Starting issues when hotl..

[Carl83911]

hello,

Hello my friends,

Hopefully all is well and all the porsches are humming along on windy twisties.

I wish I could say the same for mine at the moment.

I have been having hot start isues. My starter (high torque) is fine. it cranks the motor but it doesn't fire up when the car is hot.

In the mornings and after work, it fires right up. only when I go for a drive the brings the temp up to normal operating temps is when it happens. I would go into a store and come out 10 minutes later and he car will not fire up.

If I wait about half and hour to an hour the car will start.

Please chime in the let me know what I may look for.

thanks in advance for your feedback.

Carl

[tevake]

Classic symptoms of a failed fuel accumulator. Not sure what else might cause the problem.

Cheers Richard

[DohertyCM]

Don't know what car you have or what type of carb system you have.
It could be a number of other simple things.
You need to provide more info...

[timmy2]

From your username an '83 with CIS?
Do you have a fuel pressure gauge? Need to know your fuel pressure bleed off time.
Your cold control pressure, warm running pressure, and system pressure.

If the residual pressure bleeds off quickly could be the FA or check valve.

[Joe Bob]

Also could be a check valve in the fuel pump.

You'll need gauges to look for fuel pressure drops.

[boyt911sc]

Carl,

You need a fuel pressure gauge to determine which of the following could be the culprit:
FP check valve
Fuel accumulator
FD primary return valve

Do not replace CIS component unless verified and tested to be defective. The fuel accumulator could be tested without using a pressure gauge.

Tony

[Carl83911]

thanks guys, sorry I didn't post the type
911 sc 83.

I'll just have to have my mech check it out. hopefully nothing too expensive.

[ossiblue]

I agree with the other posters that you may have a residual pressure loss--the most common issue--and that should be checked first. If you want further confirmation that pressure loss may be the issue, next time it happens, leave the ignition on, remove the air filter, gently lift the plunger inside the intake until you hear the injectors vibrate/squeal. Now, if the engine starts right up, you will know it's loss of pressure.

If the engine fails to start after doing the above check, your problem may be with the ignition.