Very strange KR - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 11-19-2010, 11:58 AM   #1
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default Very strange KR

I noticed after I calibrated my PCM to use the 2Bar MAP sensor from the 1Bar that I got some KR. I'm not sure if this was merely coincidence or if its actually KR.

This morning on my way to work I decided to scan. I had the factory tables for the 2005 GTP on there. Keep in mind that its irrelevant which table I'm using as the location on the spark map where I got some KR was virtually the same between a 2000 GTP and 2005 GTP.

I noticed this was under 53% throttle. Engine temp 107 degrees, air intake temp 37 degrees. Certainly not KR inducing conditions. O2 was reading 980mv, which is way on the rich side. I was going 27mph when I gradually accelerated, keeping the car in a low gear. I did not go wide open throttle, only 53% throttle, yet got 7.8 degrees of KR!!!

Now, upon acceleration from a stop, I've noticed some vibration which I suspect is a bad engine mount. I'm going to be replacing that soon, but for those of you who have some tuning experience, is it at all normal to get that kind of KR under those conditions? Or is it more likely that its false KR...

After that KR reading, I went wide open throttle about another 5 times from a dead stop and got absolutely no KR in the higher airmass values of the table. It was only at half throttle that I got that KR reading...
xtremerevolution is offline   Reply With Quote
Old 11-19-2010, 12:07 PM   #2
Senior Member
True Car Nut
 
Jonpro03's Avatar
 
Join Date: Jul 2010
Location: Danville, Illinois
Posts: 2,469
Thanks: 0
Thanked 0 Times in 0 Posts
Jonpro03 is on a distinguished road
Default

That sounds right actually. There is a lot more load put on the motor when accelerating at a low rpm. You would've noticed that KR disappear if the car had downshifted.

The only time I get KR on my GTP is when I first hit second gear (rpm drop) at WOT.
Jonpro03 is offline   Reply With Quote
Old 11-19-2010, 12:11 PM   #3
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by Jonpro03 View Post
That sounds right actually. There is a lot more load put on the motor when accelerating at a low rpm. You would've noticed that KR disappear if the car had downshifted.

The only time I get KR on my GTP is when I first hit second gear (rpm drop) at WOT.
So I should just drop timing under load at those specific cells and go from there? It doesn't bother me absolutely at all since I'm rarely in that range and when I am, I don't care. WOT KR is non existent even with 4 degrees of spark advance over what I had in the cells when I got KR. I'll try lowering it by 2 degrees and go out and scan again.

Still feels strange though that these were with the stock tables.
xtremerevolution is offline   Reply With Quote
Old 11-19-2010, 12:26 PM   #4
Senior Member
True Car Nut
 
Jonpro03's Avatar
 
Join Date: Jul 2010
Location: Danville, Illinois
Posts: 2,469
Thanks: 0
Thanked 0 Times in 0 Posts
Jonpro03 is on a distinguished road
Default

I would still consider it cruising anyway so ya, pull some timing. You just want the car to be fast when you go WOT. Everything else can be economy as far as I'm concerned.
Jonpro03 is offline   Reply With Quote
Old 11-19-2010, 01:19 PM   #5
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Make sure nothign it touching like your exhaust, or a bad motor mount. Can you post you a image of your scan when the KR shows up?
Danthurs is offline   Reply With Quote
Old 11-19-2010, 01:35 PM   #6
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

I'll get that up when I get home tonight.
xtremerevolution is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Really, I'm not dead, just very very busy. Danthurs Lounge 7 08-31-2012 09:54 AM
2000 Buick PA gear selecter very very stiff Toddster Buick 11 01-27-2010 11:00 AM
Very very funny illustrations wjcollier07 Lounge 0 02-19-2007 02:16 AM
Serious, but very strange problem - Need pros on this one! toxictelevision 1992-1999 7 05-11-2006 04:45 PM
Backed by popular demand (56K be affraid, very very affraid) Findlay GTP Your Ride: GM Pictures & Videos 24 11-01-2003 06:44 PM


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 03:52 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.