: Shudder at low speeds, up inclines



r_casino
10-10-06, 12:25 PM
I know I've read about a few people having a shudder at low speeds especially on up hill roads -- in my case even on very minor up hill slopes.

I just started experiencing it on even the slightest up hill at low speeds. The SRX shudders -- not enough to shake the vehicle, but enough to know something is going on.

Anyone have any info on what the final outcome was?

b4z
10-10-06, 12:31 PM
Mine's in the shop for this right now.

Very slow acceleration from 30-45mph it will kind of stumble.

i suspect fuel injectors.

b4z
10-10-06, 06:11 PM
I will pick my car up tomorrow.
Thye said they did a reprogram or reflash of the transmission controller
and a reflash of prom which I thought had been done already.

I'll give you guys more detail tomorrow.

c5 rv
10-10-06, 08:40 PM
My SRX occasionally does the same when backing up my sloped driveway.

ckrichards
10-11-06, 01:28 PM
There was a post from someone, I do not remember who, indicating the same problem and there is a TSB out to replace the torque converter. They indicated the problem was solved, but then traded for a new DTS. I'm not sure how low of a speed is needed for the torque converter TSB to apply.
I would hope this only applies to earlier models. Cadillac should be installing the newer torque converters in the later SRXs.

b4z
10-11-06, 03:11 PM
Was it because the torque converter was locking and unlocking?

beekay
10-11-06, 06:44 PM
I have had the same issue since I bought it in 2004.

Test case: turn the wheel slightly to either side on an uphill and gently apply the gas. you will feel the car start to shudder even as you straighten out the wheel. it goes away when you accelerate hard out of this, but I have been able to get it to stay in this shuddering mode for about 1/2 mile or more. I thought it was somethign with the AWD and pavement.

It just started (like 10 minutes ago) leaking antifreeze, so It is off to the dealer for some work, I will add this to the list! thanks!
bk

b4z
10-11-06, 09:25 PM
Mine appears to be fixed.

Here is the invoice:
"Trans Control Module Software Update"
"Reprogram TCM"

beekay
10-12-06, 07:24 PM
Mine appears to be fixed.

Here is the invoice:
"Trans Control Module Software Update"
"Reprogram TCM"

B4Z, my dealer has not found that software update anywhere. he asked me for some model info to see if he can get more specifics:

1: last 8 numbers of your vin
2. What dealership did you get the work done at?

Thanks a ton for the help
bk

beekay
10-15-06, 05:34 PM
Dealer told me that it is likely that the shuddering is due to having the same size tires on front and rear. I got it to happen for the first time when I had the stock tires, but it has been a while since those things were around.

They have not yet found the software fix for the shuddering that B4Z has mentioned, so until he comes back to me with his dealer and vin info, I am on hold for the software fix.
bk

b4z
10-15-06, 07:53 PM
beekay,

Got your PM

Shuddering does not appear to be fixed.
Just got back from the mountains and while the car is dead smooth acclerating slowly on flat surfaces now, when I slowly accelerate up a hill it shuddered/stumbled a little bit.
This was around 30-40mph.
It may do it at lower speeds I don't know.
Since I live in the Lowcountry where everything is flat I may live with it for awhile.

So, sorry mine does not seem to be fixed.

I do know that it didn't do this when it was newer.

last 8:40156336
Miller Cadillac Mount Pleasant SC
843-884-5900

beekay
10-15-06, 10:55 PM
Thanks for the reply. Do you have all 4 tires the same size? Trying to determine if my dealer is FOS or not.
Appreciate the data. I will pass that along, though since you did not get your issue fixed, I think it is mute.

bk

b4z
10-16-06, 12:53 PM
The tires are the original 235 front/ 255 rear combo.
Different size tires wouldn't have anything to do with anything.
Unless you went much taller overall in the rear than original.

