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 Post subject: 21* KR today
PostPosted: Wed Oct 13, 2010 5:37 pm 
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Location: Corning, NY
Year and Trim: 2012 Eco
Today while driving I look down when the engine doesn't respond accelerating slowly from a light. I look down, and see 17* of KR on the scanner. I push the gas a little more to give it more gas to combat the KR, and it jumps to 21*. The car's up to maybe 15 mph with my foot most of the way to the floor. Thankfully nobody was behind me as I let off the gas, then stabbed it. A big fat 0 shows in the KR display as the car rockets forward.

I swear, this light-throttle KR is enough to drive a guy to drink, or to buy HP Tuners to mess around with my PCM. Drinking sounds cheaper and easier. :beer: :drunken:

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 Post subject: Re: 21* KR today
PostPosted: Wed Oct 13, 2010 6:35 pm 
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Odd... I wonder if the PCM thought it had real KR or tried to enter Torque Abuse mode for some odd reason


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 Post subject: Re: 21* KR today
PostPosted: Wed Oct 13, 2010 8:24 pm 
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I don't know. It's running great otherwise. Most of the time there's very little KR. But like clockwork, at most light-throttle accelerations, or when I roll onto the throttle at low speed, it gets giant 12-17* KR blips.

I'd love to know what's going on when that happens. It does pull lots of timing like there's real KR.

Don, this is also the PCM that Intense sourced for me back a few years ago from an unknown donor. They took a solid month to get it to me, waiting on the donor, IIRC. I wonder if that has anything to do with it.

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 1:18 am 
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I wouldn't completely rule out a faulty knock sensor. I would think sense false knock under other conditions as well, but it's not entirely impossible for it to be a bad sensor.

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 7:28 am 
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I could buy a faulty knock sensor. Hmm, I bet they're impossible to remove without lots of other engine work.

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 8:08 am 
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Front knock sensor not so bad.... Rear knock sensor sandwiched between the engine and the trans...


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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 1:56 pm 
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Location: Starbuck, MN/Grand Forks, ND
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He would only have one sensor though. I don't know whether its in the front or rear though on a L36.

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 2:33 pm 
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IIRC there are 2 on this engine. My 1999 FSM's say there are 2 also. They're located under the exhaust manifolds in the vicinity of cylinders 3 and 4. Or, the middle of the block.

No extreme knock today. So far. 10* once.

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 2:42 pm 
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Hmm interesting. I thought that was one of the differences between L36 and L67. I guess not! 10* is still a lot for a N/A engine!

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 2:50 pm 
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Pretty sure you're thinking S1 to S2 Tom. I'm pretty sure S1's only have 1 knock sensor.

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 3:07 pm 
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Yea thats probably right.

Either way, the rear sensor could be a pain in the arse.

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 Post subject: Re: 21* KR today
PostPosted: Thu Oct 14, 2010 4:34 pm 
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LeSabre in Buffalo wrote:
IIRC there are 2 on this engine. My 1999 FSM's say there are 2 also. They're located under the exhaust manifolds in the vicinity of cylinders 3 and 4. Or, the middle of the block.

No extreme knock today. So far. 10* once.

All series II engines use 2 knock sensors ;)


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