rdcarl

I have a 93 GTS - When the engine is cold it starts right up, but when it is warm it's a bitch to get it going. It just turns and turns. I've found that if I give it a little gas and keep cranking it will eventually start. Any advice would be greatly appreciated!

Automatic Trans.

Shane

Auto transmission or 5sp?

rdcarl

Automatic

Shane

Try this thread-->Hard start thread Some useful info there. HTH

bigs

My '93 AT GTS has the exact same problem.

When cold, even on the coldest morning, it starts up immediately. I don't even have to give it any gas. Just turn the key and it fires up.

But after running it for awhile, whenever I attempt to start up again, I've gotta pump the gas pedal a few times and give it lots of gas.

After starting, either cold or hot, it runs just fine.

I checked the above suggested thread and found some interesting info, but I'm not sure there was a final "problem-is-resolved" post listing what the final solution was.

Shane

Sure he said-->

bigs

Hmmm...

I understood the coil wire issue to be a secondary issue that arose after he did a tune-up, but was not the original problem. Maybe I misunderstood.

And the new fuel pump relay seemed to keep his car from dying, but I don't think rdcarl's car or mine have any issue with dying once they get started.

WER

bigs, I don't think the problem is isolated to the GTS, my 84 S does the same thing... It catches on the first bump of the key when cold, but once it warms up to normal it takes a touch on the accelerator to start, otherwise it just keeps turning over. Since it starts immediatly when cold, that seems to indicate the fuel pressure isn't leaking down which tells me that that the fuel pump, pressure regulator, relay, etc. are working as they should. My thought is that the cold start is still working when hot, causing an overly rich mixture needing the extra air from the cracked throttle to start. Just haven't gotten around to checking that yet.

Jim bailey - 928 International

With a fuel injected car like the 928 depressing the pedal and pumping the pedal does NOT add more fuel. As mentioned it lets in more air if you have the pedal somewhat depressed while cranking. The 1978-1984 USA cars have a ninth cold start injector BUT 1985 > only use 8 injectors. Engine temperature sensors are supposed to know when the engine is cold and the LH computer adjusts the mixture to be rich.

bigs

Thanks, Jim. Very interesting.

So, if the computer knows when the engine is cold and adjusts the mixture to be more on the rich side, does it also adjust the mixture more to the lean side when the engine is hot, or does the driver simply have to depress the pedal to "mix his own?"

In other words, is this a normal phenomenon?

Jim bailey - 928 International

Bigs it is not the way the car is supposed to act. When the senior management of Porsche drove 928s as company cars I believe the cars would hot start just fine As far as WHY some L H injected cars do have hot start problems ?? It might be worth while to download the fault codes from your LH brain. The 93 GTS that I recently put about 1,000 miles on would hot start just fine.

jetrainor

I have had the same problem with my 87 auto.....starts first touch when cold but is a bear when warm....the only way it will start warm is to depress the gas pedal and when it finally catches a great belch of dark unburned fuel smoke blasts out the back. I've been thinking its the temp 11 sensor sending incorrect info to the brain.
John
87 euro auto
silver/black

Beth

I had the exact same problem with my '87. In my case it was the fuel pump relay.