It sounds like a torque converter issue to me.
Almost like it is locking up completley when there should be some slippage.
You know, the engine is lugging because you are in a higher gear than it should be or the converter is so tight that the engine doesn't have enough torque or rpms to pull the load.

r_casino
10-16-06, 02:54 PM
There was a post from someone, I do not remember who, indicating the same problem and there is a TSB out to replace the torque converter.

Thanks for the info.

Found this document and it sounds like a possibility...

http://www.cadillacfaq.com/faq/tsb/data/pip3456c.pdf

beekay
10-16-06, 06:57 PM
R_casino thanks for the doc. i will send that to the dealer. RE tires: mine are all the same size and I also think it shouldn't really be an issue, but GM will lay claim to anything outside of Stock as the possible problem as the first conclusion.

bk

robhersch
10-17-06, 12:03 AM
I thought that with the new "E" trans, all shifting is computer controlled; I do not believe that the trans should have any "slippage" except when shifting from one gear to another (??). Would suggest that you pursue the software that monitors engine speed, engine load, etc to contol shifting vs torque converter and maybe also pursue engine fuel or spark control. good luck.

Bubba786
10-18-06, 12:46 PM
I had the exact same symptoms on my 2004 SRX, shudder at low speeds and on hills. Dealer determined that the torque converter was the problem. Had it changed last month and no more shudder.

beekay
10-19-06, 11:49 AM
Bubba786; are you running same size tires or the staggered setup?
bk

r_casino
10-20-06, 09:22 AM
Mine turned out to be the torque convertor, too. Dealer is replacing.

ckrichards
10-20-06, 07:27 PM
Thanks for the reply. Do you have all 4 tires the same size? Trying to determine if my dealer is FOS or not.
Appreciate the data. I will pass that along, though since you did not get your issue fixed, I think it is mute.

bk

You could ask your dealer if the new 2007 SRX's with 20" Wheel Sport package is covered under warranty. The package uses same wheels all around.

<<20" Wheel Sport Package, includes Performance Package, door sill plate cover, Sport grille, dual chrome exhaust tips, front and rear Sport fascias, chrome luggage rack, 20" polished aluminum wheels, P255/50R20 RS tires.>>


I would think the P255/50R20 RS tires have at least as much grip as the standard rear tires ( P255/55VR18 Michelins).
I don't understand what the warranty issue would be.

beekay
10-21-06, 06:46 PM
i am going to use that if they give me any crap. good point!
bk

BANK
10-24-06, 11:23 PM
News Flash

The original tires are all the same size, in diameter!

Some people and GM dealers especially, seem to fail to realize that the rolling diameters of the OEM tires are the same. Replacing these with the same size tires should not void any warrantee. Interestingly, the rolling diameter, and other dimensions, of tires are not standardized. A different brand will have different dimensions even though it is the same numerical size.

It just so happens that the 235/60/18 and 255/50/18 Michelins have the same rolling diameter. Other brands do not share this feature and in fact will have 0.10 inch or more differential in rolling diameter, as well as other dimensions, for the same numerical size as the OEM tires.

While I do not believe this is a significant difference, I can only guess that the whinny ass dealers may force you to buy the OME tires exclusively. Since I have replacement tires of the exact rolling diameter and numerical size when my dealer decides to void my warrantee can someone come over and help the service writer remove the tire iron from his ___. Thank you in advance and I’m sure the service writer thanks you also.

Oh yea, shudder since new. Seems to be when in third gear up an incline and sometimes when on the level. The trans upshifts on light throttle and it can start, not all the time. Sometimes it is very noticeable. My dealer is so stupid that I don't want to mention it.

It seems to be a play between load, low RPMs, and the motor/transmisson mounts and possibly the rear end. This appears to be a harmonic vibration. It has become noticably worse as time has gone by. Get it to down shift a gear manually or apply sufficient throttle to do so and it goes away.

The only fix would be to actually find what the harmonic issue is and add weight or dampen and/or to avoid the RPM/load that creates the situation. So the reprograming of the ECM or trans ECM could be the fix. It's to bad GM doesn't have the fix and the network to deal with it. Interestingly similar issues have been related to bad engine harmonic/pulley balancers. We'll just have to wait until the cars are 4/50k and have an independant shop fix it.

TSchnack
11-12-06, 01:39 PM
I had the exact same symptoms on my 2004 SRX, shudder at low speeds and on hills. Dealer determined that the torque converter was the problem. Had it changed last month and no more shudder.

Bubba786, could you send your dealer / service info. I need to take my 2004 V8 AWD in for this same exact problem. Thanks, Troy

TSchnack
11-12-06, 01:41 PM
Mine turned out to be the torque convertor, too. Dealer is replacing.

r_casino, could you post your dealer's info as well?

platinumsrx
11-14-06, 10:02 AM
Have been following this thread with interest as my 2005 AWD started exhibiting the shudder/stumble up inclines several days ago. Build date of May 2005 -- up to this point it has performed flawlessly. Hoping it is just a clogged injector. Anybody have any idea when the cutoff between the old and new torque converters was??? Will be putting a few miles on today, and if the problem persists, will stop at the dealer.

Scott

r_casino
11-14-06, 01:41 PM
Anybody have any idea when the cutoff between the old and new torque converters was??? Will be putting a few miles on today, and if the problem persists, will stop at the dealer.

I'm not sure there is an old vs. new?? The doc below indicates 2004 - 2006 may exhibit the behavior...

http://www.cadillacfaq.com/faq/tsb/data/pip3456c.pdf

Northern SRX
11-25-06, 09:13 AM
I've had this problem for a little over a year on my '04 SRX (now at 56k kms). Back in January, the dealership guessed that the solution was in the torque converter TSB so they replaced the TC. Problem reoccurred the next day. I had the vehicle in (sadly, for other things :helpless: ) 3 times in the following couple of months and each time reported the condition - they couldn't find or correct the problem.

Just yesterday, the dealership tried a reflash of the TCM (part K5364), having found a TSB that matched up with the symptoms I described (I wrote these down for them). In a nutshell, my shudder occurred on level roads, not on inclines - but that is probably because little of my driving involves inclines where the conditions would occur - and was most noticeable upon light acceleration shortly after a deceleration from about 80 km/h (~50 mph) to 60 km/h (~36 mph). The sensation felt like trying to start a car in too tall a gear. But if I opened the throttle, the tranny would downshift and the shudder would be avoided, so the shudder only occurred in light acceleration.

Like other posters here, I never noticed this condition for the first year I had the vehicle. OTOH, the low speed driveline clunk that I used to experience has gone away. My fear is that fixing this shudder condition will bring back the low speed driveline clunk. Even worse would be if the reflash is ineffective and I'm left with BOTH conditions :eek:

Here's hoping that the reflash works - I'll post an update in another week or so.

lbreitbarth
11-25-06, 11:18 AM
My 2005 V-8 AWD had this problem - it was the torque converter. Car was in the shop for several days. Runs fine now.

ramie
11-29-06, 02:32 AM
Took my 04 AWD V-8 back to the dealer I bought it from .(it's the second time I took it, also told them about TSB)They told me it was the tires that they are cupping. So I said well maybe they know whats going on:confused: (tires still had a lot of tread left).Well I bought a set of tires frt & rr (they are'nt cheap).Started driving home and guess what still had the problem.:mad: Dealer pissed me off because of their great knowledge .So I went to another dealer, Shirey Cadillac in Oak Lawn Il they found the problem Torque Converter, car drives great . Now I have a new dealer to do business with:bouncy: .

afg350ci
11-30-06, 09:38 AM
My '05 SRX V6 RWD shudders lightly sometimes when I slow down to a stop like at a light or stop sign. Also, sometimes I have to give the car gas when starting it because it turns over, shudders, then dies. I have to start again and hit the gas to make sure it stays on. I already took it to the dealer for an injector flush. Finally, this morning, when I got to work, I pulled into a space that had a slight incline, I put it in park but stayed in the car for minute listening to the end of a news broadcast. The car shuddered and just died. Do you think it could be a similar problem to what you guys are experiencing?