way and at a specific torque. All of this is covered in other threads on USMB, print those threads out (they have pic's too) and give to your mechanic. Link to comment Share on other sites More sharing options...
abog Posted February 9, 2009 Share Posted February 9, 2009 While working as a tech in Subaru dealerships, I installed a large number of factory short block engines. EJ22 and EJ25 short blocks came with new knock sensors already installed. The point is, knock sensors and O2 sensors, IMHO are maintenance items and should be replaced at regular mileage intervals of 80 to 100 thousand miles. And definitely any time an engine is replaced. Link to comment Share on other sites More sharing options...
nipper Posted February 9, 2009 Share Posted February 9, 2009 Replace the knock sensor. nipper Link to comment Share on other sites More sharing options...
DishMan Posted February 17, 2009 Author Share Posted February 17, 2009 Thanks everyone for the replies. I thought that the mechanic meant that the sensor was indicating that the engine was knocking. Looking into it further, it seems that there is only one knock sensor code, so everyone's advice to replace the sensor seems reasonable. The CEL has been off for a while but it is maybe still prudent to replace it anyway. Does anyone have any opinion about whether a $50 sensor would be any worse in terms of performance or reliability than a $90 one? Link to comment Share on other sites More sharing options...
nipper Posted February 17, 2009 Share Posted February 17, 2009 Thanks everyone for the replies. I thought that the mechanic meant that the sensor was indicating that the engine was knocking. Looking into it further, it seems that there is only one knock sensor code, so everyone's advice to replace the sensor seems reasonable. The CEL has been off for a while but it is maybe still prudent to replace it anyway. Does anyone have any opinion about whether a $50 sensor would be any worse in terms of performance or reliability than a $90 one? They are basically really simple devices. they are just a little peice of quartz that makes an AC signal that the ECU processes. I have yet to hear of this having to be an OE part. Check www.1stsuabru.com website just to see what sooby gets for one. Otherwise I dont think it matters. nipper Link to comment Share on other sites More sharing options...
crash321 Posted February 17, 2009 Share Posted February 17, 2009 Probably should stick with an OEM sensor. Link to comment Share on other sites More sharing options...
DishMan Posted February 17, 2009 Author Share Posted February 17, 2009 www.rockauto.com claim that the OEM part is: "OE Part # 22060AA070A {Knock Sensor #22060AA070}", and their price for that is only $42.89! Link to comment Share on other sites More sharing options...
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