HELP! - Scan Results for L36 w/ cam, high compression - Page 2 - 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 11-29-2005, 11:25 PM   #11
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I don't think it will recover fully on it'* own. You're out of the limits of the PCM. Send me your raw data or a spreadsheet to william dot wren at gmail dot com

I'm suffering from some VERY similar symptoms after my top end work and have done alot of thinking, data collecting, and guessing. My mind is in the right frame for this one. I just need to jumble your data into some custom graphs to 'see' a trend or problem.
willwren is offline   Reply With Quote
Old 11-30-2005, 01:37 AM   #12
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

Email sent.
big_news_1 is offline   Reply With Quote
Old 11-30-2005, 01:42 AM   #13
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

NOW you send it. Ben, you PITA.

I've got it, but I'm crashing for the night. I'll take some time on HP'* dime (that rhymes) tomorrow and crunch some data. I'm looking for a pattern or trend, but the IA GP guys are probably on the right track.

It'* odd that the problem is only at the lower rpm'* though. That makes me think exhaust leak.
willwren is offline   Reply With Quote
Old 11-30-2005, 01:54 AM   #14
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

I'm with 98 TGP TOY on your fueling issue. And you should really get something to adjust the fueling on the fly. The mini-afc 2.0/1/2 is great for this in my opinion. Once you get your LTFT'* as close to zero as possible, you can give your afc values to a programer and eventually you can get rid of the mini-afc. I doubt any programmer would be able to nail the a/f teh first time around.
Another thing about the a/f. At idle, you should be running a little lean. This is due to the increased valve overlap. Fresh air will be pulled into the cylinder and some will actually make it into the exhaust. Once your O2 sees this, it thinks your running lean but your actually not. So a little lean at idle is ok (slightly positive LTFT'*) but everywhere else your LTFT'* should be close to zero.
Another thing 98 TGP TOY said is that it'* ok to but in the Intense pcm with the advanced timing but I think he said this because it wasn't mentioned that you milled your heads .040" in that thread.
95naSTA is offline   Reply With Quote
Old 11-30-2005, 01:22 PM   #15
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 willwren
It'* odd that the problem is only at the lower rpm'* though. That makes me think exhaust leak.
It'* interesting that you say this, because we thought we had an exhaust leak the first time we started it up. For the first few minutes the car was running, we could hear a very audible "tick" coming from the engine bay, seemingly from the rear of the engine. We were freaking out, because we thought the valvetrain components were a little off, but then we started looking at the rear exhaust manifold for leaks. Doug thought he saw a place where the welds on the exhaust flange weren't up to snuff, but I started the car while he was watching and he could see NO signs of an exhaust leak at that spot. We stopped worrying about it when the ticking went away a few minutes later. Doug thought it was merely a lifter that needed time to pump up, and we haven't heard the ticking since that first day.

So basically I had ruled out the possibility of exhaust issues. It seems that an extreme lean condition at part throttle would also be responsible for KR, wouldn't it? I'm looking into the possibility of a full-on dyno tune for this car, so maybe I'll be able to tell you whether fueling is enough to kill this KR. Keep coming at me with ideas, though! I definitely appreciate it!!
big_news_1 is offline   Reply With Quote
Old 11-30-2005, 02:14 PM   #16
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

Quote:
Originally Posted by big_news_1
It seems that an extreme lean condition at part throttle would also be responsible for KR, wouldn't it?
That'* what I'm thinking.
When you say full on dyno tune, what are you going to tune with?
95naSTA is offline   Reply With Quote
Old 11-30-2005, 02:39 PM   #17
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

Good question, Mike. Here'* the situation.

I spoke with a shop in Des Moines, IA called Midstate Machine. They have a chassis dyno, but it turns out they do NOT have tuning capability (the guy said I would have to go out of state to find a shop that can dyno tune the car ). However, they can provide me with a complete fuel curve for the car, along with the traditional horsepower and torque curves for $50. I'm not sure if a fuel curve would provide me with the data I need to get a proper tune from Intense. What do you guys think?



Edited for unnecessary whining
big_news_1 is offline   Reply With Quote
Old 11-30-2005, 03:55 PM   #18
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

Ben I really think that you shoud get a mini-afc 2.0+. You can use that to tune on the dyno. They are really not that hard to use and I could help explain it if you want.
95naSTA is offline   Reply With Quote
Old 11-30-2005, 04:10 PM   #19
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, that doesn't sound like a bad idea. Like the guys over at IACGP were saying, if I had an AFC I would be able to dial in the fuel trims, then take the numbers from the AFC and have them programmed into a PCM. I have been under the impression that it'* better to run a PCM with correct fuel tables than an AFC. Actually, I think I got this idea from Bill . Any thoughts?
big_news_1 is offline   Reply With Quote
Old 11-30-2005, 04:46 PM   #20
Senior Member
True Car Nut
 
95naSTA's Avatar
 
Join Date: Feb 2003
Location: Philly
Posts: 4,508
Thanks: 0
Thanked 0 Times in 0 Posts
95naSTA is on a distinguished road
Default

Quote:
Originally Posted by big_news_1
Yeah, that doesn't sound like a bad idea. Like the guys over at IACGP were saying, if I had an AFC I would be able to dial in the fuel trims, then take the numbers from the AFC and have them programmed into a PCM. I have been under the impression that it'* better to run a PCM with correct fuel tables than an AFC. Actually, I think I got this idea from Bill . Any thoughts?
I agree that it is better to run a pcm with the correct fuel tables. One of the reasons is that there are only 13 settings on the mini-afc 2.0 while a believe a fuel curve can be adjusted much more.
Another reason is that the maf sensor is one of the variables used to calculate up and down shifts at partial throttle. Changinging the maf percentage drastically will change when your partial throttle shift points are a little. This isn't really a big deal though and your settings have to be over 10% off to really notice)
And for 4T65 OBD2 cars, since the line pressure is controlled electronically, the shift firmness will also change if the maf percentage is off by over 10% or so.
BUT the the mini-afc is a nice tool since you can tune your car whenever you want, you can use it as a reference to tell your programmer how to change your a/f, and when your programmer is finished you can re-sell the afc.
An important thing to remember is that your a/f is pretty off and a programmer will not be able to nail it on the first try.
If you get a mini afc, you can be running safer in a shorter amount of time too. Instead of running on a dyno/or around in general with KR and then getting your pcm reprogrammed, and reprogrammed agian.
95naSTA is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
L36 Compression #'s ? 68w46 1992-1999 2 02-11-2007 01:39 AM
Compression test results 96bonneville 1992-1999 5 12-08-2006 05:52 PM
Increasing compression - Need scan help, please view! big_news_1 Performance, Brainstorming & Tuning 109 11-29-2005 03:00 PM
Compression Test Results/Question Daron97SSE 1992-1999 6 11-22-2005 03:17 PM
OBDII Scan Results.. Help.... MadSam 1992-1999 22 07-21-2005 11:32 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 04:36 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.