911 porsche is shaking when driving

brents42gpw · 04-02-2009, 08:38 PM

first off. my car is a 74 911 with a 2200 T engine and tranny. I have driven it a few times. but when i first start off it will shake as I am driving it. I just changed gaskets and the oil and filter. but not a fuel filter. got one from pelican but have not installed yet. tonight it shook harder then before. do I have a fuel pump going out. or is it a fuel filter? I did some research on the wur system. but mine does not have that. mine is a carburated T engine. any thought would be greatly appreciated. thanks

brent

Flieger · Flieger's Garage

Check clutch cable adjustment. That is a common reason for "clutch shudder". It could also be a leaky guide tube seal in the transmission or the rear main seal on the engine. Any oil getting onto the friction surface of the clutch/flywheel can cause a grabby engagement.

And welcome, Please post photos of your car.

steely · 04-03-2009, 04:31 AM

Hi Brent, I'm thinking clutch too. Does it shudder while cruising or when starting out? How many miles on the car / clutch?

brents42gpw · 04-03-2009, 07:07 AM

the shutter happens when I first take off. and I didn't notice it all the last time out. but yesterday it really shook. I don't have any oil leaking near the clutch that I can see. lots of hidden parts there. I don't know how many miles on the clutch since I just got this. 77k on the car. I have posted pics. will see if I have some new pics of the car. thanks gents

brent

brents42gpw · 04-03-2009, 07:11 AM

here are a couple pics of my new toy

brent

Zeke · 04-03-2009, 07:54 AM

Just to be sure, you car shakes when you drive off from a standstill, right? That does sound like a clutch. Try a start in 2nd. If it shakes less, I'd vote clutch.

But, I'm just wondering since you didn't say, does this happen all the time or just when the engine is cold? Some have discovered that bad spark plug wires can do something similar to what you describe.

I doubt if it's fuel related at this point but carbs have to have a correct float bowl adjustment. You didn't say anything about popping, so that's probably not worth looking into now.

brents42gpw · 04-03-2009, 08:51 AM

yesterday it was doing the shaking in second. I never considered it to be a clutch so I didn't play that much. actually if It were the clutch couldn't I just put the clutch in while I was say in 3rd gear? then it shouldn't shake? it was very intermittent. but I mostly notice it when the car is cold and when I first take off in first. I had it in 4th and 5th gear on a ride yesterday and there was no shakes at all. nothing.. there is no popping for back firing. so I hope the carb is ok. I am going to order spark plugs. since the cap and rotor is all new. I never thought of spark plugs. I will order some.. this is a great website. I appreciate your imput. thanks

brent frank

911st · 04-03-2009, 09:20 AM

Shounds like you are saying is it not the clutch.

Dose it shake on acceleration, cruse, de-acceleration?

I know this is a long shot, have you checked you lug nuts? That is the only time any of my Porsche's ever shook.

Zeke · 04-03-2009, 11:07 AM

Then I'd look at the plug wires with the engine running at night in the dark.

steely · 04-03-2009, 08:21 PM

+1 on the tires - and do what Milt sez to see if you have major power loss due to the plug lines arcing. If the car has 77K, I vote clutch is original. Some had a rubber center even, find any rubber bits under the car? Can you tell if the RPMs are even during these episodes? Can you try rolling from a stand still to ensure it's not the suspension/wheels/brakes whatever? Maybe jack it up and check each wheel one at a time?

Nice! car by the way - it looks great. We want to see the engine. :-) good luck

Trog · Trog's Garage

Make sure your handbrake is completely released. If the rear brakes are applied for an excessive period of time, the rotors will heat and warp and result in the shake you're describing... don't ask how I know.

brents42gpw · 04-04-2009, 08:36 PM

I am going to take it out and try what you all said tomorrow morning. a quick question on jacking the car up. the original jack in the car is confusing. I am retarted I know. what is the best place to jack the car in the rear. on the a arms near the wheel areas? also do I need a very small jack? my floor jack is too tall to get under there. this engine is a t engine. so the car is a s car. so I dond't know if the clutches are the same or not. but I will try the other things you all have suggested. thanks
brent

bill romero · 04-04-2009, 09:55 PM

I had "the shakes" as well. I mounted new tires, balance & alignment. Ran smooth after that. The tires I had looked good but were very old. New tires fixed it for me. Good luck.

barney911rs · barney911rs's Garage

Who put a 2.2T engine in 74? What transmission? The car would of had a 915, but I believe that motor would of been mated to a 901 originally.

DasBoot · 04-04-2009, 10:30 PM

Quote:

Originally Posted by brents42gpw

this engine is a t engine. so the car is a s car.

Not sure I follow.

Zeke · 04-05-2009, 07:17 AM

Quote:

Originally Posted by DasBoot

Not sure I follow.

We try, huh.

DasBoot · 04-05-2009, 07:42 AM

Quote:

Originally Posted by milt

We try, huh.

Having a "T" motor makes the car an "S"?

Zeke · 04-05-2009, 07:49 AM

To my knowledge, in '74 you could buy a 911, a 911S or a Carrera. I guess he has the S body but lost the 2.7 CIS motor. So, it could be a 2.2/901 or a 2.2/915 conversion. You just have to change the flywheel. The 2.2 case would accommodate a 225mm set up.

I don't think there will be a rubber centered disc in there.

JFairman · 04-05-2009, 07:51 AM

sounds like you recently bought this car.
have you tried asking the person you bought it from why it shakes?

it might have collision damage, a used up motor mount, a bubble on a tire, or if it's just the motor running rough, a tune up.

DasBoot · 04-05-2009, 07:54 AM

Quote:

Originally Posted by milt

To my knowledge, in '74 you could buy a 911, a 911S or a Carrera. I guess he has the S body but lost the 2.7 CIS motor. So, it could be a 2.2/901 or a 2.2/915 conversion. You just have to change the flywheel. The 2.2 case would accommodate a 225mm set up.

I don't think there will be a rubber centered disc in there.

Ahh, OK.

So, correcting the OP's "Engrish/grammer", I come up with:

"My car is a 1974 911S model with an earlier T motor installed..."

Got it, thanks.