KR issues at mid throttle, TC locked; New Scans 4-7 - Page 10 - 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 03-29-2006, 06:37 PM   #91
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

Ben,

Did you perform a CASE on the car after you installed the cam? Have you put race gas in it to see if your KR is eliminated or reduced?
Rogue is offline   Reply With Quote
Old 03-29-2006, 06:40 PM   #92
Senior Member
Posts like a Corvette
 
Join Date: Aug 2004
Location: South Bend, IN (hometown) Indianapolis,IN (college)
Posts: 1,598
Thanks: 0
Thanked 0 Times in 0 Posts
ELMACHOGERACHO is on a distinguished road
Default

Quote:
Originally Posted by Rogue
Ben,

Did you perform a CASE on the car after you installed the cam? Have you put race gas in it to see if your KR is eliminated or reduced?
i thought you didnt have to for a 97, or is that just for a pcm?
ELMACHOGERACHO is offline   Reply With Quote
Old 03-29-2006, 06:45 PM   #93
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

Quote:
Originally Posted by ELMACHOGERACHO
Quote:
Originally Posted by Rogue
Ben,

Did you perform a CASE on the car after you installed the cam? Have you put race gas in it to see if your KR is eliminated or reduced?
i thought you didnt have to for a 97, or is that just for a pcm?
You must always perform a CASE if you change the cam, crank/cam sensor, or PCM. The 97'* have a knock module that can be transfered from the old PCM to the new PCM but that does not guarantee that you won't have to do a CASE.
Rogue is offline   Reply With Quote
Old 03-29-2006, 06:48 PM   #94
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

Quote:
Originally Posted by Rogue
Ben,

Did you perform a CASE on the car after you installed the cam? Have you put race gas in it to see if your KR is eliminated or reduced?

No CASE learn was performed. The car fired up and ran just fine, no stumbles or anything. All seems to be fine other than when the torque converter locks.

I'm not running race gas, but the KR is there whether I'm using 91 or 93 octane. It has to be something related to the torque converter, because there is no KR until the TC locks in 3rd. You can drive in 1st, 2nd, or 3rd gear with the TC unlocked and get 0 KR, at any RPM. But when the TC locks and 'bogs' the engine down there are regularly 4-5 degrees of KR, with spikes as high as 10-12 degrees.

My AFC has me running rich everywhere in the powerband right now, so it'* not a fueling issue. LTFTs are consistently rich throughout all speeds and RPMs.

Todd, do you think this isn't a "flash KR" issue? Whatever it is, I want to make sure my trip to Ohio isn't in vain, ya know?


EDIT: Would a CASE learn help this situation? If yes, can you explain a little?
big_news_1 is offline   Reply With Quote
Old 03-29-2006, 07:01 PM   #95
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

KR is most likely to show up when the motor is under the greatest load, that would be 3rd or 4th with power applied and the TC locked up (as your mentioning). If your PCM does not know the crankshaft variation you could very well be asking for almost +6 degrees of more timing than you want and that could certainly result in KR especially on a higher compression motor.

Your first step should be to get a CASE learn done on the car. Your second step should be to scan the car when it is having the problem and log everything you can so we can take a look at whats happening.
Rogue is offline   Reply With Quote
Old 03-29-2006, 07:09 PM   #96
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

So aside from doing a CASE learn, do you think it'* alright for me to show up on the 14th with the car in current form? (i.e., should I be changing any parts or checking anything else?) Also, does that affect the time you would like me to show up at your shop?

And by the way Todd.... thank you for checking in here to make sure I'm doing things right. I appreciate it greatly.
big_news_1 is offline   Reply With Quote
Old 03-29-2006, 07:25 PM   #97
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

Well wouldn't you know it..... the dealership wants $75 for a simple CASE learn. I had a nice, polite conversation with one of the techs and explained that I was only looking for a 5 minute procedure... he was polite as well, but wouldn't budge on the price. I'll call a few other places.

Todd, if I can't get an affordable CASE done in my area, would it be alright to bring the car as-is on the 14th? Maybe budget a little extra time for scanning and dianosis, and have you guys do the CASE?
big_news_1 is offline   Reply With Quote
Old 03-30-2006, 08:58 AM   #98
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

Ben,

I'd like to make sure its a tuning issue and not soemthing more serious before making you drive all that way. Do you know anyone in the local gp club with an hptuners or dhp powertuner? I think they can do CASE learns....
Rogue is offline   Reply With Quote
Old 03-30-2006, 10:35 AM   #99
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jun 2004
Location: Glendale, AZ
Posts: 3,459
Thanks: 0
Thanked 1 Time in 1 Post
big_news_1 is on a distinguished road
Default

Yeah.... I thought of that right after my post last night, lol. I've got a local GP guy with a PowrTuner helping me, but now we've got an issue with the gear selector. Read about that issue here.
big_news_1 is offline   Reply With Quote
Old 03-30-2006, 11:04 AM   #100
Senior Member
Posts like a Corvette
 
Join Date: Jan 2004
Location: Montréal, QC
Posts: 1,374
Thanks: 0
Thanked 0 Times in 0 Posts
Foghorn is on a distinguished road
Default

Some good tips for you Ben from Todd. No doubt you're going to have to work through some of the possible causes in a methodical way in order to rule them out or identify them as the cause.

If you work with a DHP Powrtuner for the CASE Learn, you may have better success doing the proceedure in Neutral as opposed to Park.

Cheers,
Foghorn is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Mid-throttle hesitation 1994se 2000-2005 37 07-16-2007 11:04 PM
autozone Scans? 92_88_royale 1992-1999 7 06-27-2007 08:04 PM
Converter locked, add throttle = surging BonneMeMN 1992-1999 15 04-16-2007 06:11 PM
Throttle Body and Throttle body spacer! DeeGee96SE Performance, Brainstorming & Tuning 5 06-29-2004 01:21 AM
new interior picture scans SSEimatt93 Your Ride: GM Pictures & Videos 10 02-08-2004 06:28 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 11:41 PM.


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.