Scantool data- can anybody look over this for me? TCC? - 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.

Thread Tools Search this Thread
Old 08-20-2003, 09:51 AM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
Join Date: Oct 2002
Location: Watertown, Wisconsin
Posts: 103
Thanks: 0
Thanked 0 Times in 0 Posts
Daron97SSE is on a distinguished road
Default Scantool data- can anybody look over this for me? TCC?


I have had some surging problem since I got my car (97 SSE 82k miles).

I've tried different things, some things have been replaced:
Alternator, battery, plugs, wires (twice), had injectors/fuel sys cleaned, fuel
pump replaced, air filter, trans fluid and filter.

1) Car shudders when running for a little bit, or on hotter days.
2) Shudders around two to three, or three to four gears.
3) You'lll be lightly pressing the gas pedal down to accelerate, and thats when
it starts surging. The tach goes up and down in like increments of 100 or 200 RPMs, but does not shift.
4) If you floor it, it'll shift and accelerate fine.
5) The longer you drive it while it'* doing this, the worse it gets, the more often it does it, and soon it'* undriveable really on the highway (above 50mph). I've had to shift it to 2nd once to drive a stretch home.

My friend and I used a AutoScan OBD II Scantool to retrieve some info, and we are not not mechanics, but after looking at what I found, I think my problem is the TCC itself, or somewhere in there- but, can somebody confirm/or reply to my results?

1) On a cold start, we found initially the engine ran either richer or leaner (can't remember which one was which), but shortly it went the opposite direction. I am assuming this is normal operations.

2) Engine RPMs weren't solid, they did very but never went greater then 75 RPMs higher or lower then the "Desired Engine RPMs" or whatever on the tool.

3) TCC Slip ranged greatly, but varied around 87% many times.

4) Engine temp/trans temp volts were both OK.

5) Occasional slight knock under load or hills. I believe this is normal.

6) Oh, there were NO codes this entire time.

OK, so finally after a while, it started shuddering:

1) Engine RPMs were more varied and fluctuated.

2) Knock jumped up to at one point a max of 14.7

3) TCC Slip was at 0%... during times that it would shudder. As soon as I floored it, it would shift and TCC would return to like 80% slip. If it'* at Zero, I'm assuming it'* locked. It was also locked at OD as well.

4) Engine temp was OK, trans temp volts were even lower then before actually.

Since it unlocks when I floor it, that would lead me to believe the TPS is working OK. Since it unlocks at all also, that would also lead me to believe that the TCC Solendoid is OK.
I don't know about any other of the systems that the TCC is reliant on.

Somebody please let me know about these results, thank you so much!

Am I on the right track?

Daron97SSE is offline   Reply With Quote
Old 08-20-2003, 05:42 PM   #2
Posts like a V-Tak
Join Date: Jul 2003
Location: toronto
Posts: 99
Thanks: 0
Thanked 0 Times in 0 Posts
bonneville1992 is on a distinguished road

I had the same problem with my car, your best bet is to take it to a tranny shop, my surging was created by a problem in the valve body, it was updated and now the car is fine. i"m not sure what the cost is, i had it done under waranty. Tranny only has 25,000klm. good luck. I tried a full tune up including performance coils before i took it to the trans shop. anyhow i hope you get it fixed, it drove me nuts.
bonneville1992 is offline   Reply With Quote
Old 09-04-2003, 07:58 PM   #3
Senior Member
Posts like a Corvette
Join Date: Jul 2003
Location: Ardmore, Oklahoma
Posts: 1,590
Thanks: 0
Thanked 0 Times in 0 Posts
big_boss2010 is on a distinguished road
Default Surging

I had a problem similar to this you should try the coil packs or if this doesn't fix the problem get the tranny rebuilt.
big_boss2010 is offline   Reply With Quote
Old 09-04-2003, 08:17 PM   #4
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

Somewhere between the coil packs and the plugs. That'* my best guess. Pull your plugs and inspect them. I bet you'll find fouling from misfiring.
willwren is offline   Reply With Quote
Old 09-04-2003, 08:47 PM   #5
Posts: n/a

what you have is a torque converter shutter. usually this is caused by a dirty passage way in the valve body going to the torque converter lock up solenoid. take it to a trans shop or a good repair shop that has a transmission flush machine.this machine will flush the entire transmission. including the converter. mine had the same shutter when the tcc was locked. i used our unit at work and it was gone. these machines will change aprox. 99% of the fluid inside the transmission. defintly well worth the money to have it done, it will take about 19-20 quarts of fluid to do the flush. the cost is usually around 80-100 bux.
this is the first thing i would try to get rid of the shutter.
  Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
TCC problem p0742 tcc stuck in locked position San Juan Cruiser 2000-2005 8 10-20-2007 01:00 PM
Scantool data ranges in techinfo Lowrider0308 Forum updates and suggestions 2 04-04-2007 09:26 AM
Scantool Analysis... Anybody? Daron97SSE 1992-1999 5 10-20-2005 02:47 PM
So... Who can diagnose by scantool freeze frames? Damemorder 1992-1999 14 10-07-2004 01:08 AM
Scantool Ownership Update--Reply only if you have a Scantool 95BonnevilleSESC Lounge 14 01-29-2004 09:18 AM

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 03:21 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 and affiliated sites.