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Author Topic: knock on tools  (Read 10282 times)

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Offline ledzeppac

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knock on tools
« on: January 12 2006, 12:40:08 PM »
Has anyone ever experience different knock counts on different scan tools?
I show very little knock on an OTC type scan tool and a good 4.5.6.7... on my scanmaster...

Philly Phil
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Offline 87natty

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knock on tools
« Reply #1 on: January 12 2006, 04:37:21 PM »
Hmm, how's your SM hooked up? Off the ECM or the ALDL link or is it off the knock sensor itself?. There may be a difference. I've asked this before at TBs, and nobody could give a definitive answer.
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Offline ledzeppac

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knock on tools
« Reply #2 on: January 12 2006, 05:05:16 PM »
ALDL....

Top row second one in from left to right....

Morgan's hand held OTC type thing also connects to the ALDL
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Re: knock on tools
« Reply #3 on: January 12 2006, 07:26:16 PM »
My knock guage and SM seem to disagree on general severity.


Silly Syl
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Offline 87natty

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knock on tools
« Reply #4 on: January 12 2006, 09:03:53 PM »
My ANS knock alert and SM flash together. There's nothing to show intensity on the ANS thing.
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Offline ledzeppac

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knock on tools
« Reply #5 on: January 12 2006, 09:06:27 PM »
thanks guys
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Offline Ttype83

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Re: knock on tools
« Reply #6 on: January 12 2006, 10:11:55 PM »
The SM conections need to be soldered not just a quick connect. Check your amps on the Alt to see how much it's putting out (unlike the GF). A weak spark will give you spark knock or to much fuel will give you a rich knock.
 Does the SM show the timing being pulled when it's knocking?
Do you have a logging tool like DS or TL to log a good run with the knock?
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Offline Recklessrob

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Re: knock on tools
« Reply #7 on: January 13 2006, 01:04:48 AM »
My scanmaster reads different than my laptop, or any of my various
scan tools. I thought that was odd too.
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Offline 87natty

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knock on tools
« Reply #8 on: January 13 2006, 01:23:04 AM »
I've always wondered this, as maybe going right off the knock sensor would be a more accurate reading, as the ECU only gets signal every 1.4 seconds or so. As Jim said, it could be a matter of resistance or voltage drop. Who knows?
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Offline Recklessrob

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Re: knock on tools
« Reply #9 on: January 16 2006, 01:20:24 AM »
Everything still reads through the ALDL connector. I personally
think that the scanmaster is programmed a little off. IMO
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Rob

Offline sun dog

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Re: knock on tools
« Reply #10 on: January 16 2006, 01:24:45 AM »
What will happen if you pull the wire off the knock sensor?  Will it take it up to the max deg retard?  Wouldn't hurt to see if you still get knock then.
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Offline Recklessrob

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Re: knock on tools
« Reply #11 on: January 16 2006, 01:48:51 AM »
Quote from: "sun dog @ Mon Jan 16, 2006 1:24 am"
What will happen if you pull the wire off the knock sensor?
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Rob

Offline sun dog

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Re: knock on tools
« Reply #12 on: January 16 2006, 01:52:57 AM »
I was wondering since most of those systems are set up to default to protect the car, when the part goes bad.  Maybe that ESC is bad since he was getting that code 42 before.  If that is bad it might be giving different/variable responses after it heats up.  What about unplugging the ESC?
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Offline ledzeppac

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Re: knock on tools
« Reply #13 on: January 16 2006, 02:16:03 AM »
Quote from: "sun dog @ Sun Jan 15, 2006 10:52 pm"
I was wondering since most of those systems are set up to default to protect the car, when the part goes bad.
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Offline Recklessrob

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Re: knock on tools
« Reply #14 on: January 16 2006, 02:35:12 AM »
I'm not sure whether or not the car will run with the esc unplugged.
Let us know. You may set some codes doing so, but they'll clear
if you unplug the orange wire from the battery for 10 seconds or more.
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Rob
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