1975 911 warm start problem

jk911 · 04-29-2002, 05:31 PM

Hi all,

I am looking at buying a '75 911 targa, the car looks and runs well.
The only problem is starting, particularly when warm. Every time the owner wants to start it up he removes the air filter and pushes up on the intake throttle ?? a couple of times. you hear this whoosh sound and the car starts fine.

I plan to buy the car but I would like to know what is causing this problem first. I spoke to the posche mechanic and he said it sounds like the accumulator ? .

Has anyone else encountered this problem ??

Jim Sims · 04-29-2002, 06:11 PM

It could also be the fuel pump check valve, leaking fuel lines or leaking injectors - there is probably a leak somewhere that is causing the system pressure to be lost. Jim

jk911 · 04-29-2002, 06:12 PM

.

jk911 · 04-29-2002, 09:42 PM

wHEN YOU SAY "leaking fuel lines " TO WHAT EXTENT?

ARE " leaking injectors " HARD OR EXPENSIVE TO REPLACE ?

The person selling it currently has the car at the mechanic with the engine and transmission out of the car to change the tranmission bushings. What other minor non expensive things should i have replaced now that the engine is out. ??

Targa77 · Targa77's Garage

Injectors aren't hard to replace at all and they cost about $30.00/piece. Pull an injector and place it in a glass container with the fuel line still connected. Start the car and let it run for a minute. Now, turn the car off and watch the injector. Does it drip constantly. If it does, then you have a leaking injector and you'll lose fuel pressure over time. The accumulator cost more ($60.00 on this site) but since you're driving a 27 year-old car, I would replace this anyway while the engine is out. It mounts on the driver's side of the engine bay next to the fuel filter. This unit can cause warm-start problems. The check valve is located on the fuel pump and is very easy and cheap to replace. It's job is to keep fuel pressurized and to prevent fuel from back-flowing to the tank. You can do a search on this site for more info. The thing that concerns me is that if you push up on the valve in the air filter box, you're relieving fuel pressure as well. I don't understand how relieving fuel pressure will make the car start right up. It's almost as if you have some kind of blockage somewhere back to the fuel tank.