Help me Diagnose my saabs shudder issue.

The_Finn · September 1st, 2008, 11:01 PM

so my Saab is having a shuddering issue while driving on the highway.

The car:
1996 saab 900s 2.3L non-turbo with an automatic transmission

facts i have:

happens around 65-75mph
happens only under load from the engine. i have to be accelerating for it to shudder if i let off the gas i glide along smooth hell if i am light on the gas to maintain speed it won't shudder
I recently got one of my tires patched (need to buy new ones this comming weekend when i get paid)
i shudder less if am turning slighty right (the tire i had patched was on the right)

all things point to it being directly related to the tire being patched but i don't see how that can account for the only shudder while under acceleraton thing...

anyway i am stumped what are your thoughts on the issue

Spectre · September 1st, 2008, 11:25 PM

Did you get the tire/wheel assembly rebalanced after patching?

I've seen weird stuff with unbalanced rotating assemblies, including your problem.

cvrefugee · September 2nd, 2008, 12:13 AM

Sounds like a real Saab story.

The_Finn · September 2nd, 2008, 12:15 AM

i can't believe you said that

watto · September 2nd, 2008, 01:37 AM

Quote:

Originally Posted by Spectre

Did you get the tire/wheel assembly rebalanced after patching?

I've seen weird stuff with unbalanced rotating assemblies, including your problem.

I'd second that. Last time I got new tyres the shop didn't balance my wheels correctly and I had shuddering from the front, only when under acceleration and at 'highway cruising speeds'...

NooDle · September 2nd, 2008, 09:15 AM

yup, it must be some balancing issue with the wheels/tyres.

The_Finn · September 2nd, 2008, 04:15 PM

Quote:

Originally Posted by Spectre

Did you get the tire/wheel assembly rebalanced after patching?

I've seen weird stuff with unbalanced rotating assemblies, including your problem.

Quote:

Originally Posted by watto

I'd second that. Last time I got new tyres the shop didn't balance my wheels correctly and I had shuddering from the front, only when under acceleration and at 'highway cruising speeds'...

Quote:

Originally Posted by NooDle

yup, it must be some balancing issue with the wheels/tyres.

right then i will suffer with it (yay 60mph on the highway) till i get my new tires on friday and make sure those are properly ballanced

Susurrate · September 2nd, 2008, 05:19 PM

Quote:

Originally Posted by The_Finn

so my Saab is having a shuddering issue while driving on the highway.

The car:
1996 saab 900s 2.3L non-turbo with an automatic transmission

facts i have:

happens around 65-75mph
happens only under load from the engine. i have to be accelerating for it to shudder if i let off the gas i glide along smooth hell if i am light on the gas to maintain speed it won't shudder
I recently got one of my tires patched (need to buy new ones this comming weekend when i get paid)
i shudder less if am turning slighty right (the tire i had patched was on the right)

all things point to it being directly related to the tire being patched but i don't see how that can account for the only shudder while under acceleraton thing...

anyway i am stumped what are your thoughts on the issue

My sister had the exact same car and similar problem. Under moderate acceleration the transmission would shudder shifting from first to second, it turned out to be a busted transmission mount.

The_Finn · September 2nd, 2008, 11:34 PM

Quote:

Originally Posted by Susurrate

My sister had the exact same car and similar problem. Under moderate acceleration the transmission would shudder shifting from first to second, it turned out to be a busted transmission mount.

it doesn't happen while shifting it happens while at a constant speed in i assume 4th

September 1st, 2008, 11:01 PM	#1
The_Finn Joined: Feb 7th, 2005 Last Online: 04:45 AM Location: Worcestersheshershire MA Age: 27 Posts: 2,395 Car: 1988 Mazda 323 GTX / 1997 Saab 900s Rep Power: 31	Help me Diagnose my saabs shudder issue. so my Saab is having a shuddering issue while driving on the highway. The car: 1996 saab 900s 2.3L non-turbo with an automatic transmission facts i have: happens around 65-75mph happens only under load from the engine. i have to be accelerating for it to shudder if i let off the gas i glide along smooth hell if i am light on the gas to maintain speed it won't shudder I recently got one of my tires patched (need to buy new ones this comming weekend when i get paid) i shudder less if am turning slighty right (the tire i had patched was on the right) all things point to it being directly related to the tire being patched but i don't see how that can account for the only shudder while under acceleraton thing... anyway i am stumped what are your thoughts on the issue __________________ Proud owner of a 1988 mazda 323 GTX: The ~~poor~~ rich mans evo... “Auto racing, bull fighting, and mountain climbing are the only real sports ... all others are games.” ~Ernest Hemingway~ It's all about having the right priorities. You can sleep in your car but you can't race your house -\|- Basically i go accurately and on special lines

September 1st, 2008, 11:25 PM	#2
Spectre Joined: Feb 1st, 2007 Last Online: 08:28 AM Location: Dallas, Texas USA Age: 31 Posts: 3,009 Car: 87 XJ6, 95 XJR, 90 WD21, 86 CB700SC Rep Power: 52	Did you get the tire/wheel assembly rebalanced after patching? I've seen weird stuff with unbalanced rotating assemblies, including your problem. __________________ 1986 Honda Nighthawk 700S (project, light restoration in progress) 1987 Jaguar XJ6 Series III Vanden Plas (modified) 1990 Nissan (WD21) Pathfinder SE 4x4 (little red offroad commuter box) 1995 Jaguar (X300) XJR (modified) My truck can swim the English Channel; what can yours do? It's just another day / Where people cling to light / To drive away the fear / That comes with every night

September 2nd, 2008, 12:15 AM	#4
The_Finn Joined: Feb 7th, 2005 Last Online: 04:45 AM Location: Worcestersheshershire MA Age: 27 Posts: 2,395 Car: 1988 Mazda 323 GTX / 1997 Saab 900s Rep Power: 31	i can't believe you said that __________________ Proud owner of a 1988 mazda 323 GTX: The ~~poor~~ rich mans evo... “Auto racing, bull fighting, and mountain climbing are the only real sports ... all others are games.” ~Ernest Hemingway~ It's all about having the right priorities. You can sleep in your car but you can't race your house -\|- Basically i go accurately and on special lines

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September 2nd, 2008, 12:13 AM	#3
cvrefugee Joined: Aug 16th, 2004 Last Online: 12:57 AM Location: Corona, CA Age: 28 Posts: 3,399 Car: 2005 Scion xB Rep Power: 58	Sounds like a real Saab story.

September 2nd, 2008, 09:15 AM	#6
NooDle Joined: Jul 20th, 2005 Last Online: 08:36 AM Location: Belgium Age: 27 Posts: 2,631 Car: 2004 Opel Astra 2.2DTI Rep Power: 37	yup, it must be some balancing issue with the wheels/tyres.

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