What the KR? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-02-2007, 08:28 PM   #1
Senior Member
Posts like a Corvette
Thread Starter
 
Join Date: Jul 2004
Location: Winnipeg, Manitoba, Canada
Posts: 1,445
Thanks: 0
Thanked 0 Times in 0 Posts
captainmiller is on a distinguished road
Default What the KR?

Today I just randomly had my Aeroforce on KR. Expecting to see nothing I was suprised when I did.

NO boost related mods. -7C out.

This is what happens.

Cruising @ 70kmh.
Put it to the floor.
Downshift, and spike to about 3 degrees, almost simultaneously.
RPM'* climb, KR starts falling until it reaches 0 and stays there.

Is this normal?

I am running 91 octane. The only mods the car has should help reduce it. My broken converter just got replaced with a magnaflow hi-flow. I have a RX-4750 and rice pipe, no heatshield yet.

This isn't looking good especially since I planned on dropping to a 3.4 this summer, with a PCM, P-Log, and a good heat shield on the intake.

(Posted it here because I wasn't doing any modding)
captainmiller is offline   Reply With Quote
Old 03-02-2007, 09:09 PM   #2
Junior Member
 
Join Date: Mar 2004
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
harofreak00 is on a distinguished road
Default

3* of KR around shifts is completely normal
harofreak00 is offline   Reply With Quote
Old 03-03-2007, 08:39 AM   #3
Junior Member
 
Join Date: May 2006
Location: BonnevilleHell
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
clm2112 is on a distinguished road
Default Re: What the KR?

Quote:
Originally Posted by captainmiller
<snip...>Cruising @ 70kmh.Put it to the floor.Downshift, and spike to about 3 degrees, almost simultaneously.RPM'* climb, KR starts falling until it reaches 0 and stays there. Is this normal?<snip...>
That'* normal. The quick spike to 3 degrees KR when the throttle snapped open is the engine going lean with a lot of advance when it starts to accelerate (with TCC and top gear). As the mixture caught up with the engine and went rich the knock went away and the KR went back to zero. The TCC unlocking and dropping out of 4th lightened the load on the motor as well. You can look at your TPS voltages (perhaps adjust the TPS on the throttle body a little higher)

How did your O2 values look while under WOT?
clm2112 is offline   Reply With Quote
Old 03-03-2007, 09:06 AM   #4
Junior Member
 
Join Date: May 2006
Location: BonnevilleHell
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
clm2112 is on a distinguished road
Default Re: What the KR?

BTW, the reason I am suggesting a look at your TPS values goes like this:

The only sensor that tells the ECM what you want to do is the TPS, by virtue of it being both a quick acting sensor and it'* strapped directly to the throttle...it sees your request to change engine speed as the throttle blade is moving. That'* even quicker than reading the vac signal behind the TB.

If this makes any sense: The TPS, MAF, MAT, and IAT are all sensors that cause gross changes to happen, they are looking at the current operating temp, the temp of the air getting sucked in, the density of the air getting sucked in, and what you want the motor to do.

The rest of the sensors tell the ECM what happened after the fact. Knock, RPM, VSS, and O2. The O2 is the slowest of the sensors to respond and is far enough downstream to be only used as a cross-check. (in other words, the O2 sensor cannot be used to compute fuel delivery in real time...by the time the exhaust gas hits it it'* too late. So it'* only an average "how are we doin' ? " sensor.

Does that make sense?
clm2112 is offline   Reply With Quote
Old 03-03-2007, 04:12 PM   #5
Senior Member
Posts like a Corvette
Thread Starter
 
Join Date: Jul 2004
Location: Winnipeg, Manitoba, Canada
Posts: 1,445
Thanks: 0
Thanked 0 Times in 0 Posts
captainmiller is on a distinguished road
Default

That makes perfect sense, thanks. I was under the impression any KR while unmodded (especially in cold temps) was bad, but it makes sense after that explaination. I havn't watched O2 under WOT, but I could. Should be very accurate to, as the sensor is brand new.
captainmiller is offline   Reply With Quote
Old 03-04-2007, 02:07 AM   #6
Junior Member
Posts like a Ricer Type-R
 
Join Date: Oct 2006
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Thunderz24 is on a distinguished road
Default

I don't know what KR means. Came someone help me out?
Thunderz24 is offline   Reply With Quote
Old 03-04-2007, 02:15 AM   #7
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Grand Rapids, Mi
Posts: 5,656
Thanks: 0
Thanked 0 Times in 0 Posts
Archon is on a distinguished road
Default

Knock Retard. The computer starts to pull timing when the knock sensor detect a knock or ping. It helps to protect the engine from damage.

Edit - Doing a search on KR or knock retard will give you many threads that will explain it in more detail.
Archon is offline   Reply With Quote
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:39 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.