911 T Power Delivery

[MikeS]

I just purchased a 73T. I noticed when test driving a slight hesitation when the engine was working hard - particularly when accelerating up hill. I had the car checked and my mechanic said the timing was not set correctly. I just had the timing adjusted and still notice the hesitation. Are there any other potential causes for this?

[tight as a bull's ass]

Originally posted by MikeS
I just purchased a 73T. I noticed when test driving a slight hesitation when the engine was working hard - particularly when accelerating up hill. I had the car checked and my mechanic said the timing was not set correctly. I just had the timing adjusted and still notice the hesitation. Are there any other potential causes for this?

A couple things:

1. get your mechanic to admit he misdiagnosed your problem.

2. ask for your money back.

3. go to another mechanic who can fix your problem.

[jkeyzer]

Is it MFI or CIS (73 or 73.5?)

Could be a lot of things. I think Warren will probably chime in with his collection of common distributor problems - search the archives first.

Ignition, fuel delivery... most likely one of those somewhere.

Since you are a new owner it's hard to know how recently the car had a tuneup including plugs, wires, rotor, cap, points, and valves adjusted. Make sure your mechanic timed it correctly, the method varies depending on the model.

[jluetjen]

I just want to add an emphisis to what Jkeyzer said...

>>> IGNITION<<<, fuel delivery etc.

My experience is that most mis-fires that I've encountered under load are ignition related. The engine can accept a fairly wide variety of fuel conditions (rich, lean etc) and keep running. It will be down on power, but it will keep running. But if they ignition fails to fire in one cylinder while under load, you will feel it. Bosch also says something to affect of "Start with the ignition" in many of their manuals.

First I'd go over distributor rotor and cap, spark plug wires and distributor wire and spark plugs real carefully -- before I'd start messing around with the FI. Also make sure that the area around the spark plugs is clean. If you get a build-up of gunk in there it could cause a high-resistance short that only becomes an issue when the pressures in the cylinders goes up from the load. I'd recommend getting a tube of dielectric grease from your local auto parts store and make sure that there is some in each spark plug wire boot. It helps to prevent shorts down the outside of the spark plugs, which can happen with high voltage ignition systems.

I'll yield the floor to Warren...

[Sunroof]

I own a 1973.5 T with CIS and have had the same problem and then some. I went through a battery of tests and changes to finally get my T running peak only to suffer now from a rusting tank and dirty fuel. I suggest you check the point gap first. Believe it or not the owners manual shows how do it all as well as Haynes and Waynes 101 Project Book. If the gap is off, at high speed and under load the car will miss and it will slap you in the back! I hate when that happens!

In the technical notes section here at Pelican, down load the CIS trouble shooting chart, thats good to keep onboard and will help in diagnosing fuel problems. Try a bottle of Techron next time you fill up. Let the tank get down to 1/8th, pour in the techron and fill to 1/2 with 93 octane. If you just got the car and not sure of the fuel system condition, do it back to back. Just drive and let the stuff clean the injectors. Porsche says, change your oil within 500 miles as it does thin out the oil. The stuff is great.

By the way, I have an extra 1973 911 T, E, S owners manual for sale if your interested.

Good Luck
Bob

73.5 T

[MikeS]

Thanks so much for the suggestions guys. I appreciate your interest and help. Hopefully Ill be able to take care of this in short order - as I love driving the car! Bob- I've got the original manual , which is surprisingly quite detailed. I was also thinking about purchasing a Haynes manual - as I found this a great resource for working on my 71 240Z (many years ago!).

Regards-
Mike

[Sunroof]

Mike.
Definitely a Haynes Manual and I highly suggest Waynes new "101 911 Projects". With these two, your pretty well equiped. Toss in the fantastic "technical notes" on Pelican and this website and your set. I haved saved a bundle of $$$$$$ coming to this site and seeking help, and its always nice passing on information to other owners. The "T" is a great little car and that 2.4 is a great performer.

Drive safe
Regards

Bob
73.5 T

[david c.]

Hey guys,

I have a chance to purchase what we collectively determined to be a 73 "T", #1418 -ROW.

Anyway, the car is sitting right now and is a total mess. It has:

no fenders, doors, hood, seats, paint, front window, etc. It hasn't been driven, in my estimation, in about ten years.

Good points: it has the 2.4 engine (apparently with MFI) and tranny and three Fuchs wheels. The pans seem okay upon cursory inspection. The engine seems pretty much intact with all accessories.

I have two options assuming the seller can get the title (another issue altogether):

1. $200 for the car as is,
2. $2000 for the car and OEM Porsche hood, doors and fenders.

I have no idea what I'll do with the car, but the condition doesn't seem to justify the additional cost of the factory, new in box body panels.

Any thoughts?

Dave

PS: Oh yeah, I have the space to let it sit for a long period of time and stare at it. This make buying it without a goal more plausible